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Orientation and deformation of mineral crystals in tooth surfaces

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Title: Orientation and deformation of mineral crystals in tooth surfaces
Authors: Fujisaki, Kazuhiro Browse this author
Todoh, Masahiro Browse this author
Niida, Atsushi Browse this author
Shibuya, Ryota Browse this author
Kitami, Shunsuke Browse this author
Tadano, Shigeru Browse this author →KAKEN DB
Keywords: Biomechanics
Tooth enamel
X-ray diffraction
Crystal orientation
Issue Date: Jun-2012
Publisher: Elsevier
Journal Title: Journal of the Mechanical Behavior of Biomedical Materials
Volume: 10
Start Page: 176
End Page: 182
Publisher DOI: 10.1016/j.jmbbm.2012.02.025
PMID: 22520429
Abstract: Tooth enamel is the hardest material in the human body, and it is mainly composed of hydroxyapatite (HAp)-like mineral particles. As HAp has a hexagonal crystal structure, X-ray diffraction methods can be used to analyze the crystal structure of HAp in teeth. Here, the X-ray diffraction method was applied to the surface of tooth enamel to measure the orientation and strain of the HAp crystals. The c-axis of the hexagonal crystal structure of HAp was oriented to the surface perpendicular to the tooth enamel covering the tooth surface. Thus, the strain of HAp at the surface of teeth was measured by X-ray diffraction from the (004) lattice planes aligned along the c-axis. The X-ray strain measurements were conducted on tooth specimens with intact surfaces under loading. Highly accurate strain measurements of the surface of tooth specimens were performed by precise positioning of the X-ray irradiation area during loading. The strains of the (004) lattice plane were measured at several positions on the surface of the specimens under compression along the tooth axis. The strains were obtained as tensile strains at the labial side of incisor tooth specimens. In posterior teeth, the strains were different at different measurement positions, varying from tensile to compressive types.
Rights: Copyright Elsevier
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 但野 茂

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