Dental Casting of Superelastic Ni-Ti Alloy

Rods of Ni-43.5wt% Ti alloy were prepared under various casting conditions. Specimens which were melted in a cordierite crucible and cast in a phosphate-bonded investment mold had less strength and elongation than those melted in a copper crucible and cast in a phosphate-bonded investment mold. All castings exhibited superelasticity at room temperature. The upper limit of recoverable strain was about 1.8%. The cast clasps made of the alloy had good fit to a die, good flexibility, and superelasticity.