牙冠延长术用于前牙冠修复的牙周指标分析

目的：评价牙周基础治疗及牙冠延长术治疗前牙不良冠修复所致牙周病的临床疗效。方法：选取30例前牙冠修复所致牙周病患者共105颗患牙，均采用牙周基础治疗及牙冠延长术后再行冠修复，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，治疗组术后的各项牙周指数均优于术前（P＜0．05），与对照组比较无明显差异（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：牙周基础治疗及牙冠延长术有利于不良冠修复所致牙周病的治疗，且冠延长术解决了生物学宽度的问题，确保了牙周健康的长期稳定。

Periodontal index analysis of crown lengthening surgery for anterior teeth crown restoration

Objective：To evaluate the clinical effect of initial therapy and crown lengthening surgery on anterior teeth involved with periodontal disease after crown restored. Method：Initial therapy and crown lengthening surgery were applied to 105 anterior teeth of 30 cases. After treatment all teeth were restored by crowns. 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. Result：Postoperative clinical crown length had obvious short-term effect.The experiment group＇s 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 bet-ter,and the margin was fitted well and relatively stable to the margin of gingival. Conclusion：Crown lengthening surgery solved the problem of biologic width. Therefore,right selection of indications,initial therapy,crown lengthening surgery and accurate restoration design contribute to the treatment of periodontal disease caused by crown.