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https://www.readbyqxmd.com/read/28526445/the-effectiveness-of-adhesives-on-the-retention-of-mandibular-free-end-saddle-partial-dentures-an-in-vitro-study
#1
Daniel Quiney, Wayne Nishio Ayre, Paul Milward
OBJECTIVES: Existing in vitro methods for testing denture adhesives do not fully replicate the complex oral geometries and environment; and in vivo methods are qualitative, prone to bias and not easily reproducible. The purpose of this study was to develop a novel, quantitative and more accurate model to test the effect of adhesives on the retentive force of mandibular free end saddle partial dentures. METHODS: An in vitro model was developed based on an anatomically accurate cast of a clinical case...
May 16, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28508512/ultralight-multifunctional-carbon-based-aerogels-by-combining-graphene-oxide-and-bacterial-cellulose
#2
Chao Li, Zhen-Yu Wu, Hai-Wei Liang, Jia-Fu Chen, Shu-Hong Yu
Nanostructured carbon aerogels with outstanding physicochemical properties have exhibited great application potentials in widespread fields and therefore attracted extensive attentions recently. It is still a challenge so far to develop flexible and economical routes to fabricate high-performance nanocarbon aerogels, preferably based on renewable resources. Here, ultralight and multifunctional reduced graphene oxide/carbon nanofiber (RGO/CNF) aerogels are fabricated from graphene oxide and low-cost, industrially produced bacterial cellulose by a three-step process of freeze-casting, freeze-drying, and pyrolysis...
May 16, 2017: Small
https://www.readbyqxmd.com/read/28502686/customized-polymethylmethacrylate-cranioplasty-implants-using-3d-printed-polylactic-acid-molds-technical-note-with-2-illustrative-cases
#3
Joe Abdel Hay, Tarek Smayra, Ronald Moussa
OBJECTIVE: Prefabricated customized cranioplasty implants are anatomically more accurate than manually shaped acrylic implants but remain costly. The authors describe a new cost-effective technique of producing customized polymethylmethacrylate (PMMA) cranioplasty implants using prefabricated 3D printed molds. METHODS: The first patient had a left frontal cranial defect following a craniotomy for a glial tumor. A 3D image of his skull was obtained from axial 0.6mm computed tomography (CT) scan images...
May 11, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/28498317/development-of-data-registration-and-fusion-methods-for-measurement-of-ultra-precision-freeform-surfaces
#4
Ling Bao Kong, Ming Jun Ren, Min Xu
The measurement of ultra-precision freeform surfaces commonly requires several datasets from different sensors to realize holistic measurements with high efficiency. The effectiveness of the technology heavily depends on the quality of the data registration and fusion in the measurement process. This paper presents methods and algorithms to address these issues. An intrinsic feature pattern is proposed to represent the geometry of the measured datasets so that the registration of the datasets in 3D space is casted as a feature pattern registration problem in a 2D plane...
May 12, 2017: Sensors
https://www.readbyqxmd.com/read/28492526/differentiation-of-cardiomyocytes-and-generation-of-human-engineered-heart-tissue
#5
Kaja Breckwoldt, David Letuffe-Brenière, Ingra Mannhardt, Thomas Schulze, Bärbel Ulmer, Tessa Werner, Anika Benzin, Birgit Klampe, Marina C Reinsch, Sandra Laufer, Aya Shibamiya, Maksymilian Prondzynski, Giulia Mearini, Dennis Schade, Sigrid Fuchs, Christiane Neuber, Elisabeth Krämer, Umber Saleem, Mirja L Schulze, Marita L Rodriguez, Thomas Eschenhagen, Arne Hansen
Since the advent of the generation of human induced pluripotent stem cells (hiPSCs), numerous protocols have been developed to differentiate hiPSCs into cardiomyocytes and then subsequently assess their ability to recapitulate the properties of adult human cardiomyocytes. However, hiPSC-derived cardiomyocytes (hiPSC-CMs) are often assessed in single-cell assays. A shortcoming of these assays is the limited ability to characterize the physiological parameters of cardiomyocytes, such as contractile force, due to random orientations...
June 2017: Nature Protocols
https://www.readbyqxmd.com/read/28491273/estimating-the-illumination-direction-from-three-dimensional-texture-of-brownian-surfaces
#6
Sylvia C Pont, Andrea J van Doorn, Jan J Koenderink
We studied whether human observers can estimate the illumination direction from 3D textures of random Brownian surfaces, containing undulations over a range of scales. The locally Lambertian surfaces were illuminated with a collimated beam from random directions. The surfaces had a uniform albedo and thus texture appeared only through shading and shadowing. The data confirm earlier results with Gaussian surfaces, containing undulations of a single scale. Observers were able to accurately estimate the source azimuth...
March 2017: I-Perception
https://www.readbyqxmd.com/read/28475739/a-step-by-step-development-of-real-size-chest-model-for-simulation-of-thoracoscopic-surgery
#7
Toshiaki Morikawa, Makoto Yamashita, Makoto Odaka, Yo Tsukamoto, Takamasa Shibasaki, Shohei Mori, Hisatoshi Asano, Tadashi Akiba
OBJECTIVES: For the purpose of simulating thoracoscopic surgery, we have conducted stepwise development of a life-like chest model including thorax and intrathoracic organs. METHODS: First, CT data of the human chest were obtained. First-generation model: based on the CT data, each component of the chest was made from a 3D printer. A hard resin was used for the bony thorax and a rubber-like resin for the vessels and bronchi. Lung parenchyma, muscles and skin were not created...
May 4, 2017: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/28459285/a-validation-study-of-reconstructed-rapid-prototyping-models-produced-by-two-technologies
#8
Christian Andreas Dietrich, Andreas Ender, Stefan Baumgartner, Albert Mehl
OBJECTIVE: To determine the accuracy (trueness and precision) of two different rapid prototyping (RP) techniques for the physical reproduction of three-dimensional (3D) digital orthodontic study casts, a comparative assessment using two 3D STL files of two different maxillary dentitions (two cases) as a reference was accomplished. MATERIALS AND METHODS: Five RP replicas per case were fabricated using both stereolithography (SLA) and the PolyJet system. The 20 reproduced casts were digitized with a highly accurate reference scanner, and surface superimpositions were performed...
May 1, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28459132/a-prospective-longitudinal-study-of-postnatal-dentoalveolar-and-palatal-growth-the-anatomical-basis-for-cad-cam-assisted-production-of-cleft-lip-palate-feeding-plates
#9
Franz X Bauer, Florian D Güll, Maximilian Roth, Lucas M Ritschl, Andrea Rau, Dominik Gau, Maximilian Gruber, Markus Eblenkamp, Bettina Hilmer, Klaus-Dietrich Wolff, Denys J Loeffelbein
Introduction This study describes dentoalveolar and palatal growth during the first months of life. Knowledge concerning this development is essential to avoid unwanted events such as mucosal ulcerations or restriction of growth when cleft-lip and palate (CLP) patients are treated. The results involve the generation of CAD/CAM CLP-feeding plates. Methods Intra-oral impressions from 32 healthy newborns were taken monthly for five months, supplemented by measurements of body weight, length, and occipital-frontal head circumference...
April 29, 2017: Clinical Anatomy
https://www.readbyqxmd.com/read/28457960/highly-degradable-porous-melt-derived-bioactive-glass-foam-scaffolds-for-bone-regeneration
#10
Amy Nommeots-Nomm, Sheyda Labbaf, Aine Devlin, Naomi Todd, Hua Geng, Anu K Solanki, Hok Man Tang, Polytimi Perdika, Alessandra Pinna, Fatemeh Ejeian, Olga Tsigkou, Peter D Lee, Mohammad Hossein Nasr Esfahani, Christopher A Mitchell, Julian R Jones
A challenge in using bioactive melt-derived glass in bone regeneration is to produce scaffolds with interconnected pores while maintaining the amorphous nature of the glass and its associated bioactivity. Here we introduce a method for creating porous melt-derived bioactive glass foam scaffolds with low silica content and report in vitro and preliminary in vivo data. The gel-cast foaming process was adapted, employing temperature controlled gelation of gelatin, rather than the in situ acrylic polymerisation used previously...
April 27, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28449864/generation-and-evaluation-of-3d-digital-casts-of-maxillary-defects-based-on-multisource-data-registration-a-pilot-clinical-study
#11
Hongqiang Ye, Qijun Ma, Yuezhong Hou, Man Li, Yongsheng Zhou
STATEMENT OF PROBLEM: Digital techniques are not clinically applied for 1-piece maxillary prostheses containing an obturator and removable partial denture retained by the remaining teeth because of the difficulty in obtaining sufficiently accurate 3-dimensional (3D) images. PURPOSE: The purpose of this pilot clinical study was to generate 3D digital casts of maxillary defects, including the defective region and the maxillary dentition, based on multisource data registration and to evaluate their effectiveness...
April 25, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28446343/from-short-electrospun-nanofibers-to-ultralight-aerogels-with-tunable-pore-structure
#12
Fabian Deuber, Christian Adlhart
Nanofiber production by electrospinning has made great progress over the past two decades. Recently the research area was revolutionized by a novel post-processing approach. By cutting the endless and intertwined nanofibers into short pieces, it is now possible to reassemble them into interconnected 3D structures. Such highly porous structures are built from dispersed short nanofibers by freeze-casting. This solid templating process controls the structures' ultimate properties and architecture in terms of primary and secondary pores below 5 μm and between 10 and 300 μm, respectively...
April 26, 2017: Chimia
https://www.readbyqxmd.com/read/28439406/angiographic-anatomy-of-the-extracranial-and-intracranial-portions-of-the-internal-carotid-arteries-in-donkeys
#13
Nurul Hayah Khairuddin, Martin Sullivan, Patrick J Pollock
BACKGROUND: In horses, the extracranial and intracranial pathway of the internal carotid artery has been described. The extracranial pathway of the internal carotid artery begins at the carotid termination and runs on the dorsal surface of the medial compartment of the guttural pouch. Thereafter the internal carotid artery passes through the foramen lacerum to continue intracranially, forming part of the rostrolateral quadrants of the cerebral arterial circle (Circle of Willis). The objectives of this study were to define and record the anatomy of the carotid arterial tree and the internal carotid artery in donkeys using angiographic techniques...
2017: Irish Veterinary Journal
https://www.readbyqxmd.com/read/28438070/creation-of-a-novel-simulator-for-minimally-invasive-neurosurgery-fusion-of-3d-printing-and-special-effects
#14
Peter Weinstock, Roberta Rehder, Sanjay P Prabhu, Peter W Forbes, Christopher J Roussin, Alan R Cohen
OBJECTIVE Recent advances in optics and miniaturization have enabled the development of a growing number of minimally invasive procedures, yet innovative training methods for the use of these techniques remain lacking. Conventional teaching models, including cadavers and physical trainers as well as virtual reality platforms, are often expensive and ineffective. Newly developed 3D printing technologies can recreate patient-specific anatomy, but the stiffness of the materials limits fidelity to real-life surgical situations...
April 25, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28428034/near-anatomical-correction-using-a-ct-guided-technique-of-a-forearm-malunion-in-a-15-year-old-girl-a-case-report-including-surgical-technique
#15
Ralph M Jeuken, Roel P Hendrickx, Martijn G Schotanus, Edwin J Jansen
BACKGROUND: In this case report we describe a left-arm both-bone forearm fracture in a 15-year old girl who fell off of a swing. Conservative treatment with an above-elbow cast failed,resulting in a malunion with functional impairment. The pro- and supination were 90/0/10, respectively. The patient complained of difficulties performing daily activities. For this pediatric case a corrective osteotomy was proposed using a CT-guided technique aiming for maximum anatomical and functional outcome...
April 17, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28425999/three-dimensional-printing-of-transparent-fused-silica-glass
#16
Frederik Kotz, Karl Arnold, Werner Bauer, Dieter Schild, Nico Keller, Kai Sachsenheimer, Tobias M Nargang, Christiane Richter, Dorothea Helmer, Bastian E Rapp
Glass is one of the most important high-performance materials used for scientific research, in industry and in society, mainly owing to its unmatched optical transparency, outstanding mechanical, chemical and thermal resistance as well as its thermal and electrical insulating properties. However, glasses and especially high-purity glasses such as fused silica glass are notoriously difficult to shape, requiring high-temperature melting and casting processes for macroscopic objects or hazardous chemicals for microscopic features...
April 19, 2017: Nature
https://www.readbyqxmd.com/read/28421741/uphill-water-transport-on-a-wettability-patterned-surface-experimental-and-theoretical-results
#17
Yuji Hirai, Hiroyuki Mayama, Yasutaka Matsuo, Masatsugu Shimomura
In nature, there exist many functional water-controlling surfaces, such as the water-repellent surface of lotus leaves, the superhydrophobic water-adhesive surface of rose petals, the water-harvesting surface of a beetle's back, and the water-transporting surface of the legs of Ligia exotica. These natural surfaces suggest that surface chemistry and hierarchical structures are essential for controlling the water behavior. We have reported the preparation of superhydrophobic and antireflection silicon nanospike-array structures using self-organized honeycomb-patterned films as three-dimensional dry-etching masks...
May 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28415525/mechanical-thermal-and-morphological-characterisation-of-3d-porous-pennisetum-purpureum-pla-biocomposites-scaffold
#18
R Revati, M S Abdul Majid, M J M Ridzuan, M Normahira, N F Mohd Nasir, M N Rahman Y, A G Gibson
The mechanical, thermal, and morphological properties of a 3D porous Pennisetum purpureum (PP)/polylactic acid (PLA) based scaffold were investigated. In this study, a scaffold containing P. purpureum and PLA was produced using the solvent casting and particulate leaching method. P. purpureum fibre, also locally known as Napier grass, is composed of 46% cellulose, 34% hemicellulose, and 20% lignin. PLA composites with various P. purpureum contents (10%, 20%, and 30%) were prepared and subsequently characterised...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28405900/evaluation-of-pre-surgical-models-for-uterine-surgery-by-use-of-three-dimensional-printing-and-mold-casting
#19
Sayed Ahmad Zikri Bin Sayed Aluwee, Xiangrong Zhou, Hiroki Kato, Hiroshi Makino, Chisako Muramatsu, Takeshi Hara, Masayuki Matsuo, Hiroshi Fujita
We propose an approach to supporting pre-surgical planning for the uterus by integrating medical image analysis and physical model generation based on 3D printing. With our method, we first segment the patient-specific anatomy and lesions of the uterus on MR images; then, we create a 3D physical model, an exact replica of the patient's uterus in terms of size and softness, with transparency for easy observation of the internal structures of the uterus. In our experiments, we created pre-surgical models of hysterectomy for five patients who had been diagnosed to have uterine endometrial cancer...
April 12, 2017: Radiological Physics and Technology
https://www.readbyqxmd.com/read/28387500/effect-of-3d-printed-microvascular-network-design-on-the-self-healing-behavior-of-cross-linked-polymers
#20
G Postiglione, M Alberini, S Leigh, M Levi, S Turri
This article describes the manufacturing procedure and the characterization of self-healing polymers based on embedded microvascular networks. The samples were realized by resin casting into water-soluble PVA molds, fabricated via 3D printing. This technology allowed us to exploit the 3D printers' ability to produce complex structures with high resolution for the creation of independent microchannels networks. The two reacting components of a two-part resin could be stored separately within the microstructure...
April 12, 2017: ACS Applied Materials & Interfaces
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