Abstract
Improving the bond strength of veneering ceramics to ZrO2-based cores remains a challenge. The purpose of this study was to evaluate the shear bond strength of different ZrO2 cores containing calcium silicate (CaSi) to veneering ceramics. Five types of ZrO2-based cores (n = 230) were divided into two groups: with or without oxygen plasma treatment. These were bound to two veneering ceramics (IPS e.max Ceram or VITA VM9). Shear bond strength of veneering ceramics to various cores was measured (n = 10), in addition to phase composition, surface morphology and contact angle of the cores. The results indicated that the plasma treatment had a significant effect on the water contact angle of the ZrO2-based cores, but had little effect on the bond strength. Regardless of plasma treatment, the highest strength value was recorded in the ZrO2 core specimen containing 20 wt % CaSi, when all cores were adhered to VITA VM 9 veneer. When using IPS e.max Ceram veneer, the shear bond strength of the plasma-treated 20 wt % CaSi-containing ZrO2 core was 16.6 ± 0.9 MPa higher than that of VITA In-Ceram YZ core control (13.4 ± 1.0 MPa) (p < 0.05). We conclude that the presence of 20 wt % CaSi in ZrO2 can improve the shear bond strength of zirconia-based cores to veneering ceramic.
Highlights
Zirconia (ZrO2 )-based ceramics have been widely used in implant systems and dental restorations because of their excellent mechanical properties, biocompatibility and chemical stability [1,2,3,4,5]
The increasing demand of patients for esthetic and metal-free restorations has driven the development of all-ceramic restorations consisting of zirconia core and ceramic veneer in clinical fixed prosthetics [4,6]
This study aimed to evaluate the veneering ceramics used in this study consisted of SiO -based feldspathic porcelains such influence of the calcium silicate (CaSi) dopant in the ZrO2 matrix on its 2shear bond strength to veneering as IPS e.max Ceram and VITA VM9
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Zirconia (ZrO2 )-based ceramics have been widely used in implant systems and dental restorations because of their excellent mechanical properties, biocompatibility and chemical stability [1,2,3,4,5]. The increasing demand of patients for esthetic and metal-free restorations has driven the development of all-ceramic restorations consisting of zirconia core and ceramic veneer in clinical fixed prosthetics [4,6]. The failure rate of the veneer-core dental restorations is very high [2]. Previous studies have reported that 15–25% of failure cases in all-ceramic restorations were due to chipping and cracking of the veneer layer [2]
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