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The functional significance of molar occlusion pattern and vertical dimension investigated by the movement pattern tempomandibular disk and condyle

通过颞下颌盘和髁突运动模式研究磨牙咬合模式和垂直尺寸的功能意义

基本信息

批准号：
15592181
负责人：
NEGORO Takefumi
金额：
$ 2.5万
依托单位：
Aichi-Gakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2006
项目状态：
已结题

项目摘要

Temporomandibular joint disorder [Disturbance of jaw function] is often accompanied by pain of the temporomandibular joint and abnormal movements of the mandibular condyle. To record such a morbid condition and to elucidate the mechanisms of its development, we assume it necessary to investigate into movements of the mandibular condyle and activities of the lateral pterygoid muscle that directly exerts its influence to movements of the condyle. We recorded movements of the incisal point and the mandibular condyle during masticatory-like movements induced by electrical stimulation of the cortical masticatory area of urethane-anesthetized rabbits. There is a time lag between the onset of electromyogram (EMG) and the emergence of mechanical tension, and this time lag cannot be neglected in such a rapid movement as masticatory movements of rabbits. Accordingly we analyzed the relation between the EMG and the jaw movements taking this time lag quantitatively into consideration.The trajector … More y of movements of the incisal point on the frontal plane showed a grinding-type movement, crossing the midline during the occlusal phase. During this movement, the movement of the mandibular condyle [incisal point] showed approximately the same trajectory on the working and balancing sides during the jaw-opening phase, while the trajectory of movements of the mandibular condyle in the jaw-closing and occlusal phases passed above the trajectory in the jaw opening phase on the working side, whereas it passed below the trajectory in the jaw-opening phase on the balancing side.The lateral pterygoid muscle showed a biphasic activity coinciding with the middle occlusal phase and the jaw-opening phase. In addition to this finding, we took the delay time from the onset of EMG activity to the emergence of mechanical tension into consideration, and we assumed that these muscle activities evoked the lateral jaw movement across the midline at the late occlusal phase as well as the jaw-opening movement from the midline region in the jaw-opening phase. On the other hand, the lateral pterygoid muscle on the balancing side showed a continuous activity from the late occlusal phase to the jaw-opening phase. This activity was supposed to evoke the return of the jaw to the midline at the early jaw-opening phase and the following jaw-opening movement. Thus, by the study taking the delay time into consideration, we were able to elucidate the roles of the masseter and lateral pterygoid muscles in jaw movements. Less

颞下颌关节紊乱[颌功能紊乱]常伴有颞下颌关节疼痛和下颌髁运动异常。为了记录这种病态的情况并阐明其发展机制，我们认为有必要研究下颌髁的运动和翼状外侧肌的活动，这些活动直接影响髁的运动。实验记录了氨基脲麻醉兔皮质咀嚼区电刺激引起的咀嚼样运动中切点和下颌髁的运动。肌电图（electromyogram， EMG）的出现与机械张力的出现之间存在一定的时间差，这种时间差在兔子咀嚼运动这样的快速运动中是不可忽视的。因此，我们定量地分析了肌电图与颌骨运动之间的关系，并考虑了这一时间差。锋面切点的运动轨迹在咬合期呈磨磨型运动，越过中线。在此运动过程中，下颌髁[切点]在开颚期的运动轨迹在工作侧和平衡侧大致相同，而下颌髁在闭颌期和咬合期的运动轨迹在工作侧高于开颚期的运动轨迹，而在平衡侧低于开颚期的运动轨迹。外侧翼状肌呈双相活动，与中咬合期和开颚期相吻合。除此之外，我们还考虑了肌电活动开始到机械张力出现的延迟时间，我们假设这些肌肉活动在咬合后期引起了跨中线的侧颌运动，以及在开颌期引起了中线区域的开颌运动。另一方面，平衡侧外侧翼状肌从咬合晚期到开颚期呈连续活动。这一活动被认为是为了唤起下巴在早期张开下巴阶段回到中线和随后的张开下巴运动。因此，通过考虑延迟时间的研究，我们能够阐明咬肌和翼侧肌在颌骨运动中的作用。少

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

咬合高径(様式)の変化が顎関節頭・円板の運動様式に与える影響

咬合高度（风格）变化对颞下颌关节头及椎间盘运动风格的影响

DOI：
发表时间：
2005
期刊：
歯界展望 2005特別号
影响因子：
0
作者：
根来武史
通讯作者：
根来武史

Movements of the condylar disk during fictive mastication in Rabbits

兔子虚构咀嚼过程中髁盘的运动

DOI：
发表时间：
2005
期刊：
Dentistry in Japan 41・1
影响因子：
0
作者：
Uematsu S et al.;Mizoguchi T et al.;田中丈也他;Kobayashi Y et al.;Tanaka T et al.;Kobayashi Y et al.;Uematsu S et al.;Takumi Morita
通讯作者：
Takumi Morita

The Effects of Movements of the condylar disk during fictive mastication in Rabbits

家兔虚拟咀嚼过程中髁突盘运动的影响