Dental When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except 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 in the custom trays are easier to remove from the mouth 💡 Explanation 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 in the custom trays are easier to remove from the mouth