Microstructure and mechanical properties of composite resins subjected to accelerated artificial aging.
The aim of this study was to investigate the influence of accelerated artificial aging (AAA) on the microstructure and mechanical properties of the Filtek Z250, Filtek Supreme, 4 Seasons, Herculite, P60, Tetric Ceram, Charisma and Filtek Z100. composite resins. The composites were characterized by Fourier-transform Infrared spectroscopy (FTIR) and thermal analyses (Differential Scanning Calorimetry - DSC and Thermogravimetry - TG). The microstructure of the materials was examined by scanning electron microscopy. Surface hardness and compressive strength data of the resins were recorded and the mean values were analyzed statistically by ANOVA and Tukey's test (α=0.05). The results showed significant differences among the commercial brands for surface hardness (F=86.74, p<0.0001) and compressive strength (F=40.31, p<0.0001), but AAA did not affect the properties (surface hardness: F=0.39, p=0.53; compressive strength: F=2.82, p=0.09) of any of the composite resins. FTIR, DSC and TG analyses showed that resin polymerization was complete, and there were no differences between the spectra and thermal curve profiles of the materials obtained before and after AAA. TG confirmed the absence of volatile compounds and evidenced good thermal stability up to 200 °C, and similar amounts of residues were found in all resins evaluated before and after AAA. The AAA treatment did not significantly affect resin surface. Therefore, regardless of the resin brand, AAA did not influence the microstructure or the mechanical properties.
Department of Dental Materials and Prosthesis, Dental School of Ribeirão Preto, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Andréa Cândido
AC
dos Reis
Department of Dental Materials and Prosthesis, Dental School of Ribeirão Preto, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Denise Tornavoi
DT
de Castro
Department of Natural Sciences, GPQM - Research Group of Chemistry Materials, UFSJ - Federal University of São João del Rei, São João del ReiMG, Brazil.
Marco Antônio
MA
Schiavon
Department of Dental Materials and Prosthesis, Dental School of Ribeirão Preto, USP - University of São Paulo, Ribeirão PretoSP, Brazil.
Leandro Jardel
LJ
da Silva
Department of Materials Engineering, Center for Exact Science and Technology, UFSCar - Federal University of São Carlos, São CarlosSP, Brazil.
José Augusto Marcondes
JA
Agnelli
D003188:Composite Resins / Q000737:chemistry*; D019245:Compressive Strength; D003799:Dental Stress Analysis; D006244:Hardness; D066298:In Vitro Techniques; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D058105:Polymerization; D012822:Silicon Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013818:Thermogravimetry; D013997:Time Factors; D014466:Ultraviolet Rays; D015040:Zirconium / Q000737:chemistry
C084111:Charisma composite resin; D003188:Composite Resins; C474035:Filtek Supreme; C444701:Filtek Z250; C443708:P60 Condensible Resin Composite; C121818:Tetric ceram; C083568:Z100 composite resin; C111840:flowable hybrid composite; C078906:Herculite Condensable; D012822:Silicon Dioxide; D015040:Zirconium