Finite element analysis of deflections in major connectors for maxillary RPDs.

Finite element analysis of deflections in major connectors for maxillary RPDs.
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上颌 RPD 主要连接器偏转的有限元分析。

DOI：
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发表时间：
2002
期刊：
The International journal of prosthodontics
影响因子：
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通讯作者：
T. Ohyama
T. Ohyama
中科院分区：
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文献类型：
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作者：
M. Eto;N. Wakabayashi;T. Ohyama

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目的 通过三维有限元模型分析了模拟咬合载荷下主连接器设计对上颌可摘局部义齿 (RPD) 框架偏转的影响。 材料和方法 为肯尼迪 II 级案件生产了 13 个上颌主连接器。十一个框架由中线处具有不同前后宽度的后腭带组成。还构建了前后和马蹄形杆以进行比较。在每个框架中，邻接无牙牙槽嵴的基台上的咬合支托在垂直方向上固定，而对侧的支托在所有方向上固定。 20 N 的咬合力同时垂直分布在三个缺失的后牙位置上。 结果 对于后腭带，随着连接器宽度从 6 毫米增加到 29 毫米，鞍座处的最大垂直位移以及鞍座和鞍座附近其余部分的颊侧位移均减小，而最大远端位移对连接器宽度不敏感。前后宽度超过 18 毫米的后带显示出与前后杆相当的刚性。马蹄形杆和宽度较小的后带比其他框架表现出更大的位移。 结论 事实证明，刚性连接器能够最有效地将施加的咬合力传递到框架的对侧。
PURPOSE The effect of major connector design on deflection in maxillary removable partial denture (RPD) frameworks under simulated occlusal loading was analyzed by means of three-dimensional finite element models. MATERIALS AND METHODS Thirteen maxillary major connectors were produced for a Kennedy Class II case. Eleven frameworks consisted of posterior palatal straps with different anteroposterior widths at the midline. Anteroposterior and horseshoe bars were also constructed for comparison. In each framework, the occlusal rest on the abutment adjacent to the edentulous ridge was fixed in a vertical direction, and the rest on the contralateral side was fixed in all directions. A biting force of 20 N was vertically distributed simultaneously on each of the three missing posterior teeth locations. RESULTS For the posterior palatal straps, the maximum vertical displacement at the saddle and the buccal displacement at both the saddle and the rest adjacent to the saddle decreased as their connector width increased from 6 to 29 mm, whereas maximum distal displacements were insensitive to the connector width. The posterior straps with anteroposterior widths of more than 18 mm revealed comparable rigidity to the anteroposterior bar. The horseshoe bar and the posterior straps with smaller widths demonstrated greater displacements than the other frameworks. CONCLUSION The rigid connectors proved to be the most effective in transmitting applied occlusal forces to the contralateral side of the framework.