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stereolithography

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https://www.readbyqxmd.com/read/29023791/application-of-computed-tomography-and-stereolithography-to-correct-a-complex-angular-and-torsional-limb-deformity-in-a-donkey
#1
Alexandra Radtke, Samantha Morello, Peter Muir, Courtney Arnoldy, Jason Bleedorn
OBJECTIVE: To report the evaluation, surgical planning, and outcome for correction of a complex limb deformity in the tibia of a donkey using computed tomographic (CT) imaging and a 3D bone model. STUDY DESIGN: Case report. ANIMALS: A 1.5-year-old, 110 kg donkey colt with an angular and torsional deformity of the right pelvic limb. METHODS: Findings on physical examimation included a severe, complex deformity of the right pelvic limb that substantially impeded ambulation...
October 12, 2017: Veterinary Surgery: VS
https://www.readbyqxmd.com/read/28975415/contour-changes-after-guided-bone-regeneration-of-large-non-contained-mandibular-buccal-bone-defects-using-deproteinized-bovine-bone-mineral-and-a-porcine-derived-collagen-membrane-an-experimental-in-vivo-investigation
#2
I Sanz-Martin, L Ferrantino, F Vignoletti, J Nuñez, N Baldini, M Duvina, J Alcaraz, M Sanz
OBJECTIVE: The objective of this study was to evaluate soft tissue contour changes after three different regenerative therapies in chronic ridge defects. MATERIAL AND METHODS: Buccal bone defects were created in the mandible of nine beagle dogs. Augmentation procedures were performed 3 months later using a bone replacement graft (BRG), resorbable collagen membrane (MBG), or a combination of both procedures (CBG). Silicone impressions were taken before tooth extraction (T1), before the augmentation procedure (T2), and 3 months after the regenerative surgeries (T3)...
October 3, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28964546/three-dimensional-printing-role-in-neurologic-disease
#3
REVIEW
Adrien-Maxence Hespel
Three-dimensional printing has evolved dramatically in recent years and is now available for clinical use. Technical operations of 2 of the most common rapid prototyping processes (stereolithography and fused deposition modeling) and the steps involved in the creation of a prototype are discussed. Current applications in human neurosurgery including presurgical planning and educational opportunities are reviewed before focusing on the current applications in veterinary neurology.
September 27, 2017: Veterinary Clinics of North America. Small Animal Practice
https://www.readbyqxmd.com/read/28962741/effect-of-print-layer-height-and-printer-type-on-the-accuracy-of-3-dimensional-printed-orthodontic-models
#4
Christian S Favero, Jeryl D English, Benjamin E Cozad, John O Wirthlin, Megan M Short, F Kurtis Kasper
INTRODUCTION: Three-dimensional (3D) printing technologies enable production of orthodontic models from digital files; yet a range of variables associated with the process could impact the accuracy and clinical utility of the models. The objective of this study was to investigate the effect of print layer height on the accuracy of orthodontic models printed 3 dimensionally using a stereolithography format printer and to compare the accuracy of orthodontic models fabricated with several commercially available 3D printers...
October 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28961100/an-mri-compatible-hydrodynamic-simulator-of-cerebrospinal-fluid-motion-in-the-cervical-spine
#5
Suraj Thyagaraj, Soroush H Pahlavian, Lucas R Sass, Francis Loth, Morteza Vatani, Jao-Won Choi, R Shane Tubbs, Daniel Giese, Jan-Robert Kroger, Alexander C Bunck, Bryn A Martin
GOAL: Develop and test an MRI-compatible hydrodynamic simulator of cerebrospinal fluid (CSF) motion in the cervical spinal subarachnoid space. Four anatomically realistic subject-specific models were created based on a 22-year-old healthy volunteer and a five-year-old patient diagnosed with Chiari I malformation. METHODS: The in vitro models were based on manual segmentation of high-resolution T2-weighted MRI of the cervical spine. Anatomically realistic dorsal and ventral spinal cord nerve rootlets (NR) were added...
September 26, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28960285/using-resin-based-3d-printing-to-build-geometrically-accurate-proxies-of-porous-sedimentary-rocks
#6
Sergey Ishutov, Franciszek J Hasiuk, Dawn Jobe, Susan Agar
Three-dimensional (3D) printing is capable of transforming intricate digital models into tangible objects, allowing geoscientists to replicate the geometry of 3D pore networks of sedimentary rocks. We provide a refined method for building scalable pore-network models ("proxies") using stereolithography 3D printing that can be used in repeated flow experiments (e.g., core flooding, permeametry, porosimetry). Typically, this workflow involves two steps, model design and 3D printing. In this study, we explore how the addition of post-processing and validation can reduce uncertainty in the 3D-printed proxy accuracy (difference of proxy geometry from the digital model)...
September 28, 2017: Ground Water
https://www.readbyqxmd.com/read/28956046/3d-polymer-objects-with-electronic-components-interconnected-via-conformally-printed-electrodes
#7
Yejin Jo, Ju Young Kim, Sungmook Jung, Bok Yeop Ahn, Jennifer A Lewis, Youngmin Choi, Sunho Jeong
We report the fabrication of 3D polymer objects that contain electrical components interconnected by conductive silver/carbon nanotube inks printed conformally onto their surfaces and through vertical vias. Electrical components are placed within internal cavities and recessed surfaces of polymer objects produced by stereolithography. Conformally printed electrodes that interconnect each electrical component exhibit a conductivity of ∼2 × 10(4) S cm(-1) upon annealing at temperatures below 100 °C. Multiple 3D objects were created to demonstrate this hybrid additive manufacturing approach, including those with an embedded circuit operated by an air-suspended switch and a 3D circuit board composed of microcontroller unit, resistor, battery, light-emitting diode and sensor...
October 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28929935/development-of-arginine-glycine-aspartate-immobilized-3d-printed-poly-propylene-fumarate-scaffolds-for-cartilage-tissue-engineering
#8
Chi Bum Ahn, Youngjo Kim, Sung Jean Park, Yongsung Hwang, Jin Woo Lee
Poly(propylene fumarate) (PPF) has known to be a good candidate material for cartilage tissue regeneration because of its excellent mechanical properties during its degradation processes. Here, we describe the potential application of PPF-based materials as 3D printing bioinks to create macroporous cell scaffolds using micro-stereolithography (MSTL). To improve cell-matrix interaction of seeded human chondrocytes within the PPF-based 3D scaffolds, we immobilized arginine-glycine-aspartate (RGD) peptide onto the PPF scaffolds...
September 20, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28922139/3d-printed-multiplexed-electrospinning-sources-for-large-scale-production-of-aligned-nanofiber-mats-with-small-diameter-spread
#9
Erika García-López, Daniel Olvera-Trejo, Luis F Velásquez-García
We report the design, fabrication, and characterization of novel, low-cost, and modular miniaturized nanofiber electrospinning sources for the scalable production of non-woven aligned nanofiber mats with low diameter variation. The devices are monolithic arrays of electrospinning emitters made via stereolithography; the emitters are arranged so each element has an independent line of sight to a rotating collector surface. Linear and zigzag emitter packing were evaluated using a PEO solution with the aim of maximizing the throughput of nanofibers with the smallest diameter and narrowest distribution...
October 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28876895/3d-printing-of-photocurable-cellulose-nanocrystal-composite-for-fabrication-of-complex-architectures-via-stereolithography
#10
Napolabel B Palaganas, Joey Dacula Mangadlao, Al Christopher C de Leon, Jerome O Palaganas, Katrina D Pangilinan, Yan Jie Lee, Rigoberto C Advincula
The advantages of 3D printing on cost, speed, accuracy, and flexibility have attracted several new applications in various industries especially in the field of medicine where customized solutions are highly demanded. Although this modern fabrication technique offers several benefits, it also poses critical challenges in materials development suitable for industry use. Proliferation of polymers in biomedical application has been severely limited by their inherently weak mechanical properties despite their other excellent attributes...
October 4, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28874989/evaluation-of-marginal-and-internal-gaps-in-single-and-three-unit-metal-frameworks-made-by-micro-stereolithography
#11
Dong-Yeon Kim, Ha-Na Lee, Ji-Hwan Kim, Hae-Young Kim, Woong-Chul Kim
PURPOSE: The purpose of this study is to compare single and three-unit metal frameworks that are produced by micro-stereolithography. MATERIALS AND METHODS: Silicone impressions of a selected molar and a premolar were used to make master abutments that were scanned into a stereolithography file. The file was processed with computer aided design software to create single and three-unit designs from which resin frameworks were created using micro-stereolithography...
August 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28863923/accuracy-of-3-dimensional-curvilinear-measurements-on-digital-models-with-intraoral-scanners
#12
Spencer Mack, Tammy Bonilla, Jeryl D English, Benjamin Cozad, Sercan Akyalcin
INTRODUCTION: Our objectives were to evaluate and compare the digital dental models generated from 2 commercial intraoral scanners with manual measurements when performing 3-dimensional surface measurements along a curved line (curvilinear). METHODS: Dry mandibles (n = 61) with intact dentition were used. The mandibles were digitized using 2 chair-side intraoral scanners: Cadent iTero (Align Technology, San Jose, Calif) and Lythos Digital Impression system (Ormco, Orange, Calif)...
September 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28862464/use-of-cbct-imaging-open-source-modeling-software-and-desktop-stereolithography-3d-printing-to-duplicate-a-removable-dental-prosthesis-a-proof-of-concept
#13
Wei-Shao Lin, Bryan T Harris, Dean Morton
This article describes an alternative computer-aided design/computer-aided manufacturing (CAD/CAM) technique that uses cone-beam computed tomography (CBCT) imaging, open-source 3-dimensional (3D) modeling software, and a desktop stereolithography (SLA) 3D printer to duplicate an existing complete removable dental prosthesis (CRDP). Intended to offer a proof of concept, this proposed technique provides dental clinicians who have access to a CBCT imaging unit and a desktop SLA 3D printer an option to manufacture a duplicated prosthesis in-office...
September 2017: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/28837043/a-3d-printed-microfluidic-perfusion-device-for-multicellular-spheroid-cultures
#14
Louis Ong, Anik Badhan Islam, Ramanuj DasGupta, Narayanan Gopalakrishna Iyer, Hwa Liang Leo, Yi-Chin Toh
The advent of 3D printing technologies promises to make microfluidic organ-on-chip technologies more accessible for the biological research community. To date, hydrogel-encapsulated cells have been successfully incorporated into 3D printed microfluidic devices. However, there is currently no 3D printed microfluidic device that can support multicellular spheroid culture, which facilitates extensive cell-cell contacts important for recapitulating many multicellular functional biological structures. Here, we report a first instance of fabricating a 3D printed microfluidic cell culture device capable of directly immobilizing and maintaining the viability and functionality of 3D multicellular spheroids...
August 24, 2017: Biofabrication
https://www.readbyqxmd.com/read/28835598/influence-of-material-thickness-on-fractural-strength-of-cad-cam-fabricated-ceramic-crowns
#15
Moritz Zimmermann, Gustav Egli, Markus Zaruba, Albert Mehl
The fracture behavior of CAD/CAM fabricated crowns was investigated as a function of material thickness for six silicate ceramic materials: Mark II, e.max CAD, Celtra Duo milled, Celtra Duo fired, Suprinity, Enamic. Crowns with thicknesses 0.5/1.0/1.5 mm were fabricated with CEREC and adhesively seated to dies fabricated with stereolithography technology (n=144). Thermomechanical loading and fractural loading was performed. Statistical analysis was done with one-way ANOVA and post-hoc Scheffé test. For 1.5 mm, all crowns survived fatigue testing, for 1...
August 24, 2017: Dental Materials Journal
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
#16
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
#17
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
#18
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
#19
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
#20
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
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