Comparative evaluation of total mandibular inferior border circumferential osteotomy and T-chinoplasty with mandibular angle osteotomy.

OBJECTIVE

The aim of this study was to compare clinical outcomes, patient satisfaction, and postoperative complications between total mandibular inferior border circumferential osteotomy and T-shaped chin contouring combined with mandibular angle osteotomy, and to evaluate their surgical indications.

METHODS

A retrospective analysis was conducted on 51 patients who underwent mandibular contouring between January 2018 and January 2022. According to the surgical technique, 21 patients were assigned to total mandibular inferior border circumferential osteotomy (Group I) and 30 to T-shaped chin contouring with mandibular angle osteotomy (Group II). Pre- and postoperative computed tomography images were analyzed to assess changes in chin width, height, offset, and facial proportions. Patient satisfaction and postoperative complications were also evaluated.

RESULTS

Postoperative complications included lower lip numbness, hematoma, infection, and soft tissue ptosis, with no significant difference between the two groups (all p>0.05). Satisfaction rates were similarly high in both groups (mean scores: 4.58±0.42 vs. 4.72±0.56, p>0.05). However, Group I achieved a significantly greater chin width reduction and narrowing rate than Group II (p<0.01), with a smaller postoperative chin offset (p<0.01). Group I patients also showed improved facial symmetry and proportion, with no significant difference in postoperative chin-to-midface height ratio (p>0.05).

CONCLUSION

Both techniques provide favorable aesthetic and functional results. Total mandibular inferior border circumferential osteotomy yields greater chin narrowing and better midline alignment, making it particularly suitable for patients with long, wide, or asymmetric lower faces seeking improved mandibular contour.