Abstract
Proanthocyanidin-based preconditioners were prepared by adding powdered proanthocyanidins-rich grape seed extract to various solvents at different concentrations. Demineralized dentin specimens were preconditioned for 20, 30, 60 or 120 s, followed by the evaluation of their cross-linking degree, mechanical properties and micromorphology. The cross-linking degree of the demineralized dentin collagen exhibited concentration- and time- dependent increase after preconditioning treatment, irrespective of the preconditioner and the solvent. When treated for the same exposure time, specimens after 15% proanthocyanidins preconditioning resulted in the highest mean ultimate tensile strength compared with all the other groups tested. Five percent glutaraldehyde control group produced the highest cross-linking degree, but the ultimate tensile strength was lower than that of 15% proanthocyanidins group. The field emission scanning electron microscopy confirmed that the demineralized dentin collagen was in a homogeneous and regular arrangement after preconditioning and maintained expanding, regardless of the surface moisture conditions.
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Acknowledgments
The study was supported by research funds from the Natural Science Foundation of China (No. 81000458 and No. 81130078). We greatly appreciate the assistance provided by Dr. Hou Rui for teeth collection and the Scientific Instruments Center in School of Stomatology for FESEM sample processing and imaging.
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Liu Rui-Rui and Fang Ming contributed equally to this work.
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Liu, R., Fang, M., Xiao, Y. et al. The effect of transient proanthocyanidins preconditioning on the cross-linking and mechanical properties of demineralized dentin. J Mater Sci: Mater Med 22, 2403–2411 (2011). https://doi.org/10.1007/s10856-011-4430-4
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DOI: https://doi.org/10.1007/s10856-011-4430-4