Impression materials mcqs

Q.  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 n the custom trays are easier to remove from the mouth

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