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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Prakki, Anuradha [1] ; Cilli, Renato [2] ; Vieira, Ian Matos [3] ; Dudumas, Kristina [1, 4] ; Pereira, Jose Carlos [5]
Total Authors: 5
[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
Total Affiliations: 5
Document type: Journal article
Source: Journal of Applied Oral Science; v. 20, n. 4, p. 472-477, JUL-AUG 2012.
Web of Science Citations: 3

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)

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