Dental Ceramics Most Important MCQs

1 - 1st formed dental tissue______________?

A. Enamel

B. Dentin

C. Cementum

D. Bone

Dentin

2 - A suitable fixative for a routine biopsy specimen is_____________?

A. 10% formalin

B. 40% formalin

C. 20% formalin

D. 10% alcohol

10% formalin

3 - A supernumerary tooth results from a deviation during_____________?

A. Initiation

B. Differentiation

C. Apposition

D. Calcification

Initiation

4 - About zinc oxide eugenol all are true except_______________?

A. ZnO is converted to Zn(OH)2

B. Reaction is autocatalytic

C. Water is the byproduct of reaction

D. Dehydrated ZnO reacts with dehydrated eugenol

Dehydrated ZnO reacts with dehydrated eugenol

5 - Accentuated incremental lines in dentin are______________?

A. Incremental lines of retzius

B. Incremental lines of von Ebner

C. Contour lines lines of owen

D. None of the above

Contour lines lines of owen

6 - Accentuated incremental lines in dentin due to disturbances in matrix and mineralization process is_____________?

A. Incremental lines of retzius

B. Incremental lines of vonebner

C. Contour lines of owen

D. None of the above

Contour lines of owen

7 - Accessory canals result from____________?

A. Defects in cementogenesis

B. Dividing epithelial bridges

C. Break in Hertwig's root sheath

D. Adherent epithelial rests

Break in Hertwig's root sheath

8 - Acellular cementum is typically found in_____________?

A. Coronal half of root

B. Apical half of root

C. Apex of root

D. Entire root

Coronal half of root

9 - Advantage of zinc phosphate over GIC is______________?

A. High compressive strength

B. Tensile strength

C. High modulus of elasticity

D. Diametral strength

High modulus of elasticity

10 - Age hardening is a process done at______________?

A. Heating up to 200 – 450°C for 15 – 30 min and quenching in water

B. Heating at 700°C for 10 – 15 min and quenching in water

C. Heating at 700°C for 1 hour and quenching in water

D. Heating above 700°C for 30 min and quenching in water

Heating up to 200 – 450°C for 15 – 30 min and quenching in water

11 - All factors govering dentine permeability EXCEPT_______________?

A. Smear layer

B. Fluid convection

C. Length of dentinal tubules

D. Diffusion coefficient

Fluid convection

12 - All of the following are true for traditional solution liner, except_________________?

A. It is not necessary in moderately deep cavities under glass ionomer restoration

B. Have Film thickness of 1 – 50 microns

C. Do not provide thermal or electric insulation

D. Protect the pulp from reaction products leaching out of restoration

Have Film thickness of 1 – 50 microns

13 - All of the following is true about dentinal tubules except______________?

A. Inner pulpal layer contains more dentinal tubules than outer dentin layer

B. The diameter of dentin tubules ranges from 5 to 7μm

C. The diameter of dentinal tubule is more at pulpal layer than outer layer

D. The bonding is more on the inner layer of dentin compared to outer surface

The diameter of dentin tubules ranges from 5 to 7μm

14 - All of the following is used as accelerator in zinc oxide eugenol cement except_____________?

A. Acetic acid

B. Zinc acetate dehydrate

C. Calcium chloride

D. Bromoglycerine

Bromoglycerine

15 - All of the following is used as accelerator in zinc oxide eugenol cement except_______________?

A. Acetic acid

B. Zinc acetate dehydrate

C. Calcium chloride

D. Bromoglycerine

Bromoglycerine

16 - All of the following statements are true for zinc oxide eugenol cements except______________?

A. Equal lengths of base paste and accelerator paste are mixed together until the mix has a uniform colour

B. The mix appear thick at the start of mixing but after 30 seconds of additional spatulation it becomes more fluid

C. Water accelerates but heat retards the setting of zinc oxide eugenol cements

D. Both B & C

Both B & C

17 - Among the difference between teeth in the decidous and the permanent dentition is that_____________?

A. Buccal surfaces of the permanent molars are flatter

B. Cervical ridges are more pronounced in permanent molars

C. Root trunks of decidous teeth are larger compared with their overall root lengths

D. Crowns of decidous incisors are wider mesiodistally than their cervico incisal lengths

Crowns of decidous incisors are wider mesiodistally than their cervico incisal lengths

18 - Any insult to cells in apposition stage result in______________?

A. Hutchinson's incisor

B. Osteodentin formation

C. Enamel hypoplasia

D. Anodontia

Enamel hypoplasia

19 - At the CEJ cementum overlaps enamel about____________?

A. 55 to 60%

B. 60 to 65%

C. 65 to 70%

D. 70 to 75%

60 to 65%

20 - At the cemento enamel junction, which of the following occurs_____________?

A. Cementum meets enamel

B. Cementum overlaps enamel

C. Cementum does not meet enamel

D. All of the above

All of the above

21 - Atypical or osteodentin is formed due to disturbance during____________?

A. Morphodifferentiation

B. Histodifferentiation

C. Apposition

D. Initiation

Histodifferentiation

22 - Average particle size of powdered gold is________________?

A. 10 um

B. 15 um

C. 30 um

D. 0.1 um

15 um

23 - Best marginal seal is provided by____________?

A. Zinc phosphate

B. Zinc oxide eugenol

C. Gutta-percha

D. Resin

Zinc oxide eugenol

24 - Blood supply of ameloblast for most of its life cycle comes form_______________?

A. Dental papilla

B. Reduced enamel organ

C. Dental Sac

D. Dental pulp

Dental Sac

25 - Bundle bone is part of____________?

A. Periodontal ligament

B. Alveolar bone

C. Cementum

D. Longbones

Alveolar bone

26 - Butt joint in cementoenamel junctions seen is _________% of cases?

A. 0.1

B. 0.3

C. 0.6

D. 0.9

0.3

27 - Calcified tissue is absent in______________?

A. Enamel

B. Dentin

C. Cementum

D. Pulp

Pulp

28 - Cavity varnishes have_____________?

A. Average bonding to tooth

B. Low bonding to tooth

C. Excellent bonding to tooth

D. No bonding to tooth

No bonding to tooth

29 - Cellular cementum and compact bone contain____________?

A. Sharpehy's fibres and elastic fibres

B. Collagen fibres and blood vessels

C. Canaliculi and incremental lines

D. Lacunae and elastic fibres

Canaliculi and incremental lines

30 - Cellular cementum is____________?

A. First formed cementum

B. Less calcified than acellular type

C. More calcified than acellular type

D. Less irregular

Less calcified than acellular type

31 - Cementum formation is seen_______________?

A. After dentin formation

B. Before dentin formation

C. Both are formed at same time

D. None of the above

After dentin formation

32 - Cementum is_____________?

A. Avascular

B. Vascular

C. Has blood supply initially only

D. None of the above

Avascular

33 - Cementum that forms in conjunction with root end formation and eruption_____________?

A. Cellular cementum

B. Acellular cementum

C. Both of the above

D. None of the above

Cellular cementum

34 - Cementum_____________?

A. Is derived from the sheath of hertwig

B. Is acellular in the apical third of the tooth

C. Often overlaps the enamel

D. Does not contain collagen fibres

Often overlaps the enamel

35 - Ceramics fired to metals are processed by_______________?

A. Heat pressing

B. Machining

C. Sintering

D. Slip casting

Sintering

36 - Cervical bulge. True is____________?

A. Enamel rods at cervical region directed occlusally

B. Results in constriction at cervical region

C. Is characteristic of decidous teeth

D. All of the above

Is characteristic of decidous teeth

37 - Chemical method of strengthening porcelain involves_________________?

A. Exchange of aluminium and sodium ions

B. Exchange of aluminium and potassium ions

C. Exchange of sodium and potassium ions

D. None of the above

Exchange of sodium and potassium ions

38 - Chemical tempering in porcelains is done to interrupt crack propagation by______________?

A. Transformation toughening

B. Dispersion of crystalline phase

C. Inducing residual compressive strength

D. All of the above

Inducing residual compressive strength

39 - Chronic periapical inflammation is usually associated with____________?

A. Ankylosis

B. Resorption of cementum

C. Hypertrophy of cementum

D. Hyperplasia of cementum

Hyperplasia of cementum

40 - Clogging of an abrasive wheel with debris causing reduction of abrasive action is called________________?

A. Blinding

B. Buffing

C. Dressing

D. Truing

Blinding

41 - Coefficient of thermal expansion of metal-ceramic alloys is________________?

A. Same as porcelain

B. More than porcelain

C. Less than porcelain

D. More than or equal to porcelain but not less

More than or equal to porcelain but not less

42 - Cohesion of gold foil is an example of______________?

A. Atomic attraction and welding

B. Annealing

C. Wedging

D. Adaptation

Atomic attraction and welding

43 - Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?

A. Greater stainability

B. Lasser content of inorganic salts

C. greater content of inorganic salts

D. Greater content of large collagen fibres

greater content of inorganic salts

44 - Compared with dental alloys, CERAMICS show____________________?

A. High ductility

B. High hardness

C. Low esthetic value

D. Susceptibility to brittle fracture

Susceptibility to brittle fracture

45 - Condensation shrinkage of porcelain during firing depends on__________________?

A. Rate of arriving at firing temperature

B. Uniformity of particle size

C. Shape and size of particle

D. Type of investment used

Shape and size of particle

46 - Crocus cloth is________________?

A. Emery

B. Garnet

C. Pumice

D. Rouge

Rouge

47 - Cusp of carbaelli can be considered a normal finding on____________?

A. Decidous mandibular 1st molar

B. Decidous maxillary 1st molar

C. Decidous maxillary 2nd molar

D. Decidous mandibular 2nd molar

Decidous maxillary 2nd molar

48 - Dead tracts in ground section appears as_____________?

A. Dentinal tubules

B. Coarse fibril bundles arranged at right angle to the dentinal surface

C. Black in transmitted light and white in reflected light

D. White in transmitted light and dark in reflected light

Black in transmitted light and white in reflected light

49 - Dehydration of specimen is carried out by____________?

A. By using 10% formalin

B. By using liquid or solid Co2

C. By using increasing percentages of alcohol

D. By using 5% nitric acid

By using increasing percentages of alcohol

50 - Dental lamina is active up to_______________?

A. 1 year

B. 2 years

C. 3 years

D. 4 years

4 years

51 - Dental papilla gives rise to_____________?

A. Pulp only

B. Pulp & Dentin

C. Pulp & Periodontal ligament

D. All of the above

Pulp & Dentin

52 - Dental porcelains are crystalline materials of________________?

A. Rubber

B. Plastic

C. Organic substances

D. Glass

Glass

53 - Dentin formed through out the life is______________?

A. Sclerotic dentin

B. Secondary dentin

C. Reparative dentin

D. All of the above

Secondary dentin

54 - Dentinal tubules are calcified in_______________?

A. Sclerotic dentin

B. Primary dentin

C. Secondary dentin

D. Interglobular dentin

Sclerotic dentin

55 - Dentinal tubules are______________?

A. Concave

B. Straight

C. S0shaped

D. None of the above

S0shaped

56 - Dentinogenesis by odontoblasts first begins at_____________?

A. Pulpal end

B. Cusp tip

C. Tooth bud stage

D. Cervical area

Cusp tip

57 - Dicor restoration is_______________?

A. Two coloured restorations

B. Heat pressed ceramics

C. Castabel ceramic

D. None of the above

Castabel ceramic

58 - Difference between primary and permanent enamel is_______________?

A. In prism arrangement

B. in mineral content

C. No difference in enamel, difference in dentin

D. None of the above

In prism arrangement

59 - Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?

A. Crystalline

B. Granular gold

C. Mat gold

D. Sponge gold

Granular gold

60 - Dispersion of crystalline phase to strengthen ceramics results in_________________?

A. dispersed porcelain

B. Glazed porcelain

C. aluminium porcelain

D. All of the above

aluminium porcelain

61 - Disturbance during the morphodifferentition stage of tooth development will result in______________?

A. Change in number of teeth

B. Ameloblastoma

C. Change in form and shape of the teeth

D. Hypoplasia

Change in form and shape of the teeth

62 - During the development of a tooth, sound coalescence of the lobes results in_____________?

A. Grooves

B. Fissures

C. Cusps

D. All of the above

Grooves

63 - During the formation of primary teeth_______________?

A. Enamel forms more cervically than dentin

B. Enamel forms faster than dentin

C. Dentin forms faster than enamel

D. Processes of their cells remain in content with each other

Dentin forms faster than enamel

64 - Ectodermal cells in tooth bud are responsible for_______________?

A. Determination of shape of crown and root

B. Formation of periodontal ligament

C. Formation of cementum

D. Formation of pulp

Determination of shape of crown and root

65 - Electralloy is an alloy of________________?

A. Gold and Platinum

B. Cobalt and Chromium

C. Gold and Calcium

D. Tin and chromium

Gold and Calcium

66 - Electrolyte used for plating copper dies is________________?

A. Ionic copper

B. Copper cyanide

C. Silver cyanide

D. Acidic copper sulphate

Acidic copper sulphate

67 - Enamel pearls are found in_____________?

A. Occlusal surface of premolars

B. Furcation areas of permanent molars

C. On the incisal edges of incisors

D. None of the above

Furcation areas of permanent molars

68 - Epithelial attachment is derived from____________?

A. Reduced enamel epithelium

B. Dental papilla

C. Inner enamel epithelium

D. Dental sac

Reduced enamel epithelium

69 - Ethoxy benzoic acid increases the strength and solubility of the cement______________?

A. Zinc oxide eugenol

B. Polycarboxylate cement

C. Zinc phosphate cement

D. Silicate cement

Zinc oxide eugenol

70 - Eugenol may be replaced in the zinc oxide eugenol cement by______________?

A. Acetic acid

B. Alginic acid

C. Phosphoric acid

D. Ortho-ethoxy acid

Ortho-ethoxy acid

71 - Excess deposition of calcium in the dentinal tubules is referred to as______________?

A. Sclerotic dentin

B. Mantal dentin

C. Interglobular dentin

D. Intertubular dentin

Sclerotic dentin

72 - Extracted teeth should be preserved in_____________?

A. Saline

B. Xylene

C. 10% Formalin

D. 10% alcohol

10% Formalin

73 - First appearance of tooth formation occurs in____________?

A. 6th week IU

B. 2nd week IU

C. 9th week IU

D. 4th week IU

6th week IU

74 - Fluid flow, in or out of the dentinal tubules is proportional to the tuble diameter by______________?

A. Third power of the diameter

B. Sixth power of the diameter

C. Square of the diameter

D. Fourth power of the diameter

Fourth power of the diameter

75 - Fluoride rich materials include ?

A. Silicate cement

B. Glass ionomer cement

C. Polycarboxylate cement

D. All of the above

All of the above

76 - Flux used in dental ceramic is________________?

A. Alumina

B. Silica

C. Kaolin

D. Boric oxide

Boric oxide

77 - Following is derivative of dental lamina____________?

A. Epithelial rests of Malassez

B. Enamel pearls

C. Rests of serrae

D. All of the above

Rests of serrae

78 - For porcelain fused to metal crown, the porcelain should have ______________?

A. High fusion expansion

B. High fusion temperature

C. Linear coefficient of thermal expansion less than that of metal

D. Linear coefficient of thermal expansion more than that of metal

Linear coefficient of thermal expansion less than that of metal

79 - Formula of hydroxyapatite crystal is____________?

A. Ca3 (Po4)2 CaCo3

B. 3Ca (Po4)2 Ca(OH)2

C. CaPo4 Ca(OH)2

D. None of the above

3Ca (Po4)2 Ca(OH)2

80 - Frozen sections can be used for the demonstration of_____________?

A. Fat

B. Mucin

C. Cartilage

D. Iron

Fat

81 - Frozen slab technique is applicable to_____________?

A. Zinc phosphate cement

B. Glass Ionomer cement

C. Zinc oxide Eugenol cement

D. Resin cement

Zinc phosphate cement

82 - Frozen slab technique of mixing zinc phosphate is used for_______________?

A. Cementing crowns

B. Temporary dressing

C. base

D. cementing orthodontic bands

Cementing crowns

83 - Glass ionomer cements are composed of______________?

A. Alumino silicate powder and phosphoric acid

B. Aluminosillicate powder and polyacrylate

C. Zinc oxide powder and phosphoric acid

D. Zinc oxide powder and polyacrylate liquid

Aluminosillicate powder and polyacrylate

84 - Greening occuring when porcelains are fired on silver free alloys may be attributed to________________?

A. Vaporization of silver from the walls of contaminated furnaces

B. Surface diffusion of silver from the marginal metal

C. More rapid silver diffusion in sodium containing glass

D. Silver ionization by porcelains with high oxygen potential

Vaporization of silver from the walls of contaminated furnaces

85 - Gubernacular canal and gubernacular cord are seen in relation to____________?

A. Permanent teeth

B. Deciduous teeth

C. Succedaneous teeth

D. None of the above

Succedaneous teeth

86 - Gubernacular canal guides the eruption of_____________?

A. Primary teeth

B. Permanent teeth

C. Both A and B

D. None of the above

Permanent teeth

87 - Hammock ligament is present_______________?

A. Between temporal and sphenoid bone

B. Between hamular notch and mandible

C. In apical area of a tooth

D. As a part of deep cervical fascia

As a part of deep cervical fascia

88 - Hardness of fully mineralized cementum is_____________?

A. Less than dentin

B. More than dentin

C. Equal dentin

D. None of the above

Less than dentin

89 - Hertwig's epithelial root sheath is made up of_______________?

A. Outer and inner enamel epithelium

B. Stratum intermedium

C. Stellate reticulum

D. Hyaline layer of Hopewell-smill

Outer and inner enamel epithelium

90 - High levels of albumin is present in____________?

A. Inner enamel epithelium

B. Outer enamel epithelium

C. Stellate reticulum

D. Stratum intermedium

Stellate reticulum

91 - How many cusps does the crown of the maxillary first primary molar have ?

A. 2

B. 3

C. 4

D. 5

92 - How many pulpal horns are there in the mandibular second primary molar ?

A. 3

B. 6

C. 4

D. 5

93 - How many roots does a primary maxillary first molar have ___________?

A. One

B. Two

C. Three

D. Four

Three

94 - If cementum is not formed______________?

A. Ankylosis may occur

B. Exforliation of teeth occur

C. Delayed eruption

D. No change occurs

Exforliation of teeth occur

95 - If overgrowth of cementum does not improve the functional qualities of cementum, it is termed as_____________?

A. Hyperplasia

B. Hypoplasia

C. Hypertrophy

D. Excementoses

Hyperplasia

96 - In adult teeth, the type of dentin present underlying dentin-enamel junction is_______________?

A. Predentin

B. Mantle dentin

C. Interglobular dentin

D. Tertiary dentin

Mantle dentin

97 - In cap stage, regulating factor for cusp shape formation is present in____________?

A. Dental papilla

B. Dental follicle

C. Inner enamel epithelium

D. Enamel Knot

Enamel Knot

98 - In considering the process of eruption, the pre-functional eruptive stage of a tooth begins when the_____________?

A. Bud stage begins

B. Cap stage begins

C. Bell stage begins

D. Dental lamina begins forming

Dental lamina begins forming

99 - In method of firing: A shorter firing period at a higher temperature is considered better_______________?

A. A large time period at a lower temperature is preferred

B. A long firing period at a very high temperature is preferred

C. A short firing period at a very low temperature is preferred

D. none of these

A long firing period at a very high temperature is preferred

100 - In mineralization which one of the following is known as Epitaxy ?

A. Booster Mechanism

B. Seeding theory

C. Alkaline Phosphatase theory

D. Cartier/s Adenosine Triphosphate theory

Seeding theory

101 - In multirooted teeth, formation of multiple roots is due to presence of_____________?

A. Epithelial diaphragm

B. Cell rests of Malassez

C. Toot bud division or bell stage

D. None of the above

Epithelial diaphragm

102 - In non-eugenol pastes the constituents are mixed in______________?

A. Phosphoric Acid

B. Ethyl alcohol

C. Benzoic acid

D. None of the above

Benzoic acid

103 - In porcelain metal elements are embedded in the matrix of________________?

A. Rubber matrix

B. Glass

C. Plastic

D. Resin matrix

Glass

104 - In resorption of roots of the primary teeth, the dental pulp_____________?

A. Plays a passive role

B. Becomes a fibrotic non-vital mass

C. Initiates resorption from the inner surface of roots

D. Aids in formation of secondary dentin slowing down resorption

Plays a passive role

105 - In the majority of situations, that first decidous tooth to erupt is the____________?

A. Mandibular central incisor

B. Mandibular first molar

C. Maxillary central incisor

D. Maxillary second molar

Mandibular central incisor

106 - In type II gold alloys _______ Karat gold is used?

A. 24 K

B. 22 K

C. 18 K

D. 10 K

18 K

107 - Increased amount of powder in zinc phosphate cement mixture will cause_______________?

A. Decreased strength

B. Decreased film thickness

C. Decreased solubility

D. Increased setting time

Decreased solubility

108 - Inorganic content of cementum is_____________?

A. Less than bone

B. More than bone

C. Equal to that of bone

D. More than that of enamel

Less than bone

109 - Inorganic content of cementum is______________?

A. 45 to 50%

B. 50 to 55%

C. 55 to 60%

D. 60 to 65%

45 to 50%

110 - Inter globular dentin results due to_____________?

A. Failure of coalescence of calcospherities

B. Fracture of the dentin

C. Artifact in light microscopy

D. Disturbance in dentinal tubules

Failure of coalescence of calcospherities

111 - Intermediate cemental layer_____________?

A. Does not exhibit features of either dentin of cementum

B. Predominantly seen in apical tow thirds of roots of molars and premolars and is rare in incisors or deciduous teeth

C. Represents area of entrapment of hertwig's sheath in dentin or cementum

D. All of the above are correct

All of the above are correct

112 - Intermediate cementum is___________?

A. Between enamel and cementum

B. Found at dentinocemental junction

C. Apical third

D. Coronal third

Found at dentinocemental junction

113 - Intermediate cementum is____________?

A. Highly defined cellular zone near cemento – dentinal junction (CDJ)

B. Highly defined fibrillar zone near CDJ

C. Poorly defined zone near cemento-dentinal junction

D. Both a and B

Poorly defined zone near cemento-dentinal junction

114 - Korffs fibres are seen in______________?

A. Mantle dentin

B. Secondary dentin

C. Reactionary dentin

D. Indeed dermal tubules

Mantle dentin

115 - Lip furrow band is______________?

A. Vestibular lamina

B. Successional lamina

C. Dental lamina

D. Basal lamina

Vestibular lamina

116 - Machineable glass ceramic is________________?

A. Cerestore

B. Decor MGC

C. Infusium

D. Leucite

Decor MGC

117 - Matrix vesicles_______________?

A. Are found in mantle dentin

B. Contain collagen

C. Produce alkaline phosphatase

D. Inhibit mineralization

Are found in mantle dentin

118 - Maximum fluoride content is seen in_____________?

A. Dental cementum

B. Dental pulp

C. Enamel

D. Dentin

Dental cementum

119 - MEchanism of adhesion of GIC restoration with tooth surface is by mean of ______________?

A. Carboxyl group

B. Chelates with Metal Ions

C. C=C double bond

D. Polymer chains

Carboxyl group

120 - Membrana performative is seen in_________________?

A. Bell stage

B. Cap stage

C. Bud stage

D. Advanced bell stage

Bell stage

121 - Mesiodistal width is more than cervico- incisal length of crown in_____________?

A. Permanent central incisors

B. Decidous maxillary central incisors

C. Permanent maxillary canines

D. Permanent mandibular lateral incisors

Decidous maxillary central incisors

122 - Minimum thickness for type I zinc phosphate cement should be_______________?

A. 15 microns

B. 25 microns

C. 50 microns

D. 100 microns

25 microns

123 - Mirgration of odontoblasts into dentinal tubules occurs during ________________?

A. Cavity preparation

B. Dehydration

C. Water irrigation

D. None of the above

Cavity preparation

124 - Mode of failure during dislodgement of prosthesis cemented with zinc poly carboxylate cement is usually seen at the_____________?

A. Cement tooth interface

B. Cement prosthesis interface

C. Cleavage through the cement layer

D. Fracture of tooth or prosthesis

Cement prosthesis interface

125 - Morphological stages of tooth development are explained based on_____________?

A. Shape of enamel organ

B. Shape of tooth germ

C. Function of enamel organ

D. Shape of dental papilla

Shape of tooth germ

126 - Most preferable cement for temporary restoration______________?

A. GIC

B. ZOE

C. Ca (OH)2

D. Zinc polycarboxylate cement

ZOE

127 - Movement of tooth to close the intermaxillary gap during eruption is due to____________?

A. Physiological tooth migration

B. Active eruption

C. Passive eruption

D. None of the above

Active eruption

128 - Nutrition for ameloblasts after 1st layer of enamel is laid is______________?

A. Dental sac

B. Odontoblastic process

C. Ree

D. Dental Papilla

Dental sac

129 - One of the following statement is unique about circumpulpal dentine______________?

A. Collagen fibers are oriented perpendicular to DEJ

B. Vonkorff fibers are present

C. Contain phosphophoryn

D. Requires matrix vesicle for mineralization

Contain phosphophoryn

130 - Opaque porcelain________________?

A. Is Feldspathic glass

B. Contains opacifier like zirconium and titanium oxide

C. Not used to mask the colour of the cement used in placing of restoration

D. Used to produce the characteristic translucence, which is an inherent aspect of the incisal edge in natural teeth

Contains opacifier like zirconium and titanium oxide

131 - Oral tissue for microscopic examination is prepared by_______________?

A. Embedded in paraffin and sectioned

B. Embedded in paradion and sectioned

C. Frozen and sectioned

D. All of the above

All of the above

132 - Order of development of tooth germ is____________?

A. Bell-bud-cap

B. Cap-bell-bud

C. Bud-cap-bell

D. Bell-cap-bud

Bud-cap-bell

133 - Organic portion can be separated from the mineral by_____________?

A. Incineration/organic chelation

B. Decalcification

C. Devitrification

D. Combustion

Incineration/organic chelation

134 - Osteoblasts appear basic gram staining due to______________?

A. Increased ribonucleic acid

B. Acidic ground substance

C. Increased mitochondria

D. Presence of basic ground substance

Increased ribonucleic acid

135 - Outer and inner enamel epithelium first seen in____________?

A. Bud stage

B. Advanced bell stage

C. Cap stage

D. Bell stage

Cap stage

136 - Percentage of zinc in ZOE cement is__________________?

A. 0.6

B. 0.7

C. 0.8

D. 0.9

0.7

137 - pH of fully set zinc phosphate______________?

A. 44989

B. 45021

C. 45084

D. 45115

45084

138 - PH of polycarboxylate liquid is____________?

A. 5

B. 7

C. 8

D. 1.7

1.7

139 - PH of which cement remain below 7 even after 1 month after insertion into the cavity ?

A. Glass Ionomer Cement

B. Zinc Phosphate

C. Resin cement

D. Silicate cement

Silicate cement

140 - Phenomenon in which porcelain appears different under varying light condition is______________?

A. Translucency

B. Refractive optics

C. Metamerism

D. Opacification

Metamerism

141 - Physically and chemically, the dentin is closely related to______________?

A. Bone

B. Acellular cementum

C. Enamel

D. None of the above

Bone

142 - Pitting of direct filling old restoration usually results from_________________?

A. Using contaminated gold foil

B. Poor finished preparation

C. Improper stepping of condenser point

D. Using small condenser point

Improper stepping of condenser point

143 - Polycarboxylate cement is used for_____________?

A. Temporary restoration

B. Leuting

C. Permanent restoration

D. Die material

Leuting

144 - Porcelain binds to metal in PFM crown by_________________?

A. Metallic bind

B. Transparency

C. Chemical bond

D. B and C

B and C

145 - Porcelain denture teeth________________?

A. Have a higher coefficient of thermal expansion than acrylic teeth:

B. Have a lower abrasion resistance than enamel

C. Should be used where the inter dental clearance is small

D. Have a higher abrasion resistance than gold

Have a higher abrasion resistance than gold

146 - Porcelain is best fired__________________?

A. In open air

B. Under air compression

C. When several layer are fired simultaneously

D. Under minimum pressure

Under air compression

147 - Porosity in porcelain at condensation stage depends on_________________?

A. Shape and size of particle

B. Uniform distribution of particle size

C. Number of particles

D. None of the above

Shape and size of particle

148 - Porosity in porcelain can be prevented by_______________?

A. Thoroughness of condensation

B. Rapidity of firing

C. High firing temperature

D. All of the above

Thoroughness of condensation

149 - Powdered gold is___________________?

A. Made by a combination of chemical precipitation and atomization

B. Made by electrolytic precipitation

C. Made by beating pure gold at high temperatures

D. Made by milling pure gold ingots

Made by a combination of chemical precipitation and atomization

150 - Primary dentition period is______________?

A. From birth to 11 years

B. From 6 months to 11 years

C. From 6 months to 6 years

D. From 6 years to 11 years

From 6 months to 6 years

151 - Primary teeth differ from permanent teeth in following aspects ?

A. Thickness of enamel and dentin

B. Pulp chambers are longer

C. Roots are flaring

D. All of the above

All of the above

152 - Pulp chambers and roots canals in decidous teeth______________?

A. Wide and deep

B. Shallow and narrow

C. Wide and narrow

D. Shallow and wide

Shallow and wide

153 - Pyroplastic flow of porcelain is due to___________________?

A. High temperature during glazing

B. Low temperature during glazing

C. Improper condensation

D. High firing temperature

High temperature during glazing

154 - Quartz is Dental porcelain is______________?

A. Strengthener

B. Binder

C. Pigment

D. Crack minimzer

Strengthener

155 - Reestablishing the former outline of the root surface is_____________?

A. Anatomic repair

B. Functional repair

C. Physiological repair

D. Hyperplasia

Anatomic repair

156 - Regarding teeth which statement is wrong ?

A. Enamel is harder than dentine

B. Enamel has no cells

C. Ameloblast secrete enamel and dentine

D. Odontoblast produce dentin

Ameloblast secrete enamel and dentine

157 - Resorption of dental tissue is caused by_____________?

A. Osteoclasts

B. Osteoblasts

C. Odontoclasts

D. Odontoblasts

Odontoclasts

158 - Resorption of root of primary incisors starts at_____________?

A. 4 yrs

B. 6 yrs

C. 8 yrs

D. 10 yrs

4 yrs

159 - Root lengthening is contributed by____________?

A. Cellular cementum

B. Acellular cementum

C. Intermediate cementum

D. All of the above

Cellular cementum

160 - Roots of primary and secondary teeth are different in that the primary roots are more divergent and flaring. The other difference _____________?

A. Primary roots show less a accessory and lateral canals

B. Primary roots resorb more easily

C. Primary roots are shorter

D. None of the above

Primary roots show less a accessory and lateral canals

161 - S shape of dentinal tubules is due to______________?

A. Incremental deposition

B. Peritubular dentin

C. Crowding of odontoblasts

D. Due to excess amount of organic component

Crowding of odontoblasts

162 - Sclerotic dentin has following features_____________?

A. Caries susceptible

B. Insensitive

C. Hypersensitive

D. Resistant to caries

Resistant to caries

163 - Secondary caries is least likely seen with_______________?

A. Silicate cement

B. Zinc phosphate

C. Polycarboxylate

D. GIC

Silicate cement

164 - Secondary cementum is generally confined to_____________?

A. Cervical third of the root

B. Middle third of the root

C. Apical third of the root

D. No secondary cementum forms

Apical third of the root

165 - Shape of crown and the size of the roots is determined by______________?

A. Pulp

B. Dentin

C. Enamel

D. Cementum

Dentin

166 - Silicate cement is indicated in________________?

A. Mouth breathers

B. Patients with high caries index

C. In the restoration of posterior tooth

D. None of the above

Patients with high caries index

167 - Specific stain for fat cells is___________?

A. Eosin & haematoxylin

B. Carbol fuschin

C. Sudan III

D. Cresyl violet

Sudan III

168 - Stage recognized in the firing of dental porcelain given below. Which of state is not correct ?

A. Cold stage bisque

B. Low bisque

C. Medium bisque

D. High bisque

Cold stage bisque

169 - Stellate reticulum is seen in______________?

A. Dental lamina

B. Enamel organ

C. Hertwig's root sheath

D. All of the above

Enamel organ

170 - Strength of zinc phosphate is effected by_______________?

A. Temp of glass slab

B. P:L ratio

C. Consistency of mix

D. Alteration of mixing time

P:L ratio

171 - Super abrasive is________________?

A. Sand

B. Silicon arbide

C. Diamond

D. Aluminum oxide

Diamond

172 - Teeth with out antagonist if erupt is called____________?

A. Stable

B. Over erupted

C. Supra erupted

D. Submerged

Supra erupted

173 - Temporary structures in enamel organ are (before enamel formation) ?

A. Enamel knot

B. Enamel cord

C. Both A and B

D. Enamel Cuticle

Both A and B

174 - The addition of which of the following can accelerate the setting time of zinc oxide cement_____________?

A. Zinc acetate

B. Barium sulphate

C. Zinc sulphate

D. Barium chloride

Zinc acetate

175 - The apical foramen of a fully developed permanent tooth is usually lined by_____________?

A. Dentin

B. Cementum

C. Epithelial rest cells

D. The Epithelial diaphragm

Cementum

176 - The average diameter of coronal dentinal tubules near the pulp is____________?

A. 0.2-0.5 microns

B. 2-3 microns

C. 0.2-0.3 microns

D. 7 microns

2-3 microns

177 - The average life of silicate cement restoration is______________?

A. 2 years

B. 4 years

C. 6 years

D. 8 years

4 years

178 - The best tissue tolerated material for crown and bridge_______________?

A. Highly polished porcelain

B. Highly polished acrylic

C. Highly glazed porcelain

D. Highly polished metal

Highly glazed porcelain

179 - The bud, cap and bell stage of the developing tooth are based, on growth of the______________?

A. Stellate reticulum

B. Dental papilla

C. Enamel organ

D. Dental sac

Enamel organ

180 - The cap stage in tooth development is characterized by_____________?

A. morphodifferentiation

B. reversal of functional polarity

C. Formation of hammock ligament

D. Increased mitotic activity

Increased mitotic activity

181 - The carat for Au foil used for restorations is_______________?

A. 18

B. 20

C. 22

D. 24

182 - The cavity varnish applied reduces post operative sensitivity in amalgam restoration by____________?

A. Decreasing conduction of heat to pulp

B. Minimize marginal leakage around restoration

C. By altering the chemical composition of restoration materials

D. By preventing penetration of corrosion products into the dentinal tubules

Minimize marginal leakage around restoration

183 - The cells of the enamel organ which differentiate into future ameloblasts are_____________?

A. Cells of inner enamel epithelium

B. Cells of outer enamel epithelium

C. Cells of stellate reticulum

D. Cells of stratum intermedium

Cells of inner enamel epithelium

184 - The cells that form secondary dentin are_______________?

A. Cementoblasts

B. Fibroblasts

C. Odontoblasts

D. Osteoblasts

Odontoblasts

185 - The cells, which are responsible for removal of bone matrix in bone resorption, are_____________?

A. Osteoblast

B. Fibrocytes

C. Polymorphs

D. Osteoclasts

Osteoclasts

186 - The cement Which is least soluble in oral cavity______________?

A. Glass ionomer

B. Resin cement

C. Polycarboxylate cement

D. Silico-Phosphate cement

Resin cement

187 - The cementuoenamel junction is approximately at the level at which the root canal becomes_____________?

A. Twisted

B. Curved

C. Pulp chamber

D. Lateral canal

Pulp chamber

188 - The chief advantage of zinc phosphate cement is its___________?

A. Good compressive strength

B. Film thickness

C. Lack of irritation

D. Low solubility

Film thickness

189 - The cohesive gold used as bulk filler is_____________?

A. Electra alloy

B. Mat gold

C. Spherical gold

D. Gold foll

Mat gold

190 - The components of future TMJ shows development at_____________?

A. 6 weeks

B. 18 weeks

C. 10 weeks

D. 16 weeks

10 weeks

191 - The crowns and roots of primary molar at their cervical portions are more____________?

A. Slender mesiodistally

B. Slender anteroposteriorly

C. Bulkier mesiodistally

D. Buliker anteroposteriorly

Slender mesiodistally

192 - The deciduous teeth can be differentiated from permanent teeth by_____________?

A. Enamel prismatic arrangement

B. Dentinal tubule arrangement

C. Primary and secondary dentin

D. Mineral content

Enamel prismatic arrangement

193 - The dentin adjacent to the dentinoenamel junction is called the______________?

A. Mantle dentin

B. Circumpulpal dentin

C. Predentin

D. Secondary dentin

Mantle dentin

194 - The dentin receptors are unique because_____________?

A. They elicit pain to hot and cold

B. They elicit pain to touch and pressure

C. They elicit pain to chemicals

D. Elicit only pain as a response

Elicit only pain as a response

195 - The direction of enamel rods in decidous teeth is_____________?

A. Same as permanent teeth

B. Inclined in an apical direction in the cervical third of crown

C. Inclined in an occlusal direction in the cervical third of crown

D. None of the above

Inclined in an occlusal direction in the cervical third of crown

196 - The disturbances occurred during Calcification stage of tooth development is seen in_____________?

A. Peg laterals

B. Microdontia

C. Supernumerary tooth

D. Interglobular dentin

Interglobular dentin

197 - The dual cure cements should not be used with light transmitting prostheses thicker than____________?

A. mm

B. 1.5 mm

C. mm

D. 2.5 mm

2.5 mm

198 - The effect of zinc oxide-eugenol on the pulp ?

A. Is irritating

B. Encourages pulpal fibrosis

C. Is sedating

D. Has no effect

Is sedating

199 - The first porcelain tooth material was introduced by______________?

A. DeChemant

B. Ash

C. Plateau

D. McClean

DeChemant

200 - The first sign of future deciduous teeth as a thickening of oral ectoderm appears at about_____________?

A. 25th day of Intra uterine life

B. 34th day of Intra uterine life

C. 56th day of Intra uterine life

D. 20 wks of Intra uterine life

56th day of Intra uterine life

201 - The formation of the dental lamina is initiated by______________?

A. Forebrain

B. Rathke's pouch

C. Neural crest cells

D. Odontoblasts

Neural crest cells

202 - The formation of which of the following does not represent normal physiologiacl process of dentin formation_______________?

A. Primary and secondary dentin

B. Secondary dentin and circumpulpal dentin

C. Tetiary dentin and sclerotic dentin

D. All of the above

Tetiary dentin and sclerotic dentin

203 - The hertwig's epithelial root shealth is essential to development of the root because it_______________?

A. Gives rise to cementoblasts that produce cementum of the root

B. Moulds the shape of roots and stimulates differentiation of odontoblasts

C. Given rise to odontoblasts that lay down dentin of the root

D. Remians as an essential constituents of the periodontal ligament

Moulds the shape of roots and stimulates differentiation of odontoblasts

204 - The highest ( longest ) and sharpest cusp on the decidous mandibular first molar is____________?

A. Mesiolingual

B. Distolingual

C. Mesiobuccal

D. Distobuccal

Mesiolingual

205 - The ideal temperature of water bath for softening fluid wax is about________________?

A. 51 to 54 degree F

B. 51 to 54 degree C

C. 70 to 75 degree F

D. 70 to 75 degree C

51 to 54 degree C

206 - The largest mesiodistal diameter in primary dentition is____________?

A. Mandibular 1st molar

B. Mandibular2nd molar

C. Maxillary 2nd molar

D. None of the above

Mandibular2nd molar

207 - The logical explanation for the unique anticariogenic property of most silicate cements is______________?

A. The reduction in enamel solubility due to fluoride uptake by enamel

B. That beryllium flux is used in silicates

C. That silicates show very little leakage at the margins of the restoration

D. Due to the high silica content

The reduction in enamel solubility due to fluoride uptake by enamel

208 - The main bulk of dentin is formed by______________?

A. Peritubular dentin

B. Mantle dentin

C. Inter tubular dentin

D. Predentin

Inter tubular dentin

209 - The main components is sillicophosphate cement________________?

A. Zinc phosphate and GIC

B. Silicate and GIC

C. ZOE and Silicate

D. Zinc phosphate and SIlicate

Zinc phosphate and SIlicate

210 - The main purpose of adding metallic oxides in ceramic is________________?

A. Colour matching

B. Transparency

C. Opacity

D. None of the above

Colour matching

211 - The major component of zinc phosphate cement is_____________?

A. Zinc oxide

B. Phosphoric acid

C. Zinc

D. None of the above

Zinc oxide

212 - The malleting force is directed______________?

A. Perpendicular to the walls

B. Parallel to long axis of crown

C. 45° to the wall

D. None of the above

45° to the wall

213 - The material used in its pure form in dentistry is______________?

A. Composite

B. Silver

C. Gold

D. Amalgam

Gold

214 - The maximum rate of eruption, as the tooth cusps reach the surface epithelium is around ________ μm/day?

A. 100

B. 75

C. 50

D. 25

215 - The maximum shrinkage during firing proces in ceramic occurs in__________________?

A. High Bisque stage

B. Low Bisque stage

C. Medium Bisque stage

D. Fusion stage

Medium Bisque stage

216 - The melting point of titanium is __________ degree celsius?

A. 1056

B. 1560

C. 1668

D. 1886

1668

217 - The microhardness of dentin is about____________?

A. 1/2 that of enamel

B. 1/7 that of enamel

C. 1/4 that of enamel

D. 1/5 that of enamel

1/4 that of enamel

218 - The most accepted theory for dentin sensitivity is: or Which of the following is the most accepted theory of transmission of dental sensation_____________?

A. Transduction theory

B. Direct neural stimulation

C. Hydrodynamic theory

D. Hydrostatic theory

Hydrodynamic theory

219 - The most accepted theory of tooth eruption is____________?

A. Hydrodynamic theory

B. Clone theory

C. Periodontal ligament traction theory

D. Vascular theory

Periodontal ligament traction theory

220 - The most commonly used, most biocompatible and adhesive cement is______________?

A. Zinc phosphate

B. Zinc oxide eugenol

C. Calcium hydroxide

D. Glass ionomer

Glass ionomer

221 - The most toxic form of mercury is_________________?

A. Methyl and ethyl mercury

B. Mercury vapour

C. Inorganic mercury forms

D. Mercury sulphide

Methyl and ethyl mercury

222 - The opacity in ceramics is achieved by adding_______________?

A. Boric oxide

B. Copper oxide

C. Silica

D. Titanium oxide

Titanium oxide

223 - The organic lining of the calcified dentinal tubules is known as_______________?

A. Lamina propria

B. Lamina lucida

C. Lamina limitans

D. Lamina densa

Lamina limitans

224 - The pain transmission through dentin is______________?

A. Direct neural stimulation

B. Fluid or hydrodynamic theory

C. Transduction theory

D. All of the above

All of the above

225 - The preferred material for repair of fractured denture base is______________?

A. Chemically cure resin

B. Heat curve resin

C. Light cure resin

D. Vinyl resin

Chemically cure resin

226 - The primary lateral incisors begin to calcify about the_____________?

A. 4th month of life

B. 4th month in utero

C. 41/2 month in utero

D. 5th month in utero

41/2 month in utero

227 - The primary teeth that present the most outstanding morpholgic deviations from permanent teeth are______________?

A. Central incisors

B. Mandibular first molar

C. Mandibular second molar

D. Canines

Mandibular first molar

228 - The principal constituent of set silicate cement matrix is_______________?

A. Hydrated Aluminium phosphate

B. Hydrated Aluminium Phosphate with calcium fluoride

C. Hydrate Aluminosilicate gel

D. Hydrated Aluminium phosphate crystal, CAF2 alluminosiliate gel

Hydrated Aluminium phosphate crystal, CAF2 alluminosiliate gel

229 - The principle application of zinc phosphate cement is_____________?

A. In final cementation

B. As temporary cementation

C. As a temporary filling material

D. It has less occlusal wear

In final cementation

230 - The pulp of first primary molar contains________________?

A. Four pulp horn and three root canal

B. Three pulp horn and three root canal

C. Two pulp horn and two root canal

D. Two pulp horn and three root canal

Four pulp horn and three root canal

231 - The pure form of gold used in dentistry is known as___________________?

A. Cohesive gold

B. Non cohesive gold

C. Class I casting gold

D. Class IV casting gold

Cohesive gold

232 - The region in which cementum formation is most rapid is_____________?

A. Middle

B. Coronal

C. Apical

D. Interradicular

Middle

233 - The relationship between the pulpal and periodontal tissue complex begins during dental development at_____________?

A. Adolescent stage

B. 5-10 years

C. Embryonic stage

D. None of the above

Embryonic stage

234 - The setting of zinc phosphate is accelerated by_____________?

A. Adding a drop of water

B. Increasing mixing time

C. Cooling the slab

D. Adding a drop of oleic acid

Adding a drop of water

235 - The setting of zinc phosphate may be retarded by ?

A. Increased in the ratio of powder to liquid

B. Diluting the liquid with water

C. Increase the addition of powder to liquid

D. Decrease the addition of powder to liquid

Decrease the addition of powder to liquid

236 - The setting time of ZnPO4 cement can be retarded by_____________?

A. mixing more powder to the liquid

B. mixing powder to liquid, checked by water

C. slower addition of powder to liquid

D. faster addition of powder to liquid

slower addition of powder to liquid

237 - The sharpest cusp of primary first molar tooth is____________?

A. Mesiobuccal

B. Distobuccal

C. Mesiolingual

D. Distolingual

Mesiolingual

238 - The successors of deciduous teeth develops form_______________?

A. Successional lamina

B. Dental lamina

C. Stellate reticulum

D. Neutral ectodermal cells

Successional lamina

239 - The temperature (in °F) of the mixing slab for silicate cements should be_____________?

A. 55 – 65

B. 65 – 75

C. 75 – 85

D. 85 – 95

65 – 75

240 - The tow cements which hold with the tooth are_______________?

A. GIC and polycarboxylate

B. GIC and ZnPO4

C. ZnPO4 and silicate

D. GIC and silicate

GIC and polycarboxylate

241 - The type of dentin that is formed prior to root completion______________?

A. Inter tubular dentin

B. Peritubular dentin

C. Circum pulpal dentin

D. Secondary dentin

Circum pulpal dentin

242 - The type of tertiary dentin which contains cellular inclusions is found in_____________?

A. Sclerotic dentin

B. Mantle dentin

C. Predentin

D. Osteodentin

Osteodentin

243 - The zone of dentin most recently formed and uncalcified is known as____________?

A. Mantle dentin

B. Circumpulpal dentin

C. Predentin

D. Secondary dentin

Predentin

244 - Thermal conductivity of which material is close to dentin____________?

A. Amalgam

B. Silicate

C. Composite resin

D. Cavity varnish

Silicate

245 - Thickness of luting cement is_____________?

A. 20-40μ

B. 10-20μ

C. 60-80μ

D. 1-2μ

20-40μ

246 - To prevent porosity in dental porcelain it should be backed________________?

A. Boric oxide

B. In vacuum

C. For long period

D. Under pressure

In vacuum

247 - Tome's firbres are____________?

A. With out but not with in the dentin

B. Odontoblastic processes in dental tubules

C. Type of sharpey's fibres

D. Originate from tome's granular layer

Odontoblastic processes in dental tubules

248 - Tooth buds of permanent mandibular incisors are situated_____________?

A. Lingual to primary teeth

B. Inferior to primary teeth

C. Labial to primary teeth

D. A and B

A and B

249 - Tooth develops from_______________?

A. Ectoderm, mosoderm

B. Ectoderm

C. Mesoderm

D. Ectoderm and endoderm

Ectoderm, mosoderm

250 - Tooth eruption is due to______________?

A. Osteoclastic activity

B. Proliferation of cells at crypt

C. Exforliation of primary tooth

D. Eruptive force

Eruptive force

251 - Torsional force is_______________?

A. Compression

B. Tensile force

C. Shear

D. Transverse bending force

Shear

252 - Transmission of stimulus across dentin is______________?

A. Direct activation of nerve endings

B. Correlated with the innervation density of the dentin

C. Stimulus induced fluid flow

D. There is no transmission of stimulus across dentin

Stimulus induced fluid flow

253 - Transverse ridge is prominent on occlusal surface of which of the following decidous teeth ?

A. Mandibular first molar

B. Maxillary first molar

C. Mandibular second molar

D. Maxillary second molar

Mandibular first molar

254 - Trauma or excessive occlusal forces causes_____________?

A. Hyperplasia of cementum

B. Hypertrophy of cementum

C. Resorption of cementum

D. None of the above

Resorption of cementum

255 - What is the thickness of the layer of primsless enamel found in primary teeth_____________?

A. 25 μm

B. 50μm

C. 75μm

D. 100μm

25 μm

256 - What is the working time of zinc polyacrylate cement ?

A. 1 Minutes

B. 2 Minutes

C. 3 Minutes

D. 4 Minutes

3 Minutes

257 - When Gold fused with porcelain is fired at very high temperature greenish discoloration of cervical margin is due to________________?

A. High firing temperature

B. Disintegration of opaque layer

C. Presence of copper

D. Formation of excess oxides

Presence of copper

258 - When porcelain is basked against metal, it should possess a________________?

A. high fusion expansion

B. high fusion temperature

C. linear coefficient of thermal expansion less than but close to that of metal

D. Linear coefficient of thermal expansion greater than, but close to that of the metal

linear coefficient of thermal expansion less than but close to that of metal

259 - When selection the colour of cement to use for cementing a porcelain jacket crown, the powder being tested is best mixed with______________?

A. Glycerin-water solution

B. Cement liquid

C. Alcohol

D. Only water

Glycerin-water solution

260 - When viewed occlusally, a primary mandibular second molar closely resembles which of the following mandibular teeth ?

A. Permanent second molar

B. Permanent first molar

C. Second premolar

D. Primary first molar

Permanent first molar

261 - Which among the following is NOT a common finding of the decidous dentition ?

A. Tight contacts, absence of spacing

B. Shallow overjet and overbite

C. Flush terminal plane

D. Ovoid arch form

Tight contacts, absence of spacing

262 - Which cement base has the highest modulus of elasticity ?

A. Zinc polycarboxylate

B. Polymer reinforced ZOE cement

C. Zinc phosphate

D. Glass inomer cement

Zinc phosphate

263 - Which cement is irritating to the pulp ?

A. Carboxylate cement

B. Zinc oxide-eugenol cement

C. Zinc phosphate

D. Ethoxybenzoic acid

Zinc phosphate

264 - Which component of zinc oxide-eugenol cement gives its strength ?

A. Rosin

B. Zinc oxide

C. Zinc acetate

D. Oil of cloves

Zinc oxide

265 - Which dental tissue doesn't contain nerves ?

A. Bone

B. Dentin

C. Cementum

D. Pulp

Cementum

266 - Which enzyme is associated with the mineralization_____________?

A. Acid phosphatase

B. Alkaline phosphatase

C. Adenosine triphosphate

D. Amino peptidase

Alkaline phosphatase

267 - Which glass ionomer cement develops early resistance to water intake on setting ?

A. Reinforced auto care glass ionomer cement

B. Compomer

C. Resin modified glass ionomer cement

D. Ceramic reinforced glass ionomer cement

Resin modified glass ionomer cement

268 - Which is not present in porcelain________________?

A. Silica

B. Feldspar

C. Calcium carbonate

D. Amorphous material

Amorphous material

269 - Which is the cement with adhesive properties ?

A. Zinc oxide eugenol

B. Zinc polycarboxylate

C. Glass ionomer

D. Both B & C

Both B & C

270 - Which of the areas of the tooth is most sensitive during cavity preparation ?

A. Enamel (anterior teeth)

B. Enamel (Posterior teeth)

C. Dentin

D. Dentinoenamel junction

Dentinoenamel junction

271 - Which of the following acts as accelerator in Zinc oxide eugenol______________?

A. ZnCl2 + Eugenol

B. ZnCl2 + ZnSO2

C. Eugenol + ZnO

D. Zn(OH)2 + ZnO

ZnCl2 + ZnSO2

272 - Which of the following anomalies occur during the initiation and proliferation of tooth development ?

A. Amelogenisis imperfecta

B. Dentinogenesis imperfecta

C. Enamel hypoplasia

D. Oligodontia

Oligodontia

273 - Which of the following bur is used in the preparation of cavity restored with porcelain fused to metal ?

A. Carbide bur

B. Diamond bur

C. Stainless steel bur

D. Diamond but for porcelain and carbide bur for metal

Diamond but for porcelain and carbide bur for metal

274 - Which of the following cements bonds to tooth structure, which has an anticariogenic effect, has a degree of translucency and does not irritate the pulp ?

A. Polycarboxylate cement

B. Resin cement

C. Silicate cement

D. Glass ionomer cement

Glass ionomer cement

275 - Which of the following cements have anti cariogenic properly________________?

A. ZOE

B. Calcium Hydroxide

C. Zinc silicophosphate

D. Zinc phosphate

Zinc silicophosphate

276 - Which of the following cements is contraindicated in mouth breathers_______________?

A. Silicate

B. ASPA

C. Polycarboxylate

D. Zinc phosphate

Silicate

277 - Which of the following cements is most biocompatible with pulp ?

A. GIC

B. Copper cement

C. Zinc phosphate cement

D. Zinc oxide eugenol cement

Zinc oxide eugenol cement

278 - Which of the following cements is most irritant to pulpal tissues ?

A. Zinc phosphate

B. Silicate

C. Glass ionomer

D. Polycarboxylate

Silicate

279 - Which of the following cements is most kind to pulp ?

A. Glass ionomer

B. Polycarboxylate

C. Silicate

D. Resin cement

Polycarboxylate

280 - Which of the following characterizes the silicate cement______________?

A. It is pulpal irritant

B. It is highly cariogenic

C. Chemically attaches to the tooth structure

D. It produces thinnest film surface

It is pulpal irritant

281 - Which of the following decidous molars bears the greatest resemblance to a premolar _____________?

A. Maxillary first

B. Maxillary second

C. Mandibular first

D. Mandibular second

Maxillary first

282 - Which of the following dentinal layers is more mineralized______________?

A. Peritubular dentin

B. Inter tubular dentin

C. Dentinal tubules

D. Circum pulpal dentin

Peritubular dentin

283 - Which of the following do polycarboxylate and GIC have in common ?

A. Polysiloxane

B. Phosphoric acid

C. Polyacrylic acid

D. Ion leachable glass

Polyacrylic acid

284 - Which of the following factors are primarily contributory to the shedding of deciduous tooth ?

A. Hydrostatic

B. Vascular pressure

C. Oncotic pressure

D. Masticatory pressure

Masticatory pressure

285 - Which of the following has the maximum faciolingual diameter of the crown__________?

A. Decidous maxillary 2nd molar

B. Decidous maxillary 1st molar

C. Decidous mandibular 2nd molar

D. Decidous mandibular 1st molar

Decidous maxillary 2nd molar

286 - Which of the following is a rare occurrence______________?

A. Enamel meet cementum at a point

B. Enamel overlaps cementum

C. Cementum overlaps enamel

D. Both never meet

Enamel overlaps cementum

287 - Which of the following is common to both zinc eugenol cement and polycarboxylate cement?

A. Polyacrylic acid is liquid

B. Chemical bond to tooth structure

C. Chelation

D. Substitution o eugenol by EBA to increase strength of cement

Chelation

288 - Which of the following is correct ?

A. Parotid – stenson's duct – pure serous

B. Submandibular – Wharton's duct – mixed and predominantly serous

C. Sublingual gland – bartholin's duct – mixed and predominantly mucous

D. All of the above

All of the above

289 - Which of the following is correct?

A. Roof of mandible contains thin, compact bone

B. Articular tubercle is composed of spongy bone covered with thin compact bone

C. Condyle contains red bone marrow

D. All of the above

All of the above

290 - Which of the following is correct?

A. Fibronectin helps in attachment of fibroblasts to collagen

B. Cementicles are found in periodontal ligament of order individuals

C. The large nerve fibres are myelinated and are concerned with discerment of touch

D. All of the above

All of the above

291 - Which of the following is correct?

A. Cementum is more resistant to resorption than bone

B. Bone is more resistant to resorption than cementum

C. Both are equally resorbable

D. None of the above

Cementum is more resistant to resorption than bone

292 - Which of the following is correct?

A. Reparative dentin is characterized by having fewer and more twisted tubules than normal dentin and may include odontoblasts

B. Dead tracts appear black in transmitted and white in reflected ligth

C. Sclerotic transparent dentin appears transparent or light in transmitted light and dark in reflected light

D. All of the above

All of the above

293 - Which of the following is correct?

A. Each rod is formed by 4 ameloblasts

B. Each ameloblast contributes to 4 different rods

C. Head of the rod is formed by one ameloblasts, and tail is formed by three other ameloblasts

D. All of the above

All of the above

294 - Which of the following is least mineralized ?

A. Cementoid

B. Incremental line

C. Cellular cementum

D. Acellular cementum

Cementoid

295 - Which of the following is most important in strength ZOE_____________?

A. Liquid powder ratio

B. Temperature of mixing stab

C. Speed of mixing

D. Addition of few drops of water

Liquid powder ratio

296 - Which of the following is not an ecto-mesenchymal derivative ?

A. Dentin

B. Cementum

C. Pulp

D. Enamel

Enamel

297 - Which of the following is not correct ?

A. In case of pituitary gigantis, all sinuses assume a larger volume than normal

B. In chronic infections, the pain may mimic neuralgia of dental origin

C. Malignant lesions of maxillary sinus produce their manifestations in maxillary teeth

D. None of the above

None of the above

298 - Which of the following is not correct?

A. Free denticles are entirely surrounded by pulp tissue(free of dentin)

B. Embedded denticles are entirely surrounded by dentin (embedded in dentin)

C. Attached denticles are partly fused with dentin

D. False denticles contains many dentinal tubules

False denticles contains many dentinal tubules

299 - Which of the following is not true___________?

A. Alveolar bone proper surrounds the root and gives attachment to fibres of periodontal ligament

B. supporting alveolar bone surrounds the alveolar bone proper and supports the socket

C. The cortical plates are thinner in maxilla than in mandible

D. They are thickest in anterior portion of jaw

They are thickest in anterior portion of jaw

300 - Which of the following is the main constituent of porcelain__________________?

A. Feldspar

B. Kaolin

C. Quartz

D. Clay

Feldspar

301 - Which of the following is true about direct filling gold______________?

A. Properly condensed mat gold has no voids

B. Whatever may be the type voids are inherent

C. Voids can be avoided with manual condensation

D. None of the above

Whatever may be the type voids are inherent

302 - Which of the following is true of cellular cementum ?

A. Forms during root formation

B. Forms after the eruption of the tooth

C. Seen at the coronal portion of the tooth

D. Formation is a slow process

Forms after the eruption of the tooth

303 - Which of the following is true?

A. Cutting cone or resorption tunnel is the area of resorption seen in alveolar bone

B. CAMP or cyclic adenosine monophosphate levels are increased on pressure side of bone and this results in bone resorption

C. Immature born / embryonic bone seen during fracture healing contains less calcified material and greater number of large osteocytes

D. All of the above

All of the above

304 - Which of the following is true?

A. Maxillary sinus communicates with environment through middle meatus and nasal vestibule

B. Maxillary sinus is four- sided pyramid

C. In most of the cases, the main ostium is present in posterior third of hiatus semilunar

D. All of the above

All of the above

305 - Which of the following is true___________?

A. Pulpal pressure is highest among body tissues

B. Majority of nerve that enter the pulp are non myelinated and are sympathetic in nature

C. Plexus of Rashkow or parietal layers of nerves is formed by network of peripheral axons located adjacent to cell rich zone

D. All of the above

All of the above

306 - Which of the following is true_____________?

A. All the bones of upper face develop by intra membranous ossification

B. Incus and malleus develops from mecketls cartilage

C. The third auditory ossicle or stapes develops from 2nd branchial arch

D. All of the above

All of the above

307 - Which of the following is true______________?

A. The uncalcified matrix of cementum is called cementoid

B. Cementum contain type I collagen predominantly

C. Cementodentinal junction is sometimes scallopes in deciduous teeth and smooth in permanent teeth

D. All of the above

All of the above

308 - Which of the following is wrong?

A. The architecture of type I spongiosa is seen in mandible

B. Type II spongiosa is seen in maxilla

C. Condylar process & angle in mandible, and tuberosity in maxilla contain hemopoietic cellular marrow

D. Bundle bone contains a lesser amounts of calcium salts than other types of bony tissue

Bundle bone contains a lesser amounts of calcium salts than other types of bony tissue

309 - Which of the following releases single wavelength of energy ?

A. QTH

B. PAC

C. LED

D. Argon lasers

Argon lasers

310 - Which of the following show chemical bond with enamel (Calcified tissues)______________?

A. Composites

B. Direct filling resins

C. Polycarboxylate cements

D. BIS-GMA resins in pit and fissure sealants

Polycarboxylate cements

311 - Which of the following statement is correct?

A. Enamel cannot form in absence of dentin

B. The formation of enamel and dentin are independent of each other

C. Enamel formation can occur in absence of dentin

D. None of the above

Enamel cannot form in absence of dentin

312 - Which of the following statement is true______________?

A. Cementum is thinnest at CEJ (20-50μm)

B. Cementum is thickest towards the apex (150-200μm)

C. The apical foramen is surrounded by cementum

D. All of the above

All of the above

313 - Which one of the following dental cement accelerates the formation of reparative dentin ?

A. Eugenol

B. Calcium Hydroxide

C. Zinc oxide

D. Silica

Calcium Hydroxide

314 - Which one of the following dental cements does not contain water as part of the composition of the liquid component ?

A. Zinc Phosphate cement

B. Zinc oxide equgenol cement

C. Zinc silicophosphate cement

D. Zinc polycarboxylate cement

Zinc oxide equgenol cement

315 - Which one of the following restorative materials is having coefficient of thermal expansion close to that of tooth enamel and dentin ?

A. Microfilled composite resins

B. Pure gold

C. Silver amalgam

D. Type II Glass ionomer cement

Type II Glass ionomer cement

316 - Which statement is correct about decidous dentition?

A. Calcification of maxillary primary first premolar is completed at birth

B. Mandibular first molar erupts at one and half years of age

C. The crowns of primary dentition are more yellowish than permanent

D. The primary dentition is initiated at 10th month in uterus

Mandibular first molar erupts at one and half years of age

317 - Which type of collagen fibers demonstrates Chicken wire configuration ?

A. Type I

B. Type II

C. Type III

D. Type IV

Type IV

318 - Why GIC is best restorative material in children_____________?

A. High strength

B. Good marginal integrity

C. It can bond enamel & dentin

D. It has less occlusal wear

It can bond enamel & dentin

319 - With respect to their permanent successors the sum of the mesidodistal diameters of the first and second decidous molar is generally ____________?

A. Less

B. Greater

C. The same

D. Not related

Greater

Pages

Subject Wise MCQs

Post Wise MCQs

Past Papers

Pages

Quick Access Resources

Dental Ceramics Most Important MCQs

1 - 1st formed dental tissue______________?

2 - A suitable fixative for a routine biopsy specimen is_____________?

3 - A supernumerary tooth results from a deviation during_____________?

4 - About zinc oxide eugenol all are true except_______________?

5 - Accentuated incremental lines in dentin are______________?

6 - Accentuated incremental lines in dentin due to disturbances in matrix and mineralization process is_____________?

7 - Accessory canals result from____________?

8 - Acellular cementum is typically found in_____________?

9 - Advantage of zinc phosphate over GIC is______________?

10 - Age hardening is a process done at______________?

11 - All factors govering dentine permeability EXCEPT_______________?

12 - All of the following are true for traditional solution liner, except_________________?

13 - All of the following is true about dentinal tubules except______________?

14 - All of the following is used as accelerator in zinc oxide eugenol cement except_____________?

15 - All of the following is used as accelerator in zinc oxide eugenol cement except_______________?

16 - All of the following statements are true for zinc oxide eugenol cements except______________?

17 - Among the difference between teeth in the decidous and the permanent dentition is that_____________?

18 - Any insult to cells in apposition stage result in______________?

19 - At the CEJ cementum overlaps enamel about____________?

20 - At the cemento enamel junction, which of the following occurs_____________?

21 - Atypical or osteodentin is formed due to disturbance during____________?

22 - Average particle size of powdered gold is________________?

23 - Best marginal seal is provided by____________?

24 - Blood supply of ameloblast for most of its life cycle comes form_______________?

25 - Bundle bone is part of____________?

26 - Butt joint in cementoenamel junctions seen is _________% of cases?

27 - Calcified tissue is absent in______________?

28 - Cavity varnishes have_____________?

29 - Cellular cementum and compact bone contain____________?

30 - Cellular cementum is____________?

31 - Cementum formation is seen_______________?

32 - Cementum is_____________?

33 - Cementum that forms in conjunction with root end formation and eruption_____________?

34 - Cementum_____________?

35 - Ceramics fired to metals are processed by_______________?

36 - Cervical bulge. True is____________?

37 - Chemical method of strengthening porcelain involves_________________?

38 - Chemical tempering in porcelains is done to interrupt crack propagation by______________?

39 - Chronic periapical inflammation is usually associated with____________?

40 - Clogging of an abrasive wheel with debris causing reduction of abrasive action is called________________?

41 - Coefficient of thermal expansion of metal-ceramic alloys is________________?

42 - Cohesion of gold foil is an example of______________?

43 - Compared to the inter tubular dentin, peritubular dentin is characterized by which of the following ?

44 - Compared with dental alloys, CERAMICS show____________________?

45 - Condensation shrinkage of porcelain during firing depends on__________________?

46 - Crocus cloth is________________?

47 - Cusp of carbaelli can be considered a normal finding on____________?

48 - Dead tracts in ground section appears as_____________?

49 - Dehydration of specimen is carried out by____________?

50 - Dental lamina is active up to_______________?

51 - Dental papilla gives rise to_____________?

52 - Dental porcelains are crystalline materials of________________?

53 - Dentin formed through out the life is______________?

54 - Dentinal tubules are calcified in_______________?

55 - Dentinal tubules are______________?

56 - Dentinogenesis by odontoblasts first begins at_____________?

57 - Dicor restoration is_______________?

58 - Difference between primary and permanent enamel is_______________?

59 - Direct filling gold formed by electrolytic precipitation is called by all the terms EXCEPT______________?

60 - Dispersion of crystalline phase to strengthen ceramics results in_________________?

61 - Disturbance during the morphodifferentition stage of tooth development will result in______________?

62 - During the development of a tooth, sound coalescence of the lobes results in_____________?

63 - During the formation of primary teeth_______________?

64 - Ectodermal cells in tooth bud are responsible for_______________?

65 - Electralloy is an alloy of________________?

66 - Electrolyte used for plating copper dies is________________?

67 - Enamel pearls are found in_____________?

68 - Epithelial attachment is derived from____________?

69 - Ethoxy benzoic acid increases the strength and solubility of the cement______________?

70 - Eugenol may be replaced in the zinc oxide eugenol cement by______________?

71 - Excess deposition of calcium in the dentinal tubules is referred to as______________?

72 - Extracted teeth should be preserved in_____________?

73 - First appearance of tooth formation occurs in____________?

74 - Fluid flow, in or out of the dentinal tubules is proportional to the tuble diameter by______________?