title: The thickness effects of titanium castings on the surface reaction layer.
abstract: In this study, wedge-shaped CP titanium castings and Ti-6Al-7Nb alloy castings were produced by three types of investment. The effects of the castings' thickness on surface reaction layer were investigated by measuring Vickers hardness, observing the microstructure, and analyzing the oxygen concentration. It was found that the thickness of the surface reaction layer was affected by the thickness of the wedge-shaped castings, and that the hardness value near the surface became lower toward the tip of the wedge-shaped CP titanium and Ti-6Al-7Nb alloy castings. The surface reaction layer of the Ti-6Al-7Nb alloy castings was thinner than that of the CP titanium castings.
authors.affiliation: Department of Dental Materials, Nihon University School of Dentistry, Tokyo, Japan. kikuchi-h@dent.nihon-u.ac.jp
authors.forename: Hisaji
authors.initials: H
authors.lastname: Kikuchi
authors.forename: Makoto
authors.initials: M
authors.lastname: Onouchi
authors.forename: Kohichi
authors.initials: K
authors.lastname: Miyanaga
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Wakashima
authors.forename: Osamu
authors.initials: O
authors.lastname: Okuno
authors.forename: Minoru
authors.initials: M
authors.lastname: Nishiyama
mesh_terms: D003722:Dental Alloys / Q000737:chemistry*; D003734:Dental Casting Investment; D003735:Dental Casting Technique; D006244:Hardness; D008422:Materials Testing; D010100:Oxygen / Q000032:analysis; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*
chemical_list: D003722:Dental Alloys; D003734:Dental Casting Investment; C070282:Ti-6Al-7Nb alloy; D014025:Titanium; D010100:Oxygen