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

在有部分齿状牙的口腔中，通过修复干预来恢复下颌的各种位置是我们日常所需要的。下颌最基本的位置是尖间位置，由前牙和磨牙的四个节段接触组成。这些恢复下颌尖间位置的关键接触被称为下颌的“支撑区”。这一系列研究的目的是为了阐明各种假体设计和程序如何有效地修复下颌骨的支撑区。在这次科学援助中，我们分析了以下问题，得到了以下结果。问题是；(1)各种固位体在自由端rpd中如何恢复下颌位置(2)自由端rpd压印程序的各种方法(3)基牙修复体的修复前处理对义齿支撑能力的影响；(4)义齿的排列方式对义齿支撑能力的影响。所得结果为：(1)固位体刚度越大，即具有良好的支撑力和设计良好的支撑作用，则义齿的支撑能力越好；(2)多压压印模技术在恢复游离端鞍的支撑方面比其他任何方法都更有效；(3)基冠和R.P.I.固位体在恢复游离端鞍的支撑方面效果更好；如果拮抗器不存在，或者拮抗器也是游离端鞍，则可以减少对有界基牙和鞍的力，建议不要对第二磨牙。

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.