2751. One of the most important advantages of truly elastic impression material would be its capacity for______________?
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A. Close adaptation to soft tissues

B. Compatibility with gypsum products

C. Reproduction of surface details

D. With drawl without permanent distortion
2753. Finer particle size of silica______________?
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A. Normal setting expansion

B. Greater the hygroscopic expansion

C. No setting expansion

D. Slower the hygroscopic expansion

2754. Finishing and polishing of Amalgam make the restoration______________?
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A. Increased compressive strength

B. Decrease the tarnish and corrosion resistance

C. Increase in tarnish and corrosion resistance

D. Increase the marginal strength

2755. Eugenol may be replaced in the zinc oxide eugenol cement by______________?
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A. Phosphoric acid

B. Acetic acid

C. Ortho-ethoxy acid

D. Alginic acid

2756. Which of the following is true about direct filling gold______________?
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A. None of the above

B. Properly condensed mat gold has no voids

C. Whatever may be the type voids are inherent

D. Voids can be avoided with manual condensation

2757. Over-trituration of silver alloy and mercury_______________?
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A. Increases the strength of lathe cut alloy but reduces the strength of spherical alloy amalgam

B. Gives al dull and crumbly amalgam

C. Reduces contraction

D. Decreases creep

2758. Water powder ratio of dental stone and plaster is respectively_________________?
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A. 0.6 and 3.2

B. 0.28 and 0.6

C. 0.28 and 0.98

D. 0.6 and 0.28

2760. Which is not true about high copper amalgam alloys______________?
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A. High tensile strength

B. Low creep

C. Low Hg: Alloy ratio

D. Low tensile and compressive strength
2761. What is the working time of zinc polyacrylate cement ?
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A. 3 Minutes

B. 1 Minutes

C. 4 Minutes

D. 2 Minutes

2762. A purine which is found in saliva is_______________?
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A. Thymine

B. Uric acid

C. Adenosine

D. Hypolithinium

2764. Porcelain denture teeth________________?
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A. Should be used where the inter dental clearance is small

B. Have a lower abrasion resistance than enamel

C. Have a higher abrasion resistance than gold

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

2765. Which of the following cements is most irritant to pulpal tissues ?
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A. Silicate

B. Polycarboxylate

C. Glass ionomer

D. Zinc phosphate

2766. Accelerators and retarders are used with gypsum products mainly to control_______________?
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A. Setting expansion

B. Setting time

C. None of the above

D. Hardness of the set product

2767. The preferred material for repair of fractured denture base is______________?
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A. Chemically cure resin

B. Light cure resin

C. Vinyl resin

D. Heat curve resin

2768. Which of the following is not correct?
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A. Free denticles are entirely surrounded by pulp tissue(free of dentin)

B. False denticles contains many dentinal tubules

C. Attached denticles are partly fused with dentin

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

2770. Which one of the following dental cements does not contain water as part of the composition of the liquid component ?
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A. Zinc oxide equgenol cement

B. Zinc polycarboxylate cement

C. Zinc silicophosphate cement

D. Zinc Phosphate cement

2771. Condensation shrinkage of porcelain during firing depends on__________________?
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A. Shape and size of particle

B. Type of investment used

C. Uniformity of particle size

D. Rate of arriving at firing temperature

2772. The highest mercury concentration in amalgam filling is found_____________?
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A. None of the above

B. At the margin of the restoration

C. In the deepest part of the restoration

D. In the centre of the restoration

2773. All of the following statements are true for zinc oxide eugenol cements except______________?
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A. Equal lengths of base paste and accelerator paste are mixed together until the mix has a uniform colour

B. Increase in temperature and humidity shorten the setting time

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

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

E. Both C & D
2774. The term trituration means____________?
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A. None of the above

B. Lysing amalgam alloy

C. Removal of excess of mercury

D. Mixing of amalgam alloy and mercury
2775. Which of the following cements is most biocompatible with pulp ?
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A. Zinc oxide eugenol cement

B. Zinc phosphate cement

C. GIC

D. Copper cement

2776. The ? (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
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A. They are more regular in shape and dense

B. They are more regular in shape and highly porous

C. They are more irregular in shape and porous

D. They are more dense and prismatic in shape

2777. Chemical tempering in porcelains is done to interrupt crack propagation by______________?
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A. Transformation toughening

B. All of the above

C. Dispersion of crystalline phase

D. Inducing residual compressive strength
2778. Why GIC is best restorative material in children_____________?
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A. It can bond enamel & dentin

B. It has less occlusal wear

C. High strength

D. Good marginal integrity

2779. Moisture contamination of amalgam can lead to_____________?
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A. Delayed expansion

B. Shrinkage

C. increased stresses

D. Marginal breakdown

2780. Cavity varnishes have_____________?
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A. Average bonding to tooth

B. Excellent bonding to tooth

C. No bonding to tooth

D. Low bonding to tooth

2782. Sublingual gland is a_____________?
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A. Present in root of tongue

B. Mixed gland

C. Mucous gland

D. Serous gland

2784. Which of the following is true_____________?
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A. All the bones of upper face develop by intra membranous ossification

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

C. All of the above

D. Incus and malleus develops from mecketls cartilage

2787. Which of the following cements have anti cariogenic properly________________?
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A. Zinc silicophosphate

B. Zinc phosphate

C. Calcium Hydroxide

D. ZOE

2788. In spherical alloys as compared to lathe cut____________?
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A. Less condensing force is required

B. More condensing force is required

C. Both require same condensing force

D. Manipulation is easy

2789. Which cement is irritating to the pulp ?
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A. Zinc oxide-eugenol cement

B. Zinc phosphate

C. Carboxylate cement

D. Ethoxybenzoic acid

2790. In plaster of paris the setting time is primarily altered by_________________?
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A. Speed and length of hand spatulation

B. Addition of accelerators and retarders

C. Altering temperature of mixing water

D. Altering P / L Ratio

2792. For dental amalgam, the elastic modulus and tensile strength is______________?
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A. 350 Gpa and 10 120 Mpa

B. 360 Gpa and 125 130 Mpa

C. 21 Gpa and 27 55 Mpa

D. 40 Gpa and 60 100 Mpa

2793. Carmalts glands are______________?
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A. Taste Buds

B. Major salivary glands

C. Minor salivary gland ( lingual)

D. Minor salivary glands (Retromolar)
2794. Increase in the residual mercury in silver amalgam filling can_____________?
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A. Tarnish and corrosion

B. Decrease condensation pressure

C. Increase the strength

D. Cause fracture of the filling
2795. Which of the following show chemical bond with enamel (Calcified tissues)______________?
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A. Polycarboxylate cements

B. Direct filling resins

C. BIS-GMA resins in pit and fissure sealants

D. Composites

2796. MEchanism of adhesion of GIC restoration with tooth surface is by mean of ______________?
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A. Carboxyl group

B. Polymer chains

C. Chelates with Metal Ions

D. C=C double bond

2797. The malleting force is directed______________?
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A. 45 to the wall

B. None of the above

C. Parallel to long axis of crown

D. Perpendicular to the walls

2799. Modiffiers are added to gypsum mainly to_______________?
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A. Modify setting expansion

B. Modify setting time

C. Modify strength

D. Decrease the porosity

2800. For porcelain fused to metal crown, the porcelain should have ______________?
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A. High fusion temperature

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

C. High fusion expansion

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