Influence of BisGMA, TEGDMA, and BisEMA contents on viscosity, conversion, and flexural strength of experimental resins and composites


Autoria(s): GONCALVES, Flavia; KAWANO, Yoshio; PFEIFER, Carmem; STANSBURY, Jeffrey W.; BRAGA, Roberto R.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

19/10/2012

19/10/2012

2009

Resumo

Different monomer structures lead to different physical and mechanical properties for both the monomers and the polymers. The objective of this study was to determine the influence of the bisphenylglycidyl dimethacrylate (BisGMA) concentration (33, 50 or 66 mol%) and the co-monomer content [triethylene glycol dimethacrylate (TEGDMA), ethoxylated bisphenol-A dimethacrylate (BisEMA), or both in equal parts] on viscosity (eta), degree of conversion (DC), and flexural strength (FS). eta was measured using a viscometer, DC was obtained by Fourier transfer Raman (FT-Raman) spectroscopy, and FS was determined by three-point bending. At 50 and 66% BisGMA, increases in eta were observed following the partial and total substitution of TEGDMA by BisEMA. For 33% BisGMA, eta increased significantly only when no TEGDMA was present. The DC was influenced by BisGMA content and co-monomer type. Mixtures containing 66% BisGMA showed a lower DC compared with mixtures containing other concentrations of BisGMA. The BisEMA mixtures had a lower DC compared with the TEGDMA mixtures. The FS was influenced by co-monomer content only. BisEMA mixtures presented a statistically lower FS, followed by TEGDMA + BisEMA mixtures, and then by TEGDMA mixtures. Partial or total replacement of TEGDMA by BisEMA increased eta, which was associated with the observed decreases in DC and FS. Although the BisGMA content influenced the DC, it did not affect the FS results.

FAPESP[04/059750]

CNPq

Identificador

EUROPEAN JOURNAL OF ORAL SCIENCES, v.117, n.4, p.442-446, 2009

0909-8836

http://producao.usp.br/handle/BDPI/25792

http://apps.isiknowledge.com/InboundService.do?Func=Frame&product=WOS&action=retrieve&SrcApp=EndNote&UT=000268029400015&Init=Yes&SrcAuth=ResearchSoft&mode=FullRecord

Idioma(s)

eng

Publicador

WILEY-BLACKWELL PUBLISHING, INC

Relação

European Journal of Oral Sciences

Direitos

restrictedAccess

Copyright WILEY-BLACKWELL PUBLISHING, INC

Palavras-Chave #degree of conversion #physical properties #resin composite #DENTAL RESINS #CHEMICAL-STRUCTURE #PHOTOPOLYMERIZATION KINETICS #MECHANICAL-PROPERTIES #SHRINKAGE #MONOMERS #DENTISTRY #COPOLYMERIZATIONS #FORMULATION #POLYMERS #Dentistry, Oral Surgery & Medicine
Tipo

article

original article

publishedVersion