Comparison Of The Effect Of Surface Conditioning Methods On The Bond Strength Of Different Zirconia Reinforced Lithium Silicate And Hybrid Ceramics To Resin Cement

Abstract

OBJECTIVE. The objective of this study was to evaluate the effect of surface conditioning methods on shear bond strength (SBS) of a resin composite bonded to CAD/CAM materials.
 
 METHODS. The zirconia-reinforced lithium silicate (Vita Suprinity VS, and Celtra Duo CD) and hybrid ceramics (Vita Enamic, VE and Nacera Hybrid NH) were used. 80 specimens from each material were fabricated following the manufacturer’s instructions and divided into 8 groups according to surface treatments. These were; Gr 1 (control, no treatments (K)), Gr 2 (hydrofluoric acid H), Gr 3 (H+ Silane S), Gr 4 (abraded with 50-micron alumina particles A), Gr 5 (A+ S), Gr 6 (abraded with 30-micron Cojet sand C), Gr 7 (C+S), Gr 8 (S). The average surface roughness (SR) of the specimens was measured. Surface treated specimens were cemented to the resin cement (Panavia F 2.0) for testing the adhesion using the shear bond strength SBS test and were tested. Mean SR and SBS results were analyzed by 2-way ANOVA with the material type and surface treatments as the independent variables. 
 
 RESULTS. The highest surface roughness values were observed in the A and AS groups. Both hybrid ceramics VE and NH showed the highest SR values among surface treatments. The highest SBS values were found usually on the H and HS treated surfaces. The highest values were observed on the CD material in the HS group (18,01MPa) and followed by the VE material (16,25 MPa) in the CS group. The failure mode for CD and VS materials was found adhesive and cohesive failures and for VE and NH materials adhesive, and mixed cohesive failure was observed.
 
 CONCLUSION. The surface treatment showed a significant effect on the SR and SBS values. Although, the SR values of the materials are high in the A and AS group, the highest SBS values were observed in the H and HS treated surfaces.