INVESTIGATION OF CEMENT&Y-TZP BOND-STRENGTH AFTER DIFFERENT SURFACE TREATMENTS

Objectives: The aim of this study compare the bond strength between Y-TZP and five cements following different surface treatment techniques.
Methods: (2,1×2,1×1 cm) 10 zirconia specimens were prepared for shear bond strength from zirconia blocks (Ava Dent, Italy). First the specimens were divided into five surface treatment groups [control, zr primer, (Z-Prime, Bisco, Schaumburg, Israel), tribochemical silica covering with Rocatec (3M Espe, Germany), covering with AlN (H.C. Stark, Germany), and treating with laser (Fotono, Slovenia)]. Then, divided into five cement subgroups, [Panavia F 2.0 (Kuraray Medical, Japan), Super Bond (Sun Medical, Japan), G-Cem Automix (GC, Japan), Bifix QM (Voco, Liechtenstein), Poly F (Dentsply, Denmark)]. After surface treatment, cement (2mm×3mm) applied to the zirconia surface. All specimens were thermocycled for 5500 cycles between 5°C and 55°C. Shear bond test were performed in a universal testing machine. The bond strengths were recorded and statistically analyzed Shapiro-Wilk , ANOVA, (p<0.05).
Results: The mean SBS (shear bond strength) value for group ROC (16,42±5,59) is the highest bond strength value in all surface treatment groups independent of cement groups (p<0.05). Group CON (6,07±9,02) has the lowest value in surface treatment groups independent of cement groups (p<0.05). The mean SBS value for group POL (1,93±1,13) is the lowest and for group GC (13,53±7,51) is the highest bond strength value in all cement groups independent of surface groups (p<0.05).
Conclusions: Within the limitation of this in-vitro study for adhesive cementation protocol of zirconia restorations the tribochemical silica coating with Rocatec and using GCem cement is might be an alternative method.