Igarashi Y
Bull Tokyo Med Dent Univ. 1975 Sep;22(3):207-20.
This study was done to evaluate the art of retaining the lower sub/complete, overlay denture, in relation to the abutment tooth mobility while the force was applied to the denture. The lower overlay denture was placed on a simulated model which was constructed of methylmethacrylate and silicone rubber. The author developed and used the special devices for measuring the tooth mobility. Results obtained were as follows: 1. When a force is applied directly to the abutment, the tooth mobility, i.e. the lateral excursion of the tooth, is markedly reduced according to the favorable ratio of the clinical crown to the root length. Splinting by the bar is effective to reduce the lateral excursion. 2. When a force is applied to the denture indirectly to the abutment tooth, the lateral excursion changes greatly according to the retainer selected. 3. The clasp retainer shows the greatest change in the lateral excursion against every loading on the denture. 4. All three types of bar attachment show the least value of lateral excursion.
本研究旨在评估在义齿受力时，保留下颌部分/全覆盖义齿的技术与基牙动度之间的关系。下颌覆盖义齿放置在由甲基丙烯酸甲酯和硅橡胶制成的模拟模型上。作者研发并使用了测量牙齿动度的特殊装置。获得的结果如下：1. 当直接对基牙施加力时，根据临床牙冠与牙根长度的有利比例，牙齿动度，即牙齿的侧向偏移，会显著降低。通过连接杆进行夹板固定可有效减少侧向偏移。2. 当间接对基牙施加力于义齿时，侧向偏移会根据所选固位体的不同而有很大变化。3. 卡环固位体在义齿承受每次加载时，侧向偏移的变化最大。4. 三种连接杆附着方式的侧向偏移值均最小。
