Question 179 · LDEK · Impressions and impression materials
Which of the following elastomeric impression materials preserve their shape and volume because of an addition-type polymerization reaction?
1) polysulfide elastomers;
2) polymethylsiloxane elastomers;
3) polyvinylsiloxane elastomers;
4) polyether elastomers;
5) vinylsiloxanoether elastomers.
The correct answer is:
2) polymethylsiloxane elastomers;
3) polyvinylsiloxane elastomers;
4) polyether elastomers;
5) vinylsiloxanoether elastomers.
The correct answer is:
- A. 1,2,3.
- B. 2,3,4.
- C. 3,4,5.
- D. 1,2,5.
- E. 2,4,5.
Hint
Addition reactions produce no by-product; identify which elastomers release water or alcohol on setting.
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