-Abstract-
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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