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KMID : 0362420110490010065
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Journal of Korean Academy of Prosthodontics
2011 Volume.49 No. 1 p.65 ~ p.72
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Surface roughness changes caused by the galvanic corrosion between a titanium abutment and base metal alloy
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Lee Jung-Jin
Song Kwang-Yeob
Ahn Seung-Geun
Park Ju-Mi
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Abstract
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PURPOSE: The purpose of this study was to evaluate the level of electro-chemical corrosion and surface roughness change for the cases of Ti abutment connected to restoration made of base metal alloys.
MATERIALS AND METHODS: It was hypothesized that Ni-Cr alloys in different compositions possess different corrosion resistances, and thus the specimens (13×13×1.5 mm) in this study were fabricated with 3 different types of metal alloys, commonly used for metal ceramic restorations. The electrochemical characteristics were evaluated with potentiostat (Parstat 2273A) and the level of surface roughness change was observed with surface roughness tester. Paired t-test was used to compare mean average surface roughness (Ra) changes of each specimen group.
RESULTS: All specimens made of nickel-chromium based alloys, average surface roughness was increased significantly (P < .05). Among them, the Ni-Cr-Be alloy (0.016 ± 0.007 μm) had the largest change of roughness followed by Ni-Cr (0.012 ± 0.003 μm) and Ni-Cr-Ti (0.012 ± 0.002 μm) alloy. There was no significant changes in surface roughness between each metal alloys after corrosion.
CONCLUSION: In the case of galvanic couples of Ti in contact with all specimens made of nickel-chromium based alloys, average surface roughness was increased.
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KEYWORD
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Galvanic corrosion, Surface roughness, Nickel-Chromium alloy, Titanium abutment
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