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目的:考察渗透陶瓷与饰面瓷双层结构的双轴抗弯强度及其可靠性和断裂方式,以帮助了解修复体失败的原因。方法:制作1.6mm×16mm盘状试件40个,MC和MV分别为渗透陶瓷和饰面瓷的单层试件,BV和BC为两者的双层试件,采用球-环法测定以上4组的双轴抗弯强度,其中BV组在加载时饰面瓷承受张应力,BC组加载时渗透陶瓷承受张应力。结果用SPSS13.0软件包行单因素方差分析及Weibull分析,体视显微镜及扫描电镜观察确定试件断裂源及断裂模式。结果:MC组强度最高(P<0.001),BC组强度高于BV组(P<0.001),MV组与BV组双轴抗弯强度无统计学差异(P=0.381)。Weibull模量主要受承受张应力一侧的材料影响,BC组与BV组都未发生明显的界面剥离。结论:加载时,承受张应力的材料决定双层试件的双轴抗弯强度和断裂模式。强度较差的饰面瓷会影响全瓷修复体的强度。
OBJECTIVE: To investigate the biaxial flexural strength, reliability and fracture mode of infiltrated ceramic and veneered porcelain double-layer structure to help understand the reason of prosthetic failure. Methods: 40 disks of 1.6mm × 16mm were prepared. MC and MV were single-layer specimens of infiltrated ceramic and veneer porcelain, BV and BC were both double-layer specimens. The ball- 4 groups biaxial flexural strength, which BV group in the loading porcelain to withstand tensile stress, BC group to load when the ceramic to withstand tensile stress. Results One-way analysis of variance (ANOVA) and Weibull analysis (SPSS 13.0) software package were used to determine the source of fracture and the mode of fracture in the specimens by stereomicroscope and scanning electron microscope. Results: The intensity of MC group was the highest (P <0.001). The strength of BC group was higher than that of BV group (P <0.001). There was no significant difference in biaxial bending strength between MV group and BV group (P = 0.381). The Weibull modulus is mainly affected by the material on one side of the tensile stress, and no obvious interface debonding occurs between BC and BV groups. Conclusion: When loaded, the biaxial bending strength and fracture mode of the double-layer specimens are determined by the material subjected to tensile stress. Less strength porcelain will affect the strength of all-ceramic restoration.