Water sorption of CH3- and CF3-Bis-GMA based resins with additives

Autor(es)

Prakki, Anuradha ^[1] ; Cilli, Renato ^[2] ; Vieira, Ian Matos ^[3] ; Dudumas, Kristina ^{[1, 4]} ; Pereira, Jose Carlos ^[5]

Afiliação do(s) autor(es)

^[1] Univ Toronto, Fac Dent, Dept Clin Sci, Toronto, ON M5G 1G6 - Canada

^[2] Univ Fortaleza, Fac Dent, Dept Dent Mat & Operat Dent, Fortaleza, CE - Brazil

^[3] Univ Estadual Campinas, Piracicaba Sch Dent, Dept Restorat Dent, Piracicaba, SP - Brazil

^[4] Univ Toronto, Dept Human Biol, Toronto, ON M5G 1G6 - Canada

^[5] Univ Sao Paulo, Bauru Sch Dent, Dept Operat Dent Endodont & Dent Mat, Bauru, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Oral Science; v. 20, n. 4, p. 472-477, JUL-AUG 2012.
• Citações Web of Science: 3

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. (AU)

• Processo FAPESP: 08/06170-7 - Estabilidade da matriz dentinária através do tratamento com diferentes agentes de ligação cruzada, e seus efeitos na promoção de adesão em dentina.
• Beneficiário: Renato Cilli
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado