目的 观察含氟人工唾液对选择性激光熔积技术（SLM）制作的钴铬合金耐腐蚀性的影响。方法 将具有相同成分的钴铬合金粉末和金属块，分别运用SLM技术（SLM组）和铸造工艺（对照组）制作试件，每组40个。分别在pH 为5.0和2.5以及模拟口腔含氟0、0.05%、0.10%和0.20%的条件下，将试件置于Fusayam人工唾液中浸泡24 h。采用极化曲线Tafel外延法求得两组试样的极化阻力Rp值，比较两组试件的耐腐蚀性。结果 pH值为5.0时，在含氟0和0.05%的条件下，两组间Rp值比较差异无统计学意义（P>0.05）；而在含氟0.1%和0.2%的条件下，SLM组的Rp值显著大于对照组（P<0.05）。当pH为2.5时，在含氟0、0.05%、0.10%和0.20%的条件下，SLM组的Rp值均显著大于对照组（P<0.05）。结论 氟化物能影响钴铬合金的耐腐蚀性能，SLM钴铬合金的耐腐蚀性优于铸造钴铬合金。

Objective To evaluate the effects of different fluoride-containing artificial saliva solution on the corrosion of the dental cobalt-chromium (Co-Cr) alloy fabricated by selective laser melting (SLM). Methods The study involved two groups, each group has 40 cylinder specimens and all specimens were fabricated by the same Co-Cr alloy. One group adopted SLM, while the other group used the cast method. Under conditions of two different pHs (2.5 and 5.0) and four different fluoridecontaining artificial saliva solution concentration (0, 0.05%, 0.1%, and 0.2%), polarization curve tests were performed to compare the anti-corrosion ability of two groups. Results For pH of 5.0 (fluoride-containing artificial saliva solution concentrations were 0 and 0.05%), differences of Rp values between two groups were not statistically significant (P>0.05). For pH of 5.0 (fluoride-containing artificial saliva solution concentration were 0.1% and 0.2%) and pH of 2.5 (fluoride-containing artificial saliva solution concentration were 0, 0.05%, 0.1%, and 0.2%), the Rp value of SLM specimens were significantly higher than those of the cast ones (P<0.05). Conclusion Fluorine can affect the anti-corrosion ability of Co-Cr alloy. SLM specimens exhibited a significantly better anti-corrosion ability than cast ones.