Which of the following best describes the working time of elastomeric impression material ?
Correct answer: C. Just before the start of appearing elastic properties of impression material
- A. After the start of appearing elastic properties of impression material
- B. Just after the start of appearing elastic properties of impression material
- C. Just before the start of appearing elastic properties of impression material
- D. Loss of luster of impression material
Explanation
Working time extends from the start of mixing until the material begins to develop elastic behavior, so manipulation should be completed just before that transition. Loss of luster is a useful clinical sign for some materials but is not the definition of working time for elastomers.
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