Objective To analyse clinical effectiveness and periodontal index changes of crown lengthening surgery for molar crown restoration. Methods Choose 26 molar cases whose clinical crown length could rot satisfy the complete coronal restoration requirements, and whose crown prosthesis repeatedly fell off or whose broken biological width lead to gum inflammation, implement crown lengthening surgery,and perform crown restoration 6 weeks after surgery. At different time we observe changes in clinical crown length, record relevant periodontal index and analyse and evaluate clinical effect of the postoperative crown restoration. Results Postoperative clinical crown length had obvious short-term effect. The experiment groups postoperative periodontal index were superior to preoperative index(P<0.05) ,had no obvious difference from index of the control group (P>0.05) .and remained relatively stable in one-year observation period (P>0.05). The retention of crown prosthesis was better, and the margin was fitted well and relatively stable to the margin of gingival. Conclusions For clinical short-crown molars, crown lengthening surgery is an effective method which can improve the full crown repairing effect and promote health of periodontal tissue.%目的 分析牙冠延长术用于磨牙全冠修复的临床疗效及牙周指数变化.方法 选择26颗临床冠长度过小无法满足全冠修复固位要求的磨牙,以及固位不良反复脱落,破坏了生物学宽度造成牙龈炎症的全冠修复失败病例,施以牙冠延长术,术后6周行固定全冠修复.观察不同时段临床冠长度的变化,记录各相关牙周指数并进行分析,评估术后全冠修复的临床效果.结果 术后短期内临床冠长度增加效果确切;试验组术后的各项牙周指数均优于术前(P<0.05),与对照组无明显差异(P>0.05),在1年的观察期内保持相对稳定(P>0.05);全冠修复体的固位良好,边缘密合,龈缘与冠缘的位置关系相对稳定.结论 对于临床冠过短的磨牙,冠延长术是改善全冠修复效果,促进牙周组织健康的有效方法.
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