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https://www.readbyqxmd.com/read/28640827/the-application-of-multi-baseline-digital-close-range-photogrammetry-in-three-dimensional-imaging-and-measurement-of-dental-casts
#1
Xiaoming Fu, Chun Peng, Zan Li, Shan Liu, Minmin Tan, Jinlin Song
OBJECTIVE: To explore a new technique for reconstructing and measuring three-dimensional (3D) models of orthodontic plaster casts using multi-baseline digital close-range photogrammetry (MBDCRP) with a single-lens reflex camera. STUDY DESIGN: Thirty sets of orthodontic plaster casts that do not exhibit severe horizontal overlap (>2 mm) between any two teeth were recorded by a single-lens reflex camera with 72 pictures taken in different directions. The 3D models of these casts were reconstructed and measured using the open source software MeshLab...
2017: PloS One
https://www.readbyqxmd.com/read/28629097/emerging-bone-tissue-engineering-via-polyhydroxyalkanoate-pha-based-scaffolds
#2
REVIEW
Janice Lim, Mingliang You, Jian Li, Zibiao Li
Polyhydroxyalkanoates (PHAs) are a class of biodegradable polymers derived from microorganisms. On top of their biodegradability and biocompatibility, different PHA types can contribute to varying mechanical and chemical properties. This has led to increasing attention to the use of PHAs in numerous biomedical applications over the past few decades. Bone tissue engineering refers to the regeneration of new bone through providing mechanical support while inducing cell growth on the PHA scaffolds having a porous structure for tissue regeneration...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28618432/accuracy-of-digital-vs-conventional-implant-impression-approach-a-three-dimensional-comparative-in-vitro-analysis
#3
Kinga Basaki, Hasan Alkumru, Grace De Souza, Yoav Finer
PURPOSE: To assess the three-dimensional (3D) accuracy and clinical acceptability of implant definitive casts fabricated using a digital impression approach and to compare the results with those of a conventional impression method in a partially edentulous condition. MATERIALS AND METHODS: A mandibular reference model was fabricated with implants in the first premolar and molar positions to simulate a patient with bilateral posterior edentulism. Ten implant-level impressions per method were made using either an intraoral scanner with scanning abutments for the digital approach or an open-tray technique and polyvinylsiloxane material for the conventional approach...
June 14, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28618187/physically-consistent-data-assimilation-method-based-on-feedback-control-for-patient-specific-blood-flow-analysis
#4
Satoshi Ii, Mohd Azrul Hisham Mohd Adib, Yoshiyuki Watanabe, Shigeo Wada
This paper presents a novel data assimilation method for patient-specific blood flow analysis based on feedback control theory called the physically consistent feedback control-based data assimilation (PFC-DA) method. In the PFC-DA method, the signal, which is the residual error term of the velocity when comparing the numerical and reference measurement data, is cast as a source term in a Poisson equation for the scalar potential field that induces flow in a closed system. The pressure values at the inlet and outlet boundaries are recursively calculated by this scalar potential field...
June 15, 2017: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/28613056/-a-preliminary-study-on-the-forming-quality-of-titanium-alloy-removable-partial-denture-frameworks-fabricated-by-selective-laser-melting
#5
Y F Liu, H Yu, W N Wang, B Gao
Objective: To evaluate the processing accuracy, internal quality and suitability of the titanium alloy frameworks of removable partial denture (RPD) fabricated by selective laser melting (SLM) technique, and to provide reference for clinical application. Methods: The plaster model of one clinical patient was used as the working model, and was scanned and reconstructed into a digital working model. A RPD framework was designed on it. Then, eight corresponding RPD frameworks were fabricated using SLM technique...
June 9, 2017: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/28590482/thickness-control-of-3-dimensional-mesoporous-silica-ultrathin-films-by-wet-etching
#6
Maho Kobayashi, Kyoka Susuki, Tomohiro Otani, Shinpei Enomoto, Haruo Otsuji, Yoshiyuki Kuroda, Hiroaki Wada, Atsushi Shimojima, Takayuki Homma, Kazuyuki Kuroda
The thickness of 3-dimensional (3D) mesoporous silica ultrathin films was controlled at a single-nanometer scale by wet-etching. A drop casting method with an aqueous etchant of ammonium fluoride was effective in etching the surfaces of films in the direction perpendicular to their substrates. The decrease in the film thickness depends on the interface tension of etching solutions. The wettability of thin films also influences the etching. CoPt nanodots were electrodeposited within ultrathin silica films on Ru substrates to form CoPt nanodot patterns...
June 7, 2017: Nanoscale
https://www.readbyqxmd.com/read/28576006/the-role-of-welding-techniques-in-the-biomechanical-behavior-of-implant-supported-prostheses
#7
Sabrina Alessandra Rodrigues, Anna Gabriella Camacho Presotto, Valentim Adelino Ricardo Barão, Rafael Leonardo Xediek Consani, Mauro Antônio Arruda Nóbilo, Marcelo Ferraz Mesquita
This in vitro study investigated the role of welding techniques of implant-supported prostheses in the 2D and 3D marginal misfits of prosthetic frameworks, strain induced on the mini abutment, and detorque of prosthetic screws. The correlations between the analyzed variables were also investigated. Frameworks were cast in commercially pure titanium (cp-Ti). A marginal misfit of 200μm was simulated in the working models (control group) (n=20). The 2D marginal misfit was analyzed according to the single-screw test protocol using a precision optical microscope...
September 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28554053/radiographic-evaluation-of-acute-distal-radius-fracture-stability-a-comparative-cadaveric-study-between-a-thermo-formable-bracing-system-and-traditional-fiberglass-casting
#8
Brandon G Santoni, Jazmine R Aira, Miguel A Diaz, T Kyle Stoops, Peter Simon
BACKGROUND: Distal radius fractures are common musculoskeletal injuries and many can be treated non-operatively with cast immobilization. A thermo-formable brace has been developed for management of such fractures, but no data exist regarding its comparative stabilizing efficacy to fiberglass casting. METHODS: A worst-case distal radius fracture was created in 6 cadaveric forearms. A radiolucent loading fixture was created to apply cantilever bending/compression loads ranging from 4...
May 19, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28552800/3d-printed-orodispersible-films-with-aripiprazole
#9
Witold Jamróz, Mateusz Kurek, Ewelina Łyszczarz, Joanna Szafraniec, Justyna Knapik-Kowalczuk, Karolina Syrek, Marian Paluch, Renata Jachowicz
Three dimensional printing technology is gaining in importance because of its increasing availability and wide applications. One of the three dimensional printing techniques is Fused Deposition Modelling (FDM) which works on the basis of hot melt extrusion-well known in the pharmaceutical technology. Combination of fused deposition modelling with preparation of the orodispersible film with poorly water soluble substance such as aripiprazole seems to be extra advantageous in terms of dissolution rate. 3D printed as well as casted films were compared in terms of physicochemical and mechanical properties...
May 24, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28526445/the-effectiveness-of-adhesives-on-the-retention-of-mandibular-free-end-saddle-partial-dentures-an-in-vitro-study
#10
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 17, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28508512/ultralight-multifunctional-carbon-based-aerogels-by-combining-graphene-oxide-and-bacterial-cellulose
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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 the 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: Intraoral impressions from 32 healthy newborns were taken monthly for 5 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
#19
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
#20
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
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