氧气等离子体处理提高软衬材料拉伸强度的作用

目的:评价低温氧气等离子体表面处理技术在提高软衬材料与基托材料间拉伸强度中的作用。方法:根据国家高分子聚合物拉伸试验标准(GB6328-86)制备20个PMMA块(8 mm×10 mm×30 mm)。粘结面用800目氧化铝砂纸磨平。10块用低温等离子体处理2 min,另10块作对照,所有标本用软衬材料两两粘结,48 h后用万能试验机进行拉伸试验,测试速度为10 mm/min。记录最大拉伸力值并在扫描电镜下观察断面。结果:经低温氧气等离子体处理后,软衬材料与PMMA间拉伸强度从2.837 Mpa升至5.259 Mpa(P<0.01)。结论:低温等离子体表面处理技术可用于提高软衬材料与PMMA间的拉伸强度。

Effect of O2-plasma treatment on tensile bond strength of soft denture liner

Objective:To evaluate the change of tensile bond strength between PMMA and soft denture liner after O_2-plasma treatment.Method:According to China National standard for tensile bond strength(GB 6328-86) 20 PMMA blocks measuring 8 mm thick,10 mm wide and 30 mm long were prepared.The surface to be bonded were smoothed on 800 grit aluminum oxide paper and 10 blocks were treated with O_2-plasma for 2 min.After polymerization,blocks were connected with soft liner.After 48 hours in air,all specimens were placed under tension until failure in a universal testing machine at a crosshead speed of 10 mm/min.The maximum tensile stress before failure and mode of failure were recorded.Result: After O_2-plasma treatment,the tensile bond strength between PMMA and soft Reverse had increased from 2.837 Mpa to 5.259 Mpa.Conclusion:The low temperature O_2-plasma treatment can be used to increase tensile bond strength between PMMA and Soft Reverse.