Fracture processes and mechanisms of crack growth resistance in human enamel |
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Authors: | Devendra Bajaj Saejin Park George D Quinn Dwayne Arola |
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Affiliation: | (1) Department of Mechanics, Shanghai University, 99 Shangda Rd, Shanghai, 200444, People’s Republic of China;(2) Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA;(3) Department of Endodontics, Prosthodontics, and Operative Dentistry, Baltimore College of Dental Surgery, University of Maryland, Baltimore, MD 21201, USA;; |
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Abstract: | Human enamel has a complex micro-structure that varies with distance from the tooth’s outer surface. But contributions from
the microstructure to the fracture toughness and the mechanisms of crack growth resistance have not been explored in detail.
In this investigation the apparent fracture toughness of human enamel and the mechanisms of crack growth resistance were evaluated
using the indentation fracture approach and an incremental crack growth technique. Indentation cracks were introduced on polished
surfaces of enamel at selected distances from the occlusal surface. In addition, an incremental crack growth approach using
compact tension specimens was used to quantify the crack growth resistance as a Junction of distance from the occlusal surface.
There were significant differences in the apparent toughness estimated using the two approaches, which was attributed to the
active crack length and corresponding scale of the toughening mechanisms. |
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