自制IPS-Empress2铸瓷快速包埋材料物理机械性能表征

为降低IPS-Empress2铸瓷修复成本,研制了国产化包埋材料,以取代昂贵的进口专用包埋材料.对自制包埋材料的物理机械性能进行表征,与进口材料进行比较和统计分析,并用扫描电镜观察两种材料表面形貌的异同点.结果显示:自制包埋材料的凝固时间为9 min,烧结前密度为1.813 g/cm3,烧结后密度为1.402 g/cm3,开口孔隙率38.1%,凝固2 h后抗压强度和烧结后抗压强度分别为5.42 MPa和8.37 MPa,且耐火度在1000 ℃以上,高于铸造温度(920℃).与进口材料相比,自制包埋材料凝固时间更短,烧结前密度、凝固2h后抗压强度和烧结后抗压强度更高;开口孔隙率、烧结后密度和耐火度无统计学差异.扫描电镜观察显示两种材料结构相似,但自制材料的晶体尺寸略小于进口材料.可见自制包埋材料的主要物理机械性能指标接近或优于进口专用包埋材料,具有良好的临床应用前景.

Characterization of Homemade Fast Investment Materialfor the IPS-Empress2 Castable Ceramic

The aim of this study is to evaluate the physical and mechanical properties of our homemade investment material for the IPS-Empress2 castable ceramic. The IPS specific investment material was taken as control. Results show that the setting time, density before heating, density after heating, rate of open hole, compressive strength at 2 hours after setting and the compressive strength after heating to 920 degrees C of the homemade investment material are 9 minutes, 1.813 g/cm3, 1.402 g/cm3, 38.1%, 5.42 MPa and 8.37 MPa respectively, which are comparable or even better than the specific material. Under the SEM, the crystals of the phosphate hydrate in our homemade material are smaller than those in the special material. Since the physical and mechanical properties of our homemade investment material are comparable or superior to those of the specific material, a conclusion is drawn that it has a promising prospect of future clinical application.