Do preheated composite resin or adhesive resin layer strengthen the feldspar ceramic?

Autor: Ferreira MC; Professor, School of Dentistry, Meridional Faculty, ATITUS, Passo Fundo, Rio Grande do Sul, Brazil; Post-Graduate student Program in Dentistry, School of Dentistry, University of Ribeirão Preto, UNAERP, Ribeirão Preto, São Paulo, Brazil., Alessandretti R; Professor, MSciD Post-Graduate Program in Dentistry, School of Dentistry, Meridional Faculty - IMED, Passo Fundo, Rio Grande do Sul, Brazil., Pereira GKR; Professor, MSciD-PhD Post-Graduate Programs in Oral Science, Prosthodontics Units, Federal University of Santa Maria, Santa Maria, Rio Grande do Sul, Brazil., Bacchi A; Professor, MSciD Post-Graduate Program in Dentistry, Paulo Picanço School of Dentistry - FACPP, Fortaleza, Ceará, Brazil., Maroli A; Professor, School of Dentistry, Meridional Faculty - ATITUS, Passo Fundo, Rio Grande do Sul, Brazil., Gomes ÉA; Professor, MsciD Post-Graduate Program in Dentistry, School of Dentistry, University of Ribeirão Preto - UNAERP, Ribeirão Preto, São Paulo, Brazil., Spazzin AO; Professor, MSciD Post-Graduate Program in Dentistry, School of Dentistry, Meridional Faculty - ATITUS, Passo Fundo, Rio Grande do Sul, Brazil. Electronic address: aloisio.spazzin@atitus.edu.br.
Jazyk: angličtina
Zdroj: The Journal of prosthetic dentistry [J Prosthet Dent] 2024 Sep; Vol. 132 (3), pp. 627-635. Date of Electronic Publication: 2022 Oct 04.
DOI: 10.1016/j.prosdent.2022.08.014
Abstrakt: Statement of Problem: Preheated composite resin and adhesive coating have been recommended as luting agents for ceramic veneers; however, information about the mechanical behavior of feldspathic porcelain veneers after using these methods is still limited.
Purpose: The purpose of this in vitro study was to evaluate the influence of the use of preheated composite resin or an adhesive resin layer on the strengthening of a feldspathic porcelain.
Material and Methods: Feldspathic porcelain disks were fabricated (N=210), etched (10% hydrofluoric acid for 90 seconds), and bonded according to resin-based luting agents (30 per group) for the biaxial flexural strength tests: photopolymerized resin cement, flowable composite resin, preheated composite resin, with or without previous adhesive coating. Characteristic strength and Weibull modulus were calculated. The viscosity of the luting agents was measured by using isothermal analyses. Finite element analysis simulated the flexural test. Fractographic and bonded interfaces were observed.
Results: The use of preheated composite resin led to the lowest stress levels in the feldspathic porcelain veneers. However, it did not increase the ceramic strengthening compared with other luting agents, as higher values were observed with flowable composite resin (P<.05). The use of an adhesive resin layer had no significant effect on ceramic strengthening when associated with preheated composite resin or resin cement (P>.05). Preheated composite resin presented the highest viscosity and led to incomplete filling of the porcelain surface irregularities. Failures originated on the ceramic surface subjected to tensile stress and were typically associated with pores at the ceramic-luting agent interface.
Conclusions: The use of preheated composite resin or an adhesive resin layer did not have a positive effect on strengthening feldspathic porcelain.
(Copyright © 2022 Editorial Council for The Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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