Abstract
A 45-year-old man was referred to our hospital because of limitation of mandibular movement. He was given a diagnosis of hyperplasia of the mandibular coronoid process and masticatory muscle tendonaponeurosis hyperplasia. Bilateral coronoidectomy and aponeurectomy of the masseter muscles were performed via an oral approach. Posterior open bite was noted 3 days after the operation. Magnetic resonance imaging of both temporal mandibular joints showed displacement of the left condyle as well as joint effusion at the posterosuperior joint space. A splint and pumping manipulation were applied, and the patient was given a nonsteroidal anti-inflammatory drug. The left posterior open bite nearly completely improved with no negative impact on the patient’s quality of life 1 year 9 months after the operation.
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