目的:探讨单侧Gillies扇形瓣结合口周肌群重建修复鳞癌切除术后下唇缺损的临床效果。方法:2017年2月至2020年1月，厦门大学附属第一医院耳鼻咽喉头颈外科收治8例下唇鳞状细胞癌患者，男2例，女6例，年龄55～81岁，平均62.9岁，采用单侧Gillies扇形瓣结合口周肌群重建的方法修复鳞癌切除术后下唇中度缺损。设计Gillies扇形瓣所包含的上唇唇红长度为下唇缺损唇红长度的1/3，制备以对侧上唇动脉-同侧上唇动脉-面动脉口角段-同侧下唇动脉供血的轴型复合组织瓣，旋转修复下唇缺损。解剖时留存口周各辐射肌群断端备用，恢复口轮匝肌连续性后，在重建口唇对应处固着各口周辐射肌止点。术后行口周肌群肌力训练，待口唇唇长和形态趋于稳定后，进行测量、计算，评价唇外观、张口功能、闭合功能。结果:本组8例患者上、下唇唇红长度平均52.4 mm(46.0～60.0 mm)；口唇唇红周长平均104.8 mm(92.0～120.0 mm)，下唇缺损范围平均27.6 mm(21.0～35.0 mm)，占下唇唇红52.5%(42.0%～67.3%)，使用右侧Gillies扇形瓣6例，左侧2例，包含唇红长度平均9.5 mm(7.0～12.0 mm)。术后无感染、出血、血肿等手术并发症发生，切口愈合好，瘢痕相对不明显，存在不同程度下唇麻木感；随访6个月，唇癌无局部或远处复发，下唇麻木感逐渐消失。根据术前及术后6个月测量结果进行评价：(1)唇外观：所有病例术后口唇形态自然，居中对称，两侧口角基本水平对称。上、下唇唇长有不同程度延长，上唇平均增加量6.8 mm，增加率15.9%；下唇平均增加量15.4 mm，增加率45.3%；静息时口唇唇红周长较术前平均减少5.5 mm，为术前周长94.9%，基本恢复术前水平。(2)张口功能：所有病例术后1周张口形为偏斜类圆形，张口度约1.5横指，术后6个月，张口形呈基本对称类圆形，张口度3横指；最大张口时口唇唇红周长较术前平均减少46.5 mm，为术前最大张口周长73.1%，基本满足生理需要。(3)闭口功能：所有病例均能完全闭口，言语功能完整，发闭唇音、吹口哨时无漏气现象；咀嚼、吞咽时无口角歪斜、下唇流涎现象。所有患者均对口唇动、静态外形和张、闭口功能表示满意。结论:单侧Gillies扇形瓣结合口周肌群重建是一种良好的一期修复唇癌切除术后下唇中度全层缺损的方法，再造口角形态自然，口唇对称性良好，可获得充足的张口度和良好的张口形态。“,”Objective:To study the clinical effect of dynamic reconstruction of lower lip defect after squamous cell cancer resection by using unilateral Gillies fan flap and perioral muscle restoration.Methods:From Feburary 2017 to January 2020, 8 patients (6 female and 2 male, aged 55-81, 62.9 in average)diagnosed lower lip squamous cell carcinoma were accepted treatment in the Department of Otolaryngology Head & Neck Surgery, the First Affiliated Hospital of Xiamen University. All the moderate lower lip defect after cancer resection were repaired with unilateral Gillies fan flap with perioral muscle restoration under general anesthesia. The length of the vermilion of the upper lip in the Gillies fan flap was designed to be 1/3 of the length of the vermilion of the lower lip defect. The composite axial flap was prepared with the blood supply from contralateral upper lip artery-ipsilateral upper lip artery-mouth corner part of facial artery-ipsilateral lower lip artery.The end of all the perioral muscles were also prepared. After reconstruction of the continuity of the orbicularis oris, the ends of these perioral radiation muscles were restored in the position where they should be in the reconstructed lip.These perioral muscles training were undergone for 6 months after operation. After the reconstructed lip tend to be stable, measurement and calculation were carried out to evaluate the appearance, opening and closing functions of the mouth.Results:In our series of 8 cases, the length of the vermilion of the upper/lower lip was 52.4 mm(46.0-60.0 mm) in average; the circumference of the vermilion was 104.8 mm(92-120 mm)in average; the length of the defect of lower lip was 27.6 mm (21.0-35.0 mm)in average, 52.5% (42.0-67.3%) of the vermilion of lower lip. Six cases were using the right-side flap, and the other 2 cases were left. The length of the vermilion of the upper lip in the Gillies fan flap was 9.5 mm(7.0-12.0 mm)in average.All cases healed well with inconspicuous scar. No infection, hematoma or other surgical complications.No local or distant recurrence of cancer was observed during the follow-up period. Numbness of the lower lip happened posto-peration, and gradually disappeared 6 months later.Evaluation was conducted according to the measurement result preoperatively and 6 months postoperatively. (1) Appearance: the reconstructed lips were naturally symmetrical. Both side of the mouth corner were in the same horizontal level. The upper lip was lengthened with average increase of 6.8 mm and average increase rate of 15.9%. The lower lip was lengthened with average increase of 15.4 mm and average increase rate of 45.3%. In the rest situation, the circumference of the lips decreased by 5.5 mm in average compared with that preoperatively, which was 94.9% of the lip preoperatively, basically rehabilitate to the shape preoperatively.(2) Mouth-opening function: 1 week postoperation, the opening shape of mouth in all the cases was skewed with an about 1.5 fingers mouth-opening. Six months later, the opening shape of mouth was basically symmetrical round with a 3 fingers mouth-opening; in maximum mouth opening situation, the circumference of the lips decreased by 46.5 mm in average compared with that preoperatively, which was 73.1% of the lip in maximum mouth opening situation preoperatively, basically meeting physiological needs. (3) Mouth-closing function: All patient shave complete mouth-closing function and speech function.No leakage when making closed lip sound and whistling. All patients were satisfied with the oral appearance and the function of opening and closing mouth.Conclusions:Unilateral Gillies fan flap with perioral muscle restoration is a reliable method to repair the moderate full-thickness defect of the lower lip after cancer resection. After dynamic reconstruction of the perioral muscle group, the insufficient tissue of lips can be extended to obtain sufficient mouth opening, natural corner of the mouth and symmetrical lip appearance.