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| Id: |
lil-650626
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| Autor: |
Prakki, Anuradha; Cilli, Renato; Vieira, Ian Matos; Dudumas, Kristina; Pereira, José Carlos. |
| Título: |
Water sorption of CH3- and CF3-Bis-GMA based resins with additives |
| Fonte: |
J. appl. oral sci;20(4):472-477, July-Aug. 2012. tab.
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| Idioma: |
en.
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| Projeto: |
Fundação de Amparo à Pesquisa do Estado de São Paulo.
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| Resumo: |
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 AND METHODS: 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.
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| Descritores: |
Bis-Fenol A-Glicidil Metacrilato/química
Resinas Compostas/química
Água/química
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-Aldeídos/química
Diacetil/química
Teste de Materiais
Polimerização
Solubilidade
Fatores de Tempo
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| Limites: |
Humanos
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| Tipo de Publ: |
Research Support, Non-U.S. Gov't
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| Responsável: |
BR1.1 - BIREME
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