Dentinal tubules driven wetting of dentin: Cassie-Baxter modelling |
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| Authors: | S M M Ramos L Alderete and P Farge |
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| Institution: | (1) Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA;(2) Paffenbarger Research Center, American Dental Association Foundation, National Institutes of Standards and Technology, Gaithersburg, MD 20899, USA;(3) School of Mechanical Engineering and Automation, Kyungnam University, 631-791 Masan, South Korea;(4) Department of Health Promotion and Policy, Baltimore College of Dental Surgery, University of Maryland, Baltimore, MD 21201, USA;(5) Department of Endodontics, Prosthodontics, and Operative Dentistry, Baltimore College of Dental Surgery, University of Maryland, Baltimore, MD 21201, USA;; |
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| Abstract: | We investigate the wetting properties of dentin surfaces submitted to a phosphoric acid etching followed by an air drying
procedure, as in clinical situations of adhesive dentistry. The surface topography of the etched surfaces was characterized
by AFM, and the wetting properties of water on these rough and heterogeneous surfaces were studied, by contact angle measurements.
We showed that the contact angle increases with the acid exposure time and consequently with both surface roughness and the
organic-mineral ratio of the dentin components. From the whole results, obtained on dentin and also on synthesized hydroxyapatites
samples, we inferred a water contact angle of ∼ 133° on the dentinal tubule. These experimental results may be described by the Cassie-Baxter approach, and it is suggested that small air pockets could be formed inside the dentinal tubules. |
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