Effect of recasting of CoCrMoW dental alloy on its microstructure and corrosion resistance
Current Issues in Pharmacy and Medical Sciences Vol. 26, No. 4, Pages 425-429
Mariusz Walczak, Kazimierz Drozd
Lublin University of Technology, Department of Materials Engineering, Lublin, Poland
The procedure consisting in the recasting of previously cast alloy is frequently used in dental laboratories in order to reduce the cost of permanent partial dentures being produced. Such a procedure may result in changed chemical composition of newly produced alloy and may influence its microstructure and corrosion resistance. In this research, the dental alloy CoCrMoW with the trade name Remanium 2001 (Denaturum, Germany) was used. Three groups of dental alloys were prepared by mixing 50% brand new alloy with alloy remnants from previous castings. The first group used 100% brand new alloy and served as control one (R1). The second group (R2) consisted of equal amounts of brand new alloy and alloy remnants cast only once. The third group (R3) contained 50% brand new alloy and alloy cast twice. Microstructural analysis was performed as well as chemical composition and corrosion was investigated in artificial saliva environment. The following corrosion resistance has been demonstrated on the basis of electrochemical research for three cobalt alloys: R1>R3>R2. Furthermore, it has been demonstrated that new material should be used in casting, and if previously cast material is used, it should be mixed with new material in the ratio 50:50. The recasting procedure can be safely used in dentistry.
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recasting, cobalt alloy, durability of prosthetic devices, corrosion resistance