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Materials 2016, 9(7), 596; doi:10.3390/ma9070596

Microstructures and Mechanical Properties of Co-Cr Dental Alloys Fabricated by Three CAD/CAM-Based Processing Techniques

1
Department of Dental Science, Graduate School, Kyungpook National University, Daegu 700-412, Korea
2
Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu 700-412, Korea
3
Korea Textile Development Institute, Daegu 703-712, Korea
4
Center for Research Facilities, Yeungnam University, Gyeongsan 712-749, Korea
5
Department of Dental Biomaterials, School of Dentistry, Kyungpook National University, Daegu 700-412, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Andrew J. Ruys
Received: 25 June 2016 / Revised: 12 July 2016 / Accepted: 15 July 2016 / Published: 20 July 2016
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Abstract

The microstructures and mechanical properties of cobalt-chromium (Co-Cr) alloys produced by three CAD/CAM-based processing techniques were investigated in comparison with those produced by the traditional casting technique. Four groups of disc- (microstructures) or dumbbell- (mechanical properties) specimens made of Co-Cr alloys were prepared using casting (CS), milling (ML), selective laser melting (SLM), and milling/post-sintering (ML/PS). For each technique, the corresponding commercial alloy material was used. The microstructures of the specimens were evaluated via X-ray diffractometry, optical and scanning electron microscopy with energy-dispersive X-ray spectroscopy, and electron backscattered diffraction pattern analysis. The mechanical properties were evaluated using a tensile test according to ISO 22674 (n = 6). The microstructure of the alloys was strongly influenced by the manufacturing processes. Overall, the SLM group showed superior mechanical properties, the ML/PS group being nearly comparable. The mechanical properties of the ML group were inferior to those of the CS group. The microstructures and mechanical properties of Co-Cr alloys were greatly dependent on the manufacturing technique as well as the chemical composition. The SLM and ML/PS techniques may be considered promising alternatives to the Co-Cr alloy casting process. View Full-Text
Keywords: Co-Cr alloy; fabrication techniques; CAD/CAM; microstructure; mechanical properties Co-Cr alloy; fabrication techniques; CAD/CAM; microstructure; mechanical properties
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kim, H.R.; Jang, S.-H.; Kim, Y.K.; Son, J.S.; Min, B.K.; Kim, K.-H.; Kwon, T.-Y. Microstructures and Mechanical Properties of Co-Cr Dental Alloys Fabricated by Three CAD/CAM-Based Processing Techniques. Materials 2016, 9, 596.

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