Dental MCQs

A material behaves in certain ways above and below the proportional limit on a stress strin curve, which of the following is correct______________?

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Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic
Above the proportional limit a material functions in an elastic manner, while below the proportional limit it behaves as an plastic
Either A or B
Neither A or B

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Dental MCQs

Above the proportional limit a material function in a plastic manner, while below the proportional limit it behaves as an elastic

Which of the following is correct________________?

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Type I and Type II gold can be heat treated and annealed
Type III and Type IV gold can be heat treated and annealed
Type I and IV gold can be heat treated and annealed
All the type of gold can be heat treated and annealed

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Dental MCQs

Type III and Type IV gold can be heat treated and annealed

Which of the following is present in the powder of the acrylic resin______________?

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Methyl methacrylate
Benzoyl peroxide
Hydroquinone
D-methyl paratolouidine

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Dental MCQs

Methyl methacrylate

Boiling point of methyl methacrylate________________?

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B.P of water
<P of water
Equal of BP of water
Is at normal room temperature

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Dental MCQs

B.P of water

The main advantage of composites over unfilled direct filling resin is their_____________?

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Higher solubility in saliva
Lower modulus of elasticity
Esthetic excellence
Lower thermal co-efficient of expansion

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Dental MCQs

Lower thermal co-efficient of expansion

Composite has_______________?

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Resin
Filler
Resin & Filler
None

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Dental MCQs

Resin & Filler

Acrylic resins are used for______________?

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Anterior restorations
Temporary bridges
Denture base
All of the above

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Dental MCQs

All of the above

To prevent porosity in self-cure acrylic resin, curing should be carried in______________?

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Cold water
Hot water
Under tap water
Under vacuum pressure

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Dental MCQs

Under vacuum pressure

Porosity present in a acrylic denture is usually the result of______________?

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A prolonged curing cycle
Lack of sufficient pressure applied to flask
Insufficient acrylic resin monomer
Prolonged bench cooling after curing

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Dental MCQs

Lack of sufficient pressure applied to flask

Cross linking in denture base resin is contributed by_____________?

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Glycol dimetharylate
Benzoyl peroxide
N-para toluidine
Methyl methacrylate

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Dental MCQs

Glycol dimetharylate