Surface treatment and modification of dental prostheses using glow discharge treatment

我们使用实验开发的装置研究了辉光放电处理（GDT）对复合树脂与钛粘合的影响。所研制的GDT装置具有高压（最大6.5V）和高频（20 kHz）电源。在0.2Torr下对腔室抽真空之后，在0.4Torr的氩气环境下进行GDT，其中具有若干处理时间。GDT使纯钛板的温度升高到20 ℃，随着处理时间的延长，纯钛表面发生氧化。未处理的cpTi与蒸馏水的接触角为510，而GDT处理4-5 mm的cpTi与蒸馏水的接触角显著降低。细菌发光试验表明，GDT能显著降低细菌菌落数。扫描电子显微镜（SEM）观察显示，GDT去除了cpTi表面的有机物，但没有完全灭菌; 4种产品中有3种复合树脂与cpTi的结合强度随GDT的增加而增加，但产品间无显著性差异。这是因为粘结剂单体的粘结机理受粘结表面的吸附和粘结结构的影响，而不是润湿性本身。通过FT-IR-RAS光谱对cpTi表面吸附的单体进行了表征。吸附单体的光谱峰高在GDT处理和未处理之间没有差异。这些结果表明，我们需要更多的研究，如GDT治疗的持有和治疗条件，以将这种治疗应用于临床情况。

We -examined the effect of glow discharge treatment (GDT) on the bonding of composite resin to titanium using the experimentally developed device. The developed device for GDT has a power source with high voltage (6.5kv max) and high frequency (20kHz). After the chamber was vacuumed at O.2Torr, GDT was performed with several treatment time at argon gas environment of O.4Torr. Temperature of titanium (cpTi) plate rose by GDT until 20ﾟC.The surface of titanium was oxidized with longer time treatment. Contact angle of distilled water on cpTi with non treatment was 510, but that with GDT for 4-5 mm decreased significantly. Therefore, wettability was enhanced by GDT.Bacterium glowing test indicated GDT decreased the number of bacteria colony significantly. SEM image of the surface of cpTi demonstrated organic matter on the surface was removed by GDT.However, complete sterilization was not performed by GDT.Bonding strengths of cpTi to 3 composite resins among tested 4 products increased with GDT.However, significant difference was not appeared among the products. This was because the bonding mechanism of dental adhesive monomer was influenced by the adsorbed and bonding structures on the bonding surface rather than wettability itself. Adsorbed monomer was measured on the surface of cpTi by FT-IR-RAS spectrum. The peak height of the spectrum from adsorbed monomer was not different between that with GDT and that with non-treatment. These findings suggested that we need more investigation such as holding and treatment conditions of GDT treatment to apply this treatment to clinical situation.