SHEAR BOND STRENGTH OF THE INTRAORAL REPAIR SYSTEMS TO NEW CAD/CAM MATERIALS

Objectives: This study evaluated the shear bond strengths (SBS) of two intraoral repair systems on four commercially available CAD/CAM materials.
Methods: CAD/CAM blocks were sectioned with 2.5 mm thickness. Aged specimens (IPS e.max CAD, Vita Suprinity, Vita Enamic and Lava Ultimate; 5000 cycles, 5°-55 °C; n=80) were randomly divided into two groups according to the repair system: Ivoclar Repair Kit (37 % phosphoric acid + Monobond S + Heliobond + Tetric N Ceram) and Clearfil Repair System (40 % phosphoric acid + mixture of Clearfil Porcelain Bond Activator and Clearfil SE Bond Primer + Clearfil SE Bond + Filtek Z250). Resin composite was photo-polymerized on conditioned specimens. Each specimen was stored in distilled water at 37 °C for 24 h and then additionally aged for 5000 thermal cycles between 5 and 55 °C. The SBS was tested using a universal testing machine (0.5 mm/min). Two-way ANOVA was used to detect significance difference according to CAD/CAM material and intraoral repair system factors. Subgroup analyses were done by LSD post-hoc test.
Results: The results of two-way ANOVA indicated that SBS values varied significantly depending on restorative materials and intraoral repair systems (p<0.05). There were no significant differences between the SBS of two intraoral repair systems with CAD/CAM materials (p<0.05), except VS groups (p>0.05).
Conclusions: Highest bond strength values were observed in resin nano ceramic and dental hybrid ceramic blocks.