歯科用合金と床用レジンとの接合性に関する研究
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As it is well known, the connection between the artificial teeth and metal plate in cast metal plate dentures is made by a resin material which is also used for the alveolar part of the denture for esthetic reasons. The bonding mechanism between alloy and resin involves a mechanical union between the two which requires an undercut or any other retentive device that can strengthen the force of adhesion. However, in dentures used for a long time, the finishing line (the line formed by the connection of alloy and resin) will develop a crevice, with alloy and resin separating due to external forces such as masticatory pressure. Also, discoloration results and the crevice may develop bacterial contamination. All of these area part of the problem which exists in the connection of resin and metal surface in the denture. Considering the problem, the author tried a method of etching the metal to strengthen the mechanical union between metal and resin and to prevent their separation. Three alloys were used in these experiments : Co-Cr, Ni-Cr, and Ni-Co-Cr. The resin used was a heat-curing type known an URBAN. The results of experiments were as follows : 1. Bonding strength between the etched surface and resin : Surface roughness increased as the etching time was prolonged. An increase in tensile strength was also noted with increasing etching time. For example, the Co-Cr alloy tested at 201±14kg/cm^2 (max. value after 120 minutes) ; Ni-Cr, 101±9kg/cm^2 (max. value after 120 minutes) ; and Ni-Co-Cr, 202±F10 kg/cm^2 (after 30 minutes etching). 2. SEM observations and EPMA and ESCA analysis ; Different surface conditions of the three alloys were revealed after the etching process. Only the chromium component of the various alloys remained after theetching process. Acid treatment of the three alloys revealed differing resistance to corrosion by these alloys. 3. Inhibition of dye penetration : The specimens were soaked in a 0.25% basic fuchsin solution for 2 weeks. With Co-Cr and Ni-Co-Cr alloys, the dye did not penetrate, while in the case of the Ni-Cr alloy, there wassome staining. 4. Effect of thermal cycling : The tensile strength value after 18 cyclings of the specimen was 167 kg/cm^2 for the Co-Cr alloy ; 68 kg/cm^2 for the Ni-Cr alloy ; and 198 kg/cm^2 for the Ni-Co-Cr alloy. The results indicated a decreasing bonding strength with increasing numbers of thermal cycles. 5. SEM photographs showed different shaped, corroded areas of 50 μm deepth in the connection region of each specimen. The Co-Cr and Ni-Co-Cr alloys had columnar-shaped corrosion areas, whereas the corrosion sites of the Ni-Cr alloy had the appearance of smooth hills and valley. 6. Clinial application : The effect of etching the metal plates in dentures was tested in 16 cases. After 2 172 years, the etched portion of the dentures showed abetter inhibition of dye penetration than the control (non-etched) parts. This suggests that etching may be of value in clinical dentistry.
- 日本補綴歯科学会の論文
- 1982-10-01
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