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https://www.readbyqxmd.com/read/29159920/quality-assurance-for-a-six-degrees-of-freedom-table-using-a-3d-printed-phantom
#1
Kyle Woods, Ahmet S Ayan, Jeffrey Woollard, Nilendu Gupta
PURPOSE: To establish a streamlined end-to-end test of a 6 degrees-of-freedom (6DoF) robotic table using a 3D printed phantom for periodic quality assurance. METHODS: A 3D printed phantom was fabricated with translational and rotational offsets and an imbedded central ball-bearing (BB). The phantom underwent each step of the radiation therapy process: CT simulation in a straight orientation, plan generation using the treatment planning software, setup to offset marks at the linac, registration and corrected 6DoF table adjustments via hidden target test, delivery of a Winston-Lutz test to the BB, and verification of table positioning via field and laser lights...
November 21, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29158165/cardiac-3d-printing-for-better-understanding-of-congenital-heart-disease
#2
Khaled Hadeed, Philippe Acar, Yves Dulac, Fabio Cuttone, Xavier Alacoque, Clément Karsenty
No abstract text is available yet for this article.
November 17, 2017: Archives of Cardiovascular Diseases
https://www.readbyqxmd.com/read/29156138/plasmonic-sensing-with-3d-printed-optics
#3
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 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29155941/new-graft-sizing-rings-for-aortic-valve-reimplantation-procedures
#4
Matija Jelenc, Blaž Jelenc, Ivan Kneževic, Tomislav Klokocovnik
OBJECTIVES: The objective was to design sizing rings that would enable proper sizing of the graft in reimplantation procedures and to perform leaflet repair before graft implantation. METHODS: The rings were designed in Autodesk Fusion 360 (San Rafael, CA, USA) and 3D printed using a commercial online 3D printing service. We designed incomplete rings with a low profile and complete rings with a high profile. The complete rings are best suited for reimplantation procedures, whereas low profile C rings are intended for isolated aortic valve repair, where the ascending aorta is not transected...
August 11, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29155730/long-term-live-imaging-device-for-improved-experimental-manipulation-of-zebrafish-larvae
#5
Kayla Huemer, Jayne M Squirrell, Robert Swader, Kirsten Pelkey, Danny C LeBert, Anna Huttenlocher, Kevin W Eliceiri
The zebrafish larva is an important model organism for both developmental biology and wound healing. Further, the zebrafish larva is a valuable system for live high-resolution microscopic imaging of dynamic biological phenomena in space and time with cellular resolution. However, the traditional method of agarose encapsulation for live imaging can impede larval development and tissue regrowth. Therefore, this manuscript describes the zWEDGI (zebrafish Wounding and Entrapment Device for Growth and Imaging), which was designed and fabricated as a functionally compartmentalized device to orient larvae for high-resolution microscopy while permitting caudal fin transection within the device and subsequent unrestrained tail development and re-growth...
October 27, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29155411/porosity-effect-of-3d-printed-polycaprolactone-membranes-on-calvarial-defect-model-for-guided-bone-regeneration
#6
Jin-Hyung Shim, Jae-Hyang Jeong, Joo-Yun Won, Ji-Hyeon Bae, Geunseon Ahn, Hojun Jeon, Won-Soo Yun, Eun-Bin Bae, Jae-Won Choi, So-Hyoun Lee, Chang-Mo Jeong, Hoyun Chung, Jung-Bo Huh
The appropriate porosity and pore size of barrier membrane were associated with the transportation of biomolecules required for new bone formation and angiogenesis. In this study, we fabricated 3D-printed resorbable polycaprolactone (PCL) membranes with different porosities (30%, 50%, and 70%) to evaluate the effective pore size for guided bone regeneration (GBR) membranes. To analyze mechanical properties and cytocompatibility, PCL membranes prepared using extrusion-based 3D printing technology were compared in dry and wet conditions and tested in vitro...
November 20, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29152500/application-of-3d-technology-and-printing-for-femoral-derotation-osteotomy-case-and-technical-report
#7
Nicolás Fiz, Diego Delgado, Xabier Sánchez, Pello Sánchez, Ane Miren Bilbao, Jaime Oraa, Mikel Sánchez
In some surgical techniques like femoral derotation osteotomy, accuracy is a key factor that often is not optimal because of the lack of appropriate technology. 3D printing is emerging in many professional areas and its use in the medical field may enhance the results of certain surgeries. This case describes a patient who underwent an intramedullary nail fixation to treat a femoral shaft fracture. After nine months, the patient presented hip pain and "in toe" walking caused by a malrotation produced during the surgery...
October 2017: Annals of Translational Medicine
https://www.readbyqxmd.com/read/29152451/comparison-of-different-soft-grippers-for-lunch-box-packaging
#8
Zhongkui Wang, Mingzhu Zhu, Sadao Kawamura, Shinichi Hirai
Automating the lunch box packaging is a challenging task due to the high deformability and large individual differences in shape and physical property of food materials. Soft robotic grippers showed potentials to perform such tasks. In this paper, we presented four pneumatic soft actuators made of different materials and different fabrication methods and compared their performances through a series of tests. We found that the actuators fabricated by 3D printing showed better linearity and less individual differences, but showed low durability compared to actuators fabricated by traditional casting process...
2017: Robotics and Biomimetics
https://www.readbyqxmd.com/read/29151703/3d-printed-fistula-stent-designed-for-management-of-enterocutaneous-fistula-an-advanced-strategy
#9
Jin-Jian Huang, Jian-An Ren, Ge-Fei Wang, Zong-An Li, Xiu-Wen Wu, Hua-Jian Ren, Song Liu
Enterocutaneous fistulas (ECFs) are great challenges during the open abdomen. The loss of digestive juice, water-electrolyte imbalance and malnutrition are intractable issues during management of ECF. Techniques such as "fistula patch" and vacuum-assisted closure therapy have been applied to prevent contamination of open abdominal wounds by intestinal fistula drainage. However, failures are encountered due to high-output fistula and anatomical complexity. Here, we report 3D-printed patient-personalized fistula stent for ECF treatment based on 3D reconstruction of the fistula image...
November 7, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29150131/a-3d-printed-guide-for-lateral-approach-sinus-grafting-a-dental-technique
#10
Brian J Goodacre, Rajesh S Swamidass, Jaime Lozada, Aladdin Al-Ardah, Erik Sahl
Lateral approach sinus grafting has become a routine and predictable surgical method of augmenting the pneumatized sinus for implant placement. Outlining the lateral window access can be a challenging task for the clinician to envision and execute. Improper extension and access to the maxillary sinus can prevent proper placement of graft materials and lead to complications. The purpose of this report was to demonstrate a technique that will allow the precise planning of the lateral approach using radiographic information and 3-dimensional (3D) software to 3D-print a surgical guide...
November 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/29149508/implementing-quantum-search-algorithm-with-metamaterials
#11
Weixuan Zhang, Kaiyang Cheng, Chao Wu, Yi Wang, Hongqiang Li, Xiangdong Zhang
Metamaterials, artificially structured electromagnetic (EM) materials, have enabled the realization of many unconventional EM properties not found in nature, such as negative refractive index, magnetic response, invisibility cloaking, and so on. Based on these man-made materials with novel EM properties, various devices are designed and realized. However, quantum analog devices based on metamaterials have not been achieved so far. Here, metamaterials are designed and printed to perform quantum search algorithm...
November 17, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29148982/a-dentin-derived-hydrogel-bioink-for-3d-printing-of-cell-laden-scaffolds-for-regenerative-dentistry
#12
Avathamsa Athirasala, Anthony Tahayeri, Greeshma Thrivikraman, Cristiane Miranda Franca, Nelson Monteiro, Victor Tran, Jack Ferracane, Luiz Bertassoni
Recent studies in tissue engineering have adopted extracellular matrix (ECM) derived scaffolds as natural and cytocompatible microenvironments for tissue regeneration. The dentin matrix, specifically, has been shown to be associated with a host of soluble and insoluble signaling molecules that can promote odontogenesis. Here, we have developed a novel bioink, blending printable alginate (3% w/v) hydrogels with the soluble and insoluble fractions of the dentin matrix. We have optimized the printing parameters and the concentrations of the individual components of the bioink for print accuracy, cell viability and odontogenic potential...
November 17, 2017: Biofabrication
https://www.readbyqxmd.com/read/29148712/constructing-repairable-meta-structures-of-ultra-broadband-electromagnetic-absorption-from-3d-printed-patterned-shells
#13
Wei-Li Song, Zhili Zhou, Lichen Wang, Xiao-Dong Cheng, Mingji Chen, Rujie He, Hao-Sen Chen, Yazheng Yang, Daining Fang
Ultra-broadband electromagnetic absorption materials and structures are increasingly attractive for their critical role in competing to the advanced broadband electromagnetic detective systems. Mechanically soft and weak wax-based materials composites are known to be insufficient to serve for practical electromagnetic absorption applications. To break through such barriers, here we developed an innovative strategy to enable the wax-based composites as robust and repairable meta-structures by employing a 3D printed polymeric patterned shell...
November 17, 2017: ACS Applied Materials & Interfaces
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
#14
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/29147690/physiological-ph-dependent-gelation-for-3d-printing-based-on-the-phase-separation-of-gelatin-and-oxidized-dextran
#15
Zengmin Du, Ningfeng Li, Yujie Hua, Yong Shi, Chunyan Bao, Hongbo Zhang, Yi Yang, Qiuning Lin, Linyong Zhu
An extrudable hydrogel with a tunable gelation time under physiological pH ranges based on the phase separation of gelatin and oxidized dextran was demonstrated. We envision that the easy handing properties of this hydrogel combined with thermosensitive physical gelation and postponed chemical reinforcing will provide a platform for 3D bioprinting applications.
November 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29146240/channelled-tablets-an-innovative-approach-to-accelerating-drug-release-from-3d-printed-tablets
#16
Muzna Sadia, Basel Arafat, Waqar Ahmed, Robert E Forbes, Mohamed A Alhnan
Conventional immediate release dosage forms involve compressing the powder with a disintegrating agent that enables rapid disintegration and dissolution upon oral ingestion. Among 3D printing technologies, the fused deposition modelling (FDM) 3D printing technique has considerable potential for patient-specific dosage form. However, the use of FDM 3D printing in tablet manufacturing requires large portion of polymer, which slows down drug release through erosion and diffusion mechanisms. In this study, we demonstrate for the first time the use of a novel design approach of caplets with perforating channels to accelerate drug release from 3D printed tablets...
November 13, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29145725/effectiveness-of-3d-printed-models-in-obtaining-informed-consent-to-complex-aortic-surgery-in-25-patients
#17
Enrico M Marone, Luigi F Rinaldi, Andrea Pietrabissa, Angelo Argenteri
No abstract text is available yet for this article.
November 16, 2017: Journal of Cardiovascular Surgery
https://www.readbyqxmd.com/read/29144584/3d-printed-anchoring-sutures-for-permanent-shaping-of-tissues
#18
Wei Wei, Yuxiao Li, Huazhe Yang, Reza Nassab, Fatemeh Shahriyari, Ali Akpek, Xiaofei Guan, Yanhui Liu, Shahrouz Taranejoo, Ali Tamayol, Yu Shrike Zhang, Ali Khademhosseini, Hae Lin Jang
Sutures are one of the most widely used devices for adhering separated tissues after injury or surgery. However, most sutures require knotting, which can create a risk of inflammation, and can act as mechanically weak points that often result in breakage and slipping. Here, an anchoring suture is presented with a design that facilitates its propagation parallel to the suturing direction, while maximizing its resistive force against the opposite direction of external force to lock its position in tissues. Different microstructures of suture anchors are systematically designed using orthogonal arrays, and selected based on shape factors associated with mechanical strength...
November 16, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29144426/experimental-exploration-of-metal-cable-as-reinforcement-in-3d-printed-concrete
#19
Freek P Bos, Zeeshan Y Ahmed, Evgeniy R Jutinov, Theo A M Salet
The Material Deposition Method (MDM) is enjoying increasing attention as an additive method to create concrete mortar structures characterised by a high degree of form-freedom, a lack of geometrical repetition, and automated construction. Several small-scale structures have been realised around the world, or are under preparation. However, the nature of this construction method is unsuitable for conventional reinforcement methods to achieve ductile failure behaviour. Sometimes, this is solved by combining printing with conventional casting and reinforcing techniques...
November 16, 2017: Materials
https://www.readbyqxmd.com/read/29143451/using-intraoral-scanning-technology-for-three-dimensional-printing-of-kennedy-class-i-removable-partial-denture-metal-framework-a-clinical-report
#20
Feng Hu, Zhenhua Pei, Ying Wen
Removable partial dentures (RPDs) are used to restore missing teeth and are traditionally fabricated using the lost-wax casting technique. The casting process is arduous, time-consuming, and requires a skilled technician. The development of intraoral scanning and 3D printing technology has made rapid prototyping of the RPD more achievable. This article reports a completed case of direct fabrication of a maxillary RPD metal framework (Kennedy Class I) using intraoral scanning and 3D printing techniques. Acceptable fit and satisfactory clinical outcome were demonstrated...
November 16, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
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