Properties of a gypsum-bonded magnesia investment using a K2SO4 solution for titanium casting.

Fazal Reza, Yukimichi Tamaki, Hidekazu Takahashi, Naohiko Iwasaki, Takashi Miyazaki

Journal: Dental materials journal 2009;28(3):301-6

PMID: 19662729

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

Abstract

The purpose of the study was to investigate the effects of a K2SO4 solution on the improvement of the properties of an experimental magnesia-based gypsum-bonded investment. The characteristics of the experimental investment with different ratios of a K2SO4 solution were as follows: setting time ranged from 34 to 152 minutes, green and fired compressive strengths were approximately 2.15 to 5.81 MPa and 1.63 to 2.45 MPa, respectively; thermal expansion was 0.38 to 0.47% at 700 degrees C, which did not show any significant differences due to the concentration of the K2SO4 solution. Titanium casting could be obtained using the experimental investment mixed with a 1% K2SO4 solution, and the reaction layer thickness of the casting was less than 200 microm. The results suggest that the experimental investment mixed with 1% K2SO4 showed acceptable physical properties and casting characteristics for titanium casting.

Address: Advanced Biomaterials, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. [email protected]

DOI: 10.4012/dmj.28.301

Link outs

Free resources

Full Text Sources:

http://joi.jlc.jst.go.jp/JST.JSTAGE/dmj/28.301?fro...

Subscription / membership required

Full Text Sources:

https://www.medicalonline.jp/meteo_linkout.php?iss...

MeSH Terms: Calcium Sulfate, Compressive Strength, Crystallography, Dental Casting Investment, Dental Casting Technique, Dental Materials, Hardness, Hot Temperature, Humans, Magnesium Oxide, Materials Testing, Stress, Mechanical, Sulfates, Surface Properties, Thermodynamics, Time Factors, Titanium, X-Ray Diffraction