Measurement and Analysis of Jaw Movements

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  • Fujimura Tetsuya
    Former Tokushima Bunri University Graduate School of Engineering, Department of Nanostructures Engineering

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Other Title
  • アゴの動きを知る（顎運動の測定と解析）
  • 教育講演 アゴの動きを知る(顎運動の測定と解析)
  • キョウイク コウエン アゴ ノ ウゴキ オ シル(ガク ウンドウ ノ ソクテイ ト カイセキ)

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 Jaw activity directly relates to occlusion and is strongly associated with jaw movement. Movement is also an important part of occlusion examination and diagnosis. An instrument to measure jaw movement in six degrees of freedom is available, and several papers have already reported results using this device. However, the results are difficult to analyze due to the lack of clarity concerning instrument use and measurement values. It is necessary to fully understand the basic measuring theory, the technology, and the analysis method when using the device.<br> This paper introduces a theory of measurement that calculates the spatial position of the analysis point based on the relationship of a two-dimensional orthogonal coordinate, assuming that the upper and lower jaw are a rigid-body. The paper also illustrates the differences between the basic activities used for the evaluation of jaw movement and the physiological activities related to jaw function from the aspect of measurement technology. The paper also explains the differences and uncertainties of typical movements of the mandible and complementary maxillary movements.<br> Our future work will continue to study the development of instruments to measure jaw movement due to their application in high-precision 3DCG articulator and CAD/CAM dentures.

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