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使用直流电激发4种工作气体(Ar,Ar/O2,Ar/O2/N2和He/O2)来产生等离子体,分别处理热凝树脂样本1,2,4,6,8,10分钟,每组9个样本。使用接触角测量仪测量处理前后各样本的接触角;利用发射光谱(OES)对等离子体的活性成分进行分析;采用X射线光电子能谱(XPS)分析其表面的元素价键改变。经过Ar,Ar/O2,Ar/O2/N2和He/O2等离子体处理后,热凝树脂表面的润湿性均显著增加,处理1分钟时,样本表面的接触角与原始值相比,显著减小(p<0.001),随着时间的延长,减小趋势变缓。OES结果显示等离子体的活性成分中包含有大量的·OH;XPS分析表明:经过等离子体处理后,热凝树脂表面的C元素与O元素的比例减小,有新的亲水性基团C—OH产生。大气压低温等离子体处理热凝树脂表面后,产生新的亲水性基团C—OH,从而增加表面亲水性。研究结果提示低温等离子体可能为临床上处理义齿基托树脂提供新方法。
Plasma was generated using four working gases (Ar, Ar / O2, Ar / O2 / N2 and He / O2) by direct current excitation and the thermoset resin samples were treated for 1, 2, 4, 6, 8 and 10 minutes, 9 samples. The contact angles of the samples before and after the treatment were measured by the contact angle measuring instrument. The active components of the plasma were analyzed by using the emission spectroscopy (OES). The elemental valence bond changes of the surface were analyzed by X-ray photoelectron spectroscopy (XPS). After the Ar, Ar / O2, Ar / O2 / N2 and He / O2 plasma treatments, the wettability of the thermosetting resin surface increased significantly, and the contact angle of the sample surface was significantly Decrease (p <0.001), and decrease with time. The results of OES show that the plasma contains a large amount of · OH. The XPS analysis shows that the ratio of C to O on the surface of the thermosetting resin decreases after the plasma treatment, and the new hydrophilic group C -OH production. Atmospheric pressure plasma treatment of the surface of the thermosetting resin, resulting in a new hydrophilic group C-OH, thereby increasing the surface hydrophilicity. The results suggest that low temperature plasma may provide a new method for the clinical treatment of denture base resin.