Your browser doesn't support javascript.
loading
Influence of polymeric matrix on the physical and chemical properties of experimental composites
GONÇALVES, Flávia; BOARO, Leticia Cristina Cidreira; MIYAZAKI, Caroline Lumi; KAWANO, Yoshio; BRAGA, Roberto Ruggiero.
  • GONÇALVES, Flávia; Universidade Ibirapuera. Faculdade de Odontologia. São Paulo. BR
  • BOARO, Leticia Cristina Cidreira; Universidade Ibirapuera. Faculdade de Odontologia. São Paulo. BR
  • MIYAZAKI, Caroline Lumi; Universidade Ibirapuera. Faculdade de Odontologia. São Paulo. BR
  • KAWANO, Yoshio; Universidade Ibirapuera. Faculdade de Odontologia. São Paulo. BR
  • BRAGA, Roberto Ruggiero; Universidade Ibirapuera. Faculdade de Odontologia. São Paulo. BR
Braz. oral res. (Online) ; 29(1): 1-7, 2015. tab, ilus
Artículo en Inglés | LILACS | ID: lil-777197
ABSTRACT
Nowadays, the main reasons for replacement of resin-based composite restorations are fracture or problems with the integrity of their interface, such as marginal staining, microleakage, or secondary caries. The aim of the present study was to evaluate the influence of the organic matrix on polymerization stress (PS), degree of conversion (DC), elastic modulus (E), flexural strength (FS), Knoop hardness (KHN), sorption (SP), and solubility (SL). In order to obtain a material which combines better mechanical properties with lower PS, seven experimental composites were prepared using BisGMA to TEGDMA molar ratios of 28, 37, 46, 55, 64, 73 and 82 and 40% of silica. PS was obtained in a universal testing machine, using acrylic as bonding substrate. DC was determined using Fourier Transform Raman spectroscopy. E and FS were obtained by the three-point bending test. KHN was measured by a microindentation test using a load of 25 g for 30 s. SP and SL were assessed according to ISO 4049. The data were submitted to one-way ANOVA. The increase in BisGMA concentration resulted in the decrease of PS, DC, E, FS and KHN. However, it did not change the SP and SL values. FS, E and KHN showed a strong and direct relationship with the DC of the materials. The composite material with a BisGMA to TEGDMA molar ratio of 11 was the one with better mechanical properties and lower PS.
Asunto(s)


Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Polietilenglicoles / Ácidos Polimetacrílicos / Resinas Compuestas / Análisis del Estrés Dental / Polimerizacion / Metacrilatos Idioma: Inglés Revista: Braz. oral res. (Online) Asunto de la revista: Odontología Año: 2015 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: Universidade Ibirapuera/BR

Similares

MEDLINE

...
LILACS

LIS


Texto completo: Disponible Índice: LILACS (Américas) Asunto principal: Polietilenglicoles / Ácidos Polimetacrílicos / Resinas Compuestas / Análisis del Estrés Dental / Polimerizacion / Metacrilatos Idioma: Inglés Revista: Braz. oral res. (Online) Asunto de la revista: Odontología Año: 2015 Tipo del documento: Artículo País de afiliación: Brasil Institución/País de afiliación: Universidade Ibirapuera/BR