Mouth opening limitation caused by coronoid hyperplasia: a report of four cases
김성민, 이진혁, 김학진, 허종기,
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김성민 ( Kim Sung-Min ) - Yonsei University College of Dentistry Gangnam Severance Hospital Department of Oral and Maxillofacial Surgery
이진혁 ( Lee Jin-Hyeok ) - Yonsei University College of Dentistry Gangnam Severance Hospital Department of Oral and Maxillofacial Surgery
김학진 ( Kim Hak-Jin ) - Yonsei University College of Dentistry Yongin Severance Hospital Department of Oral and Maxillofacial Surgery
허종기 ( Huh Jong-Ki ) - Yonsei University College of Dentistry Gangnam Severance Hospital Department of Oral and Maxillofacial Surgery
KMID : 0355620140400060301
Abstract
Coronoid process hyperplasia is a rare condition that causes mouth opening limitation, otherwise known as trismus. The elongated coronoid processes impinge on the medial surfaces of the zygomatic arches when opening the mouth, which limits movement of the mandible and leads to trismus. Pa-tients with trismus due to coronoid process hyperplasia do not have any definitesymptoms such as temporomandibular joint pain or sounds upon clini-cal examination, and no significantabnormal signs are observed on panoramic radiographs or magnetic resonance images of the temporomandibular joint. Thus, the diagnosis of trismus is usually very difficult.However, computed tomography can help with the diagnosis, and the condition can be treated by surgery and postoperative physical therapy. This paper describes four cases of patients who visited our clinic for trismus and were subse-quently diagnosed with coronoid process hyperplasia. Three were successfully treated with a coronoidectomy and postoperative physical therapy.
키워드
Trismus; Temporomandibular joint disorders; Hyperplasia; Mandible; Diagnosis
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