Artículos de revistas
Influence Of Dimethyl Sulfoxide Used As A Solvent On The Physical Properties And Long-term Dentin Bonding Of Hydrophilic Resins
Registro en:
Journal Of The Mechanical Behavior Of Biomedical Materials. Elsevier Science Bv, v. 64, p. 220 - 228, 2016.
1751-6161
1878-0180
WOS:000383526100021
10.1016/j.jmbbm.2016.07.003
Autor
Scarabello Stape
Thiago Henrique; Tezuergil-Mutluay
Arzu; Mutluay
Mustafa Murat; Marcondes Martins
Luis Roberto; do Prado
Rosana Leal; Gaya Pizi
Eliane Cristina; Tjaderhane
Leo
Institución
Resumen
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) To examine the feasibility of dimethyl sulfoxide (DMSO) incorporation into relatively hydrophilic resins as a new potential method to improve the durability of resin dentin bonds. Methods: Six experimental light-curing BisGMA/HEMA resins solvated in ethanol and DMSO with increasing concentrations of DMSO (0, 0.5, 1, 2, 4 and 10 wt%) were prepared. The degree of conversion (DC) was evaluated by Fourier Transform Infrared Spectroscopy (n=8); water sorption (Wsp) and water solubility (Wso) were gravimetrically assessed (n=10); and flexural strength (FS) and elastic modulus (E) were determined by a three-point bending flexural test (n=10). Flat dentin surfaces on sound third molars (n=10/group) were bonded with resins containing 0, 2, 4 and 10 wt% DMSO used as a two-step etch-and-rinse system. Dentin microtensile bond strength was determined at 24 h and after two-year aging in artificial saliva at 37 degrees C. Results: DMSO significantly affected Wsp (p=0.0006), DC, Wso, FS, and E (p <0.0001). In general, the resins' mechanical/physical properties were not affected by 2% or lower DMSO incorporation. Incorporation of 4% or higher DMSO content significantly increased DC, Wsp and Wso, but 2% or higher DMSO concentrations significantly reduced FS and E. No influence on immediate dentin bond strength occurred up to 4% DMSO incorporation. While 4% or higher DMSO concentrations impaired bond strength over time, the resin containing 2% DMSO presented significant higher dentin bond strength compared to the control resin after two year-aging. Significance: The use of DMSO as a new solvent in adhesive dentistry improves dentin bonding of relatively hydrophilic resins over time. 2% DMSO incorporation in BisGMA/HEMA resins should be sufficient to reduce bond strength loss without compromising polymer mechanical strength and physical properties. (C) 2016 Elsevier Ltd. All rights reserved. 64 220 228 CAPES CNPq Academy of Finland Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)