可切削的氧化锆陶瓷牙科修复体的制备

Preparation of Machinable Zirconia Ceramics as a Dental Prosthetic Material

通过控制CaO_2-Al_2O_3-SiO_2硅酸盐玻璃粉体,在1300℃低温下液相烧结获得热膨胀系数在7.19×106/℃和8.15×10-6/℃范围内,与修复体饰瓷相近,其强度在340～360MPa,韧性在2.7～3.5 MPa·mI/2,可切削性与In-Ceram相当的氧化锆陶瓷牙科修复体.

The zirconia ceramic as a dental prosthetic material was prepared by liquid-phase sintering with Ca02-Al2O3 -SiO2 glass as the sintering aid. And the bending strength, fracture toughness, thermal expansion and machinable property of the sintered bodies were valued. The results obtained show that (1) CaO2-Al2O3-SiO2 glass is effective to lower the sintering temperature of zirconia ceramic to 1300℃; (2) the machinability of the dental prosthetic zirconia ceramic is comparable to that of In-Ceram; (3) its thermal expansion coefficient is 8.15-7.19×10-6/℃, bending strength is 360-340MPa and fracture toughness is 3.5-2.7MPa·m1/2.