Abstract
Fifty-three closed lock cases of internal derangement of the temporomandibular joint (TMJ) were studied on the correlation between clinical status and duration of closed locking.The anterior disk displacement was diagnostically verified by MRI. Clinical symptons and status were obtained through both physical examination and questionnaire. The questionnaire consisted of visual analogue scale of pain, pain score, jaw dysfunction score and life activity limited score, and they were quantitatively evaluated.The age and locking duration averages in 53 patients were 29.5 years old and 8.3 weeks, respectively. Clinical subjective symptons such as pain and jaw dysfunction were little related with closed lock duration. Only the interincisal opening distance was correlated with locking duration, especially strongly in positive in the younger group below 20 years of age. On the other hand there was not any statistically significant relationship between the interincisal opening distance and clinical symptons.These results indicated two independent therapeutic goals; relief from pain and increasing of ROM (range of motion) of the mandible should be sought by means of non-surgical and/or surgical treatments for closed lock TMJ patients.
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