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https://www.readbyqxmd.com/read/29906672/displacement-of-teeth-without-and-with-bonded-fixed-orthodontic-retainers-3d-analysis-using-triangular-target-frames-and-optoelectronic-motion-tracking-device
#1
Firas Chakroun, Vera Colombo, Dave Lie Sam Foek, Luigi Maria Gallo, Albert Feilzer, Mutlu Özcan
PURPOSE: The objective of this study was to evaluate the anterior tooth movement without and with bonded fixed orthodontic retainers under incremental loading conditions. MATERIALS AND METHODS: Six extracted mandibular anterior human teeth were embedded in acrylic resin in True Form I Arch type and 3D reconstruction of Digital Volume Tomography (DVT) images (0.4 mm3 voxels) were obtained. The anatomy of each tooth was segmented and digitally reconstructed using 3D visualization software for medical images (AMIRA, FEI SVG)...
June 6, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29906220/three-dimensional-printing-of-personalized-nasal-stents-for-patients-with-cleft-lip
#2
Dongyuan Luo, Ting Li, Hongtao Wang, Yiyang Chen
OBJECTIVE: This report describes the design and printing of personalized nasal stents for cleft lip using 3-dimensional (3D) technology. MATERIALS AND METHODS: We used silicone rubber to make the impressions, a 3D laser scanner to obtain 3D data, and Dental SG resin cartridges as printing material. We printed the personalized nasal stents using a photosensitive resin printer. RESULTS: We placed the stents in patients after cleft lip surgery...
January 1, 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29905512/cranioplasty-with-a-low-cost-customized-polymethylmethacrylate-implant-using-a-desktop-3d-printer
#3
Jesús A Morales-Gómez, Everardo Garcia-Estrada, Jorge E Leos-Bortoni, Miriam Delgado-Brito, Luis E Flores-Huerta, Adriana A De La Cruz-Arriaga, Luis J Torres-Díaz, Ángel R Martínez-Ponce de León
OBJECTIVE Cranioplasty implants should be widely available, low in cost, and customized or easy to mold during surgery. Although autologous bone remains the first choice for repair, it cannot always be used due to infection, fragmentation, bone resorption, or other causes, which led to use of synthetic alternatives. The most frequently used allogenic material for cranial reconstructions with long-term results is polymethylmethacrylate (PMMA). Three-dimensional printing technology has allowed the production of increasingly popular customized, prefabricated implants...
June 15, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29904715/mechanical-thermal-morphological-and-rheological-characteristics-of-high-performance-3d-printing-lignin-based-composites-for-additive-manufacturing-applications
#4
Ngoc A Nguyen, Christopher C Bowland, Amit K Naskar
The article presents different mechanical, thermal and rheological data corresponding to the morphological formation within various renewable lignin-based composites containing acrylonitrile butadiene styrene (ABS), acrylonitrile butadiene rubber (NBR41, 41 mol% nitrile content), and carbon fibers (CFs). The data of 3D-printing properties and morphology of 3D-printed layers of selected lignin-based composites are revealed. This data is related to our recent research article entitled "A general method to improve 3D-printability and inter-layer adhesion in lignin-based composites" (Nguyen et al...
August 2018: Data in Brief
https://www.readbyqxmd.com/read/29904650/data-related-to-the-experimental-design-for-powder-bed-binder-jetting-additive-manufacturing-of-silicone
#5
Farzad Liravi, Mihaela Vlasea
The data included in this article provides additional supporting information on our recent publication (Liravi et al., 2018 [1]) on a novel hybrid additive manufacturing (AM) method for fabrication of three-dimensional (3D) structures from silicone powder. A design of experiments (DoE) study has been carried out to optimize the geometrical fidelity of AM-made parts. This manuscript includes the details of a multi-level factorial DOE and the response optimization results. The variation in the temperature of powder-bed when exposed to heat is plotted as well...
June 2018: Data in Brief
https://www.readbyqxmd.com/read/29904165/the-effects-of-printing-orientation-on-the-electrochemical-behaviour-of-3d-printed-acrylonitrile-butadiene-styrene-abs-carbon-black-electrodes
#6
Hairul Hisham Bin Hamzah, Oliver Keattch, Derek Covill, Bhavik Anil Patel
Additive manufacturing also known as 3D printing is being utilised in electrochemistry to reproducibly develop complex geometries with conductive properties. In this study, we explored if the electrochemical behavior of 3D printed acrylonitrile butadiene styrene (ABS)/carbon black electrodes was influenced by printing direction. The electrodes were printed in both horizontal and vertical directions. The horizsontal direction resulted in a smooth surface (HPSS electrode) and a comparatively rougher surface (HPRS electrode) surface...
June 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29903557/3d-volume-rendering-and-3d-printing-additive-manufacturing
#7
REVIEW
Rujuta A Katkar, Robert M Taft, Gerald T Grant
Three-dimensional (3D) volume-rendered images allow 3D insight into the anatomy, facilitating surgical treatment planning and teaching. 3D printing, additive manufacturing, and rapid prototyping techniques are being used with satisfactory accuracy, mostly for diagnosis and surgical planning, followed by direct manufacture of implantable devices. The major limitation is the time and money spent generating 3D objects. Printer type, material, and build thickness are known to influence the accuracy of printed models...
July 2018: Dental Clinics of North America
https://www.readbyqxmd.com/read/29903062/3d-printed-artificial-teeth-accuracy-and-application-in-root-canal-therapy
#8
Xiao Liang, Weili Liao, Huaxiong Cai, Sui Jiang, Siqi Chen
This study examined the compatibility of 3D-printed artificial teeth and extracted teeth by combining oral cone-beam computed tomography (CBCT) and multi-jet printing technology to print the extracted teeth in vitro. The 3D-printed artificial teeth were then used to choose a master gutta-percha with an appropriate working length and taper to fill root canals. The quality of root canal-filling was evaluated via X-ray. Twenty orthodontically extracted premolars with a single root canal were collected and CBCT-scanned, and the scan data were extracted and converted to 3D models using MIMICS software, which in turn were used to 3D-print artificial teeth using multi-jet printing technology...
August 1, 2018: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29902896/-detection-of-antioxidant-activity-of-danhong-injection-and-its-intermediate-with-a-paper-based-analytical-device
#9
Shang-Xin Guo, Jing-Yuan Shao, Yi Wang, Hai-Bin Qu, Xing-Chu Gong
The paper-based analytical device (PAD) was applied in this study to analyze the antioxidant activity of Danhong injection and its intermediates. First polycaprolactone was printed on the surface of a filter paper with a 3D printing device. The modified filter paper was then prepared using polycaprolactone and solid paraffin as the modifiers. The PAD was prepared after adding DPPH ethanol solution to the modified filter paper. Ascorbic acid solutions with different concentrations were used as the positive drug on PAD...
May 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29902517/chitosan-coated-liposome-dry-powder-formulations-loaded-with-ghrelin-for-nose-to-brain-delivery
#10
Laurent Salade, Nathalie Wauthoz, Marjorie Vermeersch, Karim Amighi, Jonathan Goole
The nose-to-brain delivery of ghrelin loaded in liposomes is a promising approach for the management of cachexia. It could limit the plasmatic degradation of ghrelin and provide direct access to the brain, where ghrelin's specific receptors are located. Anionic liposomes coated with chitosan in either a liquid or a dry-powder formulation were compared. The powder formulation showed stronger adhesion to mucins (89 ± 4% vs 61 ± 4%), higher ghrelin entrapment efficiency (64 ± 2% vs 55 ± 4%), higher enzymatic protection against trypsin (26 ± 2% vs 20 ± 3%) and lower ghrelin storage degradation at 25°C (2...
June 11, 2018: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/29901628/3d-printing-of-intracranial-aneurysm-based-on-intracranial-digital-subtraction-angiography-and-its-clinical-application
#11
Jian-Li Wang, Zi-Gang Yuan, Guo-Liang Qian, Wu-Qiao Bao, Guo-Liang Jin
The study aimed to develop simulation models including intracranial aneurysmal and parent vessel geometries, as well as vascular branches, through 3D printing technology. The simulation models focused on the benefits of aneurysmal treatments and clinical education. This prospective study included 13 consecutive patients who suffered from intracranial aneurysms confirmed by digital subtraction angiography (DSA) in the Neurosurgery Department of Shaoxing People's Hospital. The original 3D-DSA image data were extracted through the picture archiving and communication system and imported into Mimics...
June 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29900676/feasibility-and-biocompatibility-of-3d-printed-photopolymerized-and-laser-sintered-polymers-for-neuronal-myogenic-and-hepatic-cell-types
#12
Rowan P Rimington, Andrew J Capel, Darren J Player, Richard J Bibb, Steven D R Christie, Mark P Lewis
The integration of additive manufacturing (AM) technology within biological systems holds significant potential, specifically when refining the methods utilized for the creation of in vitro models. Therefore, examination of cellular interaction with the physical/physicochemical properties of 3D-printed polymers is critically important. In this work, skeletal muscle (C2 C12 ), neuronal (SH-SY5Y) and hepatic (HepG2) cell lines are utilized to ascertain critical evidence of cellular behavior in response to 3D-printed candidate polymers: Clear-FL (stereolithography, SL), PA-12 (laser sintering, LS), and VeroClear (PolyJet)...
June 13, 2018: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29900562/3d-printed-replicas-for-endodontic-education
#13
M Reymus, C Fotiadou, A Kessler, K Heck, R Hickel, C Diegritz
AIM: To assess the feasibility of producing artificial teeth for endodontic training using 3D printing technology, to analyse the accuracy of the printing process, and to evaluate the teeth by students when used during training. METHODOLOGY: Sound extracted human teeth were selected, digitalized by cone beam computed tomography (CBCT) and appropriate software and finally reproduced by a stereolithographic printer. The printed teeth were scanned and compared with the original ones (trueness) and to one another (precision)...
June 14, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29900182/derotational-osteotomy-of-the-distal-femur-for-the-treatment-of-patellofemoral-instability-simultaneously-leads-to-the-correction-of-frontal-alignment-a-laboratory-cadaveric-study
#14
Florian B Imhoff, Knut Beitzel, Philip Zakko, Elifho Obopilwe, Andreas Voss, Bastian Scheiderer, Daichi Morikawa, Augustus D Mazzocca, Robert A Arciero, Andreas B Imhoff
Background: Derotational osteotomy of the distal femur allows the anatomic treatment of patellofemoral maltracking due to increased femoral antetorsion. However, such rotational osteotomy procedures have a high potential of intended/unintended changes of frontal alignment. Purpose/Hypothesis: The purpose of this study was to perform derotational osteotomy of the distal femur and to demonstrate the utility of a novel trigonometric approach to address 3-dimensional (3D) changes on 2-dimensional imaging (axial computed tomography [CT] and frontal-plane radiography)...
June 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29899654/implantation-of-customized-preshaped-implant-for-orbital-fractures-with-the-aid-of-three-dimensional-printing
#15
Sirous Nekooei, Mahsa Sardabi, Mohammad Etezad Razavi, Amirhossein Nekooei, Mohammad Yaser Kiarudi
Orbital floor fractures alone or in conjunction with other facial skeletal fractures are the most commonly encountered midfacial fractures. The technological advances in 3-dimensional (3D) printing allow the physical prototyping of 3D models, so creates an accurate representation of the patient's specific anatomy. A 56-year-old Caucasian man with severe hypoglobus and enophthalmos with an extensive blowout fracture was scheduled for reconstruction. First, 3D physical models were created based on the computed tomography scan datasets from patient...
January 2018: Middle East African Journal of Ophthalmology
https://www.readbyqxmd.com/read/29899592/use-of-material-decomposition-in-the-context-of-neurovascular-intervention-using-standard-flat-panel-and-a-high-resolution-cmos-detector
#16
A R Podgorsak, A C Venkataraman, S V Setlur Nagesh, D R Bednarek, S Rudin, A Siddiqui, C N Ionita
The imaging of endovascular devices during neurovascular procedures such as the coiling of aneurysms guided with CBCT imaging may be challenging due to the presence of highly attenuating materials such as platinum in the coil and stent marker, nickel-titanium in the stent, iodine in the contrast agent, and tantalum in the embolization agent. The use of dual-energy imaging followed by a basis material decomposition image processing-scheme may improve the feature separation and recognition. Two sets of testing were performed to validate this concept...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29899591/3d-printed-cardiovascular-patient-specific-phantoms-used-for-clinical-validation-of-a-ct-derived-ffr-diagnostic-software
#17
Kelsey N Sommer, Lauren Shepard, Nitant Vivek Karkhanis, Vijay Iyer, Erin Angel, Michael F Wilson, Frank J Rybicki, Dimitrios Mitsouras, Stephen Rudin, Ciprian N Ionita
Purpose: 3D printed patient specific vascular models provide the ability to perform precise and repeatable benchtop experiments with simulated physiological blood flow conditions. This approach can be applied to CT-derived patient geometries to determine coronary flow related parameters such as Fractional Flow Reserve (FFR). To demonstrate the utility of this approach we compared bench-top results with non-invasive CT-derived FFR software based on a computational fluid dynamics algorithm and catheter based FFR measurements...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29899587/initial-investigations-of-a-special-high-definition-hi-def-zoom-capability-in-a-new-detector-system-for-neuro-interventional-procedures
#18
S V Setlur Nagesh, A Shankar, J Krebs, J Hinaman, D R Bednarek, S Rudin
Real-time visualization of fine details ranging to 100 um or less in neuro-vascular imaging guided interventions is important. A separate high-resolution detector mounted on a standard flat panel detector (FPD) was previously reported. This device had to be rotated mechanically into position over the FPD for high resolution imaging. Now, the new detector reported here has a high definition (Hi-Def) zoom capability along with the FPD built into one unified housing. The new detector enables rapid switching, by the operator between Hi-Def and FPD modes...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29899476/printing-ferromagnetic-domains-for-untethered-fast-transforming-soft-materials
#19
Yoonho Kim, Hyunwoo Yuk, Ruike Zhao, Shawn A Chester, Xuanhe Zhao
Soft materials capable of transforming between three-dimensional (3D) shapes in response to stimuli such as light, heat, solvent, electric and magnetic fields have applications in diverse areas such as flexible electronics1,2 , soft robotics3,4 and biomedicine5-7 . In particular, magnetic fields offer a safe and effective manipulation method for biomedical applications, which typically require remote actuation in enclosed and confined spaces8-10 . With advances in magnetic field control 11 , magnetically responsive soft materials have also evolved from embedding discrete magnets 12 or incorporating magnetic particles 13 into soft compounds to generating nonuniform magnetization profiles in polymeric sheets14,15 ...
June 2018: Nature
https://www.readbyqxmd.com/read/29899307/3d-printed-pva%C3%A2-paa-hydrogel-loaded-polycaprolactone-scaffold-for-the-delivery-of-hydrophilic-in-situ-formed-sodium-indomethacin
#20
Mershen Govender, Sunaina Indermun, Pradeep Kumar, Yahya E Choonara, Viness Pillay
3D printed polycaprolactone (PCL)-blended scaffolds have been designed, prepared, and evaluated in vitro in this study prior to the incorporation of a polyvinyl alcohol⁻polyacrylic acid (PVA⁻PAA) hydrogel for the delivery of in situ-formed sodium indomethacin. The prepared PCL⁻PVA⁻PAA scaffold is proposed as a potential structural support system for load-bearing tissue damage where inflammation is prevalent. Uniaxial strain testing of the PCL-blended scaffolds were undertaken to determine the scaffold’s resistance to strain in addition to its thermal, structural, and porosimetric properties...
June 13, 2018: Materials
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