Gypsum Products
Read And Learn More: Basic Dental Materials Notes
Tests for measuring setting time
- Initial Gillmore test for the initial set
- Vicat test for setting time
- Gillmore test for final setting time
Accelerator: Decreases setting time
Example:
- NaCl in small concentration, gypsum < 20%
- K2SO4 is commonly used.
Retarder:
- Increases setting time
- Glue, gelatin, borax, potassium citrate
- NaCl in high concentration.
Normal setting expression: Setting expansion without water immersion Hygroscopic setting expansion: Expansion that occurs under water.
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