When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?
Correct answer: D. Impressions made n the custom trays are easier to remove from the mouth
- A. Custom trays facilitate uniform contraction of impression material
- B. Custom trays require less impression material
- C. Stock trays may be short in the flange area
- D. Impressions made n the custom trays are easier to remove from the mouth
Explanation
Custom trays provide uniform material thickness, use less material and avoid the inadequate flange extension sometimes seen with stock trays. They do not necessarily make a set polysulfide impression easier to remove from the mouth, so this is the exception.
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