Light transmittance through resin-matrix composite onlays adhered to resin-matrix cements or flowable composites.

Autor: Fidalgo-Pereira R; Center for Interdisciplinary Research in Health (CIIS), Faculty of Dental Medicine (FMD), Universidade Católica Portuguesa (UCP), 3504-505, Viseu, Portugal., Catarino SO; Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, 4800-058, Guimarães, Portugal; LABBELS - Associate Laboratory, University of Minho, Guimarães, 4710-057 Braga, Portugal., Carvalho Ó; Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, 4800-058, Guimarães, Portugal; LABBELS - Associate Laboratory, University of Minho, Guimarães, 4710-057 Braga, Portugal., Veiga N; Center for Interdisciplinary Research in Health (CIIS), Faculty of Dental Medicine (FMD), Universidade Católica Portuguesa (UCP), 3504-505, Viseu, Portugal., Torres O; Oral Pathology and Rehabilitation Research Unit (UNIPRO), University Institute of Health Sciences (IUCS), CESPU, 4585-116 Gandra, Portugal., Braem A; Department of Materials Engineering (MTM), Biomaterials and Tissue Engineering Research Group, KU Leuven, 3000 Leuven, Belgium., Souza JCM; Center for Interdisciplinary Research in Health (CIIS), Faculty of Dental Medicine (FMD), Universidade Católica Portuguesa (UCP), 3504-505, Viseu, Portugal; Center for MicroElectroMechanical Systems (CMEMS-UMinho), University of Minho, 4800-058, Guimarães, Portugal; LABBELS - Associate Laboratory, University of Minho, Guimarães, 4710-057 Braga, Portugal. Electronic address: jsouza@dem.uminho.pt.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2024 Mar; Vol. 151, pp. 106353. Date of Electronic Publication: 2023 Dec 28.
DOI: 10.1016/j.jmbbm.2023.106353
Abstrakt: Objective: The aim of this study was to evaluate the influence of the thickness of resin-matrix composite blocks manufactured by CAD-CAM on the light transmittance towards different resin-matrix cements or flowable composites.
Methods: Sixty specimens of resin-matrix composite CAD-CAM blocks reinforced with 89 wt% inorganic fillers were cross-sectioned with 2 or 3 mm thicknesses. The specimens were conditioned with adhesive system and divided in groups according to the luting material, namely: two dual-cured resin-matrix cements, two traditional flowable resin-matrix composites, and one thermal-induced flowable resin-matrix composite. Specimens were light-cured at 900 mW/cm 2 for 40s. Light transmittance assays were preformed using a spectrophotometer with an integrated monochromator before and after light-curing. Microstructural analysis was performed by optical and scanning electron microscopy (SEM). Nanoindentation tests were performed to evaluate mechanical properties for indirect evaluation of degree of monomers conversion.
Results: Optical and SEM images revealed low thickness values for the cementation interfaces for the traditional flowable resin-matrix composite. The cement thickness increased with the size and content of inorganic fillers. The highest light transmittance was recorded for the onlay blocks cemented with the traditional flowable resin-matrix composites while a group cemented with the dual-cured resin-matrix cement revealed the lowest light transmittance. The elastic modulus and hardness increased for specimens with high content of inorganic fillers as well as it increased in function of the light transmittance.
Conclusions: The light transmittance of flowable resin-matrix composites was higher than that for resin-matrix cement after cementation to resin-matrix composites blocks. The type, size, and content of inorganic fillers of the luting material affected the thickness of the cement layer and light transmittance through the materials.
Clinical Relevance: On chair-side light curing, the transmission of visible light can be interfered by the chemical composition and viscosity of the luting materials. The increase in size and content of inorganic fillers of resin-matrix composites and luting materials can decrease the light transmittance leading to inefficient polymerization.
Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: The authors declare no conflict of interest. The authors report financial support was provided by Foundation for Science and Technology.
(Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.)
Databáze: MEDLINE
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