Effect of casting atmosphere on the quality of Ti-crowns.
Ti has a strong affinity to elements like O, N, and C. During melting a non-reacting crucible and vacuum and/or Ar-gas protection therefore have to be used. If the impurity content becomes too high, the material turns hard and brittle. In the present work vacuum/Ar-pressure casting of crowns has been carried out at different air pressure levels. Recording of hardness on cross-sections of the castings and the degree of mold filling show that an air pressure level less than 1 torr in the melting chamber and less than 10 torr in the mold chamber is sufficient to obtain sound castings of a small size like a crown.
NIOM, Scandinavian Institute of Dental Materials, Haslum, Norway.
P A
PA
Sunnerkrantz
M
M
Syverud
H
H
Herö
D001128:Argon; D001274:Atmospheric Pressure; D003442:Crowns; D003735:Dental Casting Technique / Q000295:instrumentation / Q000592:standards; D006244:Hardness; D008855:Microscopy, Electron, Scanning; D011786:Quality Control; D014025:Titanium; D014618:Vacuum
D001128:Argon; D014025:Titanium