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KMID : 0362419990370050672
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Journal of Korean Academy of Prosthodontics
1999 Volume.37 No. 5 p.672 ~ p.686
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A STUDY OF INTERFACE AND CORROSION BEHAVIOR BETWEEN IMPLANT ABUTMENT AND CASTING GOLD ALLOY
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Son Mee-Kyung
Ma Jang-Seon
Chung Chae-Heon
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Abstract
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The purpose of this study was to compare the casting problem and corrosion behavior in two types of HL Hexed abutments of the Steri-Oss system : gold/plastic coping and gold coping. The anodic Polarization behavior, the galvanic corrosion between abutments and Type III gold alloys, before and after casting were analyzed, and the crevice corrosion of casting samples was analyzed with the CPPT test and the SEM. The results are as follows ; 1. Anodic polarization behavior of samples ; Before casting, gold/plastic coping and gold coping was shown to have a similar corrosion patterns. TypeIII casting gold alloy was shown to have a lower corrosion potential and passivation film. Corrosion potential of the case of gold/plastic coping after casting was higher than that of gold coping, but the region of passivation film for gold/plastic coping was smaller than that of gold coping. 2. Galvanic corrosion behavior of samples ; Contact current density between casting gold alloys and gold/plastic before casting was higher than that between gold coping and casting gold alloy. Galvanic corrosion of samples after casting was shown to have similar contact current density. 3. Crevice corrosion behavior of samples ; Crevice corrosion resistance of casting sample using gold coping was lower than that of casting sample using gold/plastic coping, and a severe corrosion pattern was observed at the abutment-casting gold alloy interface by the SEM.
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KEYWORD
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Gold coping, Gold/plastic coping, Casting alloy, Interface, Corrosion behavior crevice corrosion
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