期刊
SCIENCE
卷 347, 期 6223, 页码 746-750出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1258950
关键词
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资金
- National Science Foundation [NSF DMR-0805313, DMR-1106208, DMR-1341391]
- Northwestern University Materials Research Center [NSF-Materials Research and Engineering Center (MRSEC)] [DMR-1121262]
- International Institute for Nanotechnology
- Institute for Sustainability and Energy at Northwestern (ISEN)
- ACS
- Canadian National Sciences and Engineering Research Council
- NIH [T32GM008449]
- U.S. DOE [DE-AC02-06CH11357]
- E. I. DuPont de Nemours Co.
- Dow Chemical Company
- Northwestern University
- Natural Sciences and Engineering Research Council of Canada
- National Research Council of Canada
- Canadian Institutes of Health Research
- Province of Saskatchewan
- Western Economic Diversification Canada
- University of Saskatchewan
- NSF-MRI [DMR-0420532]
- ONR-DURIP [N00014-0400798, N00014-0610539, N00014-0910781]
- NSF-MRSEC [DMR-1121262]
- NASA Ames Research Center [NNA06CB93G]
- NSF-NSEC [EEC-0118025/003]
- Keck Foundation
- State of Illinois
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1106208] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1341391] Funding Source: National Science Foundation
Dental enamel, a hierarchical material composed primarily of hydroxylapatite nanowires, is susceptible to degradation by plaque biofilm-derived acids. The solubility of enamel strongly depends on the presence of Mg2+, F-, and CO32-. However, determining the distribution of these minor ions is challenging. We show-using atom probe tomography, x-ray absorption spectroscopy, and correlative techniques-that in unpigmented rodent enamel, Mg2+ is predominantly present at grain boundaries as an intergranular phase of Mg-substituted amorphous calcium phosphate (Mg-ACP). In the pigmented enamel, a mixture of ferrihydrite and amorphous iron-calcium phosphate replaces the more soluble Mg-ACP, rendering it both harder and more resistant to acid attack. These results demonstrate the presence of enduring amorphous phases with a dramatic influence on the physical and chemical properties of the mature mineralized tissue.
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