The efficacy of month opening exercise for the patients with persistent closed lock in temporomandibular joint

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We undertook a clinical study to investigate the efficacy of mouth opening exercise for 20 patients with persistent closed lock in temporomandibular joint (mean age: 38.9 years, range: 16 to 59 years). The results were summarized as follows:1) The mean of maximum mouth opening increased from 26.5mm to 40.2mm after treatment, and continued to improve during the follow-up period (mean 40.8mm) 2) Although all the patients had pain in TMJ or masticatory muscles before exercise, it disappeared or was alleviated after treatment in all patients, except for one who continued to have severe pain. 3) Crepitus that was noted in 7 joints before exercise disappeared after treatment in two joints, and other seven joints newly developed crepitus after treatment which did not disappear during the follow-up period. 4) Eight of 13 joints with normal configuration of the condylar head developed bony changes during the follow-up period. Most of the remaining joints with radiographic bony changes on first examination showed evolution of bony changes during the follow-up period. 5) This treatment was effective in 85% of our patients judging from the criteria for TIM meniscus surgery by American Association of Oral and Maxillofacial Surgeons (1984).These results suggest that this treatment is effective and should be the first treatment of choice for patients with persistent closed lock.
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