Two-stage Heat-Shock Procedure Can Fabricate Sound Co-Cr Casting Denture Plates by Using Conventional Phosphate-Bonded Investments

概要

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Our previous report appearing as Snow white (Shofu : the conventional phosphatebonded investment for casting plates) was impossible to apply to a heat-shock method because the mold would explode. In this study we tried to find suitable firing and casting conditions for this investment under a heat-shock procedure. At first we found that the decreasing temperature of heat shock could prevent the mold from expanding. Because we couldn't obtain sound castings from a mold fired at 700°C, we investigated an increase in the soaking time and the firing temperature. We were then able to successfully fabricate the sound Co-Cr full denture plates from the mold that was heat shocked at 700°C for 10 min followed by a secondary heating to 1,000°C with soaking for 30 min. We can conclude that the two-stage heat-shock procedure is available for fabricating a sound Co-Cr casting denture by using conventional phosphate-bonded investments.
昭和大学・昭和歯学会の論文