Khaled Mohamed Adel, Zainab Diaa El-Din Soliman And Farid Sabry El-Askary,

ABSTRACT
Objective: To Evaluate The Effect Of Different Chemical Surface Treatments On The Shear Bond Strength (SBS) Durability Of Resin Cement To A Chair Side Indirect Resin Composite Material.

Materials and Methods: In Total, 200 Resin Composite Discs (4mmx4mm) And 200 Resin Composite Cylinders (2mmx4mm) Were Prepared And Divided Into 20 Experimental Groups According To The Two Experimental Factors In This Study; Factor 1, Surface Treatment, 10 Groups [No-Treatment (NT); No-Treatment+Silane (NT+S); 35% Phosphoric Acid Etching (AE); 35% Phosphoric Acid Etching+Silane (AE+S); 9.5% Hydrofluoric Acid (HF); 9.5% Hydrofuoric Acid+Silane (HF+S); 30% Hydrogen Peroxide (HP); 30% Hydrogen Peroxide+Silane (HP+S); 20% Potassium Permanganate (PP) And 20% Potassium Permanganate+Silane (PP+S)] And Factor 2: Storage Time, 2 Groups [24 Hours And 1-year]. After Each Respective Surface Treatment, Each Resin Composite Cylinder Was Bonded To A Resin Composite Disc Using A Dual-cured Resin Cement. Half Of The Specimens Were Stored In Distilled Water For 24 Hours And The Other Half Was Stored In Distilled Water For 1-year. The SBS Testing Was Run At A Cross-head Speed Of 0.5mm/minute. Data Were Statistically Analyzed Using Two-way ANOVA/Tukey HSD Test. Significant Level Was Set At P=0.05. Additional 5 Resin Composite Discs (7mmx2mm) Were Examined Under SEM To Evaluate The Surface Topography After Each Chemical Treatment.

Results: Two-Way ANOVA Showed That Factors ?surface Treatment?, ?storage Time? And ?surface Treatment X Storage Time? Had Significant Effect On SBS (P<0.001). The NT And PP Groups Showed The Significant Lower SBS Among All Surface Treatments Used (P<0.05). The SBS Was Dropped Significantly After 1-year Storage Time In All Surface Treatment Used (P<0.05).

Conclusions: The SBS Of The Dual-cured Resin Cement To The Chair-side Resin Composite Indirect Material Was Not Stable After 1-year Storage Period.