Influence of thickness and degree of opacity of lithium disilicate on the degree of conversion and bond strength of resin cements.

Autor: Queiroz ME; Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University - UNESP, Araçatuba, SP, Brazil., Maluly-Proni AT; Department of Preventive and Restorative Dentistry, Araçatuba School of Dentistry, São Paulo State University - UNESP, Araçatuba, SP, Brazil., Tsutsumi MSC; Department of Preventive and Restorative Dentistry, Araçatuba School of Dentistry, São Paulo State University - UNESP, Araçatuba, SP, Brazil., Dallazen E; Department of Diagnosis and Surgery, Araçatuba School of Dentistry, São Paulo State University - UNESP, Araçatuba, SP, Brazil., de Castro-Hoshino LV; Department of Physics, State University of Maringá - UEM, Maringá, PR, Brazil., de Souza M; Department of Physics, State University of Maringá - UEM, Maringá, PR, Brazil., Baesso ML; Department of Physics, State University of Maringá - UEM, Maringá, PR, Brazil., Dos Santos PH; Department of Dental Materials and Prosthodontics, Araçatuba School of Dentistry, São Paulo State University - UNESP, Araçatuba, SP, Brazil; Dental Research Institute, University of Toronto, Faculty of Dentistry - UofT, Toronto, ON, Canada. Electronic address: pauloh.dossantos@utoronto.ca.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2023 Jul; Vol. 143, pp. 105934. Date of Electronic Publication: 2023 May 22.
DOI: 10.1016/j.jmbbm.2023.105934
Abstrakt: The aim of this study was to evaluate the influence of various opacities and thicknesses of lithium disilicate on the degree of conversion (DC) of two resin cements and on their bond strength (BS) to the ceramic. Two hundred and forty ceramic samples of lithium disilicate with high translucency (HT), low translucency (LT), and medium opacity (MO) were obtained from IPS e. max CAD in five different thicknesses. Light-cured and dual-cured resin cements were used for DC (n = 9) and BS (n = 8). Cement samples were light-cured under ceramic samples and analyzed using a Raman confocal spectrometer to determine the DC. For BS, resin cement cylinders were fabricated using ceramic samples which were thsen subjected to a microshear bond strength test. The mean values were provided for statistical analysis. The increase in thickness resulted in a decrease in DC for both cements under all experimental conditions, but only affected the BS of the light-cured cement for the MO ceramic. Comparing the opacities, the most translucent ceramics with particular thicknesses exhibited higher DC values than the less translucent ceramics. The LT and MO ceramics with certain thicknesses exhibited the highest BS values than the HT. The dual-cured cement generally showed highest values in both analyses than the light-cured cement. A thicker and more opaque ceramic material can reduce the DC of the cement. The BS decreases with the increasing thickness of the more-opaque ceramics.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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