Abstract:

BACKGROUND: Ni-Cr alloy is widely used in dental field. A large number of experiments have been performed to study its mechanical properties, corrosion resistance and biocompatibility.
OBJECTIVE: To study the influence of N+ ion sputtering on bacteria adhesion of clinically used Ni-Cr alloy.
METHODS: A hundred and forty-four pieces of Ni-Cr alloy were made, and 72 were randomly chosen. Then N+ ion sputter was used to the surface modification of chosen Ni-Cr alloys as experimental group, while others served as controls. Strep. sanguis, Actinomyces viscosus, Candida albicans were adhered onto the surfaces of Ni-Cr alloys, and then the number of bacteria was assayed by means of clone forming unit (CFU) method.
RESULTS AND CONCLUSION: At 24, 48 and 168 hours, the number of the adhered Strep. sanguis, Actinomyces viscosus, Candida albicans was significantly reduced in N+ ion sputtering Ni-Cr alloy group (P < 0.001), indicating that N+ ion sputtering may reduce bacterium adhesion on Ni-Cr alloy.