排龈术用于楔状缺损修复后牙周状况评价

目的评估排龈术用于楔状缺损修复后患牙的牙周状况。方法选择楔状缺损下颌双尖牙138颗，分成A、B两组，A组排龈后再用单组分光固化复合体（Dyract）充填，B组直接Dyract充填，于术前、术后1周、1个月、3个月、6个月分别以菌斑指数、牙龈指数、龈沟出血指数、牙周探诊深度、龈沟液量及龈沟液中天冬氨酸转氨酶水平为指标，评估楔状缺损修复后的牙周状况。结果术前、术后1周及1个月A、B两组所有指标差异均无统计学意义（P〉0．05）；术后3个月及6个月A、B两组菌斑指数、牙龈指数、龈沟出血指数、牙周探诊深度差异无统计学意义（P〉0．05），而龈沟液量、龈沟液中天冬氨酸转氨酶水平差异有统计学意义（P〈0．05，P〈0．01）。结论排龈术用于楔状缺损修复能减少牙周损伤，获得较好的远期疗效。

Clinical evaluation of wedge-shaped defect restored by gingival retraction technique

OBJECTIVE: To evaluate the periodontal conditions after the wedge-shaped defect was restored by gingival retraction technique. METHODS: A total of 138 mandibular premolars with wedge-shaped defect were selected and divided into A, B groups. Group A was restored with Dyract after using retraction cord. Group B was directly restored with Dyract. Clinical parameters including plaque index (PLI), gingival index (GI), sulcus bleeding index (SBI), probing depth (PD), volumes of gingival crevicular fluid (GCF) and levels of aspartate aminotransferases (AST) of gingival crevicular fluid were measured at baseline, 1 week, 1 month, 3 months and 6 months after operation. RESULTS: There was no difference in PLI, GI, SBI, PD between group A and B during 6 months after operation, while the difference of GCF and AST was significant between group A and B at 3 months and 6 months after operation (P < 0.05, P < 0.01). CONCLUSIONS: Gingival retraction technique applied in wedge-shaped defect restoration can reduce the damage to the periodontal tissue.