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Chemical Bonding to Novel Translucent Zirconias: A Mechanical and Molecular Investigation.

Journal article
Authors Sebastian Franco Tabares
Victoria Franke Stenport
Lars Hjalmarsson
Pui Lam Tam
Carina B. Johansson
Published in The journal of adhesive dentistry
Volume 21
Issue 2
Pages 107-116
ISSN 1757-9988
Publication year 2019
Published at Institute of Odontology, Section 2
Pages 107-116
Language en
Links dx.doi.org/10.3290/j.jad.a42361
www.ncbi.nlm.nih.gov/entrez/query.f...
Subject categories Biomaterials Science

Abstract

To investigate direct bonding of a 10-MDP-based cement to two novel translucent yttria-stabilized tetragonal zirconia polycrystal ceramics (4Y-TZP, 5Y-TZP) and observe the influence of thermocycling on this bonding.Powders of presintered and isostatically pressed 5Y-TZP, 4Y-TZP and 3Y-TZP were mixed with a 10-MDP-based cement (Panavia F 2.0), then stored in deionized water for 48 h at 37°C or thermocycled 10,000 times. Raman spectroscopy and Fourier-transform infrared spectroscopy were used to assess the presence of a functional group (PO32-) that could indicate bonding before and after thermocycling. X-ray photoelectron spectroscopy was used to identify the presence of the suspected Zr-O-P bond in the same specimens. A shear-bond strength (SBS) test was conducted based on ISO 29022:2013.Marked peaks assigned to the asymmetric vibrations of the PO32- functional group were observed in both zirconias before and after thermocycling. The binding energy corresponding to Zr-O-P interactions (531.5 eV) was masked by the aluminosilicate in the filler of the cement. Shear bond strengths were approximately 20 MPa after water storage and approximately 6 MPa after thermocycling. No differences were found between the control group and the translucent zirconias.Direct bonding of the 10-MDP-based cement to both 4Y-TZP and 5Y-TZP was highly plausible. Both 4Y-TZP and 5Y-TZP may be promising alternatives to glass-ceramic restorations.

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