Purk J H, Willes M G, Tira D E, Eick J D, Hung S H
Department of Operative Dentistry, University of Missouri-Kansas City School of Dentistry 64108, USA.
J Am Dent Assoc. 1998 Jul;129(7):1014-21. doi: 10.14219/jada.archive.1998.0356.
While being shipped to a laboratory, impressions can be exposed to excessive temperatures. This study compared the effects of different time and temperature storage conditions, including temperature extremes of 66 C and -10 C, on the accuracy of addition silicone and polyether impressions. The greatest distortion generally occurred as a result of the 66 C temperature extreme. The authors recommend that impressions be poured in stone according to manufacturers' specifications before being shipped to a dental laboratory.
