| 摘要 |
PROBLEM TO BE SOLVED: To provide dental plaster powder that has flowability, a hardening time and a strength of a hardening body suitable for dentistry in order to make a dental model by being kneaded with water and used.SOLUTION: Dental plaster powder is provided by blending 2-4 pts.wt. of dihydrate plaster, 0.5-3 pts.wt. of potassium sulfate, and 0.05-0.8 pts.wt. of polycarboxylate-based water reducer to 100 pts.wt. of hemihydrate plaster, not containing other additives of more than 0.3 pts.wt. in total. More preferably, the blending amount of the polycarboxylate-based water reducer may be 0.15-0.3 pts.wt. to 100 pts.wt. of the hemihydrate plaster, and the blending amount of the potassium sulfate may be 25% by weight or more to equal to that of the dihydrate plaster. |
