dos Santos Daniela Micheline, Vechiato-Filho Aljomar José, da Silva Emily Vivianne Freitas, Goiato Marcelo Coelho, Cesar Paulo Francisco, Rangel Elidiane Cipriano, da Cruz Nilson Cristino
J Adhes Dent. 2015 Aug;17(5):413-9. doi: 10.3290/j.jad.a35011.
The purpose of this study was twofold: 1) to characterize the zirconia (Y-TZP) surfaces through scanning electronic microscopy associated with energy-dispersive spectroscopy and atomic force microscopy after the deposition of a thin organosilicon film by nonthermal plasma (NTP) treatment, and 2) to determine the zirconia surface hydrophilicity, before and after aging, through surface energy analysis.
Surfaces of 16 zirconia disks (10 x 3 mm) were treated for 30 min each with hexamethyldisiloxane and argon plasmas, followed by oxygen plasma. Disks were analyzed before NTP treatment, immediately after NTP treatment, and after aging for 7, 15, and 30 days. The surface energy of the Y-TZP disks was measured with a goniometer. Quantitative data were submitted to statistical analysis using ANOVA and Tukey's test (p < 0.05).
Immediately after NTP treatment, the surface energy of the zirconia disks was significantly higher than at any other tested period (p < 0.001), and the water contact angle on the zirconia disks was reduced to 0 degrees. Similar surface energy results were obtained before NTP treatment and after 15 or 30 days of aging (p > 0.05; Tukey's test). Energy-dispersive spectroscopy results revealed the presence of carbon, oxygen, and silicon on the surface after NTP treatment.
NTP treatment was useful for treating the zirconia surface for cementation procedures, as it produced a high level of hydrophilicity on the zirconia surface. However, this high level of hydrophilicity did not persist after aging.
本研究有两个目的：1）通过扫描电子显微镜结合能量色散光谱和原子力显微镜对非热等离子体（NTP）处理沉积薄有机硅膜后的氧化锆（Y-TZP）表面进行表征，2）通过表面能分析确定老化前后氧化锆表面的亲水性。
16个氧化锆盘（10×3mm）的表面分别用六甲基二硅氧烷和氩等离子体处理30分钟，然后用氧等离子体处理。在NTP处理前、NTP处理后立即以及老化7、15和30天后对盘进行分析。用测角仪测量Y-TZP盘的表面能。定量数据采用方差分析和Tukey检验进行统计分析（p<0.05）。
NTP处理后立即，氧化锆盘的表面能显著高于任何其他测试时期（p<0.001），氧化锆盘上的水接触角降至0度。在NTP处理前以及老化15或30天后获得了相似的表面能结果（p>0.05；Tukey检验）。能量色散光谱结果显示NTP处理后表面存在碳、氧和硅。
NTP处理对于粘结过程中氧化锆表面的处理是有用的，因为它在氧化锆表面产生了高水平的亲水性。然而，这种高水平的亲水性在老化后没有持续存在。
