低温等离子体表面处理对氧化锆陶瓷-树脂短期粘接强度的影响

The short-term effects of nonthermal plasma treatments on zirconia ceramic-resin bond strength

目的:研究不同等离子体处理对牙科氧化锆陶瓷表面短期粘接强度的影响。方法:制作氧化锆陶瓷试件,喷砂后随机分为5组,进行不同表面处理。A组:喷砂组;B组:喷砂+氧气(oxygen,O2)等离子体组;C组:喷砂+氩气(argon,Ar)等离子体组;D组:喷砂+氮气(nitrogen,N2)等离子体组;E组:喷砂+底涂剂Z-Prime Plus组。以扫描电子显微镜(scanning electron microscope,SEM)、能量色散谱仪(energy dispersive spectrometer,EDS)、原子力显微镜(atomic force microscope,AFM)和水接触角测试仪表征各处理组的氧化锆陶瓷表面形貌、碳氧元素含量、粗糙度和表面亲水性。制备复合树脂柱,以树脂水门汀将其粘固于处理后的氧化锆陶瓷表面,将粘接试件水浴24 h后,测试剪切粘接强度(shear bond strength,SBS),并分析破坏模式。结果:SEM显示不同等离子体处理陶瓷后表面形貌无明显变化,EDS显示碳元素减少,氧元素增加,碳/氧比值减小。水接触角测试表明等离子体改性后表面亲水性相比于A组明显增加。SBS结果表明,与A、B、D组相比,C组陶瓷短期SBS明显提高(P<0.05),与E组相比差异无统计学意义。结论:Ar等离子体表面处理可显著提高牙科氧化锆陶瓷-树脂的短期粘接强度。

Objective:This study aims to evaluate the short-term effects of different plasmas treatments on short-term bond strength of zirconia ceramic surface.Methods:Many pieces of zirconia ceramic slices were sandblasted and randomly divided into 5 groups based on different treatments.Group A,sandblast group;Group B,sandblast+oxygen(O2)plasma group;Group C,sandblast+argon(Ar)plasma group;Group D:sandblast+nitrogen(N2)plasma group;Group E:sandblast+Z-Prime plus group.The zirconia surface topography,contents of carbon and oxygen elements,roughness values,hydrophilicity were determined by scanning electron microscopy(SEM),energy dispersive spectrum(EDS),atomic force microscope(AFM)and water contact angle assay,respectively.And then composite resin columns were prepared and cemented on the pre-treated zirconia blocks with composite resin cement.Initial shear bond strengths(SBS)between zirconia and resin were measured after 24 h water storage.Failure modes were also analyzed.Results:There was no obvious difference in zirconia topography among testing groups.EDS showed that contents of carbon decreased and contents of oxygen increased after zirconia treated by different plasmas.Water contact angle test found that surface energy in groups treated with plasma was significantly improved comparing with group A.SBS test suggested that SBS in group C was similar as group E(P>0.05),and SBS in both of them were significantly increased compared with other groups(P<0.05).Conclusion:The short-term bonding strength of zirconia can be significantly increased after treated by Ar plasma.