title: Properties of experimental titanium cast investment mixing with water reducing agent solution.
abstract: This study aimed to develop a dental investment for titanium casting. ZrO(2) and Al(2)O(3) were selected as refractory materials to prepare three investments (Codes: A-C) according to the quantity of Zr. Al(2)O(3) cement was used as a binder at a ratio of 15%, they were mixed with special mixing liquid. B1 was used as a control mixed with water. Fundamental examinations were statistically evaluated. A casting test was performed with investment B. Fluidities, setting times, and green strengths showed no remarkable differences; however, they were significantly different from those of B1. Expansion values for A, B, C, and B1 at 850°C were 1.03%±0.08%, 1.96%±0.17%, 4.35%±0.23%, and 1.50%±0.28%, respectively. Castings were covered by only small amounts of mold materials. The hardness test showed no significant differences between castings from B and the ones from commercial investments. The experimental special mixing liquid effectively reduced the water/powder ratio and improved the strength and thermal expansion.
authors.affiliation: Capital Medical University, School of Stomatology, Beijing Institute of Dental Research, 4 Tian Tan Xi Li, Dongcheng District, Beijing, P R China. showazhang@hotmail.com
authors.forename: Zutai
authors.initials: Z
authors.lastname: Zhang
authors.forename: Ning
authors.initials: N
authors.lastname: Ding
authors.forename: Yukimichi
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Hotta
authors.forename: Cho
authors.initials: C
authors.lastname: Han-Cheol
authors.forename: Takashi
authors.initials: T
authors.lastname: Miyazaki
mesh_terms: D000537:Aluminum Oxide / Q000737:chemistry; D019245:Compressive Strength; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique; D003764:Dental Materials / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D006801:Humans; D016651:Lithium Carbonate / Q000737:chemistry; D008422:Materials Testing; D011208:Powders; D012212:Rheology; D013314:Stress, Mechanical; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014867:Water / Q000737:chemistry; D015040:Zirconium / Q000737:chemistry
chemical_list: D003734:Dental Casting Investment; D003764:Dental Materials; D011208:Powders; D014867:Water; D016651:Lithium Carbonate; D015040:Zirconium; D014025:Titanium; D000537:Aluminum Oxide; C028541:zirconium oxide