1994 Volume 13 Issue 6 Pages 521-528
The effects of cooling shrinkage and reheating of impressions on the reproducibility of edentulous working models were evaluated.The models were prepared with a single-mix impression technique or putty-wash relining technique, using hydrophilic vinyl silicone rubber impression materials, at room temperature or oral temperature during setting.The models were measured using a three-dimensional measuring system.In addition, impressions made at oral temperature during setting were reheated by 4methods, and the effects of reheating on the reproducibility of models were evaluated.1.In both the single-mix impression technique and putty-wash relining technique, reheating the impressions improved the reproducibility of models.2.In the putty-wash relining technique, the effects of reheating impressions on the reproducibility of models were similar irrespective of the method of reheating.However, in the single-mix impression technique, the effects differed with the reheating method used.
