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Statement of the Problem: The clinical success of fixed dental prosthesis depends on the bond strength between the prepared tooth and the luting cement. Purpose: To estimate the bond strength of self-adhesive resin cement to dentin of prepared teeth using different conditioning methods. Materials and Methods: Mandibular first molars (n=32) periodontally compromised and indicated for extraction were collected after patient consent from oral surgery department, Faculty of Dentistry, Mansoura University. Flat dentin surfaces were prepared and treated as follows: (1) no pretreatment of dentin (T-NT) control group; (2) self-etching bonding agent (T-SEB); (3) Dentin conditioning agent (polyacrylic acid) (T-PA) (4) Ethylenediaminetetraacetic acid (EDTA) (TED). Self-adhesive resin cement (SuperCem), was used to lute discs of composite on conditioned prepared teeth surfaces. Specimens were stored in distilled water at 37 ̊C for 24 hours after that thermal cycling was performed between 5°C and 50°C in distilled water with a dwell time of 1 minute (Theromocycler, Robota, Alexandria, Egypt) for 10.000 cycles. Shear bond strength (SBS) was measured in MPa using a universal testing machine at a crosshead speed of 0.5 mm/min. Scanning electron microscope (SEM) was used for failure modes examination. Results: SPSS (22) was used for statistical analysis. One-way ANOVA and Tukey tests were used for comparing data at (p=0.001). The highest mean SBS (MPa) was reported for group T-SEB (3.9 MPa), while the lowest mean SBS value was observed for group T-NT (2 MPa). There was no statistically significant difference between group T-SEB (3.9 MPa) and group T-PA (3.3 MPa). Also there was no statistically significant difference between the other two test groups (T-NT=2 MPa, T-ED=2.6 MPa) (P>0.05). On the other hand there was statistically significant difference between group T-NT (2 MPa) and groups T-SE and T-PA groups (P<0.05). Conclusion: Conditioning of prepared dentin using self-etching adhesive or polyacrylic acid significantly increased the bond strength of self-adhesive resin cement.

IMPACT OF DENTIN CONDITIONING ON SHEAR BOND STRENGTH OF SELF-ADHESIVE RESIN CEMENT