模型実習用人工歯材料に対するコンポジットレジンの接着性
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概要
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In order to examine a possibility of typodont tooth materials for adhesive restoration approach in place of human tooth, the adhesive strength and the durability of 3 kinds of raw materials presently used for the typodont tooth were examined in comparison with those of human tooth. For these determinations, a shear adhesion test was performed after a specimen was kept in 37℃ distilled water for 24 hours followed by loading with a thermal cycle up to 10,000 times. The adhesion interface was then evaluated and observed by means of SEM. The following findings were obtained. 1. Adhesion strength at base line 1) Each composite resin tested was found to adhere most strongly to epoxy resin followed by melanin resin and UDMA resin. 2) Each composite resin tested was found to adhere almost equally or more strongly to epoxy resin as compared with human teeth ; however, the adhesiveness to the remaining 2 resins was lower than that to human teeth. 2. Adhesion durability 1) As to epoxy resin, each composite resins tested showed a similar tendency to that to human teeth to the extent of T.C 5,000. 2) As to melanin resin, each composite resin tested had a lower adhesiveness as compared with the adhesiveness to human teeth, showing a somewhat dissimilar tendency. 3) As compared with human teeth, UDMA resin showed a lower adhesion value as compared with human teeth with a dissimilar tendency as well. 3. Fracture mode of adhesion surface (a test group stored in 37℃ water for 24 hours) Though both cohesive and mixed fracture were observed with epoxy resin similarly to the human tooth, the remaining 2 resins showed only an interfacial failure. 4. A modest possibility as an alternative material for human teeth was indicated, however, it seemed necessary to use these materials in consideration of its differed adhesion mechanism from that in the case of human tooth substances.
- 2005-06-30