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

本研究的目的是利用自行研制的直流电源(初始电压：400V，电流密度：0.2 mA/mm^2)，研究冷等离子体处理(CP处理)对工业纯钛和牙科银-钯合金表面处理的效果。考察了CP处理对树脂基胶结料粘结性能的影响，以及CP处理对金属底漆的吸附情况。CP处理显著提高了牙科金属的拉伸粘结强度。对钛进行3分钟的CP处理，对Ag-Pd合金进行10分钟的CP处理，均适合粘接。扫描电子显微镜观察表明，CP处理没有改变钛的表面织构。而经CP处理的Ag-Pd合金，由于等离子体刻蚀作用，表面出现明显的粗糙。用CP处理回收被人唾液污染的钛板。FT-IR表明，CP处理促进了金属底漆对钛的反应，从而去除了污染。

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.