Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil; IBTN/Br - Institute of Biomaterials, Tribocorrosion and Nanomedicine, Brazilian Branch, Brazil.
Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas (UNICAMP), Av Limeira, 901, Piracicaba, São Paulo 13414-903, Brazil.
Mater Sci Eng C Mater Biol Appl. 2016 Feb;59:1079-1088. doi: 10.1016/j.msec.2015.11.045. Epub 2015 Nov 18.
The role of surface treatment on the electrochemical behavior of commercially pure titanium (cpTi) exposed to mouthwashes was tested. Seventy-five disks were divided into 15 groups according to surface treatment (machined, sand blasted with Al2O3, and acid etched) and electrolyte solution (artificial saliva — control, 0.12% chlorhexidine digluconate, 0.05% cetylpyridinium chloride, 0.2% sodium fluoride, and 1.5% hydrogen peroxide) (n = 5). Open-circuit-potential and electrochemical impedance spectroscopy were conducted at baseline and after 7 and 14 days of immersion in each solution. Potentiodynamic test and total weight loss of disks were performed after 14 days of immersion. Scanning electron microscopy, energy dispersive spectroscopy, white light interferometry and profilometry were conducted for surface characterization before and after the electrochemical tests. Sandblasting promoted the lowest polarization resistance (Rp) (P b .0001) and the highest capacitance (CPE) (P b .006), corrosion current density (Icorr) and corrosion rate (P b .0001). In contrast, acid etching increased Rp and reduced CPE, independent to the mouthwash; while hydrogen peroxide reduced Rp (P b .008) and increased Icorr and corrosion rate (P b .0001). The highest CPE values were found for hydrogen peroxide and 0.2% sodium fluoride. Immersion for longer period improved the electrochemical stability of cpTi (P b .05). In conclusion, acid etching enhanced the electrochemical stability of cpTi. Hydrogen peroxide and sodium fluoride reduced the resistance to corrosion of cpTi, independent to the surface treatment. Chlorhexidine gluconate and cetylpyridinium chloride did not alter the corrosive behavior of cpTi.
研究了表面处理对暴露于漱口水中的商用纯钛（cpTi）电化学行为的影响。将 75 个圆盘根据表面处理（机械加工、用 Al2O3 喷砂处理和酸蚀）和电解液（人工唾液-对照、0.12%葡萄糖酸氯己定、0.05%十六烷基吡啶氯、0.2%氟化钠和 1.5%过氧化氢）（n = 5）分为 15 组。在基线以及浸入每种溶液 7 和 14 天后进行开路电位和电化学阻抗谱测量。在浸入 14 天后进行动电位测试和圆盘总重量损失测量。在电化学测试前后进行扫描电子显微镜、能谱分析、白光干涉和轮廓测量，以进行表面特性分析。喷砂处理可降低最低极化电阻（Rp）（P b.0001）和提高最高电容（CPE）（P b.006）、腐蚀电流密度（Icorr）和腐蚀速率（P b.0001）。相比之下，酸蚀可提高 Rp 并降低 CPE，而与漱口液无关；而过氧化氢则降低 Rp（P b.008）并提高 Icorr 和腐蚀速率（P b.0001）。过氧化氢和 0.2%氟化钠的 CPE 值最高。浸泡时间延长可提高 cpTi 的电化学稳定性（P b.05）。总之，酸蚀可增强 cpTi 的电化学稳定性。而过氧化氢和氟化钠会降低 cpTi 的抗腐蚀性，而与表面处理无关。葡萄糖酸氯己定和十六烷基吡啶氯不会改变 cpTi 的腐蚀性行为。
