改良隧道技术治疗牙龈退缩合并非龋性牙颈部缺损的临床研究

目的 探讨改良隧道技术（MTUN）治疗牙龈退缩合并非龋性牙颈部缺损（NCCL）的临床疗效。方法 纳入42颗Miller Ⅰ度牙龈退缩患牙,根据是否伴有NCCL分为NCCL组和对照组,均采用MTUN联合上皮下结缔组织移植进行治疗。记录患牙术前及术后3、6月的牙周探诊深度（PD）、牙龈退缩高度（GRH）、牙龈退缩宽度（GRW）、附着龈宽度（AGW）以及临床附着丧失（CAL）,并计算术后6月的平均根面覆盖率（MRC）。使用美学评分系统记录美学评分。结果 2组患牙术后GRH、GRW、CAL较术前相比均明显减小,PD、AGW未发现明显改变。NCCL组MRC为63.40%±28.02%,对照组MRC为67.00%±21.72%,二者间差异无统计学意义（P=0.815）。2组间术后美学评分无统计学意义。结论 MTUN能够有效改善牙龈退缩问题,较浅NCCL（≤1 mm）的存在不会影响MTUN的手术疗效。

Modified tunnel technique applied in the treatment of gingival recessions with non-carious cervical lesion

Objective This study aimed to investigate the clinical effect of modified tunnel technique (MTUN) in the treatment of gingival recession with non-carious cervical lesion (NCCL). Methods Forty-two teeth with Miller I degree gingival recession were divided into the NCCL group or control group depending on whether NCCL was present. Both groups were treated with MTUN plus subepithelial connective tissue. The periodontal probing depth (PD), gingival recession height (GRH), gingival recession width (GRW), attached gingival width (AGW), and clinical attachment loss (CAL) were recorded before and at 3 and 6 months after operation. The mean root coverage (MRC) at 6 months after operation was calculated and analyzed. A root coverage esthetic scoring system was used to record aesthetic scores. Results GRH, GRW, and CAL of the two groups after surgery were significantly lower than those before surgery, and no significant changes in PD and AGW were observed. The MRC in the NCCL group was 63.40%±28.02%, whereas that in the control group was 67.00%±21.72%; no significant difference between the two groups was found. In terms of aesthetic outcomes, no significant difference between groups was reported. Conclusion MTUN can effectively improve gingival recession, and the presence of shallow NCCL (≤1 mm) will not affect the surgical effect of MTUN.