title: Bio-inspired dental multilayers: effects of layer architecture on the contact-induced deformation.
abstract: 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 bio-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.
authors.affiliation: Department of Mechanical and Aerospace Engineering, Engineering Quadrangle Room D404B, Princeton University, Princeton, NJ 08544, USA.
authors.forename: J
authors.initials: J
authors.lastname: Du
authors.forename: X
authors.initials: X
authors.lastname: Niu
authors.forename: N
authors.initials: N
authors.lastname: Rahbar
authors.forename: W
authors.initials: W
authors.lastname: Soboyejo
mesh_terms: D001672:Biocompatible Materials / Q000494:pharmacology*; D003764:Dental Materials / Q000494:pharmacology*; D003776:Dental Porcelain / Q000494:pharmacology; D055119:Elastic Modulus / Q000187:drug effects; D006801:Humans; D008422:Materials Testing; D036103:Nanotechnology; D061848:Optical Imaging; D013314:Stress, Mechanical; D014070:Tooth / Q000187:drug effects*
chemical_list: D001672:Biocompatible Materials; D003764:Dental Materials; D003776:Dental Porcelain