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stereolithography

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https://www.readbyqxmd.com/read/28796822/growth-of-the-hard-palate-in-infants-with-down-syndrome-compared-with-healthy-infants-a-retrospective-case-control-study
#1
Daniel Klingel, Ariane Hohoff, Robert Kwiecien, Dirk Wiechmann, Thomas Stamm
OBJECTIVE: To investigate morphological differences of the hard palate in infants with Down syndrome (DS) compared with a volumetric-matched control group (CG). METHODS: Trial design: retrospective case control study. Based on inclusion and exclusion criteria, plaster casts of edentulous maxillae of 40 DS infants (20 females and 20 males, aged 221.3 ± 132.4 days) and 40 CG infants (20 females and 20 males, aged 53.9 ± 87.2 days) were digitized and converted into 3-dimensional stereolithography data...
2017: PloS One
https://www.readbyqxmd.com/read/28781073/accuracy-of-stereolithography-additive-casts-used-in-a-digital-workflow
#2
Hiba Al-Imam, Mia Gram, Ana R Benetti, Klaus Gotfredsen
STATEMENT OF PROBLEM: Despite the increasing demand for a digital workflow in the fabrication of indirect restorations, information on the accuracy of the resulting definitive casts is limited. PURPOSE: The purpose of this in vitro study was to compare the accuracy of definitive casts produced with digital scans and conventional impressions. MATERIAL AND METHODS: Chamfer preparations were made on the maxillary right canine and second molar of a typodont...
August 4, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28772496/influence-of-resin-composition-on-the-defect-formation-in-alumina-manufactured-by-stereolithography
#3
Emil Johansson, Oscar Lidström, Jan Johansson, Ola Lyckfeldt, Erik Adolfsson
Stereolithography (SL) is a technique allowing additive manufacturing of complex ceramic parts by selective photopolymerization of a photocurable suspension containing photocurable monomer, photoinitiator, and a ceramic powder. The manufactured three-dimensional object is cleaned and converted into a dense ceramic part by thermal debinding of the polymer network and subsequent sintering. The debinding is the most critical and time-consuming step, and often the source of cracks. In this study, photocurable alumina suspensions have been developed, and the influence of resin composition on defect formation has been investigated...
February 8, 2017: Materials
https://www.readbyqxmd.com/read/28771886/alternative-method-to-evaluate-the-adaptation-of-implant-supported-multi-unit-prosthetic-frameworks
#4
Ying Zhou, Yong Li, Xiao Ma, Yiqing Huang, Jiawei Wang
PURPOSE: Various methods to evaluate the adaptation of dental prostheses are available; however, only a few of these methods assess the adaptation of the framework as a whole. This study aimed to propose an alternative method to evaluate the adaptation of implant-supported multi-unit Co-Cr alloy frameworks. MATERIALS AND METHODS: A four-unit framework supported by two implants was designed using a computer. Six dots with a diameter of 0.2 mm were designed randomly using 3Shape software on the abutment surface of the framework for measurement...
August 3, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/28756658/polymers-for-3d-printing-and-customized-additive-manufacturing
#5
Samuel Clark Ligon, Robert Liska, Jürgen Stampfl, Matthias Gurr, Rolf Mülhaupt
Additive manufacturing (AM) alias 3D printing translates computer-aided design (CAD) virtual 3D models into physical objects. By digital slicing of CAD, 3D scan, or tomography data, AM builds objects layer by layer without the need for molds or machining. AM enables decentralized fabrication of customized objects on demand by exploiting digital information storage and retrieval via the Internet. The ongoing transition from rapid prototyping to rapid manufacturing prompts new challenges for mechanical engineers and materials scientists alike...
August 9, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28754244/3d-printed-biomaterials-with-regional-auxetic-properties
#6
John J Warner, Allison R Gillies, Henry H Hwang, Hong Zhang, Richard L Lieber, Shaochen Chen
Tissue engineering is replete with methods for inducing and mediating cell differentiation, which are crucial for ensuring proper regrowth of desired tissues. In this study, we developed a 3D-printed, non-positive Poisson's Ratio (NPPR) scaffold intended for future use in stretch-mediated cell differentiation applications, such as in muscle and tendon regeneration. We utilized dynamic optical projection stereolithography (DOPsL) to fabricate multi-layered, cell-laden NPPR scaffolds - these scaffolds can not only support aggregate cell growth, but can also be printed with locally-tunable force-displacement properties at length scales appropriate for tissue interaction...
May 19, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28740271/fabrication-of-a-3d-printing-definitive-obturator-prosthesis-a-clinical-report
#7
Theodoros Tasopoulos, Georgios Kouveliotis, Grigoris Polyzois, Vasiliki Karathanasi
INTRODUCTION: Digital technologies related to imaging and manufacturing provide the clinician with a wide variety of treatment options. Stereolithography (SLA) offers a simple and predictable way for an accurate reconstruction of congenital or acquired defects. CLINICAL CASE: A 65-years old cancer patient with non- keratinized squamous cell carcinoma of left maxillary sinus came for a prosthetic clinical evaluation. A bilateral maxillectomy was performed and the treatment plan included definite obturator prosthesis for the upper arch...
March 2017: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/28726951/facile-one-pot-exfoliation-and-integration-of-2d-layered-materials-by-dispersion-in-a-photocurable-polymer-precursor
#8
Alberto Gallardo, Yanina Pereyra, Enrique Martínez-Campos, Carolina García, David Acitores, Isabel Casado-Losada, Marián A Gómez-Fatou, Helmut Reinecke, Gary Ellis, Diego Acevedo, Juan Rodríguez-Hernández, Horacio J Salavagione
Efficient exfoliation of graphene and related materials (GRM) and fast and inexpensive integration/assembly are crucial to fulfil their full potential. A high degree of exfoliation in organic media can be achieved with high boiling point liquids that usually leave residues after drying, which is a handicap for many applications. Here, the effective exfoliation and dispersion of GRM in a vinyl monomer, which is subsequently converted to a functional polymer by photopolymerization, is reported. Nanocomposite membranes and three-dimensional objects are produced by the photo-curing process and stereolithography 3D printing, respectively...
August 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28717801/mimicking-arterial-thrombosis-in-a-3d-printed-microfluidic-in-vitro-vascular-model-based-on-computed-tomography-angiography-data
#9
Pedro F Costa, Hugo J Albers, John E A Linssen, Heleen H T Middelkamp, Linda van der Hout, Robert Passier, Albert van den Berg, Jos Malda, Andries D van der Meer
Arterial thrombosis is the main instigating factor of heart attacks and strokes, which result in over 14 million deaths worldwide every year. The mechanism of thrombosis involves factors from the blood and the vessel wall, and it also relies strongly on 3D vessel geometry and local blood flow patterns. Microfluidic chip-based vascular models allow controlled in vitro studies of the interaction between vessel wall and blood in thrombosis, but until now, they could not fully recapitulate the 3D geometry and blood flow patterns of real-life healthy or diseased arteries...
August 8, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28715970/scaffold-in-scaffold-potential-to-induce-growth-and-differentiation-of-cardiac-progenitor-cells
#10
Matteo Ciocci, Federico Mochi, Felicia Carotenuto, Emilia Di Giovanni, Paolo Prosposito, Roberto Francini, Fabio De Matteis, Igor Reshetov, Mauro Casalboni, Sonia Melino, Paolo Di Nardo
The design of reliable biocompatible and biodegradable scaffolds remains one of the most important challenges for tissue engineering. In fact, properly designed scaffolds must display an adequate and interconnected porosity to facilitate cell spreading and colonization of the inner layers, and must release physical signals concurring to modulate cell function to ultimately drive cell fate. In the present study, a combination of optimal mechanical and biochemical properties has been considered to design a one-component 3D multitextured hydrogel scaffold in order to favor cell-scaffold interactions...
July 17, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28713227/design-of-3-d-printed-concentric-tube-robots
#11
Tania K Morimoto, Allison M Okamura
Concentric tube surgical robots are minimally invasive devices with the advantages of snake-like reconfigurability, long and thin form factor, and placement of actuation outside the patient's body. These robots can also be designed and manufactured to acquire targets in specific patients for treating specific diseases in a manner that minimizes invasiveness. We propose that concentric tube robots can be manufactured using 3-D printing technology on a patient- and procedure-specific basis. In this paper, we define the design requirements and manufacturing constraints for 3-D printed concentric tube robots and experimentally demonstrate the capabilities of these robots...
December 2016: IEEE Transactions on Robotics: a Publication of the IEEE Robotics and Automation Society
https://www.readbyqxmd.com/read/28682611/forbidden-chemistry-two-photon-pathway-in-2-2-cycloaddition-of-maleimides
#12
Mikhail V Tsurkan, Christiane Jungnickel, Michael Schlierf, Carsten Werner
Two-photon excitation provides high spatial resolution in three dimensions of the corresponding chemical or physical processes, allowing submicrometer structuring in stereolithography and three-dimensional (3D) microfabrication. While studying two-photon structuring applications, we observed an undescribed phenomenon in photochemistry that dictates reactivity of maleimide groups in two-photon mode. A low-absorbance transition formerly ignored in classical photochemistry has been found for maleimides. This transition was assigned to symmetry-breaking donor-acceptor complex formation, which revealed a formally forbidden pathway in [2+2] cycloaddition reactions of maleimide moieties...
July 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28681488/endodontic-treatment-of-dens-evaginatus-by-performing-a-splint-guided-access-cavity
#13
Jesús Mena-Álvarez, Cristina Rico-Romano, Ana Belén Lobo-Galindo, Álvaro Zubizarreta-Macho
AIM: Dens evaginatus (DE) is described as an unusual dental malformation. Tooth structure variations attached to this anatomical disturbance complicates the performance of a conservative access cavity for a conventional root canal treatment. Author's purpose is to describe the treatment of a type V DE by using splits as guides to perform access cavity. CLINICAL CONSIDERATIONS: This clinical case shows a root canal treatment of a type V DE diagnosed by using a cone beam computed tomography (CBCT)...
July 6, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28663024/comparison-and-evaluation-of-marginal-and-internal-gaps-in-cobalt-chromium-alloy-copings-fabricated-using-subtractive-and-additive-manufacturing
#14
Dong-Yeon Kim, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: To evaluate the marginal and internal gaps of cobalt-chromium (Co-Cr) alloy copings fabricated using subtractive and additive manufacturing. METHODS: A study model of an abutment tooth 46 was prepared by a 2-step silicone impression with dental stone. Fifteen stereolithography files for Co-Cr alloy copings were compiled using a model scanner and dental CAD software. Using the lost wax (LW), wax block (WB), soft metal block (SMB), microstereolithography (μ-SLA), and selected laser melting (SLM) techniques, 15 Co-Cr alloy copings were fabricated per group...
June 26, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28651145/polymer-structure-property-requirements-for-stereolithographic-3d-printing-of-soft-tissue-engineering-scaffolds
#15
REVIEW
Ryan J Mondschein, Akanksha Kanitkar, Christopher B Williams, Scott S Verbridge, Timothy E Long
This review highlights the synthesis, properties, and advanced applications of synthetic and natural polymers 3D printed using stereolithography for soft tissue engineering applications. Soft tissue scaffolds are of great interest due to the number of musculoskeletal, cardiovascular, and connective tissue injuries and replacements humans face each year. Accurately replacing or repairing these tissues is challenging due to the variation in size, shape, and strength of different types of soft tissue. With advancing processing techniques such as stereolithography, control of scaffold resolution down to the μm scale is achievable along with the ability to customize each fabricated scaffold to match the targeted replacement tissue...
June 6, 2017: Biomaterials
https://www.readbyqxmd.com/read/28636642/in-vivo-evaluation-of-inter-operator-reproducibility-of-digital-dental-and-conventional-impression-techniques
#16
Emi Kamimura, Shinpei Tanaka, Masayuki Takaba, Keita Tachi, Kazuyoshi Baba
PURPOSE: The aim of this study was to evaluate and compare the inter-operator reproducibility of three-dimensional (3D) images of teeth captured by a digital impression technique to a conventional impression technique in vivo. MATERIALS AND METHODS: Twelve participants with complete natural dentition were included in this study. A digital impression of the mandibular molars of these participants was made by two operators with different levels of clinical experience, 3 or 16 years, using an intra-oral scanner (Lava COS, 3M ESPE)...
2017: PloS One
https://www.readbyqxmd.com/read/28632256/scanning-electron-microscopy-analysis-of-the-adaptation-of-single-unit-screw-retained-computer-aided-design-computer-aided-manufacture-abutments-after-mechanical-cycling
#17
Roberto Adrian Markarian, Deborah Pedroso Galles, Fabiana Mantovani Gomes França
PURPOSE: To measure the microgap between dental implants and custom abutments fabricated using different computer-aided design/computer-aided manufacture (CAD/CAM) methods before and after mechanical cycling. MATERIALS AND METHODS: CAD software (Dental System, 3Shape) was used to design a custom abutment for a single-unit, screw-retained crown compatible with a 4.1-mm external hexagon dental implant. The resulting stereolithography file was sent for manufacturing using four CAD/CAM methods (n = 40): milling and sintering of zirconium dioxide (ZO group), cobalt-chromium (Co-Cr) sintered via selective laser melting (SLM group), fully sintered machined Co-Cr alloy (MM group), and machined and sintered agglutinated Co-Cr alloy powder (AM group)...
June 20, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28626968/3d-printing-all-aromatic-polyimides-using-mask-projection-stereolithography-processing-the-nonprocessable
#18
Maruti Hegde, Viswanath Meenakshisundaram, Nicholas Chartrain, Susheel Sekhar, Danesh Tafti, Christopher B Williams, Timothy E Long
High-performance, all-aromatic, insoluble, engineering thermoplastic polyimides, such as pyromellitic dianhydride and 4,4'-oxydianiline (PMDA-ODA) (Kapton), exhibit exceptional thermal stability (up to ≈600 °C) and mechanical properties (Young's modulus exceeding 2 GPa). However, their thermal resistance, which is a consequence of the all-aromatic molecular structure, prohibits processing using conventional techniques. Previous reports describe an energy-intensive sintering technique as an alternative technique for processing polyimides with limited resolution and part fidelity...
June 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28554463/accuracy-of-printed-dental-models-made-with-2-prototype-technologies-and-different-designs-of-model-bases
#19
Leonardo Tavares Camardella, Oswaldo de Vasconcellos Vilella, Hero Breuning
INTRODUCTION: The aim of this study was to compare the accuracy of printed models from intraoral scans with different designs of model bases, using 2 types of 3-dimensional printing techniques. METHODS: Three types of model base design were created: regular base, horseshoe-shaped base, and horseshoe-shaped base with a bar connecting the posterior region. The digital models were printed with the 3-dimensional printers using different techniques: stereolithography and triple jetting technology (polyjet)...
June 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28552791/three-dimensional-printing-technologies-applications-and-limitations-in-neurosurgery
#20
REVIEW
Josephine U Pucci, Brandon R Christophe, Jonathan A Sisti, Edward S Connolly
Three-dimensional (3D) printers are a developing technology penetrating a variety of markets, including the medical sector. Since its introduction to the medical field in the late 1980s, 3D printers have constructed a range of devices, such as dentures, hearing aids, and prosthetics. With the ultimate goals of decreasing healthcare costs and improving patient care and outcomes, neurosurgeons are utilizing this dynamic technology, as well. Digital Imaging and Communication in Medicine (DICOM) can be translated into Stereolithography (STL) files, which are then read and methodically built by 3D Printers...
May 24, 2017: Biotechnology Advances
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