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Materials 2014, 7(9), 6486-6501; doi:10.3390/ma7096486

A Comparative Analysis of the Corrosive Effect of Artificial Saliva of Variable pH on DMLS and Cast Co-Cr-Mo Dental Alloy

1
Department of Dentistry, Medical Faculty, University of Novi Sad, Hajduk Veljkova 3, 21000 Novi Sad, Serbia
2
Clinic for Prosthodontics, School of Dentistry, University Business Academy, Zarka Zrenjanina 179, 13000 Pancevo, Serbia
3
Centre for Dental Technology, Cardiff Metropolitan University, PDR UWIC Western Avenue, Cardiff CF5 2YB, UK
4
National Centre for Product Design and Development Research, Cardiff Metropolitan University, PDR UWIC Western Avenue, Cardiff CF5 2YB, UK
5
Department of Production Engineering, Faculty of Technical Sciences, University of Novi Sad, Trg Dositeja Obradovica 6, 21000 Novi Sad, Serbia
*
Author to whom correspondence should be addressed.
Received: 16 May 2014 / Revised: 26 August 2014 / Accepted: 1 September 2014 / Published: 11 September 2014
(This article belongs to the Section Biomaterials)
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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. View Full-Text
Keywords: dental alloys; corrosion resistance; direct metal laser sintering (DMLS); Co-Cr-Mo alloy dental alloys; corrosion resistance; direct metal laser sintering (DMLS); Co-Cr-Mo alloy
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Puskar, T.; Jevremovic, D.; Williams, R.J.; Eggbeer, D.; Vukelic, D.; Budak, I. A Comparative Analysis of the Corrosive Effect of Artificial Saliva of Variable pH on DMLS and Cast Co-Cr-Mo Dental Alloy. Materials 2014, 7, 6486-6501.

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