el Charkawi H G, el Wakad M T
Cairo University, Egypt.
J Prosthet Dent. 1996 Sep;76(3):315-20. doi: 10.1016/s0022-3913(96)90178-x.
Previous reports have suggested that the restoration of distal extension edentulous areas with an extracoronal precision attachment partial denture necessitates splinting of abutments. However, the number of splinted teeth remains controversial. In this study, strain gauge technology was used to monitor stresses induced around the abutment and in the distal extension area under different loads as a function of the number of splinted abutments. Three strain gauges were installed in the outer buccal, lingual, and distal surfaces of the abutment to record stresses in the three planes of motion, and another gauge was placed under the distal extension base. The reduction of the number of splinted units from three to two resulted in an insignificant increase of stresses recorded, whereas reduction of the number from two to one resulted in a significant increase of stresses nine times greater than the three-unit splint values. On the basis of this in vitro model, at least two teeth on each side should be splinted when extracoronal distal extension attachment prostheses are used.
先前的报告表明，使用冠外精密附着体局部义齿修复远中游离端无牙区需要对基牙进行夹板固定。然而，夹板固定的牙齿数量仍存在争议。在本研究中，使用应变片技术监测不同负荷下基牙周围和远中游离端区域产生的应力，该应力是夹板固定基牙数量的函数。在基牙的颊侧外表面、舌侧和远中表面安装三个应变片，以记录三个运动平面中的应力，另一个应变片置于远中游离端基托下方。将夹板固定单位数量从三个减少到两个，记录到的应力增加不显著，而从两个减少到一个时，应力显著增加，比三个单位夹板固定值大九倍。基于这个体外模型，当使用冠外远中游离端附着体修复体时，每侧至少应夹板固定两颗牙齿。
