Myers M L, Ergle J W, Fairhurst C W, Ringle R D
Department of Oral Rehabilitation, School of Dentistry, Medical College of Georgia 30912-1260.
Int J Prosthodont. 1994 May-Jun;7(3):253-7.
The purpose of this study was to determine stress corrosion fatigue characteristics of Optec-hsp porcelain. Disks (1 mm thick and 12 mm in diameter) were prepared according to the manufacturer's firing recommendations. Samples were subjected to dynamic loading at multiple constant stressing rates. Dynamic fatigue was measured using a biaxial flexural strength test in a circulating bath. Inert strength was determined in a moisture-free environment. The mean fracture strength for the dry (moisture-free) samples was 167.9 MPa. Linear regression analysis of log fracture strengths vs log time to failure was performed to obtain fatigue parameters. For Optec, the n-value was 26 (SE 1.9) and sigma f0 was 91.3 MPa (SE 1.2 MPa).
本研究的目的是确定Optec-hsp瓷的应力腐蚀疲劳特性。按照制造商的烧制建议制备圆盘（厚1毫米，直径12毫米）。样品在多个恒定应力速率下承受动态载荷。在循环浴中使用双轴弯曲强度试验测量动态疲劳。在无湿气环境中测定固有强度。干燥（无湿气）样品的平均断裂强度为167.9兆帕。对断裂强度对数与失效时间对数进行线性回归分析以获得疲劳参数。对于Optec，n值为26（标准误1.9），σf0为91.3兆帕（标准误1.2兆帕）。
