EFFECTS OF TMJ ANKYLOSIS ON ELECTROMYOGRAPHIC ACTIVITY OF MASSETER AND TEMPORAL MUSCLES AND FACIAL AND MANDIBULAR GROWTH: A CASE REPORT

Purpose: the purpose of this study is to report electromyographic, clinical and radiological featur es of an adult female patient having bilateral complete tmj ankylosis that occurred her childhood. material and methods: a 42-year old female patient was diagnosed with bilateral complete tmj ankylosis. according to anamnestic data, tmj was injured by a trauma when she was 5 years old. results: clinical and radiological examinations showed that the patient had hypoplasic mandible and convex profile, facial asymmetry, 0 mm of mouth opening, poor oral hygiene, complete absence of all anterior and right posterior teeth, and a huge bone block in both tmj area and ankylosis of both tmjs. in addition to these finding, electromyographic activities of masticatory muscles affected from tmj ankylosis. conclusion: the findings of the present case report showed that bilateral tmj ankylosis has potential negative effects on facial and mandibular growth and motor outputs (emg values) of masticatory muscles.