J Korean Assoc Oral Maxillofac Surg 2017; 43(4): 239~246
New method for an evaluation of the esthetical improvements resulting from a mandibular angle reduction
Joo-Hwan Kim, Se-Jin Han, Moon-Young Kim
Department of Oral and Maxillofacial Surgery, College of Dentistry, Dankook University, Cheonan, Korea
Se-Jin Han
Department of Oral and Maxillofacial Surgery, College of Dentistry, Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan 31116, Korea
TEL: +82-41-550-1996 FAX: +82-41-551-8988 E-mail: hanimplant@dankook.ac.kr ORCID: http://orcid.org/0000-0003-4949-4462
Received March 9, 2017; Revised May 12, 2017; Accepted May 26, 2017.; Published online August 31, 2017.
© Korean Association of Oral and Maxillofacial Surgeons. All rights reserved.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Objectives: This paper proposes Han’s ratio as an objective and quantitative comparative result obtained from pre and postoperative data in patients with a mandibular angle reduction.
Materials and Methods: Thirty patients, 12 men and 18 women, who visited the Department of Oral and Maxillofacial Surgery with the chief complaints of skeletal mandibular prognathism and prominent mandibular angle were selected. The subjects were classified into 3 groups according to the types of surgical procedures involved. Group A consisted of patients who underwent mandibular angle resection and mandibular setback. Group B was comprised of patients with mandibular angle resection, mandibular setback and genioplasty. Group C consisted of patients with mandibular angle resection, mandibular setback, Le Fort I osteotomy, and genioplasty. The landmarks placed in pre and postoperative frontal photographs were used to obtain the Han’s ratio in each group. The Han’s ratios were compared pre- and postoperation and according to the surgical techniques applied.
Results: Of the 3 groups who had undergone a mandibular angle resection, all showed a statistically significant increase in Han’s ratio. On the other hand, there was no statistically significant difference based on the surgical techniques used.
Conclusion: The ratio of the lateral lower face proposed in this study is a potential indicator of postoperative esthetic enhancement in mandibular angle reduction surgery.
Keywords: Mandibular angle, Orthognathic surgery, Surgery, Plastics, Facial analysis

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