[Relationship of TMJ sounds and mandibular movements]

TMJ sounds are very important for diagnosing the state of TMJ and for evaluation of the effect of treatment. We made a report on a recording system of TMJ sounds and mandibular movement which objectively can evaluate the relationship between TMJ sounds and mandibular movement. This time we recorded and analyzed the TMJ sounds and mandibular movement under following condition. 1. Opening and closing the mandibular on some regulated velocity. 2. Opening and closing the mandibular after clenching. Conclusion 1. In case of changing habitual opening velocity, there were significantly different position of clicking in the most of TMJ disorders patients. Especially with the increasing of the velocity, the position of closing clicking tended to come near the closed condyle position. 2. The amplitude of clicking sound increased very much at the time of opening stage after clenching on the non clicking side.