Bending Fibers of Hydroxyapatite for Ordered Parallel Architecture in Bovine Tooth Enamel

Yutaro Yukimasa; Mihiro Takasaki; Yuya Oaki; Hiroaki Imai

doi:10.1021/acsomega.9b00070

Bending Fibers of Hydroxyapatite for Ordered Parallel Architecture in Bovine Tooth Enamel

Yutaro Yukimasa, Mihiro Takasaki, Yuya Oaki, Hiroaki Imai

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

The nanometer-scale bending structure in the enamel-dentin interfacial region of bovine teeth was clarified using detailed electron micrographs. We found that enamel prisms of width 5-10 μm in the enamel are regarded as a bundle of nanometer-scale hydroxyapatite (HA) fibers of width 20-30 nm that are connected to the enamel-dentin interface. The radial arrangements of HA fibers elongated in the c-axis were formed on the dentin surface at the boundary. The orientation adjustment of the HA fibers was observed through stepwise bending with a gradual change of the c direction in the ordered parallel array of the enamel prisms. Our observation suggests that the crystallographic ordering in the enamel layer originates from the growth-induced orientation of HA crystals in the interfacial region.

Original language	English
Pages (from-to)	3739-3744
Number of pages	6
Journal	ACS Omega
Volume	4
Issue number	2
DOIs	https://doi.org/10.1021/acsomega.9b00070
Publication status	Published - 2019 Feb 20

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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10.1021/acsomega.9b00070

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title = "Bending Fibers of Hydroxyapatite for Ordered Parallel Architecture in Bovine Tooth Enamel",

abstract = "The nanometer-scale bending structure in the enamel-dentin interfacial region of bovine teeth was clarified using detailed electron micrographs. We found that enamel prisms of width 5-10 μm in the enamel are regarded as a bundle of nanometer-scale hydroxyapatite (HA) fibers of width 20-30 nm that are connected to the enamel-dentin interface. The radial arrangements of HA fibers elongated in the c-axis were formed on the dentin surface at the boundary. The orientation adjustment of the HA fibers was observed through stepwise bending with a gradual change of the c direction in the ordered parallel array of the enamel prisms. Our observation suggests that the crystallographic ordering in the enamel layer originates from the growth-induced orientation of HA crystals in the interfacial region.",

author = "Yutaro Yukimasa and Mihiro Takasaki and Yuya Oaki and Hiroaki Imai",

note = "Funding Information: Bovine teeth were supplied by Prof. Kunio Ishikawa and Dr Yuki Sugiura at Kyushu University. This work was partially supported by the Grant-in-Aid for Challenging Exploratory Research (15K14129) and Scientific Research (A) (16H02398) from Japan Society for the Promotion of Science. Funding Information: Bovine teeth were supplied by Prof. Kunio Ishikawa and Dr Yuki Sugiura at Kyushu University. This work was partially supported by the Grant-in-Aid for Challenging Exploratory Research (15K14129) and Scientific Research (A) (16H02398) from Japan Society for the Promotion of Science Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",

year = "2019",

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doi = "10.1021/acsomega.9b00070",

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AU - Oaki, Yuya

AU - Imai, Hiroaki

N1 - Funding Information: Bovine teeth were supplied by Prof. Kunio Ishikawa and Dr Yuki Sugiura at Kyushu University. This work was partially supported by the Grant-in-Aid for Challenging Exploratory Research (15K14129) and Scientific Research (A) (16H02398) from Japan Society for the Promotion of Science. Funding Information: Bovine teeth were supplied by Prof. Kunio Ishikawa and Dr Yuki Sugiura at Kyushu University. This work was partially supported by the Grant-in-Aid for Challenging Exploratory Research (15K14129) and Scientific Research (A) (16H02398) from Japan Society for the Promotion of Science Publisher Copyright: Copyright © 2019 American Chemical Society.

PY - 2019/2/20

Y1 - 2019/2/20

N2 - The nanometer-scale bending structure in the enamel-dentin interfacial region of bovine teeth was clarified using detailed electron micrographs. We found that enamel prisms of width 5-10 μm in the enamel are regarded as a bundle of nanometer-scale hydroxyapatite (HA) fibers of width 20-30 nm that are connected to the enamel-dentin interface. The radial arrangements of HA fibers elongated in the c-axis were formed on the dentin surface at the boundary. The orientation adjustment of the HA fibers was observed through stepwise bending with a gradual change of the c direction in the ordered parallel array of the enamel prisms. Our observation suggests that the crystallographic ordering in the enamel layer originates from the growth-induced orientation of HA crystals in the interfacial region.

AB - The nanometer-scale bending structure in the enamel-dentin interfacial region of bovine teeth was clarified using detailed electron micrographs. We found that enamel prisms of width 5-10 μm in the enamel are regarded as a bundle of nanometer-scale hydroxyapatite (HA) fibers of width 20-30 nm that are connected to the enamel-dentin interface. The radial arrangements of HA fibers elongated in the c-axis were formed on the dentin surface at the boundary. The orientation adjustment of the HA fibers was observed through stepwise bending with a gradual change of the c direction in the ordered parallel array of the enamel prisms. Our observation suggests that the crystallographic ordering in the enamel layer originates from the growth-induced orientation of HA crystals in the interfacial region.

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Bending Fibers of Hydroxyapatite for Ordered Parallel Architecture in Bovine Tooth Enamel

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