Abstract
Dental alloys for direct metal laser sintering (DMLS) are available on the market today, but there is little scientific evidence reported on their characteristics. One of them is the release of ions, as an indicator of the corrosion characteristics of a dental alloy. Within this research, the difference in the elution of metals from DMLS and cast (CM) samples of Co-Cr-Mo dental alloy in saliva-like medium of three different pH was examined by inductively-coupled plasma mass spectrometry (ICP-MS). The obtained results show that the metal elution in artificial saliva from the DMLS alloy was lower than the elution from the CM alloy. The release of all investigated metal ions was influenced by the acidity, both from the DMLS and CM alloy, throughout the investigated period of 30 days. The change in acidity from a pH of 6.8 to a pH of 2.3 for the cast alloy led to a higher increase of the elution of Co, Cr and Mo from CM than from the DMLS alloy. The greatest release out of Co, Cr and Mo was for Co for both tested alloys. Further, the greatest release of all ions was measured at pH 2.3. In saliva of pH 2.3 and pH 4.5, the longer the investigated period, the higher the difference between the total metal ion release from the CM and DMLS alloys. Both alloys showed a safe level of elution according to the ISO definition in all investigated acidic environments.
Highlights
Cobalt-Chromium-Molybdenum (Co-Cr-Mo) alloy is widely used alloy for the fabrication of removable partial dentures (RPDs) and porcelain-fused-to-metal crowns in dentistry today
The results show that the release of Co, Cr and Mo from the Direct metal laser sintering (DMLS) alloy was lower than the release of ions from the CM alloy in artificial saliva of all investigated pH concentrations
The procedure and results of the investigation of ion release from Co-Cr-Mo dental alloys used by advanced DMLS technology and by conventional casting techniques were presented
Summary
Cobalt-Chromium-Molybdenum (Co-Cr-Mo) alloy is widely used alloy for the fabrication of removable partial dentures (RPDs) and porcelain-fused-to-metal crowns in dentistry today. It has increasingly replaced noble metal alloys, because of better mechanical properties and lower cost, non-precious metal alloys are more difficult to cast. Direct metal laser sintering (DMLS) is a promising technology that may enable the fabrication of dental devices, overcoming some of the imperfections of casting [3]. A high power laser is used to melt a powder feedstock to form fully-dense metallic parts [6]. Objects fabricated by DMLS are extremely dense, and the mechanical properties are comparable to, or better than, those of cast or machined parts
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