title: Dimensional accuracy and surface property of titanium casting using gypsum-bonded alumina investment.
abstract: The aim of the present study was to evaluate the dimensional accuracy and surface property of titanium casting obtained using a gypsum-bonded alumina investment. The experimental gypsum-bonded alumina investment with 20 mass% gypsum content mixed with 2 mass% potassium sulfate was used for five cp titanium castings and three Cu-Zn alloy castings. The accuracy, surface roughness (Ra), and reaction layer thickness of these castings were investigated. The accuracy of the castings obtained from the experimental investment ranged from -0.04 to 0.23%, while surface roughness (Ra) ranged from 7.6 to 10.3microm. A reaction layer of about 150 microm thickness under the titanium casting surface was observed. These results suggested that the titanium casting obtained using the experimental investment was acceptable. Although the reaction layer was thin, surface roughness should be improved.
authors.affiliation: Institute of Oral Materials Science, Chung Shan Medical University, 110, Sec. 1 Chien-Kuo N. Road, Taichung 402, Taiwan. yan@csmu.edu.tw
authors.forename: Min
authors.initials: M
authors.lastname: Yan
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Takahashi
authors.forename: Fumio
authors.initials: F
authors.lastname: Nishimura
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry*; D000704:Analysis of Variance; D002133:Calcium Sulfate / Q000737:chemistry*; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique; D006244:Hardness; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014025:Titanium
chemical_list: D003734:Dental Casting Investment; D014025:Titanium; D000537:Aluminum Oxide; D002133:Calcium Sulfate