Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
Author(s):
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]
Total Authors: 6
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 15, n. 3, p. 397-402, MAY-JUN 2012.
Web of Science Citations: 5
Abstract

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)

FAPESP's process: 08/06170-7 - Dentin matrix stabilization following treatment with different crosslinking agents: Effect on dentin bonding.
Grantee:Renato Cilli
Support Opportunities: Scholarships in Brazil - Post-Doctoral