Reitz P V, Sanders J L, Caputo A A
J Prosthet Dent. 1984 Jan;51(1):19-23. doi: 10.1016/s0022-3913(84)80096-7.
A study was made to determine if the split palatal design of maxillary major connectors used on distal-extension removable partial dentures would result in a reduction of torquing stresses on the abutment teeth when the bases were loaded. A photoelastic model to simulate the maxillary arch, abutment teeth with their periodontal ligaments, edentulous ridges, and mucoperiosteum of the palate and ridges was constructed. Two Kennedy Class II removable partial denture frameworks of chrome-nickel alloy were constructed to fit the photoelastic model. One framework had an intact palatal major connector, and the other had a split in the major connector to separate the base from the abutment tooth as a stress-breaker. The frameworks were placed on the model, loaded, and photographed with polarized light to record the stress pattern in the model. The results of this study showed that the split palatal major connector did reduce the stress delivered to the distal-extension abutment when the base was loaded on the experimental model. A significant amount of stress from loading of the framework was removed from the abutment tooth and transferred to the regions of the model underlying the base.
进行了一项研究，以确定用于远中游离可摘局部义齿的上颌大连接体的裂开腭部设计在基托加载时是否会降低基牙上的扭转应力。构建了一个光弹性模型，以模拟上颌牙弓、带有牙周膜的基牙、无牙嵴以及腭部和牙槽嵴的黏膜骨膜。制作了两个铬镍合金的肯氏II类可摘局部义齿支架，以适配光弹性模型。一个支架的腭部大连接体完整，另一个支架的大连接体有一处裂开，将基托与基牙分开作为应力缓冲装置。将支架放置在模型上，加载并使用偏振光拍照，以记录模型中的应力模式。这项研究的结果表明，在实验模型上加载基托时，裂开的腭部大连接体确实降低了传递到远中游离基牙的应力。支架加载产生的大量应力从基牙上移除，并转移到模型中基托下方的区域。
