All Free Dental Materials MCQs with Answers

• A. Is irritating
• B. Encourages pulpal fibrosis
• C. Is sedating
• D. Has no effect

Explanation: Zinc oxide-eugenol is relatively sedative to the pulp because eugenol reduces pulpal nerve activity and inflammation.

• A. Zinc phosphate
• B. Resin
• C. Gutta-percha
• D. Zinc oxide eugenol

Explanation: ZOE provides a good marginal seal because it adapts well to cavity walls and has a low film thickness, making it useful as a temporary…

• A. ZOE
• B. GIC
• C. Ca (OH)2
• D. Zinc polycarboxylate cement

Explanation: ZOE is preferred for temporary restorations because it seals reasonably well, is easy to remove, and has a soothing effect on the pulp.

• A. Increasing mixing time
• B. Adding a drop of water
• C. Cooling the slab
• D. Adding a drop of oleic acid

Explanation: A small amount of water accelerates zinc phosphate cement setting by promoting ionization of the phosphoric acid.

• A. Glass Ionomer Cement
• B. Zinc Phosphate
• C. Silicate cement
• D. Resin cement

Explanation: Silicate cement remains strongly acidic for a prolonged period after placement, with its pH remaining below neutral even after about a…

• A. Zinc phosphate
• B. Zinc oxide eugenol
• C. Calcium hydroxide
• D. Glass ionomer

Explanation: Glass ionomer cement is widely used because it bonds chemically to enamel and dentin, releases fluoride, and is relatively biocompatible.

• A. Bromoglycerine
• B. Zinc acetate dehydrate
• C. Calcium chloride
• D. Acetic acid

Explanation: Acetic acid, zinc acetate and calcium chloride can accelerate the setting of zinc oxide eugenol cement.

• A. Glass Ionomer cement
• B. Zinc phosphate cement
• C. Zinc oxide Eugenol cement
• D. Resin cement

Explanation: A chilled glass slab absorbs heat and slows the exothermic setting reaction of zinc phosphate cement, giving a longer working time.

• A. ZnCl2 + Eugenol
• B. Zn(OH)2 + ZnO
• C. Eugenol + ZnO
• D. ZnCl2 + ZnSO2

Explanation: Zinc chloride and zinc sulfate are listed as soluble salts that accelerate zinc oxide eugenol setting, although the formula written for…

• A. Cementing crowns
• B. Temporary dressing
• C. base
• D. cementing orthodontic bands

Explanation: The frozen slab technique reduces the heat of reaction and extends the working time of zinc phosphate cement used for luting crowns.

• A. ZnO is converted to Zn(OH)2
• B. Dehydrated ZnO reacts with dehydrated eugenol
• C. Water is the byproduct of reaction
• D. Reaction is autocatalytic

Explanation: Zinc oxide eugenol requires moisture for its chelation reaction, producing zinc eugenolate and water; completely dehydrated ZnO and…

• A. Reinforced auto care glass ionomer cement
• B. Compomer
• C. Resin modified glass ionomer cement
• D. Ceramic reinforced glass ionomer cement

Explanation: Resin-modified glass ionomer cement contains a resin phase that polymerizes and gives early protection against water uptake.

• A. High compressive strength
• B. Tensile strength
• C. Diametral strength
• D. High modulus of elasticity

Explanation: Zinc phosphate cement has a higher modulus of elasticity than glass ionomer cement, making it stiffer.

• A. Zinc oxide equgenol cement
• B. Zinc Phosphate cement
• C. Zinc silicophosphate cement
• D. Zinc polycarboxylate cement

Explanation: Zinc oxide eugenol cement uses eugenol as its liquid component, and eugenol is essentially water-free.

• A. Cement tooth interface
• B. Cleavage through the cement layer
• C. Cement prosthesis interface
• D. Fracture of tooth or prosthesis

Explanation: Zinc polycarboxylate cement bonds more strongly to tooth structure than to the restoration, partly through carboxyl groups interacting…

• A. mixing more powder to the liquid
• B. mixing powder to liquid, checked by water
• C. faster addition of powder to liquid
• D. slower addition of powder to liquid

Explanation: Slow addition of powder to zinc phosphate cement allows more heat to dissipate and delays the acid-base reaction, increasing working and…

• A. Benzoic acid
• B. Ethyl alcohol
• C. Phosphoric Acid
• D. None of the above

Explanation: Non-eugenol zinc oxide pastes replace eugenol with an organic acid such as benzoic acid or a substituted benzoic acid.

• A. Zinc polycarboxylate
• B. Zinc phosphate
• C. Polymer reinforced ZOE cement
• D. Glass inomer cement

Explanation: Zinc phosphate cement has the highest modulus of elasticity among these commonly used cement bases, making it relatively rigid.

• 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

Explanation: Varnish seals dentinal tubules and reduces marginal microleakage, limiting movement of fluids that stimulates pulpal nerves.

• A. 2 years
• B. 4 years
• C. 6 years
• D. 8 years

Explanation: Silicate cement restorations have poor resistance to oral moisture and gradual dissolution, so their average clinical life is about four…