Restoration of the 'Supporting Zone' of the Mandible in Partially Dentate Mouth

通过在部分有齿口腔中进行修复干预，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，由四个牙槽前和磨牙的节段性接触组成。这一系列研究的目的是为了阐明不同的假体设计和程序对修复下颌骨支撑区的效果。在这项科学辅助下，我们分析了以下问题并得到了以下结果：(1)各种固位体在游离端义齿修复中如何恢复下颌位置，(2)S游离端固位体的各种印模方法对义齿的支持能力有何影响，(3)基牙修复前的处理对义齿的支持能力有何影响，(4)义齿的排列方式对义齿的支持能力有何影响。(1)固位体具有越强的刚性，即良好的支撑力和良好的支撑作用，义齿的支承能力越好；(2)粘液压印技术在恢复游离端鞍部的支撑力方面比其他方法更有效；(3)基牙冠和RP.I.固位体在恢复游离端义齿的支撑力方面是有效的；(4)在游离端鞍部，最好不要对齐第二磨牙，如果没有对抗物，或者，对手也是自由端的鞍子，因为他们把力减少到有边界的基台和鞍座上。

It is our daily requirement to restore the various mandibular position by the prosthodontic intervention in the partially dentate mouth. The most basic mandibular position is the intercuspal position, composed by the four segmental contacts in both presolar and molar teeth. These Key contacts in restoring the intercuspal mandibular position is called as "the Supporting Zone" of the mandible.The purpose of these series of study is to clarify how effective the supporting zone of the mandible will be restored by the various prosthetic designs and procedures.In the term of this scientific aid, we have analyzed the following problems and have gotten the following results.The Problems were;(1)how the various retainers would restore the mandibular position in the free-end R.P.D.'s,(2)how the various methods of impression procedures of the free-end R.P.D.'s would affect the supporting ability of the dentures,(3)how the preprosthetic treatments on the abutment restorations would affect the supporting ability of the dentures and (4)how the arrangement of the artificial teeth would affect the supporting ability of the dentures.The results obtained were;(1)The more the retainer had the rigidity, that meant the good support and well designed bracing action, the more effective the supporting ability of the dentures,(2)The mucocompressive impression technique was more effective in restoring the support of the free-end saddles than any other methods,(3)The genuine mesio-distal parallerism in the abutment crowns and the R.P.I. retainers were effective in restoring the support of the free- end dentures,(4)In the free-end saddle, it was advisable not to align the second molar tooth, in case the antagonists did not exist, or the antagonists were also the free end saddle for the reason of reducing the force to the bounded abutments and saddles.