Surface texture and hardness of dental alloys processed by alternative technologies

6th International Conference on Manufacturing Engineering and Process

工业技术;物理学

Porojan, Liliana^1 ; Savencu, Cristina E.^1 ; Topal, Florin I.^2 ; Porojan, Sorin D.^3

Department of Dental Prostheses Technology, Faculty of Dentistry, V. Babe University of Medicine and Pharmacy, 9 Revolutiei 1989 Blv., Timioara

300041, Romania^1

Department of Dental Prosthodontics, School of Dentistry, V. Babe University of Medicine and Pharmacy, 9 Revolutiei 1989 Blv., Timioara

300041, Romania^2

Department of Oral Rehabilitation, Faculty of Dentistry, V. Babe University of Medicine and Pharmacy, 9 Revolutiei 1989 Blv., Timioara

300041, Romania^3

关键词: Alternative technologies;    Experimental analysis;    Manufacturing methods;    Microstructural defects;    Prosthetic dentistries;    Selective laser melting;    Selective laser sintering;    Technological development;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/885/1/012004/pdf
DOI  :  10.1088/1742-6596/885/1/012004

学科分类：工业工程学

来源: IOP

【 摘 要 】

Technological developments have led to the implementation of novel digitalized manufacturing methods for the production of metallic structures in prosthetic dentistry. These technologies can be classified as based on subtractive manufacturing, assisted by computer-aided design/computer-aided manufacturing (CAD/CAM) systems, or on additive manufacturing (AM), such as the recently developed laser-based methods. The aim of the study was to assess the surface texture and hardness of metallic structures for dental restorations obtained by alternative technologies: conventional casting (CST), computerized milling (MIL), AM power bed fusion methods, respective selective laser melting (SLM) and selective laser sintering (SLS). For the experimental analyses metallic specimens made of Co-Cr dental alloys were prepared as indicated by the manufacturers. The specimen structure at the macro level was observed by an optical microscope and micro-hardness was measured in all substrates. Metallic frameworks obtained by AM are characterized by increased hardness, depending also on the surface processing. The formation of microstructural defects can be better controlled and avoided during SLM and MIL process. Application of power bed fusion techniques, like SLS and SLM, is currently a challenge in dental alloys processing.