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目的：评估排龈术对龈下楔状缺损修复效果的影响。方法选择2008年2月至2009年7月来南京大学医学院附属口腔医院牙体牙髓科就诊的双侧上颌前磨牙颈部楔状缺损患者40例，将同一患者的两侧患牙随机分为排龈组与对照组（各40颗牙），排龈组在排龈线排龈后用Z350复合树脂充填，对照组直接用Z350复合树脂充填。随访2年，观察其临床疗效，评价修复体保存、边缘密合性以及继发龋发生情况。结果充填1周后首次复查，排龈组悬突发生率低于对照组，差异有统计学意义（P〈0.05）。充填1年和2年后复查，排龈组修复体的脱落率均明显低于对照组，差异有统计学意义（P〈0.05）。结论排龈术可提高龈下楔状缺损修复的治疗效果。

Application of gingival retraction cord to the restoration of subgingival wedge-shaped defect

Objective To study the clinical performance of gingival retraction cord in repairing subgingival wedge-shaped defects. Methods Totally 40 patients with wedge-shaped defect on both side premolars were selected, one side treated by gingival retraction and filled with composite resin and the other side filled directly with Z350 compos-ite resin. The marginal adaptation,retention and the presence of secondary carries after one year and two years were eval-uated. Results One week after restoration,the incidence of overhanging for dental restoration by using retraction cord to retract gingival was significantly lower than those of the control group（P〈0.05）. After 1 year and 2 years,the reten-tion of restorations in the control group was significantly lower than that of using retraction cord（P〈0.05）. Conclusion Gingival retraction cord has high success rate for restoration of subgingival wedge-shaped defect.