CAD-CAM milled versus pressed lithium-disilicate monolithic crowns adhesively cemented after distinct surface treatments: Fatigue performance and ceramic surface characteristics.

Autor: Schestatsky R; MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: ricoschestat@gmail.com., Zucuni CP; MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: camila-svs@hotmail.com., Venturini AB; MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: andressa.venturini@hotmail.com., de Lima Burgo TA; Department of Physics, Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: thiago.burgo@ufsm.br., Bacchi A; MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: atais.bacchi@imed.edu.br., Valandro LF; MSciD and PhD Post-Graduate Program in Oral Science (Prosthodontics Units), Federal University of Santa Maria (UFSM), Santa Maria, Rio Grande do Sul State, Brazil. Electronic address: valandrolf@gmail.com., Rocha Pereira GK; MSciD Graduate Program, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul State, Brazil. Electronic address: gabriel.pereira@imed.edu.br.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2019 Jun; Vol. 94, pp. 144-154. Date of Electronic Publication: 2019 Mar 09.
DOI: 10.1016/j.jmbbm.2019.03.005
Abstrakt: To evaluate the fatigue failure load (FFL), number of cycles for failure (CFF) and survival probabilities of lithium-disilicate (LD) monolithic crowns manufactured by two processing techniques (pressing vs. CAD/CAM) adhesively cemented to a dentin-analogue material, considering two surface treatments (conventional vs. simplified). Surface characteristics (topography, roughness and fractal dimensions) were also assessed. Forty (40) monolithic crowns were manufactured considering two specific processing techniques for each ceramic system: LD CAD - CAD/CAM lithium-disilicate (IPS e.max CAD, Ivoclar Vivadent); LD PRESS - pressed lithium-disilicate (IPS e.max Press, Ivoclar Vivadent). The crowns were adhesively cemented (Multilink Automix System, Ivoclar Vivadent) onto dentin analogue preparations considering two distinct protocols of surface treatments (conventional - hydrofluoric acid etching + silane application [HF+Sil] or simplified - etching with one-step primer (Monobond Etch&Prime, Ivoclar Vivadent) [EP]). The cemented assembly was stored in distilled water at 37 °C for 3 days and fatigue tests were run (step-stress approach: load ranging from 400 to 2000 N, step-size of 100 N, 15,000 cycles/step, 20 Hz). Fractography, surface topography, roughness, and fractal dimension analyses were performed. LD PRESS [EP] group depicted higher FFL, CFF and survival probabilities in comparison to LD CAD groups, regardless of the conditioning method. A tendency of higher Weibull modulus (mechanical reliability) was observed when using [EP] for both LD PRESS and LD CAD . SEM and AFM analysis showed very distinct initial surface patterns for the distinct processing techniques considered (LD CAD with higher fractal dimension and lower roughness than LD PRESS ), and both surface treatments distinctly affected these surface characteristics. All failures were radial cracks originating at the ceramic-cement interface. Pressed lithium-disilicate monolithic crowns showed better fatigue performance in comparison to CAD/CAM milled crowns, especially when they were treated with self-etching ceramic primer. The surface treatment with self-etching primer led to similar fatigue performance when compared to hydrofluoric acid plus silane application for the same processing technique, but it tended to provide higher mechanical reliability.
(Copyright © 2019 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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