The effect of silanization on shear bond strength of FRC posts to human dentin

To evaluate the bond strengths of FRC posts (Glassix "Nordin dental/Swiss" and Matchpost "RTD/ France") to root dentin after silanization. The null hypothesis tested was that silanization would produce greater bond strength. Roots of 40 human freshly extracted maxillary central incisors were endodontically treated and were divided into 4 group of each 10 (n=10.) They received the following treatments. Group 1: Glassix post + silane primer; Group 2: Glassix posts without silane primer; Group 3: Matchpost + silane primer; Group 4: Matchpost without silane primer. The posts were cemented with panavia F2.0 dual cure resin cement. Each root was cut into 3 slices (2mm height) representing 1/3 coronal, middle, and apical portions respectively. After push-out bond strength testing (at the cross head speed of 0.5 mm/min), the type of failure at the interface was determined. Silanization of fiber posts had no effect on shear bond strengh (p>0.05). Without consideration of silanization, type of post had also no effect. (p>0.05). The apical third of the specimen had the greatest bond strength (p=0.001) Neither silanization of fiber post surfaces, nor the type of fiber post seem to have any statistically significant difference on shear bond strength of FRC posts to root canal dentin. Most of tested specimen had an adhesive failure mode at the interface of cement-dentin.