新たに開発した小型・軽量な下顎運動記録装置の有用性 [in Japanese] Usefulness of a newly developed small and lightweight mandibular movement recording device [in Japanese]
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本研究の目的は，２つの実験により，新たに開発した小型・軽量な下顎運動記録装置の有用性を検討することである．実験 I：咬合器の上弓と下弓に３つのLED（Light-emitting diode）で構成するトライアングルをそれぞれ前頭面と平行に装着する．次いで，上弓を矢状面内で顆頭間軸周りに回転させた時の各LEDの位置座標を新たに開発した下顎運動記録装置（装置Ａ）で記録後，トライアングルの重心点の運動を観察した．実験 II：20歳代の健常者10名に主咀嚼側でチューインガムを咀嚼させた時の下顎運動を装置Aと東京歯材社製TRIMET<sup>®</sup>（装置Ｂ）で同時記録した．分析は，咀嚼開始後の第５サイクルからの10サイクルについて，各サイクルとその重ね合わせ表示，ならびに平均経路の表示を行い，定性的に観察した．次いで，平均経路から開口量と咀嚼幅を算出し，両装置間で比較した．咬合器の上弓に装着したトライアングルの重心点は，顆頭間軸を中心に正確な円弧を描くことが確認できた．また，咀嚼運動経路は，いずれの被験者でも，装置Ａと装置Ｂとが近似していることが確認できた．さらに，開口量と咀嚼幅は，装置Ａと装置Ｂとが近似し，両装置間に有意差が認められなかった．これらの結果から，新しく開発した３次元下顎運動記録装置は，高精度の下顎運動記録装置であるTRIMET<sup>®</sup>と同程度に咀嚼運動を記録・分析できることが確認でき，臨床応用できることが示唆された．
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<sup>®</sup> (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<sup>®</sup>, a highly accurate mandibular movement recording device, and suggested that it is also clinically applicable.
- The Journal of Japanese Society of Stomatognathic Function
The Journal of Japanese Society of Stomatognathic Function 21(1), 21-27, 2014
Japanese Society of Stomatognathic Function