Department of Oral medicine and Periodontology, Faculty of Oral and Dental Medicine-Cairo University, Manial, Cairo, Egypt.
Department of Periodontics, Dental College of Georgia-Augusta University, Augusta, Georgia.
J Periodontol. 2018 Jul;89(7):815-823. doi: 10.1002/JPER.17-0598.
Lip repositioning is a conservative surgical method for the correction of excess gingival display (EGD) by limiting the upward retraction of the lips. Lip repositioning presents a simple method for the treatment of gummy smile. The aim of this randomized clinical trial (RCT) was to assess lip repositioning, compared to lip repositioning with muscle severance for efficacy in treatment of EGD and resultant stability.
A single-blinded, controlled, parallel-group RCT was performed. Twenty patients with EGD were enrolled in the study, treated with lip repositioning with and without muscle severance. Participants were assessed for EGD reduction, changes in lip length and result stability at 3, 6 and 12 months. Additionally, pain, swelling and satisfaction, were assessed.
Classic lip repositioning was found capable of reducing EGD by 2.73 mm (SD ± 1.281), while lip repositioning with muscle severance offered an improved reduction in EGD with a mean reduction of 3.57mm (SD ± 1.62). Lip length, swelling and pain scores were found comparable between the two techniques.
Lip repositioning is an effective method for treating EGD, however, muscle severance provides a more stable result at 12 months when compared to the classical technique. More studies are necessary to fully assess this procedure.
唇部复位术是一种通过限制嘴唇向上回缩来矫正过多牙龈显露（EGD）的保守手术方法。唇部复位术是治疗露龈笑的一种简单方法。本随机临床试验（RCT）的目的是评估唇部复位术与唇肌切断术在治疗 EGD 及稳定性方面的疗效。
采用单盲、对照、平行组 RCT 方法。将 20 例 EGD 患者纳入研究，分别采用唇部复位术和唇部复位术联合肌切断术治疗。评估患者 EGD 减少量、唇长变化和 3、6、12 个月的稳定性。同时评估疼痛、肿胀和满意度。
经典的唇部复位术可使 EGD 减少 2.73mm（SD±1.281），而唇肌切断术可使 EGD 减少 3.57mm（SD±1.62），效果更佳。两种技术的唇长、肿胀和疼痛评分无显著差异。
唇部复位术是治疗 EGD 的有效方法，但与经典技术相比，唇肌切断术在 12 个月时可获得更稳定的效果。需要进一步研究以全面评估该手术。
