TITLE

Evaluation of different bonded investments for dental titanium casting

AUTHOR(S)
Hsu, H. C.; Kikuchi, H.; Yen, S. K.; Nishiyama, M.
PUB. DATE
April 2007
SOURCE
Journal of Materials Science: Materials in Medicine;Apr2007, Vol. 18 Issue 4, p605
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The properties of several different investments were investigated including phosphate bonded, magnesia bonded, and alumina cement investments. Measurements included the setting expansion, thermal expansion, and compressive strength of investments, as well as the tensile strength, elongation, Vickers hardness (VHN) and surface roughness of titanium castings. For phosphate bonded investment, the setting expansion after being mixed with its own mixing solution was 2.10%, which was larger than the other investments; the thermal expansion was −0.25% at 200°C, the compressive strength 14 and 5 MPa after heating. For titanium cast in phosphate bonded investment, the hardness on its top surface was 655 Hv, the tensile strength was 379 MPa, the elongation was 19.4%, and the surface roughness was 2.29 μm. Athough the thermal expansion of phosphate bonded investment is small, the setting expansion is large enough to compensate for the shrinkage of titanium castings. As its thermal expansion at T ≥ 600°C was constant and its heating-cooling cycle was almost reversible, these two properties can reduce the thermal shock and thus avoid cracking of the investment.
ACCESSION #
25277558

 

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