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Materials 2016, 9(7), 518; doi:10.3390/ma9070518

Influence of Pre-Sintered Zirconia Surface Conditioning on Shear Bond Strength to Resin Cement

1
Section Medical Materials Science & Technology, University Hospital Tübingen, Osiander Strasse 2-8, Tübingen 72076, Germany
2
Department of Prosthodontics, Center of Dentistry, Oral Medicine, and Maxillofacial Surgery, University Hospital Tübingen, Osianderstrasse 2-8, Tübingen 72076, Germany
3
Institute for Materials Science, University of Stuttgart, Pfaffenwaldring 2b, Stuttgart 70569, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 12 May 2016 / Revised: 21 June 2016 / Accepted: 21 June 2016 / Published: 25 June 2016
(This article belongs to the Section Biomaterials)
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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. View Full-Text
Keywords: zirconia; yttria-stabilized tetragonal zirconia polycrystal (Y-TZP); adhesion promoter; shear bond strength; surface modification; resin cement zirconia; yttria-stabilized tetragonal zirconia polycrystal (Y-TZP); adhesion promoter; shear bond strength; surface modification; resin cement
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Sawada, T.; Spintzyk, S.; Schille, C.; Zöldföldi, J.; Paterakis, A.; Schweizer, E.; Stephan, I.; Rupp, F.; Geis-Gerstorfer, J. Influence of Pre-Sintered Zirconia Surface Conditioning on Shear Bond Strength to Resin Cement. Materials 2016, 9, 518.

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