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https://www.readbyqxmd.com/read/27915125/artificial-neural-networks-as-a-powerful-numerical-tool-to-classify-specific-features-of-a-tooth-based-on-3d-scan-data
#1
Stefan Raith, Eric Per Vogel, Naeema Anees, Christine Keul, Jan-Frederik Güth, Daniel Edelhoff, Horst Fischer
Chairside manufacturing based on digital image acquisition is gainingincreasing importance in dentistry. For the standardized application of these methods, it is paramount to have highly automated digital workflows that can process acquired 3D image data of dental surfaces. Artificial Neural Networks (ANNs) arenumerical methods primarily used to mimic the complex networks of neural connections in the natural brain. Our hypothesis is that an ANNcan be developed that is capable of classifying dental cusps with sufficient accuracy...
November 27, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/27913222/human-liver-regeneration-in-advanced-cirrhosis-is-organized-by-the-portal-tree
#2
Katalin Dezső, András Rókusz, Edina Bugyik, Armanda Szücs, András Szuák, Bence Dorogi, Mátyás Kiss, Ágnes Nemeskéri, Péter Nagy, Sándor Paku
BACKGROUND&AIMS: In advanced cirrhosis new hepatocytic nodules are generated by budding of ductules in areas of parenchymal extinction. However, the vascular alterations in the areas of parenchymal extinction, the blood supply and the structure of the new hepatocytic nodules have not been analyzed in detail. METHODS: Explanted human cirrhotic livers of three different etiologies and two experimental models of cirrhosis in rats were examined thoroughly. 3D reconstruction of the immunohistochemically stained serial sections and casting of human and experimental cirrhotic livers have been used to reveal the structural organization of the regenerative buds...
November 29, 2016: Journal of Hepatology
https://www.readbyqxmd.com/read/27887969/flexible-head-casts-for-high-spatial-precision-meg
#3
Sofie S Meyer, James Bonaiuto, Mark Lim, Holly Rossiter, Sheena Waters, David Bradbury, Sven Bestmann, Matthew Brookes, Martina F Callaghan, Nikolaus Weiskopf, Gareth R Barnes
BACKGROUND: In combination with magnetoencephalographic (MEG) data, accurate knowledge of the brain's structure and location provide a principled way of reconstructing neural activity with high temporal resolution. However, measuring the brain's location is compromised by head movement during scanning, and by fiducial-based co-registration with magnetic resonance imaging (MRI) data. The uncertainty from these two factors introduces errors into the forward model and limit the spatial resolution of the data...
November 22, 2016: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/27886811/morphoarchitectural-variation-in-south-african-fossil-cercopithecoid-endocasts
#4
Amélie Beaudet, Jean Dumoncel, Frikkie de Beer, Benjamin Duployer, Stanley Durrleman, Emmanuel Gilissen, Jakobus Hoffman, Christophe Tenailleau, John Francis Thackeray, José Braga
Despite the abundance of well-preserved crania and natural endocasts in the South African Plio-Pleistocene cercopithecoid record, which provide direct information relevant to the evolution of their endocranial characteristics, few studies have attempted to characterize patterns of external brain morphology in this highly successful primate Superfamily. The availability of non-destructive penetrating radiation imaging systems, together with recently developed computer-based analytical tools, allow for high resolution virtual imaging and modeling of the endocranial casts and thus disclose new perspectives in comparative paleoneurology...
December 2016: Journal of Human Evolution
https://www.readbyqxmd.com/read/27884347/fabrication-of-three-dimensional-scan-to-print-ear-model-for-microtia-reconstruction
#5
Byoungjun Jeon, Chiwon Lee, Myungjoon Kim, Tae Hyun Choi, Sungwan Kim, Sukwha Kim
BACKGROUND: Microtia is a congenital deformity of the external ear that occurs in 1 of every 5000 births. Microtia reconstruction using traditional two-dimensional templates does not provide highly detailed ear shapes. Here, we describe the feasibility of using a three-dimensional (3D) ear model as a reference. MATERIALS AND METHODS: Seven children aged from 11 to 16 (6 grade III and 1 grade II microtia) were recruited from Seoul National University Children's Hospital, Korea...
December 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27836143/facially-generated-and-cephalometric-guided-3d-digital-design-for-complete-mouth-implant-rehabilitation-a-clinical-report
#6
Christian Coachman, Marcelo Alexandre Calamita, Francis Gray Coachman, Robert Gray Coachman, Newton Sesma
Harmony among the teeth, lips, and facial components is the goal of prosthodontic treatment, whether performed by conventional or digital workflow methods. This clinical report describes a facial approach to planning computer-guided surgery and immediate computer-aided designed and computer-aided manufactured (CAD-CAM) interim complete-arch fixed dental prostheses on immediately placed dental implants with a digital workflow. A single clinical appointment for data collection included dentofacial documentation with photographs and videos...
November 8, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27834416/accuracy-and-efficiency-of-full-arch-digitalization-and-3d-printing-a-comparison-between-desktop-model-scanners-an-intraoral-scanner-a-cbct-model-scan-and-stereolithographic-3d-printing
#7
Christian Wesemann, Jonas Muallah, James Mah, Axel Bumann
OBJECTIVE: The primary objective of this study was to compare the accuracy and time efficiency of an indirect and direct digitalization workflow with that of a three-dimensional (3D) printer in order to identify the most suitable method for orthodontic use. METHOD AND MATERIALS: A master model was measured with a coordinate measuring instrument. The distances measured were the intercanine width, the intermolar width, and the dental arch length. Sixty-four scans were taken with each of the desktop scanners R900 and R700 (3Shape), the intraoral scanner TRIOS Color Pod (3Shape), and the Promax 3D Mid cone beam computed tomography (CBCT) unit (Planmeca)...
November 10, 2016: Quintessence International
https://www.readbyqxmd.com/read/27833794/three-dimensional-paleohistology-of-the-scale-and-median-fin-spine-of-lophosteus-superbus-pander-1856
#8
Anna Jerve, Qingming Qu, Sophie Sanchez, Henning Blom, Per Erik Ahlberg
Lophosteus superbus is one of only a handful of probable stem-group osteichthyans known from the fossil record. First collected and described in the late 19th century from the upper Silurian Saaremaa Cliff locality in Estonia, it is known from a wealth of disarticulated scales, fin spines, and bone fragments. In this study we provide the first description of the morphology and paleohistology of a fin spine and scale from Lophosteus using virtual thin sections and 3D reconstructions that were segmented using phase-contrast synchrotron X-ray microtomography...
2016: PeerJ
https://www.readbyqxmd.com/read/27818308/i-wire-heart-on-a-chip-i-three-dimensional-cardiac-tissue-constructs-for-physiology-and-pharmacology
#9
Veniamin Y Sidorov, Philip C Samson, Tatiana N Sidorova, Jeffrey M Davidson, Chee C Lim, John P Wikswo
Engineered 3D cardiac tissue constructs (ECTCs) can replicate complex cardiac physiology under normal and pathological conditions. Currently, most measurements of ECTC contractility are either made isometrically, with fixed length and without control of the applied force, or auxotonically against a variable force, with the length changing during the contraction. The "I-Wire" platform addresses the unmet need to control the force applied to ECTCs while interrogating their passive and active mechanical and electrical characteristics...
November 3, 2016: Acta Biomaterialia
https://www.readbyqxmd.com/read/27813012/confined-growth-of-metal-nanoparticles-within-3d-dna-origami-molds
#10
Wei Sun, Jie Shen
Manufacturing prescribed shaped metal nanoparticles promises emerging applications in plasmonics, energy, and disease diagnosis. The key to the shape-controllable synthesis is generating local environments encoded with prescribed geometrical information. Here, we describe a general strategy that uses 3D self-assembled DNA origami as mold to confine the casting growth of metal nanoparticle. By transferring the shape information from DNA cavities to metal nanoparticles, metal nanoparticles with prescribed shapes, dimensions, and surface binding features could be rationally designed and synthesized...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27806596/unwrapping-3d-complex-hollow-organs-for-spatial-dose-surface-analysis
#11
A Witztum, B George, S Warren, M Partridge, M A Hawkins
PURPOSE: Toxicity dose-response models describe the correlation between dose delivered to an organ and a given toxic endpoint. Duodenal toxicity is a dose limiting factor in the treatment of pancreatic cancer with radiation but the relationship between dose and toxicity in the duodenum is not well understood. While there have been limited studies into duodenal toxicity through investigations of the volume of the organ receiving dose over a specific threshold, both dose-volume and dose-surface histograms lack spatial information about the dose distribution, which may be important in determining normal tissue response...
November 2016: Medical Physics
https://www.readbyqxmd.com/read/27767256/digital-evaluation-of-three-splinting-materials-used-to-fabricate-verification-jigs-for-full-arch-implant-prostheses-a-comparative-study
#12
Panos Papaspyridakos, Yong-Jeong Kim, Matthew Finkelman, Khaled El-Rafie, Hans-Peter Weber
PURPOSE: The primary aim of this study was to assess the accuracy of different splinting materials to make implant cast verification jigs. The secondary aim was to assess the effect of 20° implant angulation on the accuracy of casts. MATERIALS AND METHODS: An edentulous mandibular arch with five internal connection tissue level implants served as control. The three implants in the anterior region were parallel to each other and the two implants in the posterior region were distally tilted 20° bilaterally...
October 21, 2016: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/27762606/geometric-morphometric-analysis-of-the-palatal-morphology-in-children-with-impacted-incisors-a-three-dimensional-evaluation
#13
Chiara Pavoni, Valeria Paoloni, Luis Tomas Huanca Ghislanzoni, Giuseppina Laganà, Paola Cozza
OBJECTIVE: To analyze variations in palatal morphology in subjects presenting unilaterally impacted maxillary permanent central incisors compared with a control group of subjects without eruption anomalies using a three-dimensional (3D) analysis. MATERIALS AND METHODS: Twenty-six white subjects (10 girls and 16 boys; mean age 9.5 ± 1.5 years) with unilaterally impacted maxillary permanent central incisors (impacted incisor group [IIG]) were compared with a control group (CG) of 26 subjects (14 girls and 12 boys, mean age 8...
October 20, 2016: Angle Orthodontist
https://www.readbyqxmd.com/read/27761588/post-treatment-changes-in-permanent-retention
#14
Michael Wolf, U Schulte, K Küpper, C Bourauel, L Keilig, S N Papageorgiou, C Dirk, C Kirschneck, N Daratsianos, A Jäger
OBJECTIVES: While permanent retention is today the method of choice to stabilize orthodontic treatment outcomes, recent studies have increasingly reported posttreatment changes in tooth position during permanent retention. We conducted this study to analyze changes in the anterior mandible, whether the changes follow an underlying movement pattern, and, aiming for a preventive strategy, whether any risk factors could be identified comparing findings with the pretreatment situations. METHODS: We included 30 patients who had worn fixed Twistflex retainers (UK 3-3) extending from canine to canine in the mandible...
October 19, 2016: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
https://www.readbyqxmd.com/read/27752175/-quantitative-evaluation-of-fabricating-complete-denture-by-computer-numerical-control-in-manufacturing-dentition-and-baseplate-separately-plus-adhesive-molding
#15
H Wang, P J Lv, Y Wang, Y C Sun
OBJECTIVE: To quantitatively evaluate the assembly precision of fabricating complete denture by computer numerical control (CNC) in manufacturing dentition and baseplate separately plus adhesive molding. METHODS: The 3D surface data of a standard edentulous maxilla plaster cast model and the temporary base-plate were obtained using an Activity 880 3D scanner. The data (data1) of a complete denture were designed using a set of computer aided design (CAD) software developed by the research group of this study...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/27730649/pediatric-laryngeal-simulator-using-3d-printed-models-a-novel-technique
#16
Katherine R Kavanagh, Valerie Cote, Yvonne Tsui, Simon Kudernatsch, Donald R Peterson, Tulio A Valdez
OBJECTIVE: Simulation to acquire and test technical skills is an essential component of medical education and residency training in both surgical and nonsurgical specialties. High-quality simulation education relies on the availability, accessibility, and reliability of models. The objective of this work was to describe a practical pediatric laryngeal model for use in otolaryngology residency training. Ideally, this model would be low-cost, have tactile properties resembling human tissue, and be reliably reproducible...
October 12, 2016: Laryngoscope
https://www.readbyqxmd.com/read/27719703/-evaluation-of-therapeutic-effect-of-virtual-design-for-correcting-facial-asymmetry-of-skeletal-class-%C3%A2-deformity
#17
K Y Tian, Q Q Li, X J Liu, X X Wang, Z L Li, X Wang
Objective: To establish a computer-aided surgical simulation procedure based on the natural head position(NHP) for orthognathic surgery and to access the effect for correcting facial asymmetry for skeletal Class Ⅲ deformity. Methods: Thirty-five patients(male: 14 and female: 21, mean age: [21.5±2.3] years) of skeletal Class Ⅲ deformity with facial asymmetry were included and divided into virtual group (16 patients) and control group(19 patients). The computer-aided surgical simulation procedure was used in the virtual group and the intermediate and final splints were fabricated using the rapid protyping technique...
October 9, 2016: Zhonghua Kou Qiang Yi Xue za Zhi, Zhonghua Kouqiang Yixue Zazhi, Chinese Journal of Stomatology
https://www.readbyqxmd.com/read/27701462/accuracy-of-a-real-time-computerized-binocular-three-dimensional-trajectory-tracking-device-for-recording-functional-mandibular-movements
#18
Tian Zhao, Huifang Yang, Huaxin Sui, Satyajeet Sudhir Salvi, Yong Wang, Yuchun Sun
OBJECTIVE: Developments in digital technology have permitted researchers to study mandibular movements. Here, the accuracy of a real-time, computerized, binocular, three-dimensional (3D) trajectory-tracking device for recording functional mandibular movements was evaluated. METHODS: An occlusal splint without the occlusal region was created based on a plaster cast of the lower dentition. The splint was rigidly connected with a target on its labial side and seated on the cast...
2016: PloS One
https://www.readbyqxmd.com/read/27677879/preoperative-planning-with-three-dimensional-reconstruction-of-patient-s-anatomy-rapid-prototyping-and-simulation-for-endoscopic-mitral-valve-repair
#19
Peyman Sardari Nia, Samuel Heuts, Jean Daemen, Peter Luyten, Jindrich Vainer, Jan Hoorntje, Emile Cheriex, Jos Maessen
OBJECTIVES: Mitral valve repair performed by an experienced surgeon is superior to mitral valve replacement for degenerative mitral valve disease; however, many surgeons are still deterred from adapting this procedure because of a steep learning curve. Simulation-based training and planning could improve the surgical performance and reduce the learning curve. The aim of this study was to develop a patient-specific simulation for mitral valve repair and provide a proof of concept of personalized medicine in a patient prospectively planned for mitral valve surgery...
September 27, 2016: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/27636767/-comparative-analysis-of-3d-data-accuracy-of-single-tooth-and-full-dental-arch-captured-by-different-intraoral-and-laboratory-digital-impression-systems
#20
V A Parunov, P V Yurkovets, I Yu Lebedenko
The aim of the study was to examine changes in physical and mechanical properties of dental alloys depending of the initial composition at re-casting. Russianc precious alloys: Plagodent (AuPtPd) and Palladent (PdAu) and base alloys: Vitiriy-N (NiCrMo) and Vitiriy-C (CoCrMo) were used as study samples, which were divided in three groups: a primary casting from the granules; 50% of re-casting; 100% of re-casting. We investigated the yield strength in bending, coefficient of thermal expansion and hardness. Changing in the composition of the alloys has led to changes of all physical and mechanical properties...
2016: Stomatologii︠a︡
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