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Dental Materials Requirements

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Questions and Answers

What is the ideal flow characteristic for a cement mix used for cementation?

Low flow (high viscosity)

Moderate flow (medium viscosity)

No flow (extremely high viscosity)

High flow (low viscosity) (correct)

What is the effect of fine powder particles on film thickness?

Increases film thickness

Makes the film thickness unpredictable

Has no effect on film thickness

Decreases film thickness (correct)

What happens to film thickness when more pressure is applied during cementation?

Increases

Becomes unpredictable

Decreases (correct)

Remains the same

Why is solubility undesirable in a cement used for final cementation?

It leads to marginal leakage and recurrent caries Signup and view all the answers

What is the purpose of an obtundent effect in a cement?

To relieve pulpal pain and irritation Signup and view all the answers

What is a desirable property of a cement when used as a temporary filling?

Solubility in saliva Signup and view all the answers

What is the primary function of luting agents in dentistry?

To bond or unite crowns, bridges, and orthodontic brackets to natural teeth Signup and view all the answers

What is a key biological requirement of an ideal dental cement?

Biocompatibility Signup and view all the answers

What is an important rheological property of dental cements?

Film thickness Signup and view all the answers

In addition to luting agents, what is another application of dental cements?

All of the above Signup and view all the answers

What is a critical mechanical property of dental cements?

Mechanical strength Signup and view all the answers

What is cementation in dentistry?

The bonding or uniting of two or more materials with cement Signup and view all the answers

What is the purpose of adding ethoxybenzoic acid to ZnO/E cement?

To accelerate the setting reaction Signup and view all the answers

Why is conventional Zinc oxide/eugenol cement contraindicated under amalgam restoration?

Due to its highly exothermic setting reaction Signup and view all the answers

What is the key to extending the working time of zinc phosphate cement?

Mixing the powder and liquid in small increments Signup and view all the answers

What is the ideal surface to mix zinc phosphate cement on?

A cold glass slab Signup and view all the answers

What is the purpose of keeping the liquid in a tightly closed bottle?

To prevent the liquid from gaining water Signup and view all the answers

What is the effect of an exothermic reaction on the setting time of zinc phosphate cement?

It accelerates the setting reaction Signup and view all the answers