Drawer-genioplasty for the reduction of long-chin deformity
Objective To investigate the efficacy of drawer-genioplasty in correcting the long-chin deformity and preventing postoperative sagging of submental soft tissues.Methods Forty-two patients with long-chin deformity admitted to the Department of Craniomaxillofacial Surgery,Plastic Surgery Hospital from October 2020 to December 2023 were selected for this study.The modified drawer-genioplasty was performed through an intraoral incision approach,using subapical and mandibular contouring osteotomy.The os-teotomy lines were designed and performed during surgery to minimize damage to the bone attachments of the anterior belly of the digastric muscle,mylohyoid muscle,and geniohyoid muscle to protect the floor-of-mouth muscles adequately.Digital technology enabled the as-sessment of surgical outcomes through the analysis of three-dimensional reconstruction of bone and facial scanning.Follow-up visits were conducted 6-12 months post-surgery.Results All patients achieved uncomplicated primary healing at gingiva-labial sulcus incisions,without any occurrences of hematoma,infection,or bone necrosis.The digital analysis revealed a postoperative ratio change of 1:0.86 be-tween the chin bones and soft tissues.Measurements demonstrated an increase in R1(the ratio of the middle and lower face)from preoper-ative 0.82±0.09 to postoperative values 0.92±0.11,as well as an increase in R2(the ratio of the upper and lower lips)from preoperative 0.52±0.06 to postoperative values 0.63±0.05.However,there was an increase in the mentocervical angle from preoperative 104.90°±8.02°to postoperative 111.50°±7.03°,this value was still within the normal range.The results above demonstrated statistically significant differences(P<0.05).Two patients experienced transient lower lip numbness postoperatively,which resolved at four months and ten months respectively.All patients expressed satisfaction with their postoperative facial contour morphology.Conclusion The modified drawer-genioplasty demonstrates both safety and efficacy in correcting patients with long chin deformity,while effectively preventing postoperative sagging of the submental soft tissues,thereby exhibiting significant clinical applicability.
Long chin deformityMandibular osteotomyGenioplastyFloor-of-mouth musclesBone healing
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