Restroration of the "Supporting Zone" of the Mandible in partially Dentate Mouth.

在部分有齿的口腔中，通过修复介入恢复各种下颌位置是我们日常生活中的需要。最基本的下颌位置是牙尖间位置，由前磨牙和磨牙的四个节段性接触组成。这些恢复下颌尖间位置的关键接触点被称为下颌骨的“支撑区”。这一系列研究的目的是阐明不同的修复体设计和方法修复下颌骨支撑区的效果。在这项科学辅助下，我分析了以下几个问题，并得到了以下结果：(1)活体分析了游离端RPD下基牙和鞍部的咬合力分布。如果有界鞍座的黏膜支撑力是恒定的，则固位体的连接刚度会影响固位体的受力分布。连接的刚性越大，鞍座上的力分布越小。硬性套筒固位体的咬合力为20%，柔性钢丝固位体的咬合力为70%~80%，咬合接触修复下颌骨支撑区的准确性也受到咬合力分布的影响。使用刚性固位体的鞍部修复效果优于弹性固位体。(2)在颌间注册过程中，咬合力应尽量减小到咬合力最小的程度。在不同咬合边缘的患者中，这一点通过检查咬合方法和专门的咬合架得到了证实。

It is our daily requirement to restore the various madibular position by the prosthodontic intervention in the partially dentate mouth. The most basic madibular position is the intercuspal position, composed by the four segmental contacts in both premolar and molar teeth. These Key contacts in restoring the intercuspal mandibular position is called as "the Supporting Zone" of the mandible. The surpose of these series of study is to clarify how effective the supporting zone of the mandible will be restored by various prosthetic designs and procedures.In the term of this scientific aid, I have analyzed the following problems and have gotten the following results.(1) Occlusal force distribution both to the abutments and to the saddle under free-end RPD's. were analyzed in vivo. The force distribution was affected by connecting rigidity of the retainers selected if the mucosal support by the bounded saddle was constant. The more rigid the connection, the less the force distribution on the saddle was obtained. Occlusal force was 20% in rigid telescope retainers, while it was 70-80% in flexible wrought wire retainers.The accuracy of occlusal contacts effective in restoring the supporting zone of the mandible was also affected jst as occlusal force distribution. It was more effectively restored in the saddle with rigid retainers than with the flexible ones.(2) Occluding force should be minimized to the extent in tapping of jaws, in the procedure of intermaxillary jaw registration. This was verified in patients with various occlusal rims by check bite methods and the specialized articulators.