Selective Laser Melting in Dentistry

2010 ◽  
pp. 111-125 ◽  
Author(s):  
R. Strietzel
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Digital Data ◽  
Complex Geometries ◽  
Data Sets ◽  
Laser Melting ◽  
Data Set ◽  
First Choice ◽  
Cad Cam ◽  
Frame Work

Although casting is currently the first choice to produce metallic frame work selective laser melting (SLM) has established. Based on a CAD/CAM system the digital data of the frame work are transferred to the production machine. The three dimensional data set of the transferred in to numerous quasi 2-dimensional data. Each of these data sets represents a single slice, which is then produced. Due to the production process complex geometries and outstanding mechanical and chemical properites can be realized. Advantageously is also the large number of simultaneously fabricated parts, which makes this method very economic.

Fabrication of three-dimensional connected W-Cu10Sn composites by selective laser melting

2020 ◽  
Vol 264 ◽  
pp. 127377 ◽  
Author(s):  
Zhenlu Zhou ◽  
Zhen Tan ◽  
Dingyong He ◽  
Zheng Zhou ◽  
Li Cui ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Laser Melting

scholarly journals Fabrication Of Scaffolds From Ti6Al4V Powders Using The Computer Aided Laser Method

2015 ◽  
Vol 60 (2) ◽  
pp. 1065-1070 ◽  
Author(s):  
L.A. Dobrzański ◽  
A.D. Dobrzańska-Danikiewicz ◽  
P. Malara ◽  
T.G. Gaweł ◽  
L.B. Dobrzański ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
3D Model ◽  
Three Dimensional ◽  
Plaster Cast ◽  
Laser Melting ◽  
Laser Method ◽  
Porous Implant ◽  
Unit Cells ◽  
Dimensional Shape ◽  
3D Solid

AbstractThe aim of the research, the results of which are presented in the paper, is to fabricate, by Selective Laser Melting (SLM), a metallic scaffold with Ti6Al4V powder based on a virtual model corresponding to the actual loss of a patient’s craniofacial bone. A plaster cast was made for a patient with a palate recess, and the cast was then scanned with a 3D scanner to create a virtual 3D model of a palate recess, according to which a 3D model of a solid implant was created using specialist software. The virtual 3D solid implant model was converted into a 3D porous implant model after designing an individual shape of the unit cell conditioning the size and three-dimensional shape of the scaffold pores by multiplication of unit cells. The data concerning a virtual 3D porous implant model was transferred into a selective laser melting (SLM) device and a metallic scaffold was produced from Ti6Al4V powder with this machine, which was subjected to surface treatment by chemical etching. An object with certain initially adopted assumptions, i.e. shape and geometric dimensions, was finally achieved, which perfectly matches the patient bone recesses. The scaffold created was subjected to micro-and spectroscopic examinations.

scholarly journals Fracture of three-dimensional lattices manufactured by selective laser melting

2019 ◽  
Vol 180-181 ◽  
pp. 147-159 ◽  
Author(s):  
Huaiyuan Gu ◽  
Sheng Li ◽  
Martyn Pavier ◽  
Moataz M. Attallah ◽  
Charilaos Paraskevoulakos ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Three Dimensional ◽  
Laser Melting

Jewelry Fabrication via Selective Laser Melting of Glass

2014 ◽  
Author(s):  
Miranda Fateri ◽  
Andreas Gebhardt
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Glass Powder ◽  
Fabrication Process ◽  
Complex Geometries ◽  
Laser Melting ◽  
Conventional Methods

Selective Laser Melting (SLM) is one of the Additive Manufacturing (AM) technologies applicable for producing complex geometries which are typically expensive or difficult to fabricate using conventional methods. This process has been extensively investigated experimentally for various metals and the fabrication process parameters have been established for different applications; however, fabricating 3D glass objects using SLM technology has remained a challenge so far although it could have many applications. This paper presents a summery on various experimental evaluations of a material database incorporating the build parameters of glass powder using the SLM process for jewelry applications.

Applications of digital methodology to the NATMAP Shield Margin Project

1999 ◽  
Vol 36 (2) ◽  
pp. 161-173 ◽  
Author(s):  
H John Broome ◽  
David Viljoen
Keyword(s):  
Three Dimensional ◽  
Geological Mapping ◽  
Digital Data ◽  
Data Sets ◽  
Digital Products ◽  
Seismic Reflection Data ◽  
Cd Rom ◽  
Reflection Data ◽  
Mapping Process ◽  
Rectangular Area

The NATMAP Shield Margin Project, which began in 1991, straddles the Manitoba-Saskatchewan border and studied a rectangular area with east-west and north-south extents of approximately 250 and 150 km, respectively. Among the principal objectives of the NATMAP program were a compilation of a digital geoscience database for the study area and development of digital methodology to build this database and its utilization to aid in reaching the geological goals of the project. It was anticipated that these initiatives would encourage integrated interpretation of data, improve the effectiveness of the geological mapping process, and accelerate publication of results. One of the keys to effectively applying digital methods to a geological mapping project is maintaining data in digital form throughout the project, from the field through to publication. Transcription errors are eliminated and the production of both preliminary and final maps and digital products is accelerated. Access to digital data also facilitates application of digital tools for analysis and visualization. Integrated image products generated from geophysical and geological data sets were used throughout the project and assisted in development of geological models and their visualization. Three-dimensional visualization methods were used to combine NATMAP surface and subsurface mapping with Lithoprobe interpretations of seismic reflection data. The digital database was used to prepare a digital archive of the project which will be published in CD-ROM after completion of the project.

scholarly journals Accuracy of Low-Cost Alternative Facial Scanners: A Prospective Cohort Study.

2021 ◽  
Author(s):  
Alexander K. Bartella ◽  
Josefine Laser ◽  
Mohammad Kamal ◽  
Dirk Halama ◽  
Michael Neuhaus ◽  
...  
Keyword(s):  
Low Cost ◽  
Three Dimensional ◽  
Neck Surgery ◽  
Clinical Analysis ◽  
Smart Device ◽  
Data Sets ◽  
Average Deviation ◽  
Technical Improvement ◽  
Data Set ◽  
Significant Difference

Abstract Introduction: Three-dimensional facial scan images have been showing an increasingly important role in peri-therapeutic management of oral and maxillofacial and head and neck surgery cases. Face scan images can be open using optical facial scanners utilizing line-laser, stereophotography, structured light modality, or from volumetric data obtained from cone beam computed tomography (CBCT). The aim of this study is to evaluate, if two low-cost procedures for creating a three-dimensional face scan images are able to produce a sufficient data set for clinical analysis. Materials and methods: 50 healthy volunteers were included in the study. Two test objects with defined dimensions were attached to the forehead and the left cheek. Anthropometric values were first measured manually, and consecutively, face scans were performed with a smart device and manual photogrammetry and compared to the manually measured data sets.Results: Anthropometric distances on average deviated 2.17 mm from the manual measurement (smart device scanning 3.01 mm vs. photogrammetry 1.34 mm), with 7 out of 8 deviations were statistically significant. Of a total of 32 angles, 19 values showed a significant difference to the original 90° angles. The average deviation was 6.5° (smart device scanning 10.1° vs. photogrammetry 2.8°).Conclusion: Manual photogrammetry with a regular photo-camera shows higher accuracy than scanning with smart device. However, the smart device was more intuitive in handling and further technical improvement of the cameras used should be watched carefully.

scholarly journals Comparison of Marginal Integrity and Surface Roughness of Selective Laser Melting, CAD-CAM and Digital Light Processing Manufactured Co-Cr Alloy Copings

2021 ◽  
Vol 11 (18) ◽  
pp. 8328
Author(s):  
Abdulaziz S. Alqahtani ◽  
Abdullah M. AlFadda ◽  
Malek Eldesouky ◽  
Mazen K. Alnuwaiser ◽  
Samar Al-Saleh ◽  
...  
Keyword(s):  
Selective Laser Melting ◽  
Cobalt Chromium ◽  
Laser Melting ◽  
Digital Light Processing ◽  
Group 4 ◽  
Cad Cam ◽  
Ct Analysis ◽  
Group 3 ◽  
Group 2 ◽  
Cast Technique

The purpose of the present study was to evaluate the influence of fabrication techniques on the surface micro-roughness (Ra) and marginal misfit of cobalt chromium (CoCr) copings. A mandibular first molar was prepared for a metal ceramic crown. Forty metal copings were prepared and divided into groups (n = 10). Group 1, Casting-Lost wax technique (Cast-LWT), Group 2, CAD-CAM, Group 3, Selective laser melting (SLM), and Group 4, Digital light processing-Cast (DLP-Cast). Ra was measured using laser profilometry and marginal misfit was analyzed with Micro-CT. Analysis of variance (ANOVA), Tukey multiple comparison, and correlation coefficient tests were applied (p < 0.05). SLM technique showed the highest Ra (2.251 ± 0.310 μm) and the Cast-LWT group presented the lowest Ra (1.055 ± 0.184 μm). CAD-CAM copings showed statistically lower Ra compared with SLM samples (p = 0.028), but comparable Ra to DLP-Cast (p > 0.05). CoCr copings fabricated from the DLP-Cast technique demonstrated the highest marginal misfit (147.746 ± 30.306 μm) and the lowest misfit was established by SLM copings (27.193 ± 8.519 μm). The SLM technique displayed lower marginal misfit than DLP-Cast and CAD-CAM (p = 0.001), but comparable misfit to Cast-LWT copings. Ra influenced the marginal misfit in CAD-CAM, SLM, and DLP-Cast technique-fabricated copings. (p < 0.01). Marginal misfit and Ra of CoCr copings are contingent on the different fabrication techniques.

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