Jacobi R, Shillingburg H T, Duncanson M G
J Prosthet Dent. 1985 Aug;54(2):178-83. doi: 10.1016/0022-3913(85)90281-1.
Fixed partial dentures cemented to dies of adjustable mobility were subjected to repeated impacts at three different sites. Immobile abutments retained their prostheses longer than mobile abutments. Impacts that fell between the centers of rotation of the abutments were withstood longer than impacts that fell nearer the ends of the prostheses. This study failed to show a significant difference between the effect of impacts perpendicular to the occlusal plane and impacts angled 45 degrees toward the lingual plane. The results of this study suggest that (1) crowns that anchor rigid prostheses to mobile teeth require greater retentive ability than crowns on relatively immobile abutments and (2) occlusal impacts are best withstood when they fall on the areas of the fixed partial denture over and between the centers of rotation of the abutment teeth. If a fixed partial denture must withstand loading outside these areas, as is the case with cantilevered pontics and some tilted abutments, the retainer furthermost from the anticipated eccentric load must have exceptionally good retention.
将固定局部义齿粘结到可调节活动度的代型上，并在三个不同部位进行反复冲击。固定基牙比活动基牙保留其修复体的时间更长。落在基牙旋转中心之间的冲击比落在靠近修复体末端的冲击能承受更长时间。本研究未能显示垂直于咬合平面的冲击与向舌侧平面成45度角的冲击效果之间存在显著差异。本研究结果表明：（1）将刚性修复体固定到活动牙上的冠比相对固定基牙上的冠需要更大的固位能力；（2）当咬合冲击落在基牙旋转中心上方和之间的固定局部义齿区域时，最能承受。如果固定局部义齿必须承受这些区域之外的负荷，如悬臂桥体和一些倾斜基牙的情况，离预期偏心负荷最远的固位体必须具有特别好的固位力。
