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https://www.readbyqxmd.com/read/29656459/desktop-stereolithography-3d-printing-of-a-poly-dimethylsiloxane-based-material-with-sylgard-184-properties
#1
Nirveek Bhattacharjee, Cesar Parra-Cabrera, Yong Tae Kim, Alexandra P Kuo, Albert Folch
The advantageous physiochemical properties of poly(dimethylsiloxane) (PDMS) have made it an extremely useful material for prototyping in various technological, scientific, and clinical areas. However, PDMS molding is a manual procedure and requires tedious assembly steps, especially for 3D designs, thereby limiting its access and usability. On the other hand, automated digital manufacturing processes such as stereolithography (SL) enable true 3D design and fabrication. Here the formulation, characterization, and SL application of a 3D-printable PDMS resin (3DP-PDMS) based on commercially available PDMS-methacrylate macromers, a high-efficiency photoinitiator and a high-absorbance photosensitizer, is reported...
April 14, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29615746/mechanical-enhancement-of-core-shell-microlattices-through-high-entropy-alloy-coating
#2
James Utama Surjadi, Libo Gao, Ke Cao, Rong Fan, Yang Lu
Mechanical metamaterials such as microlattices are an emerging kind of new materials that utilize the combination of structural enhancement effect by geometrical modification and the intrinsic properties of its material constituents. Prior studies have reported the mechanical properties of ceramic or metal-coated composite lattices. However, the scalable synthesis and characterization of high-entropy alloy (HEA) as thin film coating for such cellular materials have not been studied previously. In this work, stereolithography was combined with Radio Frequency (RF) magnetron sputtering to conformally deposit a thin layer (~800 nm) of CrMnFeCoNi HEA film onto a polymer template to produce HEA-coated three-dimensional (3D) core-shell microlattice structures for the first time...
April 3, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29615324/comparing-the-accuracy-trueness-and-precision-of-models-of-fixed-dental-prostheses-fabricated-by-digital-and-conventional-workflows
#3
Ji-Young Sim, Yeon Jang, Woong-Chul Kim, Hae-Young Kim, Dong-Hwan Lee, Ji-Hwan Kim
PURPOSE: This study aimed to evaluate and compare the accuracy. METHODS: A reference model was prepared with three prepared teeth for three types of restorations: single crown, 3-unit bridge, and inlay. Stone models were fabricated from conventional impressions. Digital impressions of the reference model were created using an intraoral scanner (digital models). Physical models were fabricated using a three-dimensional (3D) printer. Reference, stone, and 3D printed models were subsequently scanned using an industrial optical scanner; files were exported in a stereolithography file format...
March 31, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29609487/3d-printing-processes-for-photocurable-polymeric-materials-technologies-materials-and-future-trends
#4
Gabriele Taormina, Corrado Sciancalepore, Massimo Messori, Federica Bondioli
The aim of this review is a faithful report of the panorama of solutions adopted to fabricate a component using vat photopolymerization (VP) processes. A general overview on additive manufacturing and on the different technologies available for polymers is given. A comparison between stereolithography and digital light processing is also presented, with attention to different aspects and to the advantages and limitations of both technologies. Afterward, a quick overview of the process parameters is given, with an emphasis on the necessities and the issues associated with the VP process...
April 1, 2018: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/29608034/simulated-transcatheter-aortic-valve-flow-implications-of-elliptical-deployment-and-under-expansion-at-the-aortic-annulus
#5
Eric Sirois, Wenbin Mao, Kewei Li, Joseph Calderan, Wei Sun
Clinical use of transcatheter aortic valves (TAVs) has been associated with abnormal deployment, including oval deployment and under-expansion when placed into calcified aortic annuli. In this study, we performed an integrated computational and experimental investigation to quantify the impact of abnormal deployment at the aortic annulus on TAV hemodynamics. A size 23 mm generic TAV computational model, developed and published previously, was subjected to elliptical deployment at the annulus with eccentricity levels up to 0...
April 2, 2018: Artificial Organs
https://www.readbyqxmd.com/read/29607159/application-of-3d-printing-in-the-surgical-planning-of-hypertrophic-obstructive-cardiomyopathy-and-physician-patient-communication-a-preliminary-study
#6
Hong-Chang Guo, Yang Wang, Jiang Dai, Chang-Wei Ren, Jin-Hua Li, Yong-Qiang Lai
Background: The aim of this study was to evaluate the effect of 3-dimensional (3D) printing in treatment of hypertrophic obstructive cardiomyopathy (HOCM) and its roles in doctor-patient communication. Methods: 3D-printed models were constructed preoperatively and postoperatively in seven HOCM patients received surgical treatment. Based on multi-slice computed tomography (CT) images, regions of disorder were segmented using the Mimics 19.0 software (Materialise, Leuven, Belgium)...
February 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29581806/accuracy-of-three-dimensional-planning-in-surgery-first-orthognathic-surgery-planning-versus-outcome
#7
Ngoc Hieu Tran, Syrina Tantidhnazet, Somchart Raocharernporn, Sirichai Kiattavornchareon, Verasak Pairuchvej, Natthamet Wongsirichat
Background: The benefit of computer-assisted planning in orthognathic surgery (OGS) has been extensively documented over the last decade. This study aimed to evaluate the accuracy of three-dimensional (3D) virtual planning in surgery-first OGS. Methods: Fifteen patients with skeletal class III malocclusion who underwent bimaxillary OGS with surgery-first approach were included. A composite skull model was reconstructed using data from cone-beam computed tomography and stereolithography from a scanned dental cast...
May 2018: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/29573485/high-speed-3d-printing-of-millimeter-size-customized-aspheric-imaging-lenses-with-sub-7-nm-surface-roughness
#8
Xiangfan Chen, Wenzhong Liu, Biqin Dong, Jongwoo Lee, Henry Oliver T Ware, Hao F Zhang, Cheng Sun
Advancements in three-dimensional (3D) printing technology have the potential to transform the manufacture of customized optical elements, which today relies heavily on time-consuming and costly polishing and grinding processes. However the inherent speed-accuracy trade-off seriously constrains the practical applications of 3D-printing technology in the optical realm. In addressing this issue, here, a new method featuring a significantly faster fabrication speed, at 24.54 mm3 h-1 , without compromising the fabrication accuracy required to 3D-print customized optical components is reported...
March 24, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29567165/3d-printed-lab-on-valve-for-fluorescent-determination-of-cadmium-and-lead-in-water
#9
Elodie Mattio, Fabien Robert-Peillard, Laurent Vassalo, Catherine Branger, André Margaillan, Christophe Brach-Papa, Joël Knoery, Jean-Luc Boudenne, Bruno Coulomb
In recent years, the development of 3D printing in flow analysis has allowed the creation of new systems with various applications. Up to now, 3D printing was mainly used for the manufacture of small units such as flow detection cells, preconcentration units or mixing systems. In the present study, a new 3D printed lab-on-valve system was developed to selectively quantify lead and cadmium in water. Different technologies were compared for lab-on-valve 3D printing. Printed test units have shown that stereolithography or digital light processing are satisfactory techniques for creating complex lab-on-valve units...
June 1, 2018: Talanta
https://www.readbyqxmd.com/read/29563361/dental-implant-treatment-with-computer-assisted-surgery-for-bilateral-agenesis-of-maxillary-lateral-incisors-a-case-report
#10
Hodaka Sasaki, Tomoki Hirano, Syuntaro Nomoto, Yasushi Nishii, Yasutomo Yajima
Here, we report a case of dental implant treatment involving computer-assisted surgery for bilateral agenesis of the maxillary lateral incisors. The patient was a 39-year-old woman with the chief complaint of functional and esthetic disturbance due to maxillary and mandibular malocclusion. The treatment plan comprised non-extraction comprehensive orthodontic treatment and prosthodontic treatment for space due to the absence of bilateral maxillary lateral incisors. A preliminary examination revealed that the mesiodistal spaces left by the absent bilateral maxillary lateral incisors were too narrow for implant placement (right, 5...
2018: Bulletin of Tokyo Dental College
https://www.readbyqxmd.com/read/29555437/3d-printed-microneedles-for-insulin-skin-delivery
#11
Cristiane Patricia Pissinato Pere, Sophia N Economidou, Gurprit Lall, Clémentine Ziraud, Joshua S Boateng, Bruce D Alexander, Dimitrios A Lamprou, Dennis Douroumis
In this study, polymeric microneedle patches were fabricated by stereolithography, a 3D printing technique, for the transdermal delivery of insulin. A biocompatible resin was photopolymerized to build pyramid and cone microneedle designs followed by inkjet print coating of insulin formulations., trehalose and xylitol were used as drug carriers with the aim to preserve insulin integrity and stability but also facilitate rapid release rates. Circular dichroism and Raman analysis demonstrated that all carriers maintained the native form of insulin with xylitol presenting the best performance...
March 16, 2018: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29554909/pelvic-modelling-and-the-comparison-between-plate-position-for-double-pelvic-osteotomy-using-artificial-cancellous-bone-and-finite-element-analysis
#12
William McCartney, Bryan MacDonald, Ciprian Andrei Ober, Rubén Lostado-Lorza, Fátima Somovilla Gómez
BACKGROUND: Finite element analysis was used to compare fixation methods for double pelvic osteotomy (DPO). Using 3D scanning a stereolithography (stl) image was produced of a canine pelvis and this was subsequently refined in computer aided design (CAD). Using the CAD files, the images were imported in MSC Marc software to produce a working finite element (FE) model with 3 dimensional tetrahedral elements with linear shaped functions. The dimensions of a precontoured pelvic osteotomy plate with eight screws and a twisted seven screw straight plate were used to build the 2 fixations implants for the FE models...
March 20, 2018: BMC Veterinary Research
https://www.readbyqxmd.com/read/29509023/accuracy-of-three-dimensional-dental-resin-models-created-by-fused-deposition-modeling-stereolithography-and-polyjet-prototype-technologies-a-comparative-study
#13
Raymund E Rebong, Kelton T Stewart, Achint Utreja, Ahmed A Ghoneima
OBJECTIVES: The aim of this study was to assess the dimensional accuracy of fused deposition modeling (FDM)-, Polyjet-, and stereolithography (SLA)-produced models by comparing them to traditional plaster casts. MATERIALS AND METHODS: A total of 12 maxillary and mandibular posttreatment orthodontic plaster casts were selected from the archives of the Orthodontic Department at the Indiana University School of Dentistry. Plaster models were scanned, saved as stereolithography files, and printed as physical models using three different three-dimensional (3D) printers: Makerbot Replicator (FDM), 3D Systems SLA 6000 (SLA), and Objet Eden500V (Polyjet)...
March 6, 2018: Angle Orthodontist
https://www.readbyqxmd.com/read/29486312/feasibility-of-clinician-facilitated-3d-printing-of-synthetic-cranioplasty-flaps
#14
Sandip S Panesar, Joao Tiago A Belo, Rhett N D'Souza
OBJECTIVES: Integration of 3D printing and stereolithography into clinical practice is in its primacy and concepts may be esoteric to the practicing neurosurgeon. Currently, creation of 3D printed implants involves recruitment of offsite 3rd parties. We explored a range of 3D scanning and stereolithographic techniques to create patient-specific synthetic implants using an onsite, clinician-facilitated approach. METHODS: We simulated bilateral craniectomies in a single cadaveric specimen...
February 24, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29486052/endodontic-applications-of-3d-printing
#15
REVIEW
J Anderson, J Wealleans, J Ray
Computer-aided design (CAD) and computer-aided manufacturing (CAM) technologies can leverage cone beam computed tomography (CBCT) data for production of objects used in surgical and nonsurgical endodontics and in educational settings. The aim of this article is to review all current applications of 3D printing in endodontics and to speculate upon future directions for research and clinical use within the specialty. A literature search of PubMed, Ovid and Scopus was conducted using the following terms: stereolithography, 3D printing, computer aided rapid prototyping, surgical guide, guided endodontic surgery, guided endodontic access, additive manufacturing, rapid prototyping, autotransplantation rapid prototyping, computer aided design (CAD), computer aided manufacturing (CAM)...
February 27, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29466922/rabbit-calvarial-defect-model-for-customized-3d-printed-bone-grafts
#16
Kang-Gon Lee, Kang-Sik Lee, Yu-Jeoung Kang, Jong-Hyun Hwang, Se-Hwan Lee, Sang-Hyug Park, Yongdoo Park, Young-Sam Cho, Bu-Kyu Lee
Bone graft materials are commonly used to regenerate various bone defects, but their application is often limited because of the complex defect shape in various clinical conditions. Hence, customized bone grafts using three-dimensional (3D) printing techniques have been developed. However, conventional simple bone defect models are limited for evaluating the benefits and manufacturing accuracy of 3D-printed customized bone grafts. Thus, the aim of the present study was to develop a complex-shaped bone defect model...
February 21, 2018: Tissue Engineering. Part C, Methods
https://www.readbyqxmd.com/read/29461046/3d-bioprinted-dopamine-based-matrix-for-promoting-neural-regeneration
#17
Xuan Zhou, Haitao Cui, Margaret Nowicki, Shida Miao, Se-Jun Lee, Fahed Masood, Brent T Harris, Lijie Grace Zhang
Central nerve repair and regeneration remain challenging problems worldwide largely because of the extremely weak inherent regenerative capacity and accompanying fibrosis of native nerves. Inadequate solutions to unmet needs for clinical therapeutics encourage the development of novel strategies to promote nerve regeneration. Recently, 3D bioprinting techniques, as one of a set of valuable tissue engineering technologies, have shown great promise toward fabricating complex and customizable artificial tissue scaffolds...
February 20, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29460063/virtual-modeling-stereolithography-and-intraoperative-ct-guidance-for-the-optimization-of-sagittal-synostosis-reconstruction-a-technical-note
#18
Andrew J Kobets, Adam Ammar, Jonathan Nakhla, Aleka Scoco, Rani Nasser, James T Goodrich, Rick Abbott
INTRODUCTION: Sagittal synostosis affects 1 in 1000 live births and may result in increased intracranial pressure, hindrance of normal neural development, and cosmetic deformity due to scaphocephaly. Historically, several approaches have been utilized for surgical correction and recently, computed tomography (CT)-guided reconstruction procedures are increasingly used. In this report, the authors describe the use of a CT-derived virtual and stereolithographic (3D printed) craniofacial models, which are used to guide intraoperative bone placement, and intraoperative CT guidance for confirmation of bone placement, to ensure the accuracy of surgical correction of scaphocephaly, as demonstrated to parents...
February 19, 2018: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29446757/3d-bioprinting-mesenchymal-stem-cell-laden-construct-with-core-shell-nanospheres-for-cartilage-tissue-engineering
#19
Wei Zhu, Haitao Cui, Benchaa Boualam, Fahed Masood, Erin Flynn, Raj Rao, Zhiyong Zhang, Lijie Grace Zhang
Cartilage tissue is prone to degradation and has little capacity for self-healing due to its avascularity. Tissue engineering, which provides artificial scaffolds to repair injured tissues, is a novel and promising strategy for cartilage repair. 3D bioprinting offers even greater potential for repairing degenerative tissue by simultaneously integrating living cells, biomaterials, and biological cues to provide a customized scaffold. With regard to cell selection, mesenchymal stem cells (MSCs) hold great capacity for differentiating into a variety of cell types, including chondrocytes, and could therefore be utilized as a cartilage cell source in 3D bioprinting...
February 15, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29419675/the-precision-and-reliability-evaluation-of-3-dimensional-printed-damaged-bone-and-prosthesis-models-by-stereo-lithography-appearance
#20
Yun Zou, Qing Han, Xisheng Weng, Yongwei Zou, Yingying Yang, Kesong Zhang, Kerong Yang, Xiaolin Xu, Chenyu Wang, Yanguo Qin, Jincheng Wang
Recently, clinical application of 3D printed model was increasing. However, there was no systemic study for confirming the precision and reliability of 3D printed model. Some senior clinical doctors mistrusted its reliability in clinical application. The purpose of this study was to evaluate the precision and reliability of stereolithography appearance (SLA) 3D printed model.Some related parameters were selected to research the reliability of SLA 3D printed model. The computed tomography (CT) data of bone/prosthesis and model were collected and 3D reconstructed...
February 2018: Medicine (Baltimore)
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