Abstract: Objective To evaluate the effect of H2O2 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% H2O2 and silanization）,Group D （etching with 20% H2O2 and silanization）,Group E （etching with 30% H2O2 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 H2O2 and silanization can enhance the bond strength,and with the concentration increased,the bond strength increased.

Key words: fiber post, H2O2, resin cement, surface treatment, silanization 