中文摘要：

目的：MSP实验法测试氧化铝和氧化锆与饰瓷叠层材料的断裂强度,并与传统三点弯曲试验对比,分析MSP实验法测试牙科陶瓷材料力学性能的可靠性。方法：根据临床方法制作氧化铝和Y-TZP单层和叠层试件,分别用MSP实验和三点弯曲实验测试试件的强度,体式显微镜和电子扫描显微镜观察分析试件断裂特征。结果：各组试件的MSP断裂强度均低于三点弯曲强度,两种强度值大小排列顺序相同,从大至小依次为单层Y-TZP、叠层Y-TZP、单层氧化铝、叠层氧化铝,MSP断裂强度与三点弯曲强度呈对应关系。氧化铝试件断裂没有发生脱瓷和明显的界面破坏,Y-TZP试件断裂时发生脱瓷和界面破坏。结论：根据MSP断裂强度可以反映材料的抗断裂能力,MSP实验法为评价牙科陶瓷材料的强度性能提供了一个简单而有效的方法。

英文摘要：

Objective：To evaluate strength of bi-layer alumina/Y-TZP specimens,compared with 3-point bending test and to estimate the reliability of MSP testing used in dental ceramics.Methods： The single-layer/bi-layer alumina/Y-TZP specimens were produced by the clinical methods.Strength of these specimens was determined by MSP testing and 3-point bending test respectively.Fractured pieces of each bi-layer specimen were collected and studied with optical microscope and SEM.Results： The MSP fracture strength was lower than bending strength in all the specimens.The strength of single-layer Y-TZP was the highest and the strength of bi-layer samples was lower than that of the single-layer samples respectively.Delamination and interface destruction were found in bi-layer alumina specimens,and not in bi-layer Y-TZP specimens.Conclusion： MSP testing is a convenient and feasible method to evaluate mechanical properties of dental ceramics.