磁性アタッチメント用キーパーの腐食と溶出

概要

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The junction between a keeper and joint alloys is based only on mechanical interlocking and no alloying layer is formed between them as seen in the usual casting junction. It may cause the keeper to come off the joint with continuing corrosion. The dissolution test showed corrosion occurred due to a difference in the electrode potential of the keeper and the joint alloys. The total amount of the metal species released from the alloys in a lactic acid solution (pH 2.3) were 52.22μg/cm^2/7days with gold-silver-palladium alloy 12S and 24.92μg/cm^2/7days with GP Type IV. The amount from Attract P was 14.19μg/cm^2/7days and this was found to be significantly lower than those with gold-silver-palladium alloy 12S and GP Type IV. As for metallic allergy due to dental alloys, it is desirable to keep the dissolution of alloys in the oral cavity as minimal as possible. In conclusion, it seems as if Attract P is a castable magnetic alloy serving the functions of both "root cap" and keeper with outstanding physical and chemical properties suitable for clinical use.
福岡歯科大学学会の論文
2009-03-31