AbstractThis study was performed to investigate the changes of vibration in the temporomandibu-
lar joint after conservative treatment of temporomandibular disorders(TMDs). There have
been several methods for evaluating joint sounds, but methods of sound analysis are not
as reliable as joint vibration analysis because so many surrounding sounds could be mixed
with joint sounds. Joint conditions which can cause mandibular dyskinesia may also bring
about joint vibration, which turns to sounds. The relationship of temporomandibular joint
sounds and vibration to temporomandibular disorders has been discussed in many articles,
and as a result, joint vibration analysis could be used as a effective measure for joint
evaluation.Twenty-three patients with TMDs were participated in this study. All of them were
unilateral joint sounds patients with ipsilateral chewing side preference. Magnitude of joint
sound was recorded in visual analogue scale(VAS) chart whenever he or she came to
clinic and changes of scale between the first record and 3 months after record were calcula-
ted and converted to VAS treatment index. For measuring joint vibration, the author used
Sonopak？program of Biopak？system (Bioresearch Inc., WI, USA). Observed items were
total energy of vibration (Integral), energy of high frequency zone and low frequency zone
based on SOOHz, peak amplitude, peak frequency, and median frequency. Data were collected
and analyzed with SAS statistical program and the results obtained were as follows :1. Vibration of opening sound in affected side decreased significantly in total energyOnteg-
ral) and energy of high frequency zone, and vibration in contralateral side also decreased
significantly in more items after treatment.
2. Vibration of closing sound both in affected side and in contralateral side did not decreased
significantly in all items observed with treatment. As a result, vibration eneygy of opening
sound were significantly higher than that of closing sound in several items before treat-
ment, but there were no significant difference between the two sounds after treatment.
3. Positive correlations among total energy, peak amplitude, and peak frequency were obser-
ved in case of opening sound, and positive correlations among peak frequency, median
frequency, and sound VAS treatment index were observed in case of closing sound.
This study was performed to investigate the changes of vibration in the temporomandibular joint after conservative treatment of temporomandibular disorders(TMDs). There have been several methods for evaluating joint sounds, but methods of sound analysis are not as reliable as joint vibration analysis because so many surrounding sounds could be mixed with joint sounds. Joint conditions which can cause mandibular dyskinesia may also bring about joint vibration, which turns to sounds. The relationship of temporomandibular joint sounds and vibration to temporomandibular disorders has been discussed in many articles, and as a result, joint vibration analysis could be used as a effective measure for joint evaluation.
Twenty-three patients with TMDs were participated in this study. All of them were unilateral joint sounds patients with ipsilateral chewing side preference. Magnitude of joint sound was recorded in visual analogue scale(VAS) chart whenever he or she came to clinic and changes of scale between the first record and 3 months after record were calculated and converted to VAS treatment index. For measuring joint vibration, the author used Sonopak^® program of Biopak^® system (Bioresearch Inc., WI, USA). Observed items were total energy of vibration (Integral), energy of high frequency zone and low frequency zone based on 300Hz, peak amplitude, peak frequency, and median frequency. Data were collected and analyzed with SAS statistical program and the results obtained were as follows :
1. Vibration of opening sound in affected side decreased significantly in total energy(integral) and energy of high frequency zone, and vibration in contralateral side also decreased significantly in more items after treatment.
2. Vibration of closing sound both in affected side and in contralateral side did not decreased significantly in all items observed with treatment. As a result, vibration eneygy of opening sound were significantly higher than that of closing sound in several items before treatment, but there were no significant difference between the two sounds after treatment.
3. Positive correlations among total energy, peak amplitude, and peak frequency were observed in case of opening sound, and positive correlations among peak frequency, median frequency, and sound VAS treatment index were observed in case of closing sound.
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