Comparison of total mandibular inferior border ostectomy versus T-shape genioplasty for chin narrowing combined with mandibular contouring
10.3760/cma.j.cn114453-20221017-00324
- VernacularTitle:全下颌下缘环形截骨术与T形颏成形术合并下颌角截骨术对比研究
- Author:
Heyou GAO
1
;
Yingyou HE
;
Yuchun XU
;
Libin SONG
;
Yiyuan WEI
;
Jihua LI
Author Information
1. 口腔疾病研究国家重点实验室 国家口腔疾病临床医学研究中心 四川大学华西口腔医院正颌及关节外科，成都 610041
- Keywords:
Genioplasty;
Mandibular osteotomy;
Mandibular angle;
Total mandibular inferior border ostectomy;
T-shape genioplasty;
Indication
- From:
Chinese Journal of Plastic Surgery
2023;39(7):695-703
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To compare the outcomes of the total mandibular inferior border ostectomy and the T-shape genioplasty for chin narrowing combined with mandibular contouring and to assess the indications of the total mandibular inferior border ostectomy.Methods:In this retrospective study, the clinical data were collected from the patients who received mandibular contouring and chin narrowing at the Department of Orthognathic and Temporomandibular Joint Surgery, West China Hospital of Stomatology, Sichuan University from January 2015 to January 2019. According to the surgical procedure, patients were divided into Total inferior border ostectomy (Group I) and T-shaped genioplasty combined with mandibular contouring (Group II). Computed tomography scans, combined with medical records and photographs, were collected preoperatively and in the final follow-up postoperatively. Lower facial height, chin width, chin symmetry, facial proportions as well as patients’ satisfaction and complications were investigated to assess the clinical outcomes. Statistical analyses were performed using IBM SPSS Statistics, version 20.0 (IBM Corp., Armonk, NY, USA). The measurement data were expressed as Mean±SD, and the counting data were expressed as case (%). T-test was performed to compare the age difference, average satisfaction score and the relative measurements between the two groups. Pearson’s chi squared test was used to compare the sex composition ratio and complication ratio between the two groups. P<0.05 was considered statistically significant. Results:102 patients were involved in this study, including 42 patients in group I, 7 males and 35 females; 60 patients in group Ⅱ, 11 males and 49 females. All patients improved lower facial contours. No severe complications were observed during the follow-up period(6~24 months) Regarding appearance satisfaction, 30 cases were very satisfied, 11 cases were satisfied, and 1 case was neutral in group I. 43 cases were very satisfied, 15 cases were satisfied, and 2 cases were neutral in group II. There was no significant difference ( P >0.05) between group I and group II in age, sex, inferior lip numbness, hematoma, severe swelling, infection, soft tissue ptosisand appearance satisfaction.There was a statistically significant difference ( P < 0.01) in preoperative lower facial height [(63.05±4.15) mm vs. (52.87±4.07) mm], Preoperative lower and midfacial height ratio [(107.89±3.11) % vs. (91.29±7.94) %], and preoperative chin width and lower facial height ratio [(90.31±3.19) % vs. (104.32±5.28) %], chin width change [(12.11±2.59) mm vs. (8.39±1.89) mm], postoperative chin deviation [(0.17±0. 09)mm vs. (0.36±0.20) mm] and Postoperative chin width and lower facial height ratio [(76.80±1.85) % vs. (80.95±3.75) %]. No statistical difference ( P>0.05) was found in preoperative chin deviation, midfacial height, postoperative lower facial heigh, postoperative lower and midfacial height ratio. Conclusion:In conclusion, compared to T-shape genioplasty combined with mandibular contouring, total mandibular inferior border ostectomy had a large amount of chin narrowing and better postoperative symmetry and is well suited for a longer, wider, and more asymmetrical chin. The surgical options should be considered and chosen quantitatively to achieve aesthetically satisfactory results.
