dental02.jpg (11342 bytes)Fundamentals of
Dental Materials

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Gypsum Products, Dental Waxes, and Impression Materials

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Agar-type hydrocolloids become fluid at temperatures much higher than the temperature at which they gel. The temperature range varies slightly from one manufacturer to another. The tube containing the material used in making impressions is placed in boiling water to soften the material. The tube then is stored in a water bath at a temperature of 145o to 155o F (63o to 68o C) until it is needed. Before using the tube, it is "tempered" by cooling it to about 115o F (46o C) so that it will be of a consistency to remain in the impression tray, set quickly, and not be uncomfortable to the patient. Since most brands gel at 97o F (36o C) (slightly below mouth temperature), a water-cooled tray is used. Water at about 70o F (21o C) is circulated through the tray for about 5 minutes to gel the impression.

David L. Heiserman, Editor

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Revised: May 22, 2017