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https://www.readbyqxmd.com/read/29772034/three-dimensional-analysis-of-internal-adaptations-of-crowns-cast-from-resin-patterns-fabricated-using-computer-aided-design-computer-assisted-manufacturing-technologies
#1
Yushu Liu, Hongqiang Ye, Yong Wang, Yijao Zhao, Yuchun Sun, Yongsheng Zhou
PURPOSE: To evaluate the internal adaptations of cast crowns made from resin patterns produced using three different computer-aided design/computer-assisted manufacturing technologies. MATERIALS AND METHODS: A full-crown abutment made of zirconia was digitized using an intraoral scanner, and the design of the crown was finished on the digital model. Resin patterns were fabricated using a fused deposition modeling (FDM) 3D printer (LT group), a digital light projection (DLP) 3D printer (EV group), or a five-axis milling machine (ZT group)...
May 17, 2018: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/29770160/active-tube-shaped-actuator-with-embedded-square-rod-shaped-ionic-polymer-metal-composites-for-robotic-assisted-manipulation
#2
Yanjie Wang, Jiayu Liu, Denglin Zhu, Hualing Chen
This paper reports a new technique involving the design, fabrication, and characterization of an ionic polymer-metal composite- (IPMC-) embedded active tube, which can achieve multidegree-of-freedom (MODF) bending motions desirable in many applications, such as a manipulator and an active catheter. However, traditional strip-type IPMC actuators are limited in only being able to generate 1-dimensional bending motion. So, in this paper, we try to develop an approach which involves molding or integrating rod-shaped IPMC actuators into a soft silicone rubber structure to create an active tube...
2018: Applied Bionics and Biomechanics
https://www.readbyqxmd.com/read/29752120/effects-of-printing-induced-interfaces-on-localized-strain-within-3d-printed-hydrogel-structures
#3
Kyle Christensen, Brian Davis, Yifei Jin, Yong Huang
Additive manufacturing, or 3D printing, is a promising approach for the fabrication of biological structures for regenerative medicine applications using tissue-like materials such as hydrogels. Herein, inkjet printing is implemented as a model droplet-based 3D printing technology for which interfaces have been shown to form between printed lines within printed layers of hydrogel structures. Experimental samples with interfaces in two orientations are fabricated by inkjet printing and control samples with and without interfaces are fabricated by extrusion printing and casting, respectively...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29749882/low-cost-endoscopic-third-ventriculostomy-simulator-with-mimetic-endoscope
#4
Richard Justin Garling, Xin Jin, Jianzhong Yang, Ahmad H Khasawneh, Carolyn Anne Harris
OBJECTIVE Hydrocephalus affects approximately 1 in 500 people in the US, yet ventricular shunting, the gold standard of treatment, has a nearly 85% failure rate. Endoscopic third ventriculostomy (ETV) is an alternative surgical approach for a specific subset of hydrocephalic patients, but can be limited by the inability of neurosurgical residents to practice prior to patient contact. The goal of this study was to create an affordable ETV model and endoscope for resident training. METHODS Open-source software was used to isolate the skull and brain from the CT and MR images of a 2-year-old boy with hydrocephalus...
May 11, 2018: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29735606/allele-specific-control-of-replication-timing-and-genome-organization-during-development
#5
Juan Carlos Rivera-Mulia, Andrew Dimond, Daniel Vera, Claudia Trevilla-Garcia, Takayo Sasaki, Jared Zimmerman, Catherine Dupont, Joost Gribnau, Peter Fraser, David M Gilbert
DNA replication occurs in a defined temporal order known as the replication-timing (RT) program. RT is regulated during development in discrete chromosomal units, coordinated with transcriptional activity and 3D genome organization. Here, we derived distinct cell types from F1 hybrid musculus X castaneus mouse crosses and exploited the high single nucleotide polymorphism (SNP) density to characterize allelic differences in RT (Repli-seq), genome organization (Hi-C and promoter-capture Hi-C), gene expression (total nuclear RNA-seq) and chromatin accessibility (ATAC-seq)...
May 7, 2018: Genome Research
https://www.readbyqxmd.com/read/29726936/association-between-3d-palatal-morphology-and-upper-arch-dimensions-in-buccally-displaced-maxillary-canines-early-in-mixed-dentition
#6
Maria Bizzarro, Chiara Generali, Saverio Maietta, Massimo Martorelli, Martina Ferrillo, Carlos Flores-Mir, Letizia Perillo
Objectives: To evaluate the association between maxillary dental arch transverse dimensions, palatal depths, palatal area and volume with buccally displaced canine (BDC) in mixed dentition subjects when compared to non-BDC subjects using laser scanner 3D technology. Materials and methods: Sixty Caucasian subjects, 8-11 years of age (mean, 9.26 ± 1.48 years), were included. In each group (BDC and non-BDC) 30 children were matched. Digital dental casts were obtained using a 3 Shape D700 laser scanner...
May 3, 2018: European Journal of Orthodontics
https://www.readbyqxmd.com/read/29725867/an-oxygen-plasma-treated-poly-dimethylsiloxane-bioscaffold-coated-with-polydopamine-for-stem-cell-therapy
#7
Mehdi Razavi, Avnesh S Thakor
In this study, 3D macroporous bioscaffolds were developed from poly(dimethylsiloxane) (PDMS) which is inert, biocompatible, non-biodegradable, retrievable and easily manufactured at low cost. PDMS bioscaffolds were synthesized using a solvent casting and particulate leaching (SCPL) technique and exhibited a macroporous interconnected architecture with 86 ± 3% porosity and 300 ± 100 µm pore size. As PDMS intrinsically has a hydrophobic surface, mainly due to the existence of methyl groups, its surface was modified by oxygen plasma treatment which, in turn, enabled us to apply a novel polydopamine coating onto the surface of the bioscaffold...
May 3, 2018: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29693258/microvascular-anatomy-of-the-brain-of-the-adult-pipid-frog-xenopus-laevis-daudin-a-scanning-electron-microscopic-study-of-vascular-corrosion-casts
#8
Alois Lametschwandtner, Bernd Minnich
To demonstrate the 3D microvascular anatomy of the brain of the model organism Xenopus laevis Daudin scanning electron microscopy of vascular corrosion casts was correlated with light microscopy of stained 7 µm thick serial tissues sections. Results showed that supplying arteries descended from the leptomeningeal surface without remarkable branchings straight to the subventricular zone where they branched and capillarized. Capillaries showed few H- and/or Y-shaped anastomoses during their centrifugal course toward the leptomeningeal surface where they drained into cerebral venules and veins...
April 25, 2018: Journal of Morphology
https://www.readbyqxmd.com/read/29692562/comparison-of-marginal-and-internal-adaptation-of-copings-fabricated-from-three-different-fabrication-techniques-an-in-vitro-study
#9
Aman Arora, Avneet Yadav, Viram Upadhyaya, Prachi Jain, Mrinalini Verma
Aim: The purpose of this study was to compare the marginal and internal adaptation of cobalt-chromium (Co-Cr) copings fabricated from conventional wax pattern, three-dimensional (3D)-printed resin pattern, and laser sintering technique. Materials and Methods: A total of thirty copings were made, out of which ten copings were made from 3D-printed resin pattern (Group A), ten from inlay wax pattern (Group B), and ten copings were obtained from direct metal laser sintering (DMLS) technique (Group C)...
April 2018: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/29689294/the-facial-effects-of-tooth-wear-rehabilitation-as-measured-by-3d-stereophotogrammetry
#10
Bernadette A M M Sterenborg, Thomas J J Maal, Rinaldo Vreeken, Bas A C Loomans, Marie-Charlotte D N J M Huysmans
OBJECTIVE: Evaluate the effect of a full rehabilitation, including an increase of vertical dimension of occlusion (VDO), in patients with severe tooth wear on changes in facial appearance. METHODS: Patients with severe tooth wear were restoratively treated using direct composite restorations, including an increase of the VDO. Before and one month after treatment 3D stereophotographs were taken and facial changes were measured with the use of 3D cephalometric landmarks...
April 21, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29687097/a-report-on-a-diagnostic-digital-workflow-for-esthetic-dental-rehabilitation-using-additive-manufacturing-technologies
#11
Marta Revilla-León, José Luis Sánchez-Rubio, Adriana Besné-Torre, Mutlu Özcan
The digital workflow - from the intraoral scanning, through the CAD design of the facially generated diagnostic digital wax-up, to the CAD-designed and 3D-printed silicone index with the diagnostic mock-up - provides a new approach that avoids the conventional manufacturing of casts. The development of the process requires a synchronized workflow and good communication between the dental technician, prosthodontist, and patient. This report describes a protocol for the diagnostic digital sequence for the treatment planning of an esthetic rehabilitation...
2018: International Journal of Esthetic Dentistry
https://www.readbyqxmd.com/read/29665336/degradable-3d-printed-hydrogels-based-on-star-shaped-copolypeptides
#12
Robert Murphy, David P Walsh, Charles A Hamilton, Sally-Ann Cryan, Marc In Het Panhuis, Andreas Heise
We present a star copolypeptide based hydrogel ink capable of structural microfabrication using 3D extrusion printing. The material comprises an amphiphilic block copolymer structure of poly(benzyl-L-glutamate-b-L-valine), which spontaneously form hydrogels through hydrophobic interaction. The chemical design allows the bulk phase of the hydrogel to remain intact after application of shear due to its self-recovery behavior. It is demonstrated that the composition of the materials is ideally suited for 3D printing; with scaffolds capable of maintaining structural cohesion after extrusion...
April 17, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29660487/monitoring-the-progression-of-erosive-tooth-wear-etw-using-bewe-index-in-casts-and-their-3d-images-a-retrospective-longitudinal-study
#13
Francisca Marro, Liesa De Lat, Luc Martens, Wolfgang Jacquet, Peter Bottenberg
OBJECTIVE: To determine if the Basic erosive tooth wear index (BEWE index) is able to assess and monitor ETW changes in two consecutive cast models, and detect methodological differences when using the corresponding 3D image replicas. METHODS: A total of 480 pre-treatment and 2-year post-treatment orthodontic models (n = 240 cast models and n = 240 3D image replicas) from 120 adolescents treated between 2002-2013 at the Gent Dental Clinic, Belgium, were scored using the BEWE index...
April 13, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29659132/3d-extrusion-printing-induces-polymer-molecule-alignment-and-cell-organization-within-engineered-cartilage
#14
Ting Guo, Julia P Ringel, Casey G Lim, Laura G Bracaglia, Maeesha Noshin, Hannah B Baker, Douglas A Powell, John P Fisher
Proper cell-material interactions are critical to remain cell function and thus successful tissue regeneration. Many fabrication processes have been developed to create microenvironments to control cell attachment and organization on a 3D scaffold. However, these approaches often involve heavy engineering and only the surface layer can be patterned. We found that 3D extrusion based printing at high temperature and pressure will result an aligned effect on the polymer molecules, and this molecular arrangement will further induce the cell alignment and different differentiation capacities...
April 16, 2018: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29658935/fabrication-of-custom-agarose-wells-for-cell-seeding-and-tissue-ring-self-assembly-using-3d-printed-molds
#15
Hannah A Strobel, Elizabeth L Calamari, Brittany Alphonse, Tracy A Hookway, Marsha W Rolle
Engineered tissues are being used clinically for tissue repair and replacement, and are being developed as tools for drug screening and human disease modeling. Self-assembled tissues offer advantages over scaffold-based tissue engineering, such as enhanced matrix deposition, strength, and function. However, there are few available methods for fabricating 3D tissues without seeding cells on or within a supporting scaffold. Previously, we developed a system for fabricating self-assembled tissue rings by seeding cells into non-adhesive agarose wells...
April 2, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29655527/the-smiling-scan-technique-facially-driven-guided-surgery-and-prosthetics
#16
Alessandro Pozzi, Lorenzo Arcuri, Peter K Moy
PURPOSE: To introduce a proof of concept technique and new integrated workflow to optimize the functional and esthetic outcome of the implant-supported restorations by means of a 3-dimensional (3D) facially-driven, digital assisted treatment plan. METHODS: The Smiling Scan technique permits the creation of a virtual dental patient (VDP) showing a broad smile under static conditions. The patient is exposed to a cone beam computed tomography scan (CBCT), displaying a broad smile for the duration of the examination...
April 11, 2018: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/29652538/novel-3-d-analysis-for-the-assessment-of-cleft-dimensions-on-digital-models-of-infants-with-unilateral-cleft-lip-and-palate
#17
Susanna Botticelli, Thomas Klit Pedersen, Annelise Küseler, Sven Erik Nørholt, Paolo M Cattaneo
OBJECTIVE: To present a 3-D standardized analysis of cleft dimensions. MATERIALS: Thirty-one plaster casts of unilateral cleft lip and palate (UCLP) infants were laser scanned. Landmarks and coordinate system were defined. Linear distances and surfaces were measured, and the ratio between cleft and palatal area was calculated (3-D infant cleft severity ratio [3D ICSR]). The digitally measured areas were compared with silicone membranes, adapted to the plaster casts, and analyzed by optic microscopy...
January 1, 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29651222/toward-3d-printed-hydrogen-storage-materials-made-with-abs-mof-composites
#18
Megan N Channell, Makfir Sefa, James A Fedchak, Julia Scherschligt, Michael Bible, Bharath Natarajan, Nikolai N Klimov, Abigail E Miller, Zeeshan Ahmed, Matthew R Hartings
The push to advance efficient, renewable, and clean energy sources has brought with it an effort to generate materials that are capable of storing hydrogen. Metal-organic framework materials (MOFs) have been the focus of many such studies as they are categorized for their large internal surface areas. We have addressed one of the major shortcomings of MOFs (their processibility) by creating and 3D printing a composite of acrylonitrile butadiene styrene (ABS) and MOF-5, a prototypical MOF, which is often used to benchmark H2 uptake capacity of other MOFs...
February 2018: Polymers for Advanced Technologies
https://www.readbyqxmd.com/read/29649622/stick-slip-motion-and-controlled-filling-speed-by-the-geometric-design-of-soft-micro-channels
#19
Johanna Andersson, Anette Larsson, Anna Ström
HYPOTHESIS: Liquid can move by capillary action through interconnected porous materials, as in fabric or paper towels. Today mass transport is controlled by chemical modification. It is, however, possible to direct mass transport by geometrical modifications. It is here proposed that it is possible to tailor capillary flow speed in a model system of micro-channels by the angle, size and position of attached side channels. EXPERIMENTS: A flexible, rapid, and cost-effective method is used to produce micro-channels in gels...
March 22, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29643526/-exploring-a-new-method-for-superimposition-of-pre-treatment-and-post-treatment-mandibular-digital-dental-casts-in-adults
#20
F F Dai, Y Liu, T M Xu, G Chen
OBJECTIVE: To explore a cone beam computed tomography (CBCT)-independent method for mandibular digital dental cast superimposition to evaluate three-dimensional (3D) mandibular tooth movement after orthodontic treatment in adults, and to evaluate the accuracy of this method. METHODS: Fifteen post-extraction orthodontic treatment adults from the Department of Orthodontics, Peking University School and Hospital of Stomatology were included. All the patients had four first premolars extracted, and were treated with straight wire appliance...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
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