H_2O_2溶液表面处理对纤维桩和树脂水门汀粘接强度的影响

Effect of H_2O_2 surface treatments on the bond strength between fiber posts and resin cement

目的评价不同浓度H_2O_2溶液表面处理对玻璃纤维桩与树脂水门汀粘接强度的影响。方法将25支POPO纤维桩随机分成5组:A组(对照组),B组(硅烷组),C组(10%H_2O_2+硅烷组),D组(20%H_2O_2+硅烷组),E组(30%H_2O_2+硅烷组)。将纤维桩与树脂水门汀粘接制作树脂块及薄片试件,将试件放在万能试验机上加载后算出粘接强度,体视显微镜观察破坏模式,统计学分析。结果各组粘接强度值为:A组(12.36±1.66)MPa,B组(12.76±1.59)MPa,C组(16.10±2.55)MPa,D组(19.19±2.81)MPa,E组(21.95±2.95)MPa。5组数据两两比较,除AB组比较无统计学意义(P>0.05),其余均有统计学意义(P<0.05)。结论仅用硅烷偶联剂对玻璃纤维桩进行表面处理的粘接强度并未提高;H_2O_2溶液处理后再涂硅烷偶联剂可提高玻璃纤维桩与树脂水门汀的粘接强度,随H_2O_2溶液浓度的增加,粘接强度增加增多。

Objective To evaluate the effect of H2O2 surface treatments on the bond strength between fiber posts and resin cement.Methods 25 POPO glass fiber posts were randomly separated into five groups： Group A（ control; no treatment）,Group B（ silanization）,Group C（ etching with 10% H2O2 and silanization）,Group D（ etching with 20% H2O2 and silanization）,Group E（ etching with30% H2O2 and silanization）. The posts were positioned into a mold to allow adhesive resin cement to be inserted,and to form resin blocks. Then resin block was cut to obtain 1-mm-thick specimens. The push-out tests were done at a cross-head speed of 0. 5 mm/min with a universal testing machine until failure occurred and data were analyzed using one-way ANOVA. The failure mode of each specimen was observed with stereomicroscope. Results The micro-push-out bond strength values of fiber post from group A to group E：（ 12. 36 ± 1. 66） MPa,（ 12. 76 ± 1. 59） MPa,（ 16. 10 ± 2. 55） MPa,（ 19. 19 ± 2. 81） MPa,（ 21. 95 ± 2. 95） MPa. Significant difference（ P〈0. 05） was found between each two groups except for Group A and Group B（ P〉0. 05）. Conclusions Silanization as the only surface treatment did not improve the bond strength,but the combination of H2O2 and silanization can enhance the bond strength,and with the concentration increased,the bond strength increased.