Zhen M, Wang C, Hu W-J, Zhang H, Li L-S, Wei Y-P, Chung K-H
Department of Periodontology, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China.
Department of Prosthodontics, Peking University School and Hospital of Stomatology, National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing Key Laboratory of Digital Stomatology, Beijing, China.
Br Dent J. 2017 Jan 13;222(1):21-25. doi: 10.1038/sj.bdj.2017.25.
Objectives To evaluate long-term outcomes of modified crown lengthening procedures for crown-root fractured teeth, and to analyse factors that affect the periodontal health of the treated teeth.Methods The present study retrospectively analysed data from 22 patients (13 males and 9 females) who had presented with crown-root fractured teeth and received modified crown lengthening procedures combined with crown restoration for ≥13 months. In total, 26 crown-root fractured teeth were treated and examined for plaque index, probing depth, bleeding index, bleeding on probing, mobility and the crown margin location. The contralateral tooth and ipsilateral teeth mesial and distal to the treated tooth were used as controls. Data were assessed descriptively or analysed statistically with Mann-Whitney-U test at α=0.05.Results Recorded periodontal indices revealed stable periodontal status in 25 of 26 treated teeth with the mean values for aesthetic and functional VAS scores at 9.5. A negative correlation was observed between the subgingival crown margin location and the bleeding index.Conclusions The modified crown lengthening procedure is a feasible and minimally invasive therapeutic option for management of crown-root fractured cases.
目的 评估改良牙冠延长术治疗冠根折牙的长期效果，并分析影响治疗后牙齿牙周健康的因素。方法 本研究回顾性分析了22例（男13例，女9例）冠根折患者的数据，这些患者接受改良牙冠延长术联合牙冠修复≥13个月。共治疗26颗冠根折牙，并检查菌斑指数、探诊深度、出血指数、探诊出血、松动度及牙冠边缘位置。以对侧牙及患牙近远中邻牙作为对照。数据采用描述性评估或进行统计学分析，采用Mann-Whitney-U检验，α = 0.05。结果 记录的牙周指数显示，26颗治疗牙中的25颗牙周状况稳定，美观和功能VAS评分平均值为9.5。龈下牙冠边缘位置与出血指数之间存在负相关。结论 改良牙冠延长术是治疗冠根折病例的一种可行且微创的治疗选择。
