New Approaches in Computer Aided Printing Technologies

Önöral, Özay

doi:10.7126/cumudj.298920

Cited by 4 publications

(5 citation statements)

References 31 publications

(94 reference statements)

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“…As the light beam draws the object on the surface of the liquid, each time a layer of resin is polymerized or cross-linked until the real object is obtained [8,9,12,14,16]. The FDM characterizes with extruding the thermoplastic materials through heated nozzle, or the material is fed from a reservoir through a syringe [9,12,16].…”

Section: Introductionmentioning

confidence: 99%

“…The FDM characterizes with extruding the thermoplastic materials through heated nozzle, or the material is fed from a reservoir through a syringe [9,12,16]. By SEBM, the parts are manufactured by melting metal powder layer per layer with an electron beam in a high vacuum [8,9,14,16]. In SLS/SLM technology, layers of particular powder material (mainly polymers and porcelains in SLS and pure metals or alloys in SLM) are fused into a real detail by a computer-directed laser [8,9,12,17].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…According to it, the following 3D printing technologies are used in work with biomaterials: 3D ploting/direct ink writing, laser-assisted bioprinting, selective laser sintering, stereolithography, fused deposition modeling, and robot-assisted deposition/robocasting. The stereolithography (SLA), fused deposition modeling (FDM), selective electron beam melting (SEBM), selective laser sintering (SLS), selective laser melting (SLM), and ink-jet printing (IJP) are among the AT, mostly used in the dental medicine [8,9,[12][13][14][15].During the SLA process, a concentrated beam of UV light is focused on the surface of a tank illed with liquid photopolymer. As the light beam draws the object on the surface of the liquid, each time a layer of resin is polymerized or cross-linked until the real object is obtained [8,9,12,14,16].…”

mentioning

confidence: 99%

“…The stereolithography (SLA), fused deposition modeling (FDM), selective electron beam melting (SEBM), selective laser sintering (SLS), selective laser melting (SLM), and ink-jet printing (IJP) are among the AT, mostly used in the dental medicine [8,9,[12][13][14][15].…”

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confidence: 99%

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Properties of Co-Cr Dental Alloys Fabricated Using Additive Technologies

Dikova¹

2018

Biomaterials in Regenerative Medicine

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The aim of the present paper is to make a review of the properties of dental alloys, fabricated using Additive Technologies (AT). The microstructure and mechanical properties of Co-Cr alloys as well as the accuracy and surface roughness of dental constructions are discussed. In dentistry two diferent approaches can be applied for production of metal frameworks using AT. According to the irst one the wax/polymeric cast paterns are fabricated by 3D printing, than the constructions are cast from dental alloy with asprinted paterns. Through the second one the metal framework is manufactured form powder alloy directly from 3D virtual model by Selective Electron Beam Melting (SEBM) or Selective Laser Melting (SLM). The microstructure and mechanical properties of Co-Cr dental alloys, cast using 3D printed paterns, are typical for cast alloys. Their dimensional and adjustment accuracy is higher comparing to constructions, produced by traditional lost-wax casting or by SLM. The surface roughness is higher than that of the samples, cast by conventional technology, but lower comparing to the SLM objects. The microstructure of SLM Co-Cr dental alloys is ine grained and more homogeneous comparing that of the cast alloys, which deines higher hardness and mechanical properties, higher wear and corrosion resistance.Keywords: materials science and engineering, biomaterials, regenerative stomatology, additive technologies, Co-Cr dental alloys, microstructure and properties IntroductionDental alloys on the basis of cobalt and chromium are one of the most preferred for production of metal frameworks of dental constructions because of their high strength, high corrosion and wear resistance, high biocompatibility, and a relatively low cost [1,2]. The chemical composition of Co-Cr dental alloys consists of 53-67% of Co, 25-32% of Cr, 2-6% of Mo, and small © 2018 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.quantities of W, Si, Al, and others [3]. Cr, Mo, and W are added for strengthening of the solid solution. Due to the relatively large amount of Cr, dense passive layer of Cr 2 O 3 with 1-4 nm thickness on the surface as well as carbides in the microstructure of the details is formed, determining the high hardness, high corrosion, and wear resistance [4,5]. According to the phase diagram, Co-Cr dental alloys are characterized with face-centered cubic (fcc) latice, γ phase in high temperatures, and with hexagonal close packed (hcp) latice, ε phase in room temperature [4,6]. The γ phase deines the ductility, while the ε phase deines the corrosion and wear resistance of the alloy [7]. In proper alloying, the microstructure of the Co-Cr dental alloys consists mainly of γ phase and carbides of the M 23 C 6 type [4]. Therefore, the properties of Co-Cr dental alloys depend on the ratio between...

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