两种不同程序美学牙冠延长术临床疗效对比

Comparison of clinical effects of aesthetic crown lengthening with two different procedures

目的:对比分析两种不同程序美学牙冠延长术的临床疗效。方法:选择因上前牙不良修复体破坏生物学宽度造成牙龈红肿患者20例(102颗牙),随机分为2组:常规程序行牙冠延长(常规组)和即时因循程序牙冠延长(ITCL组)。观察术前及术后各时间点相关牙周指标的变化及修复效果。结果:两组牙周指标术后各时间点较术前均得到明显改善;术后2周时ITCL组出血指数(BI)、菌斑指数(PLI)要优于常规组。术后6个月唇侧冠边缘至嵴顶的距离≥3 mm位点数ITCL组高于常规组,两者间差异有统计学意义(P<0.01)。结论:即时因循牙冠延长术术中牙体预备可有效控制冠边缘至嵴顶的距离,术后即刻临时冠牙龈诱导良好。

Objective： To compare and analyze the clinical effects of aesthetic crown lengthening with two different procedures. Methods： Twenty patients with 102 anterior teeth with gingival edema,due to inappropriate prosthesis damaged biological width were randomly divided into two groups,were treated by conventional crown lengthening and immediate temporization crown lengthening（ ITCL group）,respectively. Periodontal indexes and restorative effects were observed before and after the operation. Results： Both of two groups,the periodontal indexes were significantly reduced at all postoperative time point compared with preoperative time（ P〈0. 05）. After 2 weeks follow-up,the bleeding index（ BI） and plaque index（ PLI） in ITCL group were better than those in the conventional group（ P〈0. 05）. After 6 months follow-up,the percentage of labial sites achieving the proposed obtained distance of 3 mm between crown margin and alveolar bone crest in ITCL group was significant higher than that in conventional group（ P〈0. 01）. Conclusion： Intraoperative teeth preparation in immediate temporization crown lengthening can effectively control the distance between crown margin and alveolar bone crest,and postoperative immediate using temporary crown for gingival remodeling are feasible.