Properties of experimental titanium cast investment mixing with water reducing agent solution.

Zutai Zhang, Ning Ding, Yukimichi Tamaki, Yasuhiro Hotta, Cho Han-Cheol, Takashi Miyazaki

Journal: Dental materials journal 2013;31(5):724-8

PMID: 23037833

Free Full Text on J-STAGE, Japan Science and Technology Information Aggregator, Electronic View on PubMed

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.

Address: Capital Medical University, School of Stomatology, Beijing Institute of Dental Research, 4 Tian Tan Xi Li, Dongcheng District, Beijing, P R China. [email protected]

DOI: 10.4012/dmj.2012-030

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MeSH Terms: Aluminum Oxide, Compressive Strength, Dental Casting Investment, Dental Casting Technique, Dental Materials, Hardness, Hot Temperature, Humans, Lithium Carbonate, Materials Testing, Powders, Rheology, Stress, Mechanical, Surface Properties, Thermodynamics, Time Factors, Titanium, Water, Zirconium