Abstract:

BACKGROUND: There are various current methods for nickel-titanium alloy modification, with the aim to gain broader clinical application according to clinical use requirements for nickel titanium alloy, based on various methods of increasing biological safety, biocompatibility and corrosion resistance of nickel-titanium alloy.
OBJECTIVE: To determine the adherence of streptococcus mutans and candida albicans on material surface and field planting number after advanced oxidization modification on nickel-titanium alloy, and to analyze the influence of advanced oxidization modification on the microbial adherence on alloy surface.
METHODS: Polished and modified nickel-titanium groups were placed in culture mediums which contained streptococcus mutans (type C, ATCC25175) and candida albicans (ATCC7661). After 24, 48 and 72 hours, the test pieces were taken out, the sample solution was diluted ten folds, 0.1 mL dilution solution was incubated in the culture medium, colony formation units were counted.
RESULTS AND CONCLUSION: As time passed, the microbial adhesion levels were increased both in the polished groups and the modified groups. At the same time, the adhesion level in modified groups was significantly less than that in polished groups  (P < 0.01). Advanced oxidation modification of nickel-titanium alloy in the oral environment can significantly inhibit the bacterial adhesion on the nickel-titanium alloy surface.