Galvanic Corrosion between Various Combinations of Orthodontic Brackets and Archwires
Format of Original
American Journal of Orthodontics and Dentofacial Orthopedics
Introduction: The purpose of this study was to compare galvanic currents generated by different combinations of commonly used brackets and archwires.
Methods: As-received stainless steel, nickel-titanium, and betatitanium 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.
Results: 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).
Conclusions: The method of bracket manufacturing might be of equal or more relevance to galvanic corrosion susceptibility than bracket composition.