アブストラクト（55巻1号：神奈川歯学）

神奈川歯学

Japanese

Title　： 下顎運動アニメーションを用いた咀嚼時の顎関節空隙の計測 - 顎変形症者における検討 -
Subtitle　： 原著
Authors　： 金田用将, 尾崎博弥, 不島健持
Authors（kana）　：
Organization　： 神奈川歯科大学大学院歯学研究科高度先進口腔医学講座歯科矯正学分野
Journal　： 神奈川歯学
Volume　： 55
Number　： 1
Page　： 43-56
Year/Month　： 2020 / 6
Article　： 原著
Publisher　： 神奈川歯科大学学会
Abstract　： 「緒言」顎関節は, 回転と滑走を伴う生体の中で最も複雑な運動を担う滑膜性の関節であり, ポステリアーガイダンスとして上下の歯の咬合接触によるアンテリアーガイダンスとともに下顎運動を制御する. 顎関節の軟骨層は, コラーゲン線維の三次元メッシュワークとアグリカンと呼ばれる軟骨型プロテオグリカンにより構成されており, 機能圧が加わっていない安静時には構造水を保持している. 下顎運動時に軟骨層に機能圧が加わると関節軟骨特有の粘弾性を発揮し, 間歇的な強い負荷を分散し軟骨下骨層への応力を緩衝する. このような関節機構の恒常性の維持には, 軟骨層の細胞外基質を合成し代謝する細胞の健全性が不可欠である. 軟骨層が無血管性であることより, 軟骨層の細胞への栄養は関節腔の滑液と軟骨層の構造水の拡散移動により供給され, そのため咀嚼など下顎機能時に関節軟骨層に間歇的に加わる生理的負荷が決定的に重要である.
Practice　： 歯科学
Keywords　： 顎関節空隙, 咀嚼, 顎変形症, 下顎アニメーション

English

Title　： Measurement of the TMJ intraarticular space variation during mastication using the mandibular animation - Examination in patients with jaw deformity -
Subtitle　：
Authors　： Yosho KANEDA, Hiroya OZAKI, Kenji FUSHIMA
Authors（kana）　：
Organization　： Division of Orthodontics, Department of Highly Advanced Stomatology, Graduate School of Dentistry, Kanagawa Dental University
Journal　： Kanagawa Shigaku
Volume　： 55
Number　： 1
Page　： 43-56
Year/Month　： 2020 / 6
Article　： Original article
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] Aim: To understand the occlusion, the analysis of functional loading on the temporomandubular joint (TMJ) is important subject. It is considered that measurement of intraarticular space is currently the only method allowing in vivo, a non-invasive, quantitative insight into the TMJ load. This study aimed; 1) to construct a mandibular animation, 2) to evaluate the accuracy and precision of the mandibular animation, 3) to examine the TMJ intraarticular space variation relating to the mandibular movement during mastication. Materials and Methods: In twelve patients having jaw deformity, three-dimensional morphological data of the TMJ obtained by means of the computed tomography and motion data recorded by the mandibular tracking system were utilized in this study. The mandibular animation was constructed by integrating the anatomical data of the mandible with the kinematic data. The distance from representative point on the condyle to its closest point on the glenoid fossa was measured and defined as the intraarticular TMJ space. TMJ space variation corresponding to opening degree of the mandible was analyzed during free mastication. Results and Discussion: Accuracy and precision of the mandibular animation system considered to be suitable for the analysis of intraarticular space. At the intercuspal position, the TMJ space of the medial, middle and lateral on the condyle was an average of 1.5 mm, 1.3 mm and 1.1 mm respectively. Opening degree of the mandible at the time of the TMJ space extension and reduction was an average of 3.6 degree and 2.4 degree respectively. There was significant difference between them (P < 0.01). A reduction of the TMJ space can be caused by compressive loading on the condyle. Therefore, it is suggested that functional loading on the condyle is exerted while the closing phase of the mandible during mastication.
Practice　： Dentistry
Keywords　：