金属烤瓷全冠颈缘修复的临床美学效果评价

目的评价烤瓷全冠颈缘修复的临床美学效果，探讨颈缘变色的原因和预防措施。方法随机选取门诊烤瓷全冠修复2～4年的患者132例，共225件修复体，检查烤瓷冠的颈缘修复效果，对颈缘变色、颈缘密合性及牙龈健康状况的各项指标进行评价。结果53件修复体出现颈缘变色。基牙颈部牙体制备的方式、制备量、烤瓷制作过程及材料的选择与颈缘变色有关。结论正确地选择牙体制备方式，改进烤瓷制作过程，合理地选用基底冠材料，是预防烤瓷冠颈缘变色的关键。

Evaluation of clinical esthetical effect in cervical margin of porcelain-fused-metal crown restoration

Objective To evaluate the clinical esthetical effect in the cervical margin of the porcelain fused to metal crown restoration. Methods 225 cases with the porcelain fused to metal crown were observed. The evaluator examined these restorations for cervical color, marginal fit, and gingival state. Results 53 cases of restoration changed in the cervical color. The method and the tooth preparation volume, the procedure and the material, which were all closely relevant to the cervical color change. Conclusion Usingthe correct method, improving the procedure and choosing the proper material would reduce the cervical color change,