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Two-Body Wear of CoCr Fabricated by Selective Laser Melting Compared with Different Dental Alloys

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Abstract

The purpose of this study was to assess the two-body wear of cobalt–chromium (CoCr) samples fabricated by selective laser melting (SLM) in contrast to cast samples and enamel. The following materials were chosen for comparison with SLM-CoCr: a CoCr alloy for use in the lost-wax technique, four gold alloys with different hardness, titanium (grade 1), and human enamel. Seven specimens of diameter 12 mm and thickness 1 mm were produced from each material and polished with emery paper. Al2O3 ceramic balls served as antagonists in the biaxial chewing simulator. Multiple chewing cycles were applied with a static load of 50 N. Wear was analysed laser-optically by the use of cast replicas. Statistical analyses were performed with Kruskal–Wallis test and subsequent post hoc Mann–Whitney U tests at a significance level of 0.05. SLM-CoCr showed less wear than any of the other materials. The difference was statistically significant between SLM-CoCr (vertical loss −54.4 ± 6.9 µm after 300,000 cycles) and cast CoCr (vertical loss −117.2 ± 18.6 µm after 300,000 cycles). Greatest vertical wear was observed for titanium. SLM-CoCr exhibits a great resistance to wear and might represent an alternative for the manufacture of prosthetic restorations even in occlusal loading areas.

Clinical relevance Clinical investigations on wear of SLM-CoCr are needed to assess its in vivo behaviour.

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Acknowledgments

The authors are thankful to Herbert Gilde for initiating and realizing parts of the investigation. The authors would like to thank Clemens Schmitt, for helping with the laser scanning and performing the SEM images, and Ian Davies, for proofreading the manuscript. This research was made possible by Degudent GmbH by providing the SLM samples.

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Authors and Affiliations

  1. Department of Prosthodontics, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany

    Franz Sebastian Schwindling, Stefan Rues, Marc Schmitter & Thomas Stober

  2. Private Practice, Bruchsal, Germany

    Maren Seubert

  3. Private Practice, Heidelberg, Germany

    Ulrich Koke

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  1. Franz Sebastian Schwindling
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Correspondence to Franz Sebastian Schwindling.

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Schwindling, F.S., Seubert, M., Rues, S. et al. Two-Body Wear of CoCr Fabricated by Selective Laser Melting Compared with Different Dental Alloys. Tribol Lett 60, 25 (2015). https://doi.org/10.1007/s11249-015-0601-7

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