Dental Materials MCQs

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If resin is packed in sandy stage what will be seen in the processed denture?

A.Porosity

B.Distortion

C.Inhomogeneous colour

D.Increased strength

Submitted by: Academy of Pakistan

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The cross linking agent of polysulphide rubber base impression material is________?

A.Lead dioxide

B.Aromatic sulfonate esters

C.Stannous octate

D.Platinum salt catalyst

Submitted by: Academy of Pakistan

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The advantage of unfilled methyl methacrylate is that________?

A.It has a low degree of flow

B.It’s wear resistant is high

C.It can be finished smoothly

D.It’s non-irritation to pulp

Submitted by: Academy of Pakistan

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Mercury is toxic because it________?

A.Inhibits hemoglobin synthesis, producing anemia

B.Complexes with hemoglobinto form methemoglobin

C.Inhibits anaerobic glycolysis

D.Binds to sulfhydryl groups

Submitted by: Academy of Pakistan

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The threshold limit value of mercury exposures is________?

A.0.05 mg / m3

B.mg / m3

Submitted by: Academy of Pakistan

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In porcelain metal elements are embedded in the matrix of________?

A.Rubber matrix

B.Resin matrix

C.Glass

D.Plastic

Submitted by: Academy of Pakistan

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When porcelain is basked against metal, it should possess a________?

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

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

C.high fusion temperature

D.high fusion expansion

Submitted by: Academy of Pakistan

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Ceramics fired to metals are processed by________?

A.Machining

B.Slip casting

C.Heat pressing

D.Sintering

Submitted by: Academy of Pakistan

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Green strength with reference to plaster means________?

A.Dry strength

B.Strength of dental stone due to green colour

C.The wet strength

D.Compressive strength

Submitted by: Academy of Pakistan

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Which one of the following is most elastic?

A.B titanium

B.a titanium

C.Nickel-titanium

D.Chrome-cobalt-nickel

Submitted by: Academy of Pakistan

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Which of the following impression material is elastic________?

A.Impression compound

B.Wax

C.Polyvinyl siloxane

D.Zinc Oxide eugenol (ZOE) paste

Submitted by: Academy of Pakistan

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Phenomenon in which porcelain appears different under varying light condition is________?

A.Opacification

B.Refractive optics

C.Metamerism

D.Translucency

Submitted by: Academy of Pakistan

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Plaster of paris ________?

A.Has porous and irregular crystals

B.Is wet calcined hemihydrate

C.Is a – hamihydrate

D.Has a W / P of 0.2

Submitted by: Academy of Pakistan

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The tow cements which hold with the tooth are________?

A.GIC and polycarboxylate

B.ZnPO4 and silicate

C.GIC and ZnPO4

D.GIC and silicate

Submitted by: Academy of Pakistan

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In method of firing: A shorter firing period at a higher temperature is considered better________?

A.none of these

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

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

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

Submitted by: Academy of Pakistan

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Dental Materials MCQs

If resin is packed in sandy stage what will be seen in the processed denture?

The cross linking agent of polysulphide rubber base impression material is________?

The advantage of unfilled methyl methacrylate is that________?

Mercury is toxic because it________?

The threshold limit value of mercury exposures is________?

In porcelain metal elements are embedded in the matrix of________?

When porcelain is basked against metal, it should possess a________?

Ceramics fired to metals are processed by________?

Green strength with reference to plaster means________?

Which one of the following is most elastic?

Which of the following impression material is elastic________?

Phenomenon in which porcelain appears different under varying light condition is________?

Plaster of paris ________?

The tow cements which hold with the tooth are________?

In method of firing: A shorter firing period at a higher temperature is considered better________?

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