Effect of the nanofilm-coated zirconia ceramic on resin cement bond strength.

Autor:	de Figueiredo VMG; Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil., Silva AM; Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil., Massi M; Department of Physics, Technical Institute Aerospace (ITA), Sao Jose dos Campos, Brazil., da Silva Sobrinho AS; Department of Physics, Technical Institute Aerospace (ITA), Sao Jose dos Campos, Brazil., de Queiroz JRC; Department of Biotechnology, UnP - Laureate University, Natal, Brazil., Machado JPB; Laboratory of Sensors and Materials (LAS), National Institute of Space Research (INPE), São José dos Campos, Brazil., do Prado RF; Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil., Junior LN; Department of Dental Materials and Prosthodontics, Institute of Science and Technology of São José dos Campos, São Paulo State University (UNESP), Sao Jose dos Campos, Brazil.
Jazyk:	angličtina
Zdroj:	Journal of dental research, dental clinics, dental prospects [J Dent Res Dent Clin Dent Prospects] 2022 Summer; Vol. 16 (3), pp. 170-178. Date of Electronic Publication: 2022 Nov 15.
DOI:	10.34172/joddd.2022.029
Abstrakt:	Background. New surface treatments have been proposed to expand the clinical indications of zirconia prostheses. This study aimed to evaluate the effect of silica and fluorine nanofilms on zirconia ceramic on the resin cement bond strength. Methods. Zirconia blocks and discs underwent different surface treatments: untreated zirconia (CON), sandblasted, silica-coated alumina particles (30 µm) (SC), silica nanofilm (SN), and fluorine nanofilm (FN). Nanofilm deposition was performed through plasma enhanced chemical vapor deposition (PECVD). Zirconia surfaces were characterized on disks by morphology (atomic force microscopy, AFM), chemical analysis (x-ray photoelectron spectroscopy, XPS), and contact angle analysis. A silane coupling agent was applied on each treated surface, and a cylinder of resin cement was built up. Half of the specimens in each group were submitted to 6000 thermal cycles (TC). Bond strength was analyzed using the shear test, and the fractographic analysis was performed with stereomicroscopy and SEM/EDS. Statistical analysis was performed through one-way ANOVA and Tukey test in the non-aged and aged specimens. Results. Nanofilms modified the zirconia surface, which became more hydrophilic and chemically reactive. Chemical bonding between Si-O was found in SN, and FN promoted a fluorination process on the ceramic surface, converting zirconia into zirconium oxyfluoride. Specimens of the SN (TC) group failed on pre-testing. FN (TC) bond strength (3.8 MPa) was lower than SC (TC) and CON (TC) after shearing. Adhesive failure predominated in the experimental groups. Silica nanofilm failure occurred after aging. Conclusion. Silica and fluorine nanofilms deposited by PECVD did not promote effective bonding between zirconia and resin cement. (©2022 The Author(s).)
Databáze:	MEDLINE
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