Tuna Süleyman Hakan, Karaca Erhan, Aslan İsmail, Pekkan Gürel, Pekmez Nuran Özçiçek
Department of Prosthodontics, Faculty of Dentistry, Süleyman Demirel University, Isparta, Turkey.
Department of Chemistry, Faculty of Science, Hacettepe University, Ankara, Turkey.
J Adv Prosthodont. 2020 Jun;12(3):114-123. doi: 10.4047/jap.2020.12.3.114. Epub 2020 Jun 18.
The aim of this study was to evaluate the corrosion resistance of the specimens produced by five different commercial metal laser sintering (MLS) systems with their recommended Co-Cr alloy powders.
The MLS machines and the alloy powders used were, ProX 100-ST2724G (St-Pro), Mysint 100-EOS SP2 (SP2-Mys), EOSINT 270-EOS SP2 (SP2-EOS), SLM 100-Starbond CoS (SB-SLM), and MLab Cusing-Remanium® Star (RS-MLab), respectively. Eight specimens from each group were prepared. Open circuit potential (E) and electrochemical impedance spectroscopy (EIS) measurements of polished surfaces of the specimens were conducted in a three-electrode cell using a potentiostat-galvanostat in Fusayama-Meyer artificial saliva (AS). Specimens from each group were immersed in AS and de-ionized water for seven days. E, charge transfer resistance (R) values, and released ions (µg/cm × 7d) in different solutions were determined. The specimen surfaces were observed with SEM/EDS. Results were analyzed statistically.
E values have shifted to potentials that are more positive over time. Steady-state E values were from high to low as follows, SB-SLM, SP2-Mys, SP2-EOS, RS-MLab, and ST-Pro, respectively. After 60 mins, RS-MLab specimens had the highest R value, followed by SP2-Mys, SB-SLM, SP2-EOS, and ST-Pro. In all groups, ion release was higher in AS than that in de-ionized water.
There were small differences among the corrosion resistances of the Co-Cr alloy specimens produced with MLS systems; meanwhile, the corrosion resistances were quite high for all specimens.
本研究旨在评估由五种不同的商用金属激光烧结（MLS）系统及其推荐的钴铬合金粉末所制备的试样的耐腐蚀性。
所使用的MLS机器和合金粉末分别为ProX 100 - ST2724G（St - Pro）、Mysint 100 - EOS SP2（SP2 - Mys）、EOSINT 270 - EOS SP2（SP2 - EOS）、SLM 100 - Starbond CoS（SB - SLM）和MLab Cusing - Remanium® Star（RS - MLab）。每组制备八个试样。使用恒电位仪 - 恒电流仪在三室电极池中，于舟山市正和人造唾液（AS）中对试样的抛光表面进行开路电位（E）和电化学阻抗谱（EIS）测量。每组试样在AS和去离子水中浸泡七天。测定不同溶液中的E、电荷转移电阻（R）值以及释放的离子（μg/cm×7天）。用扫描电子显微镜/能谱仪（SEM/EDS）观察试样表面。对结果进行统计学分析。
随着时间推移，E值已向更正的电位偏移。稳态E值从高到低依次为SB - SLM、SP2 - Mys、SP2 - EOS、RS - MLab和St - Pro。60分钟后，RS - MLab试样的R值最高，其次是SP2 - Mys、SB - SLM、SP2 - EOS和St - Pro。在所有组中，AS中的离子释放量高于去离子水中的离子释放量。
使用MLS系统制备的钴铬合金试样的耐腐蚀性之间存在微小差异；同时，所有试样的耐腐蚀性都相当高。
