Abstract: Objective To study the variation of the surface color of a new type of titanium alloy in simulated oral environment surface,and to provide clinical guidance for patients who have received titanium implant therapy or wear denture.Methods Titanium chips were prepared and divided into eight groups randomly.CIE L*a*b* of each specimen was examined by SPSS software before and after treatment.Results The surface color of the brushing group was more evident than that of the nonbrushing group (P＜0.01).The surface color change of Fluoridecontaining toothpaste group was more than that of nonfluoridecontaining toothpaste group,but the change was not statistically significant（P＞0.05）.pH value had a significant interactive effect with fluoride ionic concentration（P＜0.05）.Conclusions pH,fluoride ionic concentration,and tooth brushing all have an effect on the degree of corrosion.

Key words: titanium alloys, corrosion, surface color