Abstract
The purpose of this study was to compare galvanic currents generated by different combinations of commonly used brackets and archwires. As-received stainless steel, nickel-titanium, and beta-titanium wires were coupled to stainless steel and titanium brackets in an artificial saliva medium. The galvanic current and amount of charge transferred for each pair were monitored with a zero resistance ammeter for 10 hours. Two-way analysis of variance (ANOVA) showed a significant difference in charge and galvanic currents when factored for type of bracket (P<0.001), but no significant difference between them when factored by type of wire (P>0.05). Specifically, a brazed stainless steel bracket was significantly greater in charge transferred and 10-hour galvanic current than metal injection molded stainless steel and titanium brackets (P<0.001), which were not different from each other (P>0.05). The method of bracket manufacturing might be of equal or more relevance to galvanic corrosion susceptibility than bracket composition.
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