Effects of three luting agents and cyclic impact loading on shear bond strengths to zirconia with tribochemical treatment

Abstract

Background/purpose: The purpose of this study was to investigate the effects of cyclic impact loading on shear bond strengths of three different luting cements to zirconia. Materials and methods: The following cements were used in this study for bonding two zirconia blocks that were tribochemically silica-coated with the Rocatec system: Super Bond C&B (SB); Panavia Fluoro Cement (PF); and Fuji Luting (FL). Specimens were subsequently subjected to three storage conditions: 106 compressive cyclic impact loading (CL), 106 shear cyclic impact loading (SL), and no cyclic impact loading (Control) in distilled water at 37 °C with a mechanical fatigue testing device. Shear bond strength tests were performed with a universal testing machine. Results: Bond strengths of PF+Control (63.6±2.4 MPa) and PF+CL (57.2±3.8 MPa) were significantly higher than those with SB and FL. There was no significant difference between CL and SL (P>0.05) with SB and FL. The bond strength of the FL resin-modified glass ionomer cement was significantly lower than those with PF and SB. After applying tribochemical treatment, all specimens subjected to cyclic impact loading exhibited cohesive failure in the resin cement. Conclusions: After 106 compressive cyclic impact loading, the highest bond to zirconia was obtained with 10-methacryloxydecyl-dihydrogenphosphate containing a luting system (Panavia Fluoro Cement). After applying tribochemical treatment to zirconia, all cements used in this study survived more than 106 shear or compressive cyclic impact loading at 10 kg.

Keywords

• bond strength
• cyclic impact loading
• resin cement
• tribochemical treatment
• zirconia