目的 分析椅旁CAD/CAM系统(CEREC(R))全瓷修复病例的失败原因,以期提高临床成功率.方法 收集行椅旁CAD/CAM全瓷修复病例资料1129例,通过临床检查和瓷睿刻生物再造软件,对其中失败病例的修复类型和失败原因进行研究,并对结果 进行统计学分析.结果共有61例失败的椅旁CAD/CAM全瓷修复体,失败率为5.4%.失败病例的修复体类型为,嵌体10例,高嵌体38例,嵌体冠2例,全冠11例.失败形式表现为,修复体折裂33例、修复体失粘结13例、基牙折裂15例.失败原因主要为咬合面瓷层厚度不足、预备体线角过锐,牙体缺损过多,以及基牙预备时抗力、固位设计不佳.结论 咬合面瓷层厚度不足是椅旁CAD/CAM全瓷修复失败最常见的原因.%Objective To investigate the failure reasons of all-ceramic restorations fabricated with chair-side CAD-CAM technology (CEREC(R)) and to improve the clinical survival of all-ceramic restorations. Methods All-ceramic single-tooth restorations of CEREC(R) in stomatology hospital of Jiangsu province between 2013 and 2016 were summarized. By clinical examination and CEREC Biogeneric surveying, the failure reasons and related restoration types were evaluated. These results were analyzed with Chi-square test and Spearman correlation analysis. Results A total of 61 cases with restoration types of 11 inlays, 38 onlays, 2 endocrowns, and 11 all-crowns, resulted in a failure rate of 5.4%in all-ceramic single-tooth restorations in 1-4 years follow-up. The reasons for failure included ceramic fracture (n=33), debonding (n=13), tooth fracture (n=15), which attributed to thin ceramic thickness (n=27), acute line angle (n=6), insufficient enam-el bulk (n=3), insufficient retention type (n=10), insufficient resistance type (n=15). Conclusion The most common reason for failure in CEREC(R) restorations was insufficient preparation space in occlusal surface.
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