GI-Ⅱ型渗透陶瓷断裂韧性测试

Determination of the fracture toughness of GI-Ⅱinfiltrated ceramic

目的:测试并比较GI-Ⅱ型渗透陶瓷和In-ceram的断裂韧性和硬度。方法:制备GI-Ⅱ型渗透陶瓷和In-ceram圆盘形试件,研磨抛光。在维氏硬度仪上测试断裂韧性和硬度。断裂韧性数据采用Weibull分析。结果:GI-Ⅱ型渗透陶瓷和In-ceram的断裂韧性和硬度分别是3.05±0.06MN·m^(-1.5),12.66±0.33GPa和3.86±0.25MN·m^(-1.5),14.63±0.43GPa。Weibull 模数分别是46.93和15.00。结论:GI-Ⅱ型渗透陶瓷的断裂韧性和硬度比In-ceram低,但明显高于其它传统牙科陶瓷,而且其较高的Weibull模数表明其较好的材料均质性。

Objective: This study was to compare fracture toughness and hardness of GI-ⅡInfiltrated Ceramic and In-ceram using indentation method. Methods: GI-II infiltrated ceramic and In-ceram disks were fabricated and polished. Their fracture toughness and hardness were determined with Vicker's indentation test machine. The fracture toughness data was processed by Weibull analysis. Results: The fracture toughness and hardness were 3.05±0.06MN·m-1.5 and 12.66±0.33GPa for GI-ⅡInfiltrated Ceramic, 3.86±0.25MN·m-1.5 and 14.63±0.43GPa for In-ceram. The Weibull Modulus of the fracture toughness was 46.93 and 15.00, respectively.Conclusion: GI-ⅡInfiltrated Ceramic is lower in fracture toughness and hardness than In-ceram, but much higher than many other traditional dental restorative ceramics and its higher Weibull modulus indicate better homogeneity.