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目的:通过获取全瓷冠疲劳可靠性分析中各随机参数的概率分布,以期为构建应力-强度干涉模型及全瓷冠疲劳强度可靠度计算打下基础。方法:通过查阅文献获取日常咀嚼荷载谱、通过获取ShofuVintage材料的S-N曲线,经过曲线拟合得到其应力-寿命曲线方程,根据疲劳极限曲线与Hertzian接触理论,计算得出ShofuVintage瓷材料1,5,10,15,20年的疲劳极限强度95%可信区间。结果:ShofuVintage瓷的应力-寿命曲线方程为ln(load)=ln(684.056)-0.041lnN;ShofuVintage瓷材料1,5,10,15,20年的疲劳极限强度95%可信区间分别为46.941MPa～58.886MPa,45.021MPa～56.619MPa,44.191MPa～55.629MPa,43.726MPa～55.096MPa,43.443MPa～54.657MPa。结论:成功获取了全瓷冠疲劳强度可靠性分析中各随机参数,材料疲劳极限随时间呈下降趋势。
OBJECTIVE: To obtain the probability distribution of the random parameters in the fatigue reliability analysis of all-ceramic crowns, in order to lay the foundation for the construction of the stress-strength interference model and the calculation of the fatigue strength reliability of all-ceramic crowns. Methods: The daily chewing load spectra were obtained by consulting the literature. The SN curve of ShofuVintage material was obtained and the stress-life curve equation was obtained through curve fitting. According to the fatigue limit curve and Hertzian contact theory, the ShofuVintage porcelain materials 1, 5, 10, 15, 20 year fatigue limit strength 95% confidence interval. Results: The stress-life curve of ShofuVintage porcelain was ln (load) = ln (684.056) -0.041lnN. The fatigue limit strength of ShofuVintage porcelain was 95% confidence intervals at 1, 5, 10, 15 and 20 years were 46.941 MPa ~ 58.886MPa, 45.021MPa ~ 56.619MPa, 44.191MPa ~ 55.629MPa, 43.726MPa ~ 55.096MPa, 43.443MPa ~ 54.657MPa. Conclusion: All the random parameters in the reliability analysis of the fatigue strength of the all-ceramic crowns have been successfully obtained, and the fatigue limit of the materials shows a decreasing trend with time.