下顎運動パラメータの安定性について  3年経過後の評価から

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タイトル別名
  • Reliability of the Mandibular Movement Parameters-Initial and 3-year Subsequent Recording Comparison-
  • Initial and 3-year Subsequent Recording Comparison
  • 3年経過後の評価から

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Purpose: To ascertain the reproducibility and reliability of mandibular movement as one of the parameters reflecting mandibular functions, mandibular movements were recorded at different time points over three years for the same subjects.<BR>Methods: For twenty-seven healthy volunteers (20 males and 7 females, average age 20.4±2.4 years old) without past or current history of temporomandibular disorder (TMD), border mandibular movement and habitual open-close jaw movements were recorded with a six-degree-of-freedom jaw tracking device. Three years later, identical movements that the subjects had initially been instructed to perform were recorded again for the same subjects, and the translational distance at the incisal and condylar points were compared.<BR>Results: Neither the distance parameters of protrusive and lateral excursion nor open-close movement showed any statistically significant difference between the initial and subsequent records (paired t-test). Although five subjects eventually revealed TMD symptoms during the three-year-period, there was no distinctive parameter that predicted the symptoms from the initial data.<BR>Conclusions: Since mandibular movement is thought to be a reliable parameter in non-TMD subjects, mandibular movement recording has been confirmed to be of use to evaluate the functional changes. However, it is difficult to predict possible changes in mandibular function from mandibular movement analysis alone.

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