McMillan A S, McMillan D R, Darvell B W
Department of Prosthetic Dentistry, Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong.
Acta Odontol Scand. 1989 Oct;47(5):323-8. doi: 10.3109/00016358909007719.
Anatomists consider the articulation of movable joints to be complex, involving movable instantaneous centers of rotation (ICR). However, prosthodontists often treat the temporomandibular joint (TMJ) as a model of a simple hinge. The aim of this study was to examine the case for a movable ICR during habitual opening and closing jaw movements. Young, dentate subjects were examined with a kinesiograph. Jaw movements were performed and recorded. The center of rotation of each movement pattern was identified, and its location related to the position of the TMJ. The results showed that opening and closing jaw movements were predominantly non-coincident, with a movable ICR located at a variable distance and direction from the TMJ. There was no evidence to suggest that the TMJ functioned as a simple hinge during jaw movements.
解剖学家认为可动关节的关节连接很复杂，涉及可动的瞬时旋转中心（ICR）。然而，口腔修复学家常常将颞下颌关节（TMJ）视为简单铰链模型。本研究的目的是探究在习惯性的开闭口颌运动过程中是否存在可动的瞬时旋转中心。对年轻的有牙受试者使用运动描记仪进行检查。进行并记录颌运动。确定每种运动模式的旋转中心，并将其位置与颞下颌关节的位置相关联。结果表明，开闭口颌运动主要不一致，可动的瞬时旋转中心位于距颞下颌关节可变的距离和方向处。没有证据表明在颌运动过程中颞下颌关节起到简单铰链的作用。
