DEVELOPMENT OF DENTAL PORCELAIN MATERIAL PRODUCED UNDER MILD CONDITION OF LOW TEMPERATURE AND PRESSURE

以氧化镁和磷酸二氢铵为凝固材料，瓷粉为芯材的混合物加热温度为700℃，该温度低于本研究瓷粉的熔合温度。此外，在陶瓷中加入长度为10 ~ 20 μ m、直径为0.3 ~ 1.0 μ m的晶须，有利于提高陶瓷的抗弯强度。用含2 wt%或4 wt%钛酸钾（PT）晶须的氧化锆溶液（ZP）处理后的瓷粉陶瓷的抗弯强度均较高。PT晶须的添加对ZP陶瓷的耐磨性没有影响。含有PT晶须的ZP陶瓷表面粗糙度略有提高。然而，用这种材料制成的镶嵌体的适合度很差。

The heating temperature of a mixture of magnesia and ammonium dihydrogenphosphate as setting materials and porcelain powder as core is 700ﾟC,the temperature was lower than the fusing temperature of the porcelain powder using this study. Furthermore, it was suggested that addition of whisker of 10-20 mum in length and 0.3-1.0 mum in diameter was very useful for improvement of bending strength of the ceramics prepared. The bending strength of the ceramics consisted of porcelain powder treated with zirconia solution (ZP) containing 2 or 4 wt% potassium titanate (PT) whisker showed excellently high. Addition of PT whisker did not affect on the wear-resistance of ZP ceramics. The surface roughness of ZP ceramics containing PT whisker increased slightly. While, the fitness of the inlay formed from this material was poor.