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Volumetric mandibular change after angle ostectomy and outer cortex grinding.

Jingyi Zhao1, Guodong Song1, Xianlei Zong1

  • 1Maxillofacial Surgery Department 2, Department No. 16. of Plastic Surgery Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, No. 33 Ba-Da-Chu Road, Shi Jing Shan District, Beijing 100144, PR China.

Journal of Cranio-Maxillo-Facial Surgery : Official Publication of the European Association for Cranio-Maxillo-Facial Surgery
|January 11, 2018
PubMed
Summary

Mandibular angle ostectomy effectively reshapes the jawline, with minimal bone regeneration observed post-surgery. Long-term follow-up shows stable bone volume, not returning to original levels after ostectomy and grinding.

Keywords:
Bone volumetric changeComputed tomography analysisProminent mandibular angle

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Area of Science:

  • Plastic Surgery
  • Oral and Maxillofacial Surgery
  • Aesthetic Surgery

Background:

  • Mandibular angle ostectomy is a common facial contouring procedure, particularly in Asian women.
  • Recurrence of mandibular angle hypertrophy is a concern for some patients post-surgery.

Purpose of the Study:

  • To evaluate volumetric changes in the mandible after angle ostectomy and outer cortex grinding.
  • To assess long-term bone regeneration and stability following the procedure.

Main Methods:

  • Twenty-four patients undergoing bilateral mandibular angle ostectomy and outer cortex grinding were analyzed.
  • Three-dimensional computed tomography (3D CT) was used to measure mandibular volume preoperatively, immediately postoperatively, and at long-term follow-up (≥12 months).

Main Results:

  • Preoperative mandibular volume was significantly greater than both immediate and long-term postoperative volumes (P=0.000).
  • No significant difference in mandibular volume was found between immediate and long-term postoperative measurements (P>0.05).
  • Mean bone regeneration at long-term follow-up was minimal, with slight variations between sides and with or without advancement genioplasty.

Conclusions:

  • Mandibular angle ostectomy successfully achieves a more oval facial contour.
  • While some bone regeneration occurs post-surgery, the mean bone volume does not return to preoperative levels.
  • The volumetric difference between preoperative and long-term postoperative bone is significant, indicating effective and stable contouring.