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Hydration-induced nano- to micro-scale self-recovery of the tooth enamel of the giant panda
Liu, Zengqian1,2; Weng, Zhaoyong1; Zhai, Zhao-Feng1; Huang, Nan1; Zhang, Zhen-Jun1; Tan, Jun1; Jiang, Chuanbin1; Jiao, Da1; Tan, Guoqi1,3; Zhang, Jian1,4; Jiang, Xin1; Zhang, Zhefeng1; Ritchie, Robert O.2
Corresponding AuthorZhang, Zhefeng(zhfzhang@imr.ac.cn) ; Ritchie, Robert O.(roritchie@lbl.gov)
2018-11-01
Source PublicationACTA BIOMATERIALIA
ISSN1742-7061
Volume81Pages:267-277
AbstractThe tooth enamel of vertebrates comprises a hyper-mineralized bioceramic, but is distinguished by an exceptional durability to resist impact and wear throughout the lifetime of organisms; however, enamels exhibit a low resistance to the initiation of large-scale cracks comparable to that of geological minerals based on fracture mechanics. Here we reveal that the tooth enamel, specifically from the giant panda, is capable of developing durability through counteracting the early stage of damage by partially recovering its innate geometry and structure at nano- to micro- length-scales autonomously. Such an attribute results essentially from the unique architecture of tooth enamel, specifically the vertical alignment of nano-scale mineral fibers and micro-scale prisms within a water-responsive organic-rich matrix, and can lead to a decrease in the dimension of indent damage in enamel introduced by indentation. Hydration plays an effective role in promoting the recovery process and improving the indentation fracture toughness of enamel (by similar to 73%), at a minor cost of micro-hardness (by similar to 5%), as compared to the dehydrated state. The nano-scale mechanisms that are responsible for the recovery deformation, specifically the reorientation and rearrangement of mineral fragments and the inter- and intra-prismatic sliding between constituents that are closely related to the viscoelasticity of organic matrix, are examined and analyzed with respect to the structure of tooth enamel. Our study sheds new light on the strategies underlying Nature's design of durable ceramics which could be translated into man-made systems in developing high-performance ceramic materials. Statement of Significance Tooth enamel plays a critical role in the function of teeth by providing a hard surface layer to resist wear/impact throughout the lifetime of organisms; however, such enamel exhibits a remarkably low resistance to the initiation of large-scale cracks, of hundreds of micrometers or more, comparable to that of geological minerals. Here we reveal that tooth enamel, specifically that of the giant panda, is capable of partially recovering its geometry and structure to counteract the early stages of damage at nano- to micro-scale dimensions autonomously. Such an attribute results essentially from the architecture of enamel but is markedly enhanced by hydration. Our work discerns a series of mechanisms that lead to the deformation and recovery of enamel and identifies a unique source of durability in the enamel to accomplish this function. The ingenious design of tooth enamel may inspire the development of new durable ceramic materials in man-made systems. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordTooth enamel Self-recovery Durability Hydration Bioinspiration
Funding OrganizationNational Natural Science Foundation of China ; Multi-University Research Initiative ; Air Force Office of Scientific Research
DOI10.1016/j.actbio.2018.09.053
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51871216] ; National Natural Science Foundation of China[51331007] ; Multi-University Research Initiative[AFOSR-FA9550-15-1-0009] ; Air Force Office of Scientific Research
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Biomedical ; Materials Science, Biomaterials
WOS IDWOS:000451937500021
PublisherELSEVIER SCI LTD
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/130525
Collection中国科学院金属研究所
Corresponding AuthorZhang, Zhefeng; Ritchie, Robert O.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China
2.Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA
3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
4.Lanzhou Univ Technol, State Key Lab Adv Nonferrous Mat, Lanzhou 730050, Gansu, Peoples R China
Recommended Citation
GB/T 7714
Liu, Zengqian,Weng, Zhaoyong,Zhai, Zhao-Feng,et al. Hydration-induced nano- to micro-scale self-recovery of the tooth enamel of the giant panda[J]. ACTA BIOMATERIALIA,2018,81:267-277.
APA Liu, Zengqian.,Weng, Zhaoyong.,Zhai, Zhao-Feng.,Huang, Nan.,Zhang, Zhen-Jun.,...&Ritchie, Robert O..(2018).Hydration-induced nano- to micro-scale self-recovery of the tooth enamel of the giant panda.ACTA BIOMATERIALIA,81,267-277.
MLA Liu, Zengqian,et al."Hydration-induced nano- to micro-scale self-recovery of the tooth enamel of the giant panda".ACTA BIOMATERIALIA 81(2018):267-277.
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