Feingold G M, Grant A A, Johnson W
J Oral Rehabil. 1986 Nov;13(6):541-8. doi: 10.1111/j.1365-2842.1986.tb00677.x.
A photographic technique was used to determine the instantaneous centre of rotation of a fixed unilateral distal extension partial denture and the teeth to which it was attached. The teeth involved were the lower canine and first premolar. When the two crowns were splinted together to provide support, both vertical and lateral saddle movement was reduced. Saddle support using only the first premolar produced a centre of rotation in the sagittal plane below the canine crown--which became located anterior to the canine when the two supporting teeth were splinted together. In the coronal plane, canine support produced an axis of rotation buccal to, and outside the confines of, the model; splinting of the canine and first premolar caused the centre of rotation in this plane to be located buccally and superior to the abutment tooth roots. The more posteriorly the saddle was loaded, the greater was the magnitude of the resultant movement.
采用摄影技术来确定固定单侧远中游离端局部义齿及其所附着牙齿的瞬时旋转中心。涉及的牙齿为下颌尖牙和第一前磨牙。当将两个牙冠固定在一起以提供支持时，垂直和侧向鞍基移动均减少。仅使用第一前磨牙进行鞍基支持时，矢状面内的旋转中心位于尖牙冠下方，而当两个支持牙固定在一起时，旋转中心则位于尖牙前方。在冠状面内，尖牙支持产生的旋转轴位于模型颊侧且超出模型范围；尖牙与第一前磨牙固定在一起会使该平面内的旋转中心位于颊侧且高于基牙牙根。鞍基加载越靠后，合成移动的幅度就越大。
