CoCrMo-base alloys for dental applications obtained by selective laser melting (slm) and cad/cam milling

• Autor(a) principal: dos Santos, Claudinei
• Data de Publicação: 2020
• Outros Autores: Habibe, Alexandre Fernandes, Simba, Bruno Galvão [UNESP], Lins, Jefferson Fabrício Cardoso, de Freitas, Bruno Xavier, Nunes, Carlos Angelo
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1590/1980-5373-MR-2019-0599; http://hdl.handle.net/11449/199316
• topic: Additive manufacturing; CAD/CAM milling; CoCrMo metal system; Dental alloys; Mechanical properties; Microstructural characterization; Selective laser melting

In this work, CoCrMo-base alloys specimens were produced by additive manufacturing using selective laser melting (SLM) as well as CAD/CAM milling. For SLM specimens, spherical particles were laser processed at 1320°C under argon atmosphere and submitted to thermal stress relieving at 750°C-45min. Specimens from CoCrMo blocks were milled by CAD/CAM machining and sintered at 1300°C-60min. The materials from both techniques were characterized by relative density, dilatometry, SEM/BSE, OM and XRD analysis. The mechanical properties were determined by Vickers hardness and tensile tests. The specimens from both techniques exhibited single phase γCo (FCC) and CTE of 14 x10-6 °C-1. Relative density of 95.4%/ 85.6%, hardness values near 400HV/ 350HV and UTS of 905MPa/ 780MPa were measured for SLM and CAD/CAM specimens, respectively. Higher relative density is the main factor for increased mechanical properties of SLM specimens. On the other hand, both SLM and CAD/CAM specimens present properties in accordance with ISO-22674 recommendations, compatible with dental applications such as bridges containing four or more elements as well as fully dense pontics.