弾性裏装材が咬合力および義歯沈下量に及ぼす影響に関する研究 : (下顎両側性遊離端義歯について)
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The present author examined five subjects aged from 25 to 50 (four males and one femal) for the purpose of obtaining information about their biting force and the depth of sinking of their denture bases. The method of examination he employed was a comparison of control dentures (not relined) and dentures relined, 1 mm thick with two kinds of resilient reliner : Low Temperature Vulcanization vinyl silicone (LTV silicone reliner hereafter) and Methyl Metacrylate resin system reliner (MMA reliner hereafter), the latter of which would be easily obtainable in the common market. The following are the results of his examination. 1. The biting force of the first and the second molars of the five subjects who had dentures inserted, relined by resilient reliner proved to be less than when they used non-relined dentures. 2. The biting force of the first molar tended to be greater than that of the second molar of dentures, and this tendency was not affected when their dentures were relined by resilient reliner. 3. In the cases of the first molars, the depth of sinking of the denture bases was 0.38 mm with dentures not relined by resilient reliner, 0.44 mm with those relined by LTV silicone reliner, and 0.50 mm with those relined by MMA reliner. As for the second molars, the depth was 0.29 mm with dentures not relined by resilient reliner, 0.39 mm with those relined by LTV silicone, and 0.48 mm with those relined by MMA reliner. The sinking depth of denture bases was greater when relined by MMA reliner than by LTV silicone reliner. 4. The relationship between biting force and the sinking depth of denture bases, both relined and non-relined dentures, showed that above about 6 Kg of biting force the sinking depth indicates no discrepancy between dentures relined and those not relined. 5. By applying finite element method, the following facts are obtained : 1) Stronger tensile and compression stresses inside the resin were observed in the cases of dentures relined by resilient reliner than those not relined. 2) Stresses transmitted to the cortical bones not affected by the presence of resilient relining materials.
- 社団法人日本補綴歯科学会の論文
- 1979-05-31
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