Surface treatment applied cold plasma to dental metals and analysis of structural changes of the treated surface

本实验的目的是利用实验开发的直流电源设备（初始电压：400V，电流密度：0.2mA/mm^2），研究冷等离子体处理（CP处理）对商用纯钛和牙科Ag-Pd合金表面处理的有效性。考察了CP处理对树脂基水泥粘接性能的影响以及对金属底漆的吸附情况。CP处理可显著提高牙用金属的抗拉结合强度。CP处理3分钟对钛、10分钟对Ag-Pd合金均适合键合。扫描电镜观察发现CP处理对钛的表面织构没有影响。CP处理后的Ag-Pd合金表面出现了明显的等离子体腐蚀现象。用CP处理回收了被人唾液污染的钛板。傅里叶变换红外光谱表明，CP处理增强了金属底漆对钛的反应，以去除污染物。

The purpose of this sturdy was to investigate the effectiveness of surface treatment to commercial pure titanium and dental Ag-Pd alloy applied by cold plasma treatment (CP treatment) using the experimentally developed equipment having a DC power supply (Initial voltage: 400V, Current density: 0.2mA/mm^2). Treatment effect to bonding characteristics of resin-based luting cement and adsorption situation of metal primer by CP treatment were also examined. Tensile bond strength of dental metals was increased by CP treatment significantly. CP treatment for three minutes to titanium, and that for ten minutes to Ag-Pd alloy were was suitable for bonding. SEM observation appeared CP treatment did not change the surface texture of titanium. However, the surface of Ag-Pd alloy after CP treatment showed significant rough surface by plasma-etching effect. Titanium plates contaminated with human saliva recovered by CP treatment. FT-IR indicated CP treatment enhanced the reaction of the metal primer to titanium in order to remove the contamination.