Effects of recasting on the chemical composition, microstructure, microhardness, and ion release of 3 dental casting alloys and titanium.
This study evaluated the effects of recasting on high noble, noble, and nickel-based alloys, as well as on titanium. Four specimens of each material were cast and recast 7 times. Chemical composition, microstructure, microhardness, and ion release were determined before and after the first cast and following each recast. Zinc and tin concentrations in the high noble alloy decreased significantly with recasting; consequently, the release of these ions decreased as well. A significant increase in Vickers hardness appeared in the fifth recast in both the high noble alloy and titanium. The noble alloy and the nickel-based alloy demonstrated great stability after 7 recasts. The results suggest not recasting titanium.
Peraire
Maria
M
Department of Prosthodontics, Faculty of Dentistry, Universitat de Barcelona, Spain.
Martinez-Gomis
Jordi
J
Anglada
Josep M
JM
Bizar
Josep
J
Salsench
Juan
J
Gil
Francesc J
FJ
D000704:Analysis of Variance; D002858:Chromium Alloys / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry; D003735:Dental Casting Technique; D017743:Equipment Reuse; D006047:Gold Alloys / Q000737:chemistry; D006244:Hardness; D007477:Ions / Q000032:analysis; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry; D014001:Tin / Q000032:analysis; D014025:Titanium / Q000737:chemistry; D015032:Zinc / Q000032:analysis
D002858:Chromium Alloys; D003722:Dental Alloys; D006047:Gold Alloys; D007477:Ions; D014001:Tin; D009532:Nickel; D014025:Titanium; D015032:Zinc