Mohammed Mamdouh And Cherif Adel Mohsen,

ABSTRACT
Objectives. The Aim Of This Study Is To Evaluate The Influence Of Various Surface Treatments To Fibre Posts On The Microtensile Bond Strength With Different Composite Resins. Methods. Seventy Glass Fibre Posts Will Be Used In The Study. Posts Are Randomly Picked And Divide Into Five Groups Of 14 Each, Depending On The Post Surface Pretreatment To Be Performed. These Pre-treatments Include: Immersion In 20% Hydrogen Peroxide For 10 Min At Room Temperature And Silanization For 60 S (gp1), Immersion In 10 % Hydrogen Peroxide For 20 Min At Room Temperature And Silanization For 60 S (gp2), Immersion In 4% Hydrofluoric Acid Gel For 60s And Silanization For 60 S (gp3), Silanization Of The Post Surface For 60 S And Application Of The Bonding Agent (gp4), Silanization Of Post Surface For 60 S Only (gp5, Control Group). After Treatment, Two Posts Were Randomly Selected From Each Group To Evaluate The Morphological Aspect Of The Post Surface With Scanning Electron Microscopy. The Remaining Posts In Each Group Were Divided Into Five Subgroups Of Five Posts Each, Which Differed In The Type Of Composite Resin Used For The Core Build-up. Post-core Strength Was Calculated And The Differences Among Experimental Groups Were Analyzed With One And Two-way Anova And The Tukey Test (� =0.05). Results. The Post-core Strengths Achieved In Groups 4 And 1 Were Significantly Higher (P < 0.05), Than Those Of Groups 3, 5 And 2. The Post-core Strength In Group 2 Was Significantly Lower (P < 0.05) Than All Other Groups.