The Study On The Effect Of Bond Strength Between Glass Fiber Posts Treated With H₂O₂and Resin Cement In Vitro

Objectives：To evaluate the effect of H₂O₂surface processing technology on the push-outbond strength between glass fiber posts and the resin cement．Methods：Eighteen Tenax glass fiber posts and eighteen Matchpost glass fiber posts wereassigned to two groups according to different brand.Group one （Tenax glass fiberposts）were randomly assigned to six groups according to the surface treatments.Group A1,no surface treatment; Group B1, treat with silane agent; Group C1, treatwith3%Hydrogen peroxide,then with silane agent; Group D1, treat with10%Hydrogen peroxide,then with silane agent; Group E1, treat with20%Hydrogenperoxide,then with silane agent; Group F1, treat with30%Hydrogen peroxide,thenwith silane agent. Group two（Matchpost glass fiber post）were randomly assigned tosix groups according to the surface treatments.Group A2, no surface treatment; GroupB2, treat with silane agent; Group C2, treat with3%Hydrogen peroxide,then withsilane agent; Group D2, treat with10%Hydrogen peroxide,then with silane agent;Group E2, treat with20%Hydrogen peroxide,then with silane agent; Group F2, treatwith30%Hydrogen peroxide,then with silane agent. Posts were adhesived using theresin cement to form Cylindrical resin block.Each resin block was sectioned to sevensections of1mm thick．A push-out test was performed on all specimens of eachgroup to measure bond strengths．Date were analyzed with ANOVA and the failuremodes were examined with stereomicroscope.Results:The microtensile bond strength values of Tenax glass fiber post from A1toF1:（22.35±3.43）MPa,（22.75±1.92）MPa,（27.21±3.60）MPa,（32.32±2.19）MPa,（36.15±2.32）MPa,（40.51±2.37）MPa;The microtensile bond strength values of Matchpostglass fiber post from A2to F2:（17.29±3.23） MPa,（17.01±3.18） MPa,（20.48±2.11）MPa,（23.60±2.60）MPa,（27.65±3.77）MPa,（30.52±2.99）MPa.Significant difference （P <0.05） was showed between every two groups except for A1and B1groups （P>0.05）in Tenax glass fiber post.Significant difference （P <0.05） was showed between everytwo groups except for A2and B2groups （P>0.05） in Matchpost fiber post. Failure-modes of specimens were mainly mixed damage in two glass fiber post.Conclusions:No difference （P>0.05） was showed between treat with silane agent andControl group.Treat with3%or10%or20%or30%Hydrogen peroxide then withsilane agent are more useful to improve the adhesion of the glass fiber post,and withthe concentration increased, the bond strength increases.