This study was performed to investigate the factors related to vibration of temporomandibular joint during mandibular opening movement. For this study, 144 patients with temporomandibular disorders were randomly selected. Angle´s classification, lateral guidance pattern, range of maximal mouth opening, preferred chewing side, and affected side were investigated clinically. Mandibular torque rotational movement during opening was recorded with BioEGN® and vibration of temporomandibular joint during. opening was recorded with Sonopak®.
After clinical diagnosis was made, visual analogue scale(VAS) was used for evaluation of clinical progress of the subject´s chief complaints. The author calculated VAS treatment index(VAS Ti) from the record of VAS. The more VAS Ti was, the less remission of subjective symptom was. The data were analyzed with SAS/Stat program and the results of this study were as follows: 1. There were no significant difference in all the variables of joint vibration by age and sex 2. Integral and peak amplitude in patients of Angle´s class I were higher than those of class II or III
patients. Integral in patients of group function was higher than that in patients of canine guidance or
other types of lateral excursion.
3. As to Angle´s classification or lateral guidance type, there were almost not significant difference between subgroup of same class or type and subgroup of different class or type on both sides. And there were also almost not difference between one side and the other side related to preferred chewing side or affected side.
4. Patients with disk displacement with reduction showed higher value of integral and peak amplitude than any other patients.
5. Joint vibration variables significantly correlated with VAS Ti of pain, with clinical range of mouth opening, and with ingredients of mandibular torque rotational movement.
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