Influence of dimethyl sulfoxide used as a solvent on the physical properties and long-term dentin bonding of hydrophilic resins.

Autor: Stape TH; Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku, Lemminkaisenkatu 2, 20520 Turku, Finland; Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira Piracicaba, SP 13414-903, Brazil; Dental School of Presidente Prudente, University of Western São Paulo, Rua José Bongiovani, 700 - Cidade, Presidente Prudente, 19050-920 SP, Brazil. Electronic address: thiagohs@hotmail.com., Tezvergil-Mutluay A; Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku, Lemminkaisenkatu 2, 20520 Turku, Finland; Department of Restorative Dentistry and Cariology, Department of Prosthetic Dentistry, Institute of Dentistry, University of Turku, Turku, Finland. Electronic address: arztez@utu.fi., Mutluay MM; Adhesive Dentistry Research Group, Institute of Dentistry, University of Turku, Lemminkaisenkatu 2, 20520 Turku, Finland; Department of Cariology, Institute of Dentistry, University of Turku, Turku, Finland. Electronic address: mmutluay@gmail.com., Martins LR; Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira Piracicaba, SP 13414-903, Brazil. Electronic address: martins@fop.unicamp.br., do Prado RL; Dental School of Presidente Prudente, University of Western São Paulo, Rua José Bongiovani, 700 - Cidade, Presidente Prudente, 19050-920 SP, Brazil. Electronic address: rosanahb@yahoo.com.br., Pizi EC; Dental School of Presidente Prudente, University of Western São Paulo, Rua José Bongiovani, 700 - Cidade, Presidente Prudente, 19050-920 SP, Brazil. Electronic address: elianepizi@unoeste.br., Tjäderhane L; Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki, Finland; Helsinki University Hospital, Helsinki, Finland; Research Unit of Oral Health Sciences, and Medical Research Center Oulu (MRC Oulu), Oulu University Hospital and University of Oulu, Oulu, Finland. Electronic address: leo.tjaderhane@helsinki.fi.
Jazyk: angličtina
Zdroj: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2016 Dec; Vol. 64, pp. 220-8. Date of Electronic Publication: 2016 Jul 08.
DOI: 10.1016/j.jmbbm.2016.07.003
Abstrakt: Objective: 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 10wt%) 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 10wt% DMSO used as a two-step etch-and-rinse system. Dentin microtensile bond strength was determined at 24h and after two-year aging in artificial saliva at 37°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.
(Copyright © 2016 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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