氯离子对两种钴铬合金修复体离子析出行为的影响

Effects of Chloride Ion on the Ion Release of Two Kinds Co-Cr Alloy

目的:研究激光快速成形技术钴铬合金及铸造钴铬合金试件在不同氯离子浓度人工唾液中的离子析出行为。方法:采用激光快速成形技术制备钴铬合金试件24块,并以同种成分的铸造钴铬合金试件作对比,每种试件分为三组,分别浸泡于0.9%、2.0%及3.0%氯化钠浓度的人工唾液中,于第7、14、21、28、35、42、49、56天时检测人工唾液中试件的钴、铬离子析出浓度。结果:同种方法成形的试件,随着氯离子浓度升高,样本中的钴、铬离子析出量也增高,3.0%Na Cl浓度组离子析出量高于2.0%和0.9%Na Cl组,差异有统计学意义(P<0.05);氯离子浓度相同的人工唾液中,各时间点的激光快速成形技术钴铬合金离子析出量均低于铸造钴铬合金,在2.0%和3.0%Na Cl浓度时差异有统计学意义(P<0.05);随着时间的延长(前4周),2种钴铬合金的离子析出量逐渐增加,差异有统计学意义(P<0.05)。结论:激光快速成形技术钴铬合金的抗腐蚀性能优于铸造钴铭合金。

Objective： To investigate the ion release from Co-Cr alloys fabricated by laser rapid forming（LRF） and Co-Cr alloys formed by casting method in artificial saliva with different concentration of Cl-ion. Methods： Twenty-four LRF alloy specimens and twenty-four casting alloys were made, immersed in the artificial saliva with 0.9%, 2.0%, 3.0% Nacl respectively. The concentration of Co-ion and Cr-ion in the artificial saliva was measured on the day of 7th, 14 th, 21 st, 28 th, 35 th, 42 nd, 49 th and 56 th respectively. Results：When the Na Cl concentration increased, the release of Co-ion and Cr-ion in the artificial saliva also increased in both kinds of Co-Cr alloys. The ion release in the chloride concentration of 3.0% were higher than that in 0.9% and 2.0% Na Cl（P〈0.05）. In artificial saliva with the same concentration of Na Cl, release of Co-ion and Cr-ion in the LRF Co-Cr alloys were lower than that in the casting alloys at each time point, there was statistical difference between 2.0% and 3.0% Na Cl concentration（P〈0.05）. The release of Co-ion and Cr-ion increased gradually at the first four weeks, there was statistical difference between alloys（P〈0.05）. Conclusions： The LRF Co-Cr alloy has better corrosive resistance ability than the casting one.