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Dental Materials - 3 Questions
Impression compound
1. has a high coefficient of thermal expansion
2. tends to warp at room temperature
3. is a thermoset material
4. displays higher flow properties when kneaded with water
What is the by-product of the condensation setting reaction in silicone elastomers?1) Water2) Ethyl alcohol3) Carbon dioxide4) Oxygen
The condensation reaction in silicone elastomers produces ethyl alcohol, which evaporates during setting, contributing to the material's contraction.
What is the primary advantage of zinc polycarboxylate cement?1) High thermal conductivity2) Low film thickness requirement3) Chemical bonding with tooth structure4) Fast setting time
Zinc polycarboxylate cement was formulated to have the strength of zinc phosphate and the biological acceptability of zinc oxide-eugenol cements, with the added advantage of chemical bonding to tooth structure.
MCQ