The Reduction of Setting Time of the Magnesia Investment for Casting Titanium

Abstract

In the previous study, it was found that the investment of magnesia cement which was widely used for industrial refractories is much more suitable for casting titanium than the conventional dental casting investments.The purpose of this study is to investigate the method or reducing the setting time of the magnesia investment for using as the convenient material in the usual dental casting method.The addition of potassium phosphate monobasic KH₂PO₄ or sodium bicarbonate NaHCO₃ reduced the setting time of the magnesia investment.The green strength of the magnesia investment also increased by the addition of 1% KH₂PO₄ or 0.5% NaHCO₃.