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三、颌位关系的记录和转移(一)基本概念:颌位关系是指下颌对上颌的位置关系。此关系包括上下、前后、左右三个方向,即在张闭口运动中下颌可于不同的高度与上颌相对;在前伸,侧(牙合)运动中下颌又可于水平方向的不同位置与上颌相对,从而可构成若干个颌位关系。1.正中(牙合)位:正常人上下牙列在尖窝扣锁时的闭合状态叫正中(牙合),这时下颌对上颌的位置关系叫正中(牙合)位。在正中(牙合)位时上下牙列间有最广泛的(牙合)面接触,髁状突位于关节窝内适中的位置,两侧提颌肌群均等收缩。
Third, the relationship between the jaw position and transfer (a) the basic concept: jaw position refers to the jaw on the position of the maxilla. This relationship includes the upper and lower, anteroposterior, left and right three directions, that is, in the open and closed mouth movement of the lower jaw at different heights with the upper jaw relative; in the antegrade, lateral (occlusal) movement of the mandible and horizontal position in different positions and the maxillary Relative, which can form a number of jaw position. 1. Center (occlusal) bit: the normal upper and lower teeth in the spine when the lock is closed when the state is called the middle (occlusal), then the jaw on the position of the upper jaw called the median (occlusal) bit. In the median (occlusal) position between the upper and lower dentition has the most (occlusal) surface contact, condyles located in the joint fossa moderate position, on both sides of the lifting group were equal contraction.