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Comparison of Bilateral Mandibular Angle Ostectomy Between East Asian Males and Females: A Study Based on Three-Dimensional Computed Tomography Reconstruction

  • Dong Zhang
  • Hong Du
  • Guodong Song
  • Xianlei Zong
  • Xiaoshuang Guo
  • Chenzhi Lai
  • Jingyi Zhao
  • Le Du
  • Xiaolei JinEmail author
Original Article Maxillofacial/Craniofacial

Abstract

Background

Mandibular angle ostectomy is a common plastic surgery for facial contouring in East Asians. However, rarely we could find reports on differences between East Asian males and females undergoing this surgery.

Objective

To describe the differences between East Asian males and females before and after mandibular angle ostectomy.

Methods

A total of 22 Asian males and 52 Asian females who underwent mandibular angle ostectomy from April 2015 to November 2018 were enrolled. Three-dimensional computed tomography was used to evaluate the preoperative and postoperative data of the mandible. Thirteen clinical data were measured on reconstructed mandibular models. The differences in data between males and females were analyzed to identify the causes of the differences before and after surgery. The follow-up was 6–12 months, and patient satisfaction was also evaluated.

Results

The ostectomy volume was positively correlated with the distance from the intersection of the occlusal plane and the anterior margin of the mandibular ramus to gonion (MR-Go; female, p < 0.01; male, p = 0.02). There was a positive correlation between the ostectomy volume and the postoperative drainage fluid (The drainage fluid is mainly blood) volume after surgery in females (p < 0.05), while there is no significant correlation between these two data in males (p = 0.19). Patients with a long distance from the second molar to the lower edge of the mandibular body (SM-MB) tended to have a higher risk of postoperative bleeding (female, r = 0.56, p < 0.01; male, r = 0.73, p = 0.01).

Conclusion

Because of the difference in the anatomical size of the mandible and different aesthetic requirements for facial contouring between males and females, surgeons encounter different intraoperative conditions resulting in difficulties during surgery. Understanding differences in mandibular angles predicts differences in ostectomy volume and postoperative bleeding risk, thus aiding surgeons and leading to better operative outcomes.

Level of Evidence III

This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266.

Keywords

Mandibular angle ostectomy Three-dimensional computed tomography reconstruction Ostectomy volume Drainage fluid volumes 

Notes

Funding

No funding was received for this article.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflicts of interest to disclose.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the clinical research committee of plastic surgery hospital (12100000400266049B) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed Consent

Informed consent was obtained from all patients and can be seen by the editors.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature and International Society of Aesthetic Plastic Surgery 2020

Authors and Affiliations

  1. 1.16th Department, Plastic Surgery Hospital, Chinese Academy of Medical SciencesPeking Union Medical CollegeBeijingChina

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