Properties of experimental resins based on synthesized propoxylated bis-GMA with different propionaldehyde ratios

Autor(es)

Denis, Aline Bassi ^[1] ; Guzzi Plepis, Ana Maria ^[1] ; Amaro Martins, Virginia da Conceicao ^[1] ; Pereira, Jose Carlos ^[2] ; Cilli, Renato ^[3] ; Prakki, Anuradha ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Chem Inst, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Bauru Dent Sch, Dept Operat Dent Endodont & Dent Mat, BR-17012901 Bauru, SP - Brazil

^[3] Univ Fortaleza UNIFOR, Fac Dent, Dept Dent Mat & Operat Dent, Fortaleza, Ceara - Brazil

^[4] Univ Toronto, Fac Dent, Restorat Dept, Toronto, ON M5G 1G6 - Canada

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 15, n. 3, p. 397-402, MAY-JUN 2012.
• Citações Web of Science: 5

Resumo

The effect of different propionaldehyde ratios on the properties of bis-GMA-based comonomers and copolymers diluted with propoxylated bis-GMA (CH3bis-GMA) was evaluated. Five experimental comonomers were prepared combining bis-GMA with CH3bis-GMA and propionaldehyde at 0, 2, 8, 16, 24 mol%. Light polymerization was effected with the use of 0.2 wt. (%) each of camphorquinone and N,N-dimethyl-p-toluidine. Resin degrees of conversion (%DC) were evaluated by FT-IR spectrophotometry and Tg by Differential Scanning Calorimeter. Complex viscosity (η*), the effect of temperature on η*, and Microhardness (H) for dry and wet samples were also determined. Data were analyzed by Student's t-test, one-way ANOVA and Tukey-Kramer test (α = 0.05). The group with 24 mol% additive had a significant increase in %DC and H, and the lowest comonomer Tg and η*. No remarkable variation was noted in copolymers Tg s. All resins presented Newtonian behavior of viscosity, which linearly decreased with increased temperature. The η* decreased sigmoidally as the additive ratio increased. (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