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889 results on '"Swain, Michael V."'

15. Influence of Citric Acid Concentration and Etching Time on Enamel Surface Roughness of Prepared Human Tooth: in vitro Study

Author

Sadyrin, Evgeniy V., Kislyakov, Evgeniy A., Karotkiyan, Roman V., Yogina, Diana V., Drogan, Ekaterina G., Swain, Michael V., Maksyukov, Stanislav Yu., Nikolaev, Andrey L., Aizikovich, Sergei M., Öchsner, Andreas, Series Editor, da Silva, Lucas F. M., Series Editor, Altenbach, Holm, Series Editor, Brünig, Michael, editor, and Kowalewski, Zbigniew L., editor

Published
2020
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29. Mechanical heterogeneity of dentin at different length scales as determined by AFM phase contrast

Author

Bertassoni, Luiz E, Marshall, Grayson W, and Swain, Michael V

Subjects
Physical Sciences, Condensed Matter Physics, Bioengineering, Bone Demineralization Technique, Chemical Phenomena, Dentin, Elasticity, Humans, Mechanical Phenomena, Microscopy, Atomic Force, Molar, Surface Properties, Viscosity, AFM, Phase, Collagen, Mechanical properties, Materials Engineering, Interdisciplinary Engineering, Microscopy, Condensed matter physics
Abstract

In this study we sought to gain insights of the structural and mechanical heterogeneity of dentin at different length scales. We compared four distinct demineralization protocols with respect to their ability to expose the periodic pattern of dentin collagen. Additionally, we analyzed the phase contrast resulting from AFM images obtained in tapping mode to interrogate the viscoelastic behavior and surface adhesion properties of peritubular and intertubular dentin, and partially demineralized dentin collagen fibrils, particularly with respect to their gap and overlap regions. Results demonstrated that all demineralization protocols exposed the gap and overlap zones of dentin collagen fibrils. Phase contrast analyses suggested that the intertubular dentin, where the organic matrix is concentrated, generated a higher phase contrast due a higher contribution of energy dissipation (damping) than the highly mineralized peritubular region. At increasing amplitudes, viscoelasticity appeared to play a more significant contribution to the phase contrast of the images of collagen fibrils. The overlap region yielded a greater phase contrast than the more elastic gap zones. In summary, our results contribute to the perspective that, at different length scales, dentin is constituted of structural features that retain heterogeneous mechanical properties contributing to overall mechanical performance of the tissue. Furthermore, the interpretation of phase contrast from images generated with AFM tapping mode appears to be an effective tool to gain an improved understanding of the structure and property relationship of biological tissues and biomaterials at the micro- and nano-scale.

Published
2012

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