关键词: 镍钛器械, 表面改性, 抗腐蚀性, 抗折性

Abstract:

Nickel-titanium instrument has been widely applied in root canal preparation due to its super elasticity and shape memory function. In recent years，surface treatment has become a hot clinical research because the release of nickel ion and instrument separation inhibit the further development of nickel-titanium alloy. Surface modification can result in the formation of bioactive film and inhibit the precipitation of nickel ion. In addition，surface modification can also enhance its corrosion resistance and biocompatibility. The methods of surface of modification include mechanical removal，surface oxidation and surface coatings，etc. The research advance of surface modification is reviewed in this article.

Key words: nickel-titanium instrument, surface modification, corrosion resistance, fracture resistance