Usefulness of a newly developed small and lightweight mandibular movement recording device

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  • Shiga H
    Department of Partial and Complete Denture, The Nippon Dental University School of Life Dentistry at Tokyo
  • Maruyama T
    Department of Electrical and Electronic Systems Engineering, Ibaraki National College of Technology
  • Komino M
    Department of Partial and Complete Denture, The Nippon Dental University School of Life Dentistry at Tokyo
  • Nakajima K
    Department of Partial and Complete Denture, The Nippon Dental University School of Life Dentistry at Tokyo
  • Uematsu T
    Department of Partial and Complete Denture, The Nippon Dental University School of Life Dentistry at Tokyo
  • Watanabe A
    Department of Partial and Complete Denture, The Nippon Dental University School of Life Dentistry at Tokyo

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Other Title
  • 新たに開発した小型・軽量な下顎運動記録装置の有用性
  • アラタ ニ カイハツ シタ コガタ ・ ケイリョウ ナ カガク ウンドウ キロク ソウチ ノ ユウヨウセイ

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The purpose of this study was to investigate the usefulness of a newly developed small and lightweight mandibular movement recording device by two experiments. Experiment I: Triangles consisting of 3 LEDs (Light-emitting diode) were attached to the upper and lower frames of the articulator in parallel with the frontal plane. Subsequently, the upper frame was rotated on the sagittal plane and the position coordinates of each LED were recorded by a newly developed mandibular movement recording device (Device A). Then, the movement of the center of gravity of the triangle was observed. Experiment II: Ten healthy subjects in their 20s were asked to chew gum on their habitual chewing side and the mandibular movements were recorded simultaneously using Device A and TRIMET® (Tokyo Shizaisha, Device B). The path of each of 10 cycles beginning from the 5th cycle, their superposition, and the average path were displayed and observed. Subsequently, the amount of vertical movement and masticatory width were calculated from the average path and compared between the two devices. It was confirmed that the center of gravity of the triangle attached to the upper frame of the articulator describes a true arc around the intercondylar axis. In addition, it was also confirmed that the masticatory path recorded by Device A was similar to that recorded by Device B in all subjects. Furthermore, the amount of vertical movement and masticatory width calculated using Device A were similar to those calculated using Device B, with no significant differences in the results between the two devices. These findings confirmed that the newly developed three-dimensional mandibular movement recording device can record and analyze masticatory movements as efficiently as the TRIMET®, a highly accurate mandibular movement recording device, and suggested that it is also clinically applicable.

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