Abstract
This study analyzed the shear bond strength (SBS) of resin composite on zirconia surface to which a specific conditioner was applied before sintering. After sintering of either conditioner-coated or uncoated specimens, both groups were divided into three subgroups by their respective surface modifications (n = 10 per group): no further treatment; etched with hydrofluoric acid; and sandblasted with 50 µm Al2O3 particles. Surfaces were characterized by measuring different surface roughness parameters (e.g., Ra and Rmax) and water contact angles. Half of the specimens underwent thermocycling (10,000 cycles, 5–55 °C) after self-adhesive resin cement build-up. The SBSs were measured using a universal testing machine, and the failure modes were analyzed by microscopy. Data were analyzed by nonparametric and parametric tests followed by post-hoc comparisons (α = 0.05). Conditioner-coated specimens increased both surface roughness and hydrophilicity (p < 0.01). In the non-thermocycled condition, sandblasted surfaces showed higher SBSs than other modifications, irrespective of conditioner application (p < 0.05). Adhesive fractures were commonly observed in the specimens. Thermocycling favored debonding and decreased SBSs. However, conditioner-coated specimens upon sandblasting showed the highest SBS (p < 0.05) and mixed fractures were partially observed. The combination of conditioner application before sintering and sandblasting after sintering showed the highest shear bond strength and indicated improvements concerning the failure mode.
Highlights
Zirconia-based all-ceramic restorations have been used successfully in dental clinics along with dental computer-aided design/computer-aided manufacturing (CAD/CAM) systems [1]
The aim of this study was to analyze bonding via shear bond strength (SBS) testing between conditioner-coated zirconia surfaces modified with three different treatments and resin cement
The focus of this study was to evaluate the effect of a specific conditioner application to pre-sintered zirconia surfaces on bonding to resin cement
Summary
Zirconia-based all-ceramic restorations have been used successfully in dental clinics along with dental computer-aided design/computer-aided manufacturing (CAD/CAM) systems [1]. Zirconia is one of the most promising restorative materials because it shows very favorable mechanical properties and reasonable esthetics [2]. The clinical performance of zirconia-based fixed partial dentures (FPDs) showed a similar survival rate compared with that of metal-ceramic FPDs in the Materials 2016, 9, 518; doi:10.3390/ma9070518 www.mdpi.com/journal/materials. Chipping of veneering ceramics on zirconia-based FPDs was higher compared with that of metal-ceramic FPDs [6]. In in vitro reports, the bond strength between metal and veneering ceramics was higher compared with that between zirconia and veneering ceramics [7]
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call