Water sorption of CH3- and CF3-Bis-GMA based resins with additives
J. appl. oral sci
; 20(4): 472-477, July-Aug. 2012. tab
Artigo
em Inglês
| LILACS
| ID: lil-650626
Biblioteca responsável:
BR1.1
ABSTRACT
OBJECTIVES:
To evaluate the effect of additives on the water sorption characteristics of Bis-GMA based copolymers and composites containing TEGDMA, CH3Bis-GMA or CF3Bis-GMA. MATERIAL ANDMETHODS:
Fifteen experimental copolymers and corresponding composites were prepared combining Bis-GMA and TEGDMA, CH3Bis-GMA or CF3Bis-GMA, with aldehyde or diketone (24 and 32 mol%) totaling 30 groups. For composites, barium aluminosilicate glass and pyrogenic silica was added to comonomer mixtures. Photopolymerization was effected by 0.2 wt% each of camphorquinone and N,N-dimethyl-p-toluidine. Specimen densities in dry and water saturated conditions were obtained by Archimedes' method. Water sorption and desorption were evaluated in a desorption-sorption-desorption cycle. Water uptake (%WU), water desorption (%WD), equilibrium solubility (ES; µg/mm³), swelling (f) and volume increase (%V) were calculated using appropriate equations.RESULTS:
All resins with additives had increased %WU and ES. TEGDMA-containing systems presented higher %WU, %WD, ES, f and %V values, followed by resins based on CH3Bis-GMA and CF3Bis-GMA.CONCLUSIONS:
Aldehyde and diketone led to increases in the water sorption characteristics of experimental resins.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Assunto principal:
Água
/
Bis-Fenol A-Glicidil Metacrilato
/
Resinas Compostas
Limite:
Humanos
Idioma:
Inglês
Revista:
J. appl. oral sci
Assunto da revista:
Odontologia
Ano de publicação:
2012
Tipo de documento:
Artigo
/
Documento de projeto