dental02.jpg (11342 bytes)Fundamentals of
Dental Materials

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Gypsum Products, Dental Waxes, and Impression Materials

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3-22. STRENGTH

The water-powder ratio recommended by the manufacturer must be used. Too little or too much water will weaken the gel. Mixing must be timed. Undermixing may prevent the chemical reaction from occurring evenly, and overmixing may break up the gel. Either can decrease the strength of the material by as much as 50 percent. The strength of alginate-type hydrocolloids increases for several minutes after the initial gelation. Consequently, the impression must not be removed from the mouth for at least 2 or 3 minutes after gelation has occurred.

David L. Heiserman, Editor

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Revised: May 22, 2017