排龈技术在牙体缺损修复中的应用

目的观察排龈对3MZ250复合树脂修复牙体缺损疗效的影响。方法选择31例120颗唇颊面牙颈部龋缺损牙，随机分为实验组和对照组，每组60颗，经窝洞预备后，实验组排龈线排龈后3MZ250复合树脂修复，对照组直接树脂修复，随访2年，评价修复体保存、继发龋以及边缘密合状况。结果充填后1周复查，使用排龈线组修复后悬突的发生率低于对照组，差异有显著性（P〈0．01）。充填后0．5年复查两组脱落率无明显差异；1年及2年后复查实验纽充填体的脱落率明显低于对照组（P〈0．05）。结论排龈可提高3MZ250复合树脂修复牙体缺损的修复体保存率，可以作为一项常规使用措施。

Clinical performance of using gingival retraction cord and composite resin for dental restoration

Objective To study the clinical performance by using gingival retraction cord and complex resin for dental restoration after two years.Methods One hundred and twenty teeth with dental caries or defects of 31 patients were selected. The teeth were divided into 2 groups randomly. In group 1, dental caries were removed and cavities were prepared routinely, and filled with composite resin after using retraction cord to retract gingival. In group 2, caries were removed and filled directly. The marginal adaptation, retention and the presence of secondary caries after six months, one year and two years were evaluated.Results One week after restoration, the incidence of overhanging dental restorations by using retraction cord to retract gingival were significantly lower than those of the control group (P＜0.01). After 6 months, statistical analysis showed no differences between the two groups in the retention of restorations (P＞0.05). However, after 1 year and 2 years , the retention of restorations in the control group was significantly lower than that of using retraction cord (P＜0.05).Conclusion Gingival retraction cord has high successful rate of composite resin for restoration of dental caries or defects.