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https://www.readbyqxmd.com/read/29201905/evaluation-of-resins-for-stereolithographic-3d-printed-surgical-guides-the-response-of-l929-cells-and-human-gingival-fibroblasts
#1
Christoph Kurzmann, Klara Janjić, Hassan Shokoohi-Tabrizi, Michael Edelmayer, Manuela Pensch, Andreas Moritz, Hermann Agis
Additive manufacturing is becoming increasingly important in dentistry for the production of surgical guides. The development of cost-effective desktop stereolithography (SLA) printing systems and the corresponding resins makes this novel technique accessible to dental offices and dental laboratories. The aim of the study was to reveal the response of soft tissue cells to Clear and Dental SG resins used in desktop SLA printing systems at different stages of processing. Cell activity of L929 cells and gingival fibroblasts (GF) in response to the materials was examined in indirect and direct monolayer culture models and a direct spheroid culture model based on MTT, resazurin-based toxicity assays, and live-dead staining...
2017: BioMed Research International
https://www.readbyqxmd.com/read/29171264/radiopaque-resists-for-two-photon-lithography-to-enable-submicron-3d-imaging-of-polymer-parts-via-x-ray-computed-tomography
#2
Sourabh Kumar Saha, James Spencer Oakdale, Jefferson Cuadra, Chuck Divin, Jianchao Ye, Jean-Baptiste Forien, Leonardus Bayu Aji, Juergen Biener, William Smith
Two-photon lithography (TPL) is high-resolution additive manufacturing (AM) technique capable of producing arbitrarily complex 3D micro-structures with features two to three orders of magnitude finer than a human hair. This process finds numerous applications as a direct route towards the fabrication of novel optical and mechanical metamaterials, miniaturized optics, microfluidics, biological scaffolds and various other intricate 3D parts. As TPL matures, metrology and inspection become a crucial step in the manufacturing process to ensure that the geometric form of the end-product meets design specifications...
November 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29170867/a-novel-fabrication-method-of-carbon-electrodes-using-3d-printing-and-chemical-modification-process
#3
Pan Tian, Chaoyang Chen, Jie Hu, Jin Qi, Qianghua Wang, Jimmy Ching-Ming Chen, John Cavanaugh, Yinghong Peng, Mark Ming-Cheng Cheng
Three-dimensional (3D) printing is an emerging technique in the field of biomedical engineering and electronics. This paper presents a novel biofabrication method of implantable carbon electrodes with several advantages including fast prototyping, patient-specific and miniaturization without expensive cleanroom. The method combines stereolithography in additive manufacturing and chemical modification processes to fabricate electrically conductive carbon electrodes. The stereolithography allows the structures to be 3D printed with very fine resolution and desired shapes...
November 23, 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/29156138/plasmonic-sensing-with-3d-printed-optics
#4
Samuel S Hinman, Kristy S McKeating, Quan Cheng
Three-dimensional (3D) printing has undergone an exponential growth in popularity due to its revolutionary and near limitless manufacturing capabilities. Recent trends have seen this technology utilized across a variety of scientific disciplines, including the measurement sciences, but precise fabrication of optical components for high-performance biosensing has not yet been demonstrated. We report here 3D printing of high-quality, custom prisms by stereolithography that enable Kretschmann-configured plasmonic sensing of bacterial toxins...
November 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29148121/position-accuracy-of-implant-analogs-on-3d-printed-polymer-versus-conventional-dental-stone-casts-measured-using-a-coordinate-measuring-machine
#5
Marta Revilla-León, Óscar Gonzalez-Martín, Javier Pérez López, José Luis Sánchez-Rubio, Mutlu Özcan
PURPOSE: To compare the accuracy of implant analog positions on complete edentulous maxillary casts made of either dental stone or additive manufactured polymers using a coordinate measuring machine (CMM). MATERIAL AND METHODS: A completely edentulous maxillary model of a patient with 7 implant analogs was obtained. From this model, two types of casts were duplicated, namely conventional dental stone (CDS) using a custom tray impression technique after splinting (N = 5) and polymer cast using additive manufacturing based on the STL file generated...
November 17, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29141120/biotinylated-photopolymers-for-3d-printed-unibody-lab-on-a-chip-optical-platforms
#6
Caterina Credi, Gianmarco Griffini, Marinella Levi, Stefano Turri
The present work reports the first demonstration of straightforward fabrication of monolithic unibody lab-on-a-chip (ULOCs) integrating bioactive micrometric 3D scaffolds by means of multimaterial stereolithography (SL). To this end, a novel biotin-conjugated photopolymer is successfully synthesized and optimally formulated to achieve high-performance SL-printing resolution, as demonstrated by the SL-fabrication of biotinylated structures smaller than 100 µm. By optimizing a multimaterial single-run SL-based 3D-printing process, such biotinylated microstructures are incorporated within perfusion microchambers whose excellent optical transparency enables real-time optical microscopy analyses...
November 15, 2017: Small
https://www.readbyqxmd.com/read/29125215/additive-manufacturing-a-comparative-analysis-of-dimensional-accuracy-and-skin-texture-reproduction-of-auricular-prostheses-replicas
#7
Alexey Unkovskiy, Sebastian Spintzyk, Detlef Axmann, Eva-Maria Engel, Heiner Weber, Fabian Huettig
PURPOSE: The use of computer-aided design/computer-aided manufacturing (CAD/CAM) and additive manufacturing in maxillofacial prosthetics has been widely acknowledged. Rapid prototyping can be considered for manufacturing of auricular prostheses. Therefore, so-called prostheses replicas can be fabricated by digital means. The objective of this study was to identify a superior additive manufacturing method to fabricate auricular prosthesis replicas (APRs) within a digital workflow. MATERIALS AND METHODS: Auricles of 23 healthy subjects (mean age of 37...
November 10, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29110921/3d-printed-versus-conventionally-cured-provisional-crown-and-bridge-dental-materials
#8
Anthony Tahayeri, MaryCatherine Morgan, Ana P Fugolin, Despoina Bompolaki, Avathamsa Athirasala, Carmem S Pfeifer, Jack L Ferracane, Luiz E Bertassoni
OBJECTIVES: To optimize the 3D printing of a dental material for provisional crown and bridge restorations using a low-cost stereolithography 3D printer; and compare its mechanical properties against conventionally cured provisional dental materials. METHODS: Samples were 3D printed (25×2×2mm) using a commercial printable resin (NextDent C&B Vertex Dental) in a FormLabs1+ stereolithography 3D printer. The printing accuracy of printed bars was determined by comparing the width, length and thickness of samples for different printer settings (printing orientation and resin color) versus the set dimensions of CAD designs...
October 27, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29065670/gentamicin-released-from-porous-scaffolds-fabricated-by-stereolithography
#9
Somruethai Channasanon, Pareeya Udomkusonsri, Surapol Chantaweroad, Passakorn Tesavibul, Siriporn Tanodekaew
Porous oligolactide-hydroxyapatite composite scaffolds were obtained by stereolithographic fabrication. Gentamicin was then coated on the scaffolds afterwards, to achieve antimicrobial delivery ability to treat bone infection. The scaffolds examined by stereomicroscope, SEM, and μCT-scan showed a well-ordered pore structure with uniform pore distribution and pore interconnectivity. The physical and mechanical properties of the scaffolds were investigated. It was shown that not only porosity but also scaffold structure played a critical role in governing the strength of scaffolds...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29064377/3d-printing-nano-conductive-multi-walled-carbon-nanotube-scaffolds-for-nerve-regeneration
#10
Se-Jun Lee, Wei Zhu, Margaret Nowicki, Grace Lee, Dong Nyoung Heo, Junghoon Kim, Yi Zuo, Lijie Grace Zhang
In recent years, the development of tissue-engineered 3D scaffolds for various regenerative engineering applications has been widely investigated. Hydrogel polymers are extensively used as tissue engineering scaffold materials due to their unique biocompatible features. However, hydrogel based scaffolds often suffer from weak mechanical strength and a lack of functional groups to enhance cell adhesion. Hence, nanomaterials, such as carbon nanotubes (CNTs), have been introduced to modify the surface properties of scaffolds, thus enhancing the interaction between the neural cells and biomaterials...
October 24, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29060188/visible-light-based-stereolithography-bioprinting-of-cell-adhesive-gelatin-hydrogels
#11
Zongjie Wang, Zhenlin Tian, Xian Jin, Jonathan F Holzman, Frederic Menard, Keekyoung Kim
Stereolithography-based bioprinting offers advantages in resolution and rapid printing time, and thus has received major attention in recent years. However, traditional stereolithography-based bioprinting utilizes an ultraviolet light which may cause mutagenesis and carcinogenesis of cells. In this paper, we present a new visible light crosslinkable bioink that is based on cell-adhesive gelatin. The bioink consists of Eosin Y (EY) based photoinitiator and gelatin methacrylate (GelMA) pre-polymer solution. We examined the feasibility of using visible light from a commercial beam projector to pattern the EY-GelMA bioink...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29047370/the-recent-development-and-applications-of-fluidic-channels-by-3d-printing
#12
REVIEW
Yufeng Zhou
The technology of "Lab-on-a-Chip" allows the synthesis and analysis of chemicals and biological substance within a portable or handheld device. The 3D printed structures enable precise control of various geometries. The combination of these two technologies in recent years makes a significant progress. The current approaches of 3D printing, such as stereolithography, polyjet, and fused deposition modeling, are introduced. Their manufacture specifications, such as surface roughness, resolution, replication fidelity, cost, and fabrication time, are compared with each other...
October 18, 2017: Journal of Biomedical Science
https://www.readbyqxmd.com/read/29042960/application-of-3d-printing-rapid-prototyping-assisted-percutaneous-fixation-in-the-treatment-of-intertrochanteric-fracture
#13
Sheng-Nai Zheng, Qing-Qiang Yao, Feng-Yong Mao, Peng-Fei Zheng, Shu-Chang Tian, Jia-Yi Li, Yi-Fan Yu, Shuai Liu, Jin Zhou, Jun Hu, Yan Xu, Kai Tang, Yue Lou, Li-Ming Wang
The aim of the present study was to investigate the application of 3D printing (3DP) rapid prototyping (RP) technique-assisted percutaneous fixation in the treatment of femoral intertrochanteric fracture (ITF) using proximal femoral nail anti-rotation (PFNA). A total of 39 patients with unstable ITF were included in the current study. Patients were divided into two groups: 19 patients were examined using computed tomography scanning and underwent PFNA with SDP-RP whereas the other 20 patients underwent conventional PFNA treatment...
October 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29023791/application-of-computed-tomography-and-stereolithography-to-correct-a-complex-angular-and-torsional-limb-deformity-in-a-donkey
#14
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...
November 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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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