不同排龈方法在修复龈下楔状缺损临床研究

目的评估不同排龈方法修复龈下楔状缺损的临床疗效。方法选择颈部边缘位于龈下0—2ram内较难充填的楔缺共150例，随机分为3组，每组50例。分别使用不含药排龈线、含药排龈线和Expasyl排龈膏排龈，树脂充填。治疗后记录牙龈出血（BOP）和患者主观感受，1年后随访，记录牙龈指数（GI），以改良的直接USPHS临床评价系统评估疗效。结果随访1年后各组病例修复体均无脱落，两排龈线组与排龈膏组的充填后疼痛发生情况和牙龈出血率的差异有统计学意义，而在充填体脱落、边缘密合性、继发龋、边缘着色四方面组间差异均无统计学意义。结论三种方法在修复龈下楔状缺损时均可以获得良好稳定的排龈效果，排龈膏排龈法患者疼痛反应小，出血少，值得推广应用。

Clinical study of three gingival retraction methods in subgingival non- cariouss cervical lesions

Objective To evaluate the clinic effect of three gingival retraction methods in subgingival non carious cewi cal lesions. Methods Totally 150 teech with wedge shaped defects at subgingival depth of 0 2ram were selected and derided into 3 groups. Each group was treated with pure cord（Ultrapak） , cord with HCL epinephrine （Ultrapak）and a paste like material（Expasyl） respectively on the buccal aspects. Bleeding on probing and the pain were assessed after application. The retention, marginal adaption, marginal coloration, the presence of secondary carise and G1 after one year were evaluated. Results There were no significant difference in main indexes including retention, marginal adaption, marginal coloration ,the presence of secondary carise and GI（ P 〉 0.05 ）. The difference among three groups in bleeding on probing and the pain were of statistical significance （ P 〈 0. 05 ）. Conclusion The three gingival retraction methods could achieve satisfactory clinical effect. The Expasyl paste could provide hemostasis effect and less pain, is worthy of popularization and application.