Effect of radiant exposure and UV accelerated aging on physico-chemical and mechanical properties of composite resins
| Autor: | Adriana Leticia Ancona-Meza, Eliezer Zamarripa-Calderón, Carine Tais Walter Meereis, Norma B. D'Accorso, Carlos Enrique Cuevas-Suárez, Ricardo L. Macchi |
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| Rok vydání: | 2018 |
| Předmět: |
DEGREE CONVERSION
Curing Lights Dental Aging Materials science Time Factors Surface Properties Ultraviolet Rays FLEXURAL STRENGTH Composite number Modulus Composite resins Water sorption Radiation Dosage Phase Transition Polymerization purl.org/becyt/ford/1 [https] 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine Flexural strength Reference Values Flexural Strength Materials Testing Spectroscopy Fourier Transform Infrared purl.org/becyt/ford/1.4 [https] Composite material General Dentistry Analysis of Variance MODULUS Water 030206 dentistry Photochemical Processes Accelerated aging Hydrolytic degradation lcsh:RK1-715 Solubility Reference values lcsh:Dentistry Microscopy Electron Scanning Water chemistry Original Article |
| Zdroj: | Journal of Applied Oral Science Journal of Applied Oral Science, Vol 27, Iss 0 (2019) Journal of Applied Oral Science v.27 2019 Journal of applied oral science Universidade de São Paulo (USP) instacron:USP CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1678-7765 |
| Popis: | Currently, there is no consensus in terms of defining the minimum radiant exposure values necessary for achieving adequate properties of composite resin. In addition, the long-term influence that radiant exposure has on the properties of composite resins is still questionable. Objective: The objective of this study was to evaluate the effect of radiant exposure and UV accelerated aging on the physico-chemical and mechanical properties of micro-hybrid and nanofilled composite resins. Material and Methods: A nanofilled (Filtek Supreme; 3M ESPE) and a micro-hybrid composite resin (Filtek Z250; 3M ESPE) were investigated under different radiant exposures (3.75, 9, and 24 J/cm2) and UV accelerated aging protocols (0, 500, 1000, and 1500 aging hours). The degree of conversion (DC), flexural strength (FS), modulus (M), water sorption (WS), and solubility (WL) were evaluated. The results obtained were analyzed using two-way ANOVA and Tukey's test. Comparisons were performed using a significance level of α=0.05. Results: The DC, FS, and M were found to be significantly influenced by both radiant exposure and accelerated aging time. The DC and EM increased with radiant exposure in the no-aging group (0-hour aging) for both micro-hybrid and nanofilled composites, whereas no correlation was found after accelerated aging protocols. WS and WL of micro-hybrid and nanofilled composite resins were scarcely affected by radiant exposure (p>0.05), whereas they were significantly reduced by accelerated aging (p |
| Databáze: | OpenAIRE |
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