Abstract
A thermoplastic impression material Adaptol (J. F. Jelenko & Co.) is used for the impression of denture and has attained good results. But the accuracy of the impression material is not distinct.
The purpose of this study was to investigate the influence of handling temperature on dimensional accuracy of the impression material.
Part 1. Impressions were made with Adaptol and custom trays. Accuracy of the impression material was determined by measurement of impressions kept in water at 5, 10, 15, 20, 25 and 30°C.
Part 2. After pouring the stone, impressions were placed into water for cooling or left in air. The temperature of water were 5, 10, 15 and 20°, and the temperature of air was 25°C. Stone casts were made with each temperature. Accuracy of the impression material was determined by measurement of stone casts made from impressions.
The following results were obtained.
1. Changing the temperature of water for keeping, impressions also changed its size. Using water at 20°C for keeping, the impression material indicated best accuracy.
2. As there was no significant difference between measured values of stone casts, the heat evolved at the setting of the stone indicated no influence on accuracy of the impression material.
