Direct Metal Laser Sintering: A Digitised Metal Casting Technology

Venkatesh, K.; Nandini, Vidyashree

doi:10.1007/s13191-013-0256-8

Cited by 66 publications

(42 citation statements)

References 8 publications

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“…Dentistry is familiar with the CAD/CAM technique. 7 The new techniques of making prosthetic restorations largely eliminate the help given by dental laboratories. 8 …”

Section: History Of 3d Printingmentioning

confidence: 99%

Digital Dentistry — 3D Printing Applications

Zaharia¹,

Gabor²,

Gavrilovici³

et al. 2017

Journal of Interdisciplinary Medicine

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Three-dimensional (3D) printing is an additive manufacturing method in which a 3D item is formed by laying down successive layers of material. 3D printers are machines that produce representations of objects either planned with a CAD program or scanned with a 3D scanner. Printing is a method for replicating text and pictures, typically with ink on paper. We can print different dental pieces using different methods such as selective laser sintering (SLS), stereolithography, fused deposition modeling, and laminated object manufacturing. The materials are certified for printing individual impression trays, orthodontic models, gingiva mask, and different prosthetic objects. The material can reach a flexural strength of more than 80 MPa. 3D printing takes the effectiveness of digital projects to the production phase. Dental laboratories are able to produce crowns, bridges, stone models, and various orthodontic appliances by methods that combine oral scanning, 3D printing, and CAD/CAM design. Modern 3D printing has been used for the development of prototypes for several years, and it has begun to find its use in the world of manufacturing. Digital technology and 3D printing have significantly elevated the rate of success in dental implantology using custom surgical guides and improving the quality and accuracy of dental work.

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“…Dentistry is familiar with the CAD/CAM technique. 7 The new techniques of making prosthetic restorations largely eliminate the help given by dental laboratories. 8 …”

Section: History Of 3d Printingmentioning

confidence: 99%

Digital Dentistry — 3D Printing Applications

Zaharia¹,

Gabor²,

Gavrilovici³

et al. 2017

Journal of Interdisciplinary Medicine

View full text Add to dashboard Cite

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“…The casting technique is a very laborious manual process that involves making a wax replica of the object, making a mold of the object, and then cast the melted metal into the mold. Owing to its complexity, this technique is strongly influenced by the skill of the dental technician . Moreover, producing RPDs by casting technique not only is time consuming and costly but may also generates low precision and ill‐fitting frameworks …”

Section: Introductionmentioning

confidence: 99%

Removable partial denture alloys processed by laser‐sintering technique

et al. 2017

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Removable partial dentures (RPDs) are traditionally made using a casting technique. New additive manufacturing processes based on laser sintering has been developed for quick fabrication of RPDs metal frameworks at low cost. The objective of this study was to characterize the mechanical, physical, and biocompatibility properties of RPD cobalt-chromium (Co-Cr) alloys produced by two laser-sintering systems and compare them to those prepared using traditional casting methods. The laser-sintered Co-Cr alloys were processed by the selective laser-sintering method (SLS) and the direct metal laser-sintering (DMLS) method using the Phenix system (L-1) and EOS system (L-2), respectively. L-1 and L-2 techniques were 8 and 3.5 times more precise than the casting (CC) technique (p < 0.05). Co-Cr alloys processed by L-1 and L-2 showed higher (p < 0.05) hardness (14-19%), yield strength (10-13%), and fatigue resistance (71-72%) compared to CC alloys. This was probably due to their smaller grain size and higher microstructural homogeneity. All Co-Cr alloys exhibited low porosity (2.1-3.3%); however, pore distribution was more homogenous in L-1 and L-2 alloys when compared to CC alloys. Both laser-sintered and cast alloys were biocompatible. In conclusion, laser-sintered alloys are more precise and present better mechanical and fatigue properties than cast alloys for RPDs. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 106B: 1174-1185, 2018.

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“…This technology might also be utilized to make structures from ceramic materials, titanium, or CoCr alloys by subtractive (eg, milling) or additive (eg, laser sintering) methods. Laser sintering methods, which can make complex parts in a short time by adding metallic powders, have gained popularity within prosthetic dentistry because of advantages such as decreasing fabrication costs, eliminating human errors, and creating substructures that are more dimensionally stable …”

Section: Discussionmentioning

confidence: 99%

“…Laser sintering methods, which can make complex parts in a short time by adding metallic powders, have gained popularity within prosthetic dentistry because of advantages such as decreasing fabrication costs, eliminating human errors, and creating substructures that are more dimensionally stable. 18,19 In this study, the effects of repeated firings on the color properties of differently manufactured PFM restorations were investigated. Although the L*, a*, and b* values were affected by the fabrication technique and the number of firings, the ΔE values up to the 10th firing were similar.…”

Section: Discussionmentioning

confidence: 99%

Do repeated firings affect the color properties of porcelain‐fused‐metal restorations that are fabricated differently?

Çelik

Tulga

2019

Color Research & Application

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Repeated firings can affect the quality of the porcelain color. The purpose of this study is to evaluate the effect of repeated firings on the color changes of porcelain‐fused‐metal restorations that are manufactured using different methods. A total of 60 cylindrical shaped cobalt–chromium alloys (Ø = 10 mm and h = 1.5 mm) were fabricated using casting (C), milling (M), direct metal laser sintering with and without annealing (EL+, EL‐), and selective laser melting with and without annealing (CL+, CL‐). The samples were veneered with A2 (as indicated by the Vita Shade Guide) dentin porcelain of 2 mm thickness. Then the samples subjected to the repeated firings (2nd, 4th, 6th, 8th, and 10th), and the color of each sample was recorded using a spectrophotometer. The CIEDE2000 (ΔE00) formula was used to calculate color differences of the samples on repeated firings. Repeated measures analysis of variance (ANOVA) and post‐hoc Tukey's test were utilized to analyze the results (a = 05). The L*, a*, and b* values of porcelain‐fused‐metal specimens were significantly affected by the number of firings (P < 0.001) and fabrication techniques (P < 0.001). The ΔE00 values for C, M, CL‐, and EL‐ groups after 10th firing were above 0.8 unit, which indicates that visually perceivable color differences are clinically acceptable. On the other hand, the ΔE00 values for CL+ and EL+ groups were above the PT value after 8th repeated firings. The color properties of porcelain‐fused‐metal restorations were affected by the fabrication techniques and the number of firings.

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Direct Metal Laser Sintering: A Digitised Metal Casting Technology

Cited by 66 publications

References 8 publications

Digital Dentistry — 3D Printing Applications

Digital Dentistry — 3D Printing Applications

Removable partial denture alloys processed by laser‐sintering technique

Do repeated firings affect the color properties of porcelain‐fused‐metal restorations that are fabricated differently?

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