微波等离子体对基托材料表面结构的作用

Effect of microwave plasma on the surface structure of denture base resins

目的：观察微波等离子体对基托材料表面结构改变,为复合基托材料研制提供直接依据.方法：采用正交试验方法对80个试件分为16组,气体流量13.7cm3/min 在输出功率：100W、150W、200W、250W 气体种类：氧气、空气、氩气、氧气和氩气混合 气体压强：0.4、0.6、0.8、1kPa 处理时间：1、2、5、8 min,在不同的工作参数条件下等离子体对各组试样处理,扫描电镜观察表面结构.结果：镜下观察可见未经等离子体处理的样品表面较为平滑,有纵形条纹,而经等离子体处理后样品表面条纹呈现沟状,出现较多的缝隙,同时形成微小的凹槽,呈现少许剥脱状,表面粗糙度增加.结论：等离子体在基托材料表面发生刻蚀作用,使其表面变得粗糙不平,可以改善高分子树脂材料与硅橡胶二者之间的粘接固位问题.

Objective： To explore the effect of microwave plasma on surface structure of denture base resins and to provide a direct basis for development of composite base resins material. Methods ： Using orthogonal test method, 80 specimens were divided into 16 groups. The working conditions of plasma were set to： gas flow at 13.7cm3/min, output power at 100W, 150W,200W and 250W, gas sources as oxygen, air, argon, oxygen-argon mixture, gas pressure at 0.4kPa,0.6kPa,0.8kPa and 1 kPa,and processing time at 1,2,5 and 8 minutes. Each group of specimens were treated and observed for surface structure with scanning electron microscope. Results：The sample without plasma treatment appeared more smooth, with longitudinal stripes under scanning electron microscope, whereas the sample surface after plasma treatment showed stripe-shaped trenches and a number of cracks, while the formation of small grooves, and had little stripping-like, surface roughness increased. Conclusion：The base material surface became rough and uneven through the effect of plasma etching, so that it may improves adhesive between the polymer resin and silicone rubber.