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3D surface scanning

H Chen, T Zhao, Y Wang, Y C Sun
OBJECTIVE: To establish a digital method for production of custom trays for edentulous jaws using fused deposition modeling (FDM) based on three-dimensional (3D) scans of primary jaw impressions, and to quantitatively evaluate the accuracy. METHODS: A red modeling compound was used to make a primary impression of a standard maxillary edentulous plaster model. The plaster model data and the primary impression tissue surface data were obtained using a 3D scanner. In the Gemomagic 2012 software, several commands were used, such as interactive drawing curves, partial filling holes, local offset, bodily offset, bodily shell, to imitate clinical procedures of drawing tray boundary, filling undercut, buffer, and generating the tray body...
October 18, 2016: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
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
Luca Fortunato, Sanghyun Jeong, Yiran Wang, Ali R Behzad, TorOve Leiknes
Fouling in membrane bioreactors (MBR) is acknowledged to be complex and unclear. An integrated characterization methodology was employed in this study to understand the fouling on a gravity-driven submerged MBR (GD-SMBR). It involved the use of different analytical tools, including optical coherence tomography (OCT), liquid chromatography with organic carbon detection (LC-OCD), total organic carbon (TOC), flow cytometer (FCM), adenosine triphosphate analysis (ATP) and scanning electron microscopy (SEM). The three-dimensional (3D) biomass morphology was acquired in a real-time through non-destructive and in situ OCT scanning of 75% of the total membrane surface directly in the tank...
October 1, 2016: Bioresource Technology
Xuezhi Ma, Yangzhi Zhu, Sanggon Kim, Qiushi Liu, Peter Byrley, Yang Wei, Jin Zhang, Kaili Jiang, Shoushan Fan, Ruoxue Yan, Ming Liu
Despite many efforts to fabricate high-aspect-ratio atomic force microscopy (HAR-AFM) probes for high-fidelity, high-resolution topographical imaging of three-dimensional (3D) nano-structured surfaces, current HAR probes still suffer from unsatisfactory performance, low wear-resistivity, and extravagant prices. The primary objective of this work is to demonstrate a novel design of a high-resolution (HR) HAR AFM probe, which is fabricated through a reliable, cost-efficient bench-top process to precisely implant a single ultra-sharp metallic nanowire on a standard AFM cantilever probe...
October 14, 2016: Nano Letters
Hang Feng, Xiangyi Fang, Dageng Huang, Chengcheng Yu, Songchuan Zhao, Dingjun Hao
BACKGROUND CONTEXT: Cervical disc arthroplasty has been gradually adopted as an alternative for the treatment of cervical degenerative disease. However, there is a large discrepancy between footprints of currently available cervical disc prostheses and anatomic dimensions of cervical endplates. PURPOSE: To accurately and comprehensively quantify the three-dimensional (3D) anatomic morphology of the cervical vertebral endplate and provide a theoretical basis for designing appropriate disc prostheses...
October 3, 2016: Spine Journal: Official Journal of the North American Spine Society
Clara L Essmann, Muna Elmi, Mike Shaw, Giridhar M Anand, Vijay M Pawar, Mandayam A Srinivasan
Atomic force microscopy (AFM) is a powerful method for topographic imaging of surfaces with nanometer resolution. AFM offers significant advantages over scanning electron microscopy (SEM) including the acquisition of quantitative 3D-images and biomechanical information. More importantly, for in-vivo biological imaging, AFM does not require sample dehydration/labeling. We show for the first time high-resolution topographical images of the cuticle of the model organism C. elegans under physiological conditions using AFM...
October 1, 2016: Nanomedicine: Nanotechnology, Biology, and Medicine
A Nerot, W Skalli, X Wang
Recent progress in 3D scanning technologies allows easy access to 3D human body envelope. To create personalized human models with an articulated linkage for realistic re-posturing and motion analyses, an accurate estimation of internal skeleton points, including joint centers, from the external envelope is required. For this research project, 3D reconstructions of both internal skeleton and external envelope from low dose biplanar X-rays of 40 male adults were obtained. Using principal component analysis technique (PCA), a low-dimensional dataset was used to predict internal points of the upper body from the trunk envelope...
September 14, 2016: Journal of Biomechanics
Woo Yeon Lee, Min Jung Kim, Dae Hyun Lew, Seung Yong Song, Dong Won Lee
BACKGROUND: Accurate breast volume assessment is a prerequisite to preoperative planning, as well as intraoperative decision making in breast reconstruction surgery. The use of three-dimensional surface imaging (3D scanning) to assess breast volume has many advantages. However, before employing 3D scanning in the field, the tool's validity should be demonstrated. The purpose of this study was to confirm the validity of 3D-scanning technology for evaluating breast volume. METHODS: We reviewed the charts of 25 patients who underwent breast reconstruction surgery immediately after total mastectomy...
September 2016: Archives of Plastic Surgery
Yinggang Lv, Yurong Jin, Dianguo Xu, Qiaohuan Yan, Guiting Liu, Hui Zhang, Dingling Yuan, Junhui Bao
PURPOSE: To evaluate the use of the 64-slice spiral computed tomography (CT) with perfusion-weighted imaging in the early diagnosis of ground-glass opacity lung cancers. METHODS: 412 patients with ground-glass opacities found by conventional CT scan in our hospital, and deemed highly suspected of being lung cancers, were enrolled in the study between February of 2012 and February of 2015. Sixty four-slice spiral CTs with perfusion-weighted imaging were carried out on all patients, and the latest nodular contrast analysis software, MPR2D, 3D reconstruction technology, MIP technology and perfusion scanning technology were used to analyze lesion types, density, blood supply, peripheral signals, doubling time and tissue perfusion characteristics...
July 2016: Journal of B.U.ON.: Official Journal of the Balkan Union of Oncology
Alessandra C de Paula Silveira, Sacha B Chaves, Leandro A Hilgert, Ana Paula D Ribeiro
STATEMENT OF PROBLEM: The precision of fit of chairside computer-aided design and computer-aided manufacturing (CAD-CAM) complete crowns is affected by digital impression and restorative material. PURPOSE: The purpose of this in vitro study was to evaluate by microcomputed tomography (μCT) the marginal and internal adaptation of composite resin and ceramic complete crowns fabricated with 2 different intraoral cameras and 2 restorative materials. MATERIAL AND METHODS: Ten extracted human third molars received crown preparations...
September 24, 2016: Journal of Prosthetic Dentistry
Carlos Carbonell, Adam B Braunschweig
Future nanomanufacturing tools will prepare organic materials with complex four-dimensional (4D) structure, where the position (x, y, z) and chemical composition within a volume is controlled with sub-1 μm spatial resolution. Such tools could produce substrates that mimic biological interfaces, like the cell surface or the extracellular matrix, whose topology and chemical complexity combine to direct some of the most sophisticated biological events. The control of organic materials at the nanoscale-level of spatial resolution could revolutionize the assembly of next generation optical and electronic devices or substrates for tissue engineering or enable fundamental biological or material science investigations...
September 19, 2016: Accounts of Chemical Research
Ali Reza Karimi, Azam Khodadadi
Fabrication of hydrogels based on chitosan (CS) with superb self-healing behavior and high mechanical and electrical properties has become a challenging and fascinating topic. Most of the conventional hydrogels lack these properties at the same time. Our objectives in this research were to synthesize, characterize, and evaluate the general properties of chitosan covalently cross-linked with zinc phthalocyanine tetra-aldehyde (ZnPcTa) framework. Our hope was to access an unprecedented self-healable three-dimensional (3D) nanostructure that would harvest the superior mechanical and electrical properties associated with chitosan...
October 12, 2016: ACS Applied Materials & Interfaces
Danni Li, Audrey Cheong, Gregory P Reece, Melissa A Crosby, Michelle C Fingeret, Fatima A Merchant
Stereophotography is now finding a niche in clinical breast surgery, and several methods for quantitatively measuring breast morphology from 3D surface images have been developed. Breast ptosis (sagging of the breast), which refers to the extent by which the nipple is lower than the inframammary fold (the contour along which the inferior part of the breast attaches to the chest wall), is an important morphological parameter that is frequently used for assessing the outcome of breast surgery. This study presents a novel algorithm that utilizes three-dimensional (3D) features such as surface curvature and orientation for the assessment of breast ptosis from 3D scans of the female torso...
September 9, 2016: Computers in Biology and Medicine
Jie Shi, Wen Zhang, Miao Tang, Richard J Caselli, Yalin Wang
Landmark curves were widely adopted in neuroimaging research for surface correspondence computation and quantified morphometry analysis. However, most of the landmark based morphometry studies only focused on landmark curve shape difference. Here we propose to compute a set of conformal invariant-based shape indices, which are associated with the landmark curve induced boundary lengths in the hyperbolic parameter domain. Such shape indices may be used to identify which surfaces are conformally equivalent and further quantitatively measure surface deformation...
September 6, 2016: Medical Image Analysis
Gili Kaufman, Drago Skrtic
Cariopathogen Streptococcus mutans (S. mutans) exists in infected dental pulp of deciduous teeth and is frequently linked with heart diseases. Organotypic (3D) dental pulp stem cells (DPSCs) cultures/microtissues, developed to mimic the physiological conditions in vivo, were utilized to assess the bacterial impact on their (i) 3D structural configuration, and (ii) recovery mechanisms. The cultures, developed in extracellular matrix (ECM) bio-scaffold (MatrigelTM), interacted with Wild type and GFP-tagged bacterial biofilms by permitting their infiltration through the ECM...
September 14, 2016: Journal of Medical Microbiology
Sorin Mihali, Silvana Canjau, Emanuel Bratu, Hom-Lay Wang
PURPOSE: The aim of this study was to evaluate, in a case control study, the esthetic and functional clinical performance of ceramic inlays used for covering the screw access hole in single monolithic lithium disilicate full-contour crowns bonded on computer-aided design/computer-aided manufacturing (CAD/CAM) prefabricated titanium abutments in order to eliminate the drawbacks of alternative restorative methods. MATERIALS AND METHODS: Twenty-eight patients with missing teeth in the lateral areas (premolars and molars) received screw-retained implant restorations...
September 2016: International Journal of Oral & Maxillofacial Implants
Chiara Villa, Jo Buckberry, Niels Lynnerup
Age at death estimation of human skeletal remains is one of the key issues in constructing a biological profile both in forensic and archaeological contexts. The traditional adult osteological methods evaluate macroscopically the morphological changes that occur with increasing age of specific skeletal indicators, such as the cranial sutures, the pubic bone, the auricular surface of the ilium and the sternal end of the ribs. Technologies such as computed tomography and laser scanning are becoming more widely used in anthropology, and several new methods have been developed...
September 13, 2016: Journal of Anatomy
Xiuqin Tan, Yifeng Wan, Yajing Huang, Chun He, Zaili Zhang, Zhuoyan He, Lingling Hu, Jiawei Zeng, Dong Shu
Three-dimensional (3D) MnO2 porous hollow microspheres (δ- and α- MnO2 PHMSs), with high adsorption and catalytic ozonation performance, were synthesized by a self-template (MnCO3 microspheres) process at room temperature. The synthesized MnO2 PHMSs were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET) surface area. The results showed that PHMSs exhibit the excellent adsorption ability and catalytic activity owning to their hollow spherical structure, mesoporous shell and well-defined interior voids, leading to the strong adsorption for bisphenol A (BPA) and the retention of O3 molecules on catalyst...
September 5, 2016: Journal of Hazardous Materials
Sara Blomberg, Jianfeng Zhou, Johan Gustafson, Johan Zetterberg, Edvin Lundgren
In recent years, efforts have been made in catalysis related surface science studies to explore the possibilities to perform experiments at conditions closer to those of a technical catalyst, in particular at increased pressures. Techniques such as high pressure scanning tunneling/atomic force microscopy (HPSTM/AFM), near ambient pressure x-ray photoemission spectroscopy (NAPXPS), surface x-ray diffraction (SXRD) and polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS) at semi-realistic conditions have been used to study the surface structure of model catalysts under reaction conditions, combined with simultaneous mass spectrometry (MS)...
November 16, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Khaled E Ahmed, John Whitters, Xiangyang Ju, S Gareth Pierce, Charles N MacLeod, Colin A Murray
PURPOSE: The aim of this study was to detail and assess the capability of a novel methodology to 3D-quantify tooth wear progression in a patient over a period of 12 months. MATERIALS AND METHODS: A calibrated stainless steel model was used to identify the accuracy of the scanning system by assessing the accuracy and precision of the contact scanner and the dimensional accuracy and stability of casts fabricated from three different types of impression materials. Thereafter, the overall accuracy of the 3D scanning system (scanner and casts) was ascertained...
September 2016: International Journal of Prosthodontics
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