The purpose of this study was to investigate the vibration pattern of the TMJ sounds and occlusal sounds in subjects with TMJ noises by using computerized sound
power-spectrum analyser (SonoPak, Bioresearch Inc., U.S.A.). For this study, 23 dental students who had complained of clicking sounds without any other symptoms of craniomandibular disorder and 11 patients with TMJ sounds and symptoms of craniomandibular disorder were selected.
Vibration patterns of two experimental groups were compared to 20 subjects in control group with no signs or symptoms of craniomandibular disorders (including the absence of clinically detectable TMJ sounds).
While the subjects of three groups performed metronome-guided maximum active mouth opening and closing, vibration signals of the TMJ sound and occlusal sound were detected by - transducers.
The total vibration energy, integral < 300Hz, integral > 300Hz, > 300/<300Hz ratio, peak amplitude, peak frequency, median frequency and velocity of the TMJ sounds and occlusal sounds were recorded by the SonoPAK for windows and BIO-EGN(Bioresearch Inc., U.S.A. )
The following results were obtained : This results between three groups were analysed by SPSS program.
1. In the analysis of TMJ sounds, there was statistically significant difference between clicking and TMJ dysfunction patients group in total integral, integral <"Hz, integral> "Hz, peak amplitude, peak frequency and med. frequency of mean value of vibration related -items (P<0.05).
2. In the analysis of TMJ sounds, there was statistically significant difference between normal and TMJ dysfunction patients group in total integral, integral <300Hz, integral> 300Hz, peak amplitude, peak frequency and med. frequency of mean value of vibration related -items (P<0.05).
3. In the analysis of sum of right & left occlusal sound, there was statistically significant
difference between normal group and TMJ dysfunction patients group in mean value of
total integral, integral <300 Hz, integral> 300Hz and peak amplitude(P<0.05).
4. In the analysis of difference of right & left occlusal sound, there was statistically
significant difference between normal group and TMJ dysfunction patients group in mean
value of total integral, integral <300 Hz. integral> 300 Hz and peak amplitude (P<0.05).
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