title: Properties of a gypsum-bonded magnesia investment using a K2SO4 solution for titanium casting.
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.
authors: 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. reza.abm@tmd.ac.jp
authors: Fazal
authors: F
authors: Reza
authors: Yukimichi
authors: Y
authors: Tamaki
authors: Hidekazu
authors: H
authors: Takahashi
authors: Naohiko
authors: N
authors: Iwasaki
authors: Takashi
authors: T
authors: Miyazaki
mesh_terms: D002133:Calcium Sulfate / Q000737:chemistry*; D019245:Compressive Strength; D003461:Crystallography; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique; D003764:Dental Materials / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D006801:Humans; D008277:Magnesium Oxide / Q000737:chemistry*; D008422:Materials Testing; D013314:Stress, Mechanical; D013431:Sulfates / Q000737:chemistry*; D013499:Surface Properties; D013816:Thermodynamics; D013997:Time Factors; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D003734:Dental Casting Investment; D003764:Dental Materials; D013431:Sulfates; C031512:potassium sulfate; D008277:Magnesium Oxide; D014025:Titanium; D002133:Calcium Sulfate