Abstract

A comparison was made of the accuracy of irreversible hydrocolloid impressions made in perforated and nonperforated rimlock trays. The distances between reference points on casts poured in the impressions were compared to those of the same reference points on master casts. The techniques of making impressions and pouring casts were controlled. An analysis of the data indicated no significant difference in impressions made in perforated and nonperforated rimlock trays.

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