Thermal and structural properties of commercial dental resins light-cured with blue emitting diodes (LEDs)
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
---|---|
Data(s) |
20/10/2012
20/10/2012
2010
|
Resumo |
We have investigated the thermal and structural properties of different commercial dental resins: Filtek(TM) Z-350, Grandio(A (R)), Tetric Ceram(A (R)), and TPH Spectrum(A (R)). The purpose of the present study was to evaluate quantitatively the photo-polymerization behavior and the effect of filler contents on the kinetic cures of the dental resins by using Differential Scanning Calorimetry (DSC) and Fourier Transform Infrared Spectroscopy (FT-IR) techniques. We have successfully obtained the low and high glass transition T (g) values of the dental composite resins from DSC curves. It was also observed a good agreement between the both T (g) values, activation energies from thermal degradation, and the degree of conversion obtained for all samples. The results have shown that Tetric Ceram(A (R)) dental resin presented the higher T (g) values, activation energy of 215 +/- A 6 KJ mol(-1), and the higher degree of conversion (63%) when compared to the other resins studied herein. FAPESP Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) CNPq Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) PRONEX/FINEP Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Financiadora de Estudos e Projetos (FINEP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) CAPES |
Identificador |
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY, v.99, n.1, p.263-268, 2010 1388-6150 http://producao.usp.br/handle/BDPI/29635 10.1007/s10973-009-0521-6 |
Idioma(s) |
eng |
Publicador |
SPRINGER |
Relação |
Journal of Thermal Analysis and Calorimetry |
Direitos |
restrictedAccess Copyright SPRINGER |
Palavras-Chave | #Degradation #Dental resins #DSC #FT-IR #Thermal analysis #FILLER CONTENT #COMPOSITE RESINS #CONVERSION #FRACTION #BEHAVIOR #Chemistry, Analytical #Chemistry, Physical |
Tipo |
article original article publishedVersion |