MECHANICAL CHARACTERISTICS FOR COBALT - CHROMIUM AND NICKEL - CHROMIUM CAST ALLOYS RECOVERY

Abstract

Since cobalt-chromium or nickel-chromium casting alloys became available for cast removable partial-denture restorations, their popularity have continued to increase. It was estimated that more than 80% of all partial-denture appliances were cast from cast from some type of these of base-metal alloy. According ANSI/ADA the specification of these dental restorative materials has to indicate the comply satisfactorily with requirements on toxicity, hypersensitivity, and corrosion of elemental composition, and the required minimum values for elongation, yield strength, and elastic modulus. The paper presents experimental considerations (experimental diagrams and values) concerning the possibility to recovery the cobalt-chromium and nickel-chromium alloys after the first casting.