Journal
ACTA BIOMATERIALIA
Volume 9, Issue 2, Pages 5273-5279Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.actbio.2012.08.034
Keywords
Bio-inspired design; Functionally graded multilayers; Finite element method; Slow crack growth
Funding
- National Institute of Health [P01DE10956]
- National Science Foundation [0231418]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0231418] Funding Source: National Science Foundation
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The ceramic crown structures under occlusal contact are idealized as flat multilayered structures that are deformed under Hertzian contact loading. Those multilayers consist of a crown-like ceramic top layer, an adhesive layer and the dentin-like substrate. Bio-inspired design of the adhesive layer proposed functionally graded multilayers (FGM) that mimic the dentin-enamel junction in natural teeth. This paper examines the effects of FGM layer architecture on the contact-induced deformation of bin-inspired dental multilayers. Finite element modeling was used to explore the effects of thickness and architecture on the contact-induced stresses that are induced in bio-inspired dental multilayers. A layered nanocomposite structure was then fabricated by the sequential rolling of micro-scale nanocomposite materials with local moduli that increase from the side near the soft dentin-like polymer composite foundation to the side near the top ceramic layer. The loading rate dependence of the critical failure loads is shown to be well predicted by a slow crack growth model, which integrates the actual mechanical properties that are obtained from nanoindentation experiments. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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