低温等离子处理对氧化锆粘接强度的影响

目的:研究低温等离子处理对氧化锆与树脂水门汀粘接强度的影响.方法:将80个氧化锆试件随机分为8组,每组10个:对照组(C),无处理.前处理剂组(PR),在氧化锆试件表面涂布前处理剂.喷砂组(SB),用Al2O3颗粒对氧化锆试件表面均匀喷砂.喷砂+前处理剂组(SBPR).低温等离子处理组(PL),将氧化锆试件中心置于常压喷出式低温等离子体发生器喷嘴下5mm处理10sec.低温等离子处理+前处理剂组(PLPR).喷砂+低温等离子处理组(SBPL).喷砂+低温等离子处理+前处理剂组(SBPLPR).分组处理后观察氧化锆试件表面形态,测量表面接触角及剪切粘接强度.结果:等离子处理组氧化锆试件表面形态未见明显改变,接触角明显减小.低温等离子处理组剪切粘接强度(16.81 MPa)明显高于对照组(9.41 MPa)和前处理剂组(10.28 MPa)(P＜0.05),与喷砂组(14.82 MPa)和喷砂+前处理剂组(18.34 MPa)相比差异无统计学意义(P＞0.05).喷砂+低温等离子处理+前处理剂组剪切粘接强度最高(23.95 MPa).XPS结果显示低温等离子处理使氧化锆试件表面氧元素(O)含量增加,碳元素(C)含量减少,碳/氧比值(C/O)减小.结论:低温等离子处理能显著的增加氧化锆表面的亲水性,显著提高氧化锆与树脂水门汀的粘接强度.

Effect of cold plasma treatment on the zirconia-resin cement bond strength

Objective:To evaluate the effect of cold plasma treatment on the bond strength between zirconia and resin cement.Methods:Eighty zirconia discs were randomly divided into eight groups (10 discs in each group) for different surface treatments:no surface treatment in Group 1 as a control;Primer,coated with Clearfil ceramic primer in Group 2.Sandblast,applied air abrasion with aluminum oxide particles in Group 3.Sandblast +Primer in Group 4.Cold plasma,put the discs under the nozzle with a distance of 5mm and treated with the cold plasma generated from the mixed gas of He (98％) and O2 (2％) for 10s in Group 5.Cold plasma+Primer in Group 6.Sandblast+Cold plasma in Group 7.Sandblast+Cold plasma+Primer in Group 8.Specimens of All the groups were surface treated prior to cementation with Panavia F 2.0 cement.Surface morphology and contact angle of water were measured.The shear bond strengths were tested and the failure modes were examined with a stereomicroscope.Results:Surface morphology showed no difference between the Cold plasma group and the Control group.The contact angle of water reduced after cold plasma treatment.The values of shear bond strength of specimens with cold plasma (16.81 MPa) were significantly higher than those with no treatment (9.41 MPa) and primer treatment (10.28 MPa).Sandblast+Cold plasma+Primer group showed the highest shear bond strength (23.95 MPa).XPS showed increase in O and decrease in C elements after cold plasma treatment.Conclusion:Zirconia specimen treated with cold plasma could significantly improve the hydrophilicity and the shear bond strength of zirconia.