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Title: Changes in resin-infiltrated dentin stiffness after water storage
Authors: S. Chiaraputt
S. Mai
B. P. Huffman
R. Kapur
K. A. Agee
C. K Y Yiu
D. C N Chan
C. Harnirattisai
D. D. Arola
F. A. Rueggeberg
D. H. Pashley
F. R. Tay
Srinakharinwirot University
Sun Yat-Sen University
Medical College of Georgia
The University of Hong Kong
Mahidol University
University of Maryland, Baltimore County
Keywords: Dentistry
Issue Date: 1-Jul-2008
Citation: Journal of Dental Research. Vol.87, No.7 (2008), 655-660
Abstract: Plasticization of polymers by water sorption lowers their mechanical properties in a manner that is predictable by the polarity of their component resins. This study tested the hypothesis that when adhesive resins were used to create resin-infiltrated dentin, the reductions in their flexural moduli after water storage would be lowered proportional to their hydrophilic characteristics. Three increasingly hydrophilic resin blends were used to fabricate polymer beams and macro-hybrid layer models of resin-infiltrated dentin for testing with a miniature three-point flexure device, before and after 1-4 weeks of water storage. Flexural modulus reductions in macro-hybrid layers were related to, and more extensive than, reductions in the corresponding polymer beams. Macro-hybrid layers that were more hydrophilic exhibited higher percent reductions in flexural modulus, with the rate of reduction proportional to the Hoy's solubility parameters for total intermolecular attraction forces (δt) and polar forces (δp) of the macrohybrid layers.
ISSN: 00220345
Appears in Collections:Scopus 2006-2010

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