title: Space-cutting model of hydroxyapatite.
abstract: The possibility of substitution of trace elements such as Mg2+, Sr2+ and Ba2+ into the columnar Ca2+ positions of hydroxyapatite was examined by computer graphics with a personal computer and a space-cutting method. Data on the structural coordinates of the hydroxyapatite were put into a protein graphics program in Angstrom units. The connection of each element, with front and rear, was displayed by the shade-line erasing method, and the solidity of the image was expressed by the degree of lightness from the light source. The space-cutting model was obtained by selecting the cutting plane with three atoms in the crystal. Rotating the graphics freely around the X, Y and Z axes gives a view from any direction. The computer graphics suggested visually how the lattice dimensions expand with Sr2+ and Ba2+ substitution and contract with Mg2+ substitution.
authors.affiliation: Department of Dental Technology, Osaka University Faculty of Dentistry, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Okazaki
authors.forename: M
authors.initials: M
authors.lastname: Sato
authors.forename: J
authors.initials: J
authors.lastname: Takahashi
mesh_terms: D000465:Algorithms; D001464:Barium / Q000737:chemistry; D002118:Calcium / Q000737:chemistry*; D002413:Cations, Divalent; D003196:Computer Graphics; D003198:Computer Simulation; D017886:Durapatite / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D008956:Models, Chemical; D011506:Proteins / Q000737:chemistry / Q000648:ultrastructure; D013324:Strontium / Q000737:chemistry
chemical_list: D002413:Cations, Divalent; D008670:Metals; D011506:Proteins; D001464:Barium; D017886:Durapatite; D008274:Magnesium; D002118:Calcium; D013324:Strontium