J Korean Assoc Oral Maxillofac Surg 2019; 45(4): 174~179
Masticatory muscle tendon-aponeurosis hyperplasia accompanied by limited mouth opening
Tetsuya Yoda
Department of Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
Tetsuya Yoda
Department of Maxillofacial Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
TEL: +81-3-5803-5498 FAX: +81-3-5803-0198
E-mail: yoda.mfs@tmd.ac.jp
ORCID: https://orcid.org/0000-0003-1896-8696
Received August 9, 2019; Accepted August 12, 2019.; Published online August 31, 2019.
© The 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.
 Abstract
Patients with masticatory muscle tendon-aponeurosis hyperplasia (MMTAH) experience limited mouth opening due to restricted muscle extension. Hyperplastic aponeurosis and tendons lead to the restriction of muscle extension. The criteria for the diagnosis of MMTAH are limited mouth opening that progresses very slowly from adolescence, intraoral palpation reveals a hard cord-like structure along the overhang of the anterior border of the masseter muscle on maximum mouth opening, and a square mandible. Conservative treatment, including pharmacotherapy, occlusal splint and physical therapy are ineffective. The standard therapy is surgical treatment, such as anterior partial aponeurectomy of the masseter muscle and coronoidectomy. The long-term results are very satisfying.
Keywords: Masticatory muscle, Tendon, Aponeurosis, Limited mouth opening


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31 August 2019
Vol. 45
No. 4 pp. 173~230

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