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

Materials

Bong Ki Min¹  Young Kyung Kim²  Kyo-Han Kim³  Tae-Yub Kwon³  Hae Ri Kim⁴  Seong-Ho Jang⁴  Jun Sik Son⁵ 

[1] Center for Research Facilities, Yeungnam University, Gyeongsan 712-749, Korea;Department of Conservative Dentistry, School of Dentistry, Kyungpook National University, Daegu 700-412, Korea;Department of Dental Biomaterials, School of Dentistry, Kyungpook National University, Daegu 700-412, Korea;Department of Dental Science, Graduate School, Kyungpook National University, Daegu 700-412, Korea;Korea Textile Development Institute, Daegu 703-712, Korea;

关键词: Co-Cr alloy;    fabrication techniques;    CAD/CAM;    microstructure;    mechanical properties;   

DOI  :  10.3390/ma9070596

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown