正常者の顎関節運動音に関する研究

前後的下顎位による負荷の影響

抄録

This study was conducted to investigate how the sounds of TMJ movement were changed by TMJ loading. Sounds of TMJ movement were recorded by contact microphones in 7 normal subjects, and amplified with filtered bioelectrical amplifiers. The filter was a high-pass with a cut-off frequency at 40Hz and a slope of 6 dB/octave as an equalizer. Joint sounds and mandibular movements were simultaneously recorded on a data recorder. Sound recordings from two measurement sites in four different mandibular positions and three different speeds of jaw opening were set.
The results were as follows:
. Recordings made 20mm anterior to the average condylar position clearly caught the changing conditions of the TMJ.
2. Observing changes in the frequency was informative. It was desirable for the jaw opening speed to be slow or moderate.
3. Loading the front of the TMJ increased the high frequency of the sounds generated by TMJ movement. One method for diagnosing mild cases of TMD was considered to be to observe the range of frequencies between those of normal and abnormal subjects.