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The reproducibility of temporomandibular joint vibrations over time in the human
Author(s) -
Zhang J.,
Whittle T.,
Wang L.,
Murray G. M.
Publication year - 2014
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/joor.12141
Subject(s) - intraclass correlation , reproducibility , analysis of variance , mathematics , temporomandibular joint , medicine , repeated measures design , amplitude , vibration , confidence interval , orthodontics , nuclear medicine , statistics , physics , acoustics , optics
Summary The aim of the study was to assess the reproducibility of vibrations recorded from the temporomandibular joint ( TMJ ) in a group of healthy subjects. The vibrations from TMJ were recorded bilaterally from 34 healthy subjects by electrovibratography in three sessions at intervals of 3 min and again after 1 week. The total integral of the vibration energy, the ratio of the integral between frequencies above 300 Hz and below 300 Hz (ratio of >300 Hz/<300 Hz), peak frequency, median frequency, peak amplitude and distance to centric occlusion position were calculated. Data were analysed with intraclass correlation coefficients ( ICC ) and two‐way anova for repeated measures. All variables showed good to excellent reliability across different sessions ( ICC day1 : 0·935–0·987; ICC day2 : 0·910–0·992) and across different days ( ICC : 0·738–0·907). According to anova for repeated measures, all variables showed good reproducibility ( P > 0·05) between sessions at the same day. There was no significant difference between the 2 days for the frequency‐related variables including peak frequency ( P = 0·083), median frequency ( P = 0·188) and ratio of >300 Hz/<300 Hz ( P = 0·26). There was a statistical difference between the 2 days for the intensity‐related vibration variables including total integral ( P = 0·045) and peak amplitude ( P = 0·026). The wave patterns of the power‐frequency spectra were qualitatively similar over both the sessions and days. Joint vibration analysis could provide a fast, non‐invasive, and repeatable method to record the status of TMJ . Further studies are needed to identify the characteristic waveforms for different subgroups of temporomandibular disorders and to evaluate the possibility of diagnostic value.