【摘要】 目的:评价超声骨刀行牙冠延长术对保留牙体缺损位于龈下3 mm以内、厚龈生物型前牙的临床疗效。方法:纳入厚龈生物型前牙肩台、龋坏或折裂位点位于龈下3 mm以内的患者20例。行必要的牙周基础治疗和根管治疗后随机分为两组,实验组10例29个患牙,采用超声骨刀去骨行冠延长术;对照组10例34个患牙,采用高速涡轮手机去骨行冠延长术。测量术前和术后4、8周、6月龈沟出血指数(SBI)、菌斑指数(PLI)及术后6月牙龈退缩率,并记录手术所需时间。结果:术后4、8周,实验组SBI和PLI均低于对照组(P<0.05),6月时两组SBI和PLI无显著差异(P>0.05);术后6月实验组均无牙龈退缩,对照组7个牙有0.5~1.0 mm的牙龈退缩,两组相比P<0.05;实验组平均手术时间多于对照组(P<0.05)。结论:采用超声骨刀行牙冠延长术对保留牙体缺损位于龈下3 mm内的厚龈生物型前牙,具有比传统方法更好的临床疗效。更多还原

【Abstract】 AIM: To evaluate the clinical effect of piezosurgery in crown lengthening of anterior teeth with thick gingival biotype. METHODS: 20 patients with 63 anterior tooth defects 3 mm below gingiva and with thick gingival biotype were included. After periodontal non- surgical treatment and root canal therapy,the patients were randomly divided into 2 groups. The crowns were lengthened with piezosurgery in experimental group( 10 patients with 29 teeth) and high- speed air turbine in control group( 10 patients with 34 teeth) respectively. Surgery duration was recorded. Sulcus bleeding index( SBI) and plaque index( PLI) were measured before surgery and 4weaks,8 and 6 months after surgery. Gingival recession( GR) was measured at 6 months after surgery. RESULTS: Duration of surgery( min / tooth) in experimental and control group was 17. 0 ± 1. 87 and 9. 90 ± 1. 53 respectively( P < 0. 05). SBI and PLI at 4 and 8 week after surgery in piezosurgery group were lower than those in control group( P < 0. 05),while at 6 month after surgery were not statistically different between groups( P > 0. 05). GR was observed in 7 teeth of control group 6 month after surgery,but not observed in experimental group( P < 0. 05). CONCLUSION: Piezosurgery is more effective than high-speed air turbine in the treatment of anterior teeth with thick gingival biotype.更多还原