title: Effect of casting methods on castability of pure titanium.
abstract: Two types of patterns were tested for castability: 1) polyester mesh pattern (20mm x 22mm with 100 open squares) and 2) 20mm x 20mm wax plates 1.0 and 1.5 mm in thickness. These materials were invested using a pre-arranged commercial phosphate-bonded investment for titanium. Three different types of casting machines were selected: 1) a pressure-type casting machine with separate melting and casting chambers, 2) a pressure-type casting machine with one chamber and 3) a centrifugal-type casting machine at 3000 rpm. Pure titanium (> 99.5%) was cast into the molds at a mold temperature of 100 degrees C. The castability of mesh pattern was evaluated in terms of the number of cast segment, and the cast plate was evaluated using X-ray transparent images by a digital imaging technique. The centrifugal casting method showed the best castability among these three casting methods.
authors.affiliation: Department of Dental Technology, Osaka University Faculty of Dentistry, Japan.
authors.forename: J
authors.initials: J
authors.lastname: Takahashi
authors.forename: J Z
authors.initials: JZ
authors.lastname: Zhang
authors.forename: M
authors.initials: M
authors.lastname: Okazaki
mesh_terms: D003735:Dental Casting Technique / Q000295:instrumentation; D016062:Porosity; D014025:Titanium / Q000737:chemistry*; D014783:Viscosity
chemical_list: D014025:Titanium