Bio-inspired design of dental multilayers: Experiments and model |
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| Authors: | Xinrui Niu Nima Rahbar Stephen Farias Wole Soboyejo |
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| Institution: | 1. Princeton Institute for the Science and Technology of Materials (PRISM), Princeton University, Princeton, NJ 08544, United States;2. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, United States;3. Department of Civil and Environmental Engineering, University of Massachusetts Dartmouth, North Dartmouth, MA 02747, United States;4. Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, MD 21218, United States;1. Scientific Research Department, Air Force Early Warning Academy, Wuhan 430019, China;2. Department of Mathematics and Information Sciences, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China;3. Department of Electronic Science, Huizhou University, Guangdong 516001, China;1. Multidisciplinary Pain Center, Uppsala University Hospital, Sweden;2. Clinics of Anesthesiology and Intensive Care Medicine, Mannheim, University of Heidelberg, Germany;3. Department of Surgical Sciences, Uppsala University, Sweden;1. Department of Restorative Dentistry and Endodontology, Kagoshima University Graduate School of Medical and Dental Sciences, Sakuragaoka, Kagoshima, Japan;2. Department of Mechanical Engineering, Graduate School of Science and Engineering, Kagoshima University, Korimoto, Kagoshima, Japan;1. Department of Mechanical Engineering, Hakim Sabzevari University, Sabzevar, Iran;2. Department of Mechanical Engineering, TOBB University of Economics and Technology, Ankara, 06560, Turkey |
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| Abstract: | This paper combines experiments, simulations and analytical modeling that are inspired by the stress reductions associated with the functionally graded structures of the dentin–enamel-junctions (DEJs) in natural teeth. Unlike conventional crown structures in which ceramic crowns are bonded to the bottom layer with an adhesive layer, real teeth do not have a distinct “adhesive layer” between the enamel and the dentin layers. Instead, there is a graded transition from enamel to dentin within a  10 to 100 μm thick regime that is called the Dentin Enamel Junction (DEJ). In this paper, a micro-scale, bio-inspired functionally graded structure is used to bond the top ceramic layer (zirconia) to a dentin-like ceramic-filled polymer substrate. The bio-inspired functionally graded material (FGM) is shown to exhibit higher critical loads over a wide range of loading rates. The measured critical loads are predicted using a rate dependent slow crack growth (RDEASCG) model. The implications of the results are then discussed for the design of bio-inspired dental multilayers. |
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