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https://www.readbyqxmd.com/read/28738248/the-reliability-and-validity-of-measurements-of-human-dental-casts-made-by-an-intra-oral-3d-scanner-with-conventional-hand-held-digital-callipers-as-the-comparison-measure
#1
Mithun Rajshekar, Roberta Julian, Anne-Marie Williams, Marc Tennant, Alex Forrest, Laurence J Walsh, Gary Wilson, Leigh Blizzard
AIM: Intra-oral 3D scanning of dentitions has the potential to provide a fast, accurate and non-invasive method of recording dental information. The aim of this study was to assess the reliability of measurements of human dental casts made using a portable intra-oral 3D scanner appropriate for field use. METHOD: Two examiners each measured 84 tooth and 26 arch features of 50 sets of upper and lower human dental casts using digital hand-held callipers, and secondly using the measuring tool provided with the Zfx IntraScan intraoral 3D scanner applied to the virtual dental casts...
July 13, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28732176/a-comprehensive-craniofacial-study-of-22q11-2-deletion-syndrome
#2
A Lewyllie, J Roosenboom, K Indencleef, P Claes, A Swillen, K Devriendt, C Carels, M Cadenas De Llano-Pérula, G Willems, G Hens, A Verdonck
The 22q11.2 deletion syndrome (22q11.2DS) is one of the most frequent microdeletion syndromes and presents with a highly variable phenotype. In most affected individuals, specific but subtle facial features can be seen. In this observational study, we aim to investigate the craniofacial and dental features of 20 children with a confirmed diagnosis of 22q11.2DS by analyzing 3-dimensional (3D) facial surface scans, 2-dimensional (2D) clinical photographs, panoramic and cephalometric radiographs, and dental casts...
July 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28725252/individualized-3d-scanning-and-printing-for-non-melanoma-skin-cancer-brachytherapy-a-financial-study-for-its-integration-into-clinical-workflow
#3
Meritxell Arenas, Sebastià Sabater, Andreu Sintas, Monica Arguís, Víctor Hernández, Miguel Árquez, Iolanda López, Àngeles Rovirosa, Doménec Puig
PURPOSE: Skin cancer is the most common tumor in the population. There are different therapeutic modalities. Brachytherapy is one of the techniques used, in which it is necessary to build customized moulds for some patients. Currently, these moulds are made by hand using rudimentary techniques. We present a new procedure based on 3D printing and the analysis of the clinical workflow. MATERIAL AND METHODS: Moulds can be made either by hand or by automated 3D printing...
June 2017: Journal of Contemporary Brachytherapy
https://www.readbyqxmd.com/read/28724930/assessment-of-different-techniques-for-3d-superimposition-of-serial-digital-maxillary-dental-casts-on-palatal-structures
#4
Georgios Vasilakos, Roman Schilling, Demetrios Halazonetis, Nikolaos Gkantidis
Serial 3-dimensional dental model superimposition provides a risk-free, detailed evaluation of morphological alterations on a patient's mouth. Here, we evaluated accuracy and precision of five palatal areas, used for superimposition of maxillary 3D digital dental casts. Sixteen pre- and post-orthodontic treatment dental casts of growing patients (median time lapse: 15.1 months) were superimposed on each palatal area using the iterative closest point algorithm. Area A (medial 2/3 of the third rugae and a small area dorsal to them) was considered the gold standard, due to high anatomical stability...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28722350/multidimensional-anodized-titanium-foam-photoelectrode-for-efficient-utilization-of-photons-in-mesoscopic-solar-cells
#5
Jin Soo Kang, Hyelim Choi, Jin Kim, Hyeji Park, Jae-Yup Kim, Jung-Woo Choi, Seung-Ho Yu, Kyung Jae Lee, Yun Sik Kang, Sun Ha Park, Yong-Hun Cho, Jun-Ho Yum, David C Dunand, Heeman Choe, Yung-Eun Sung
Mesoscopic solar cells based on nanostructured oxide semiconductors are considered as a promising candidates to replace conventional photovoltaics employing costly materials. However, their overall performances are below the sufficient level required for practical usages. Herein, this study proposes an anodized Ti foam (ATF) with multidimensional and hierarchical architecture as a highly efficient photoelectrode for the generation of a large photocurrent. ATF photoelectrodes prepared by electrochemical anodization of freeze-cast Ti foams have three favorable characteristics: (i) large surface area for enhanced light harvesting, (ii) 1D semiconductor structure for facilitated charge collection, and (iii) 3D highly conductive metallic current collector that enables exclusion of transparent conducting oxide substrate...
July 19, 2017: Small
https://www.readbyqxmd.com/read/28720339/in%C3%A2-vitro-fit-of-cad-cam-complete-arch-screw-retained-titanium-and-zirconia-implant-prostheses-fabricated-on-4-implants
#6
Hadi Al-Meraikhi, Burak Yilmaz, Edwin McGlumphy, William Brantley, William M Johnston
STATEMENT OF PROBLEM: Computer-aided designed and computer-aided manufactured (CAD-CAM) titanium and zirconia implant-supported fixed implant prostheses on 4 implants have become popular. The precision and accuracy of their interface fit has not been widely researched. PURPOSE: The purpose of this in vitro study was to compare the marginal fit of zirconia and titanium implant-supported screw-retained CAD-CAM complete fixed dental prostheses (CFDP) fit with a standardized cast simulating the all-on-4 implant distribution...
July 15, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28714897/development-of-three-dimensional-dental-scanning-apparatus-using-structured-illumination
#7
Jae Sung Ahn, Anjin Park, Ju Wan Kim, Byeong Ha Lee, Joo Beom Eom
We demonstrated a three-dimensional (3D) dental scanning apparatus based on structured illumination. A liquid lens was used for tuning focus and a piezomotor stage was used for the shift of structured light. A simple algorithm, which detects intensity modulation, was used to perform optical sectioning with structured illumination. We reconstructed a 3D point cloud, which represents the 3D coordinates of the digitized surface of a dental gypsum cast by piling up sectioned images. We performed 3D registration of an individual 3D point cloud, which includes alignment and merging the 3D point clouds to exhibit a 3D model of the dental cast...
July 15, 2017: Sensors
https://www.readbyqxmd.com/read/28712382/design-and-fabrication-of-a-three-dimensional-in-vitro-system-for-modeling-vascular-stenosis
#8
Rebecca S Jones, Pin H Chang, Tzlil Perahia, Katrina A Harmon, Lorain Junor, Michael J Yost, Daping Fan, John F Eberth, Richard L Goodwin
Vascular stenosis, the abnormal narrowing of blood vessels, arises from defective developmental processes or atherosclerosis-related adult pathologies. Stenosis triggers a series of adaptive cellular responses that induces adverse remodeling, which can progress to partial or complete vessel occlusion with numerous fatal outcomes. Despite its severity, the cellular interactions and biophysical cues that regulate this pathological progression are poorly understood. Here, we report the design and fabrication of a three-dimensional (3D) in vitro system to model vascular stenosis so that specific cellular interactions and responses to hemodynamic stimuli can be investigated...
July 17, 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28699619/highly-defined-3d-printed-chitosan-scaffolds-featuring-improved-cell-growth
#9
Lisa Elviri, Ruben Foresti, Carlo Bergonzi, Francesca Zimetti, Cinzia Marchi, Annalisa Bianchera, Franco Bernini, Marco Silvestri, Ruggero Bettini
The augmented demand for medical devices devoted to tissue regeneration and possessing a controlled micro-architecture means there is a need for industrial scale-up in the production of hydrogels. A new 3D printing technique was applied to the automation of a freeze-gelation method for the preparation of chitosan scaffolds with controlled porosity. For this aim, a dedicated 3D printer was built in-house: a preliminary effort has been necessary to explore the printing parameter space to optimize the printing results in terms of geometry, tolerances and mechanical properties of the product...
July 12, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28699281/promoting-cell-migration-in-tissue-engineering-scaffolds-with-graded-channels
#10
Degang Yang, Zhitong Zhao, Fan Bai, Shutao Wang, Antoni P Tomsia, Hao Bai
Ideal bone scaffolds having good biocompatibility, good biodegradability, and beneficial mechanical properties are the basis for bone tissue engineering. Specifically, cell migration within 3D scaffolds is crucial for bone regeneration of critical size defects. In this research, hydroxyapatite scaffolds with three different types of architectures (tortuous, parallel, and graded channels) are fabricated using the freeze-casting (ice-templating) method. While most studies promote cell migration by chemical factors, it can be greatly enhanced by introducing only graded channels as compared with tortuous or parallel channels...
July 12, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28697204/preliminary-clinical-application-of-removable-partial-denture-frameworks-fabricated-using-computer-aided-design-and-rapid-prototyping-techniques
#11
Hongqiang Ye, Jing Ning, Man Li, Li Niu, Jian Yang, Yuchun Sun, Yongsheng Zhou
PURPOSE: The aim of this study was to explore the application of computer-aided design and rapid prototyping (CAD/RP) for removable partial denture (RPD) frameworks and evaluate the fitness of the technique for clinical application. MATERIALS AND METHODS: Three-dimensional (3D) images of dentition defects were obtained using a lab scanner. The RPD frameworks were designed using commercial dental software and manufactured using selective laser melting (SLM). A total of 15 cases of RPD prostheses were selected, wherein each patient received two types of RPD frameworks, prepared by CAD/RP and investment casting...
July 2017: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/28691283/a-soft-total-artificial-heart-first-concept-evaluation-on-a-hybrid-mock-circulation
#12
Nicholas H Cohrs, Anastasios Petrou, Michael Loepfe, Maria Yliruka, Christoph M Schumacher, A Xavier Kohll, Christoph T Starck, Marianne Schmid Daners, Mirko Meboldt, Volkmar Falk, Wendelin J Stark
The technology of 3D-printing has allowed the production of entirely soft pumps with complex chamber geometries. We used this technique to develop a completely soft pneumatically driven total artificial heart from silicone elastomers and evaluated its performance on a hybrid mock circulation. The goal of this study is to present an innovative concept of a soft total artificial heart (sTAH). Using the form of a human heart, we designed a sTAH, which consists of only two ventricles and produced it using a 3D-printing, lost-wax casting technique...
July 10, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28684068/analyzing-the-teeth-next-to-the-alveolar-cleft-examination-and-treatment-proposal-prior-to-bone-grafting-based-on-three-dimensional-versus-two-dimensional-diagnosis-a-diagnostic-study
#13
Susanne Wriedt, Bilal Al-Nawas, Irene Schmidtmann, Sami Eletr, Heinrich Wehrbein, Maximilian Moergel, Collin Jacobs
PURPOSE: The objective was to evaluate the diagnostic and prognostic value of three-dimensional (3D) cone beam computed tomography (CBCT) on information about the cleft and alignment of cleft neighboring teeth. MATERIALS AND METHODS: Panoramic X-rays, small-volume CBCTs, and study casts of 20 patients with a total of 22 alveolar clefts were analyzed prior to secondary bone grafting. Six maxillofacial surgeons and 6 orthodontists rated the following parameters: visibility of alveolar cleft expansion, position and probability of alignment of cleft neighbored teeth...
June 3, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28681247/impact-of-manual-control-point-selection-accuracy-on-automated-surface-matching-of-digital-dental-models
#14
Kathrin Becker, Benedict Wilmes, Chantal Grandjean, Dieter Drescher
OBJECTIVES: Treatment outcomes are frequently evaluated based on the superimposition of digital dental models. However, errors from surface matching may distort these findings. The aims of this study were (i) to develop a simulation unit to mimic point set registrations and (ii) to evaluate the impact and clinical relevance of manual landmark selection errors on registration accuracy. MATERIAL AND METHODS: Ten randomly selected dental casts were digitized using a 3D laser scanner, and were loaded by an in-house developed simulation unit (MATLAB R2014a)...
July 5, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28675541/novel-approach-to-maxillary-reconstruction-using-osteocutaneous-free-tissue-transfer-with-a-customized-stent
#15
Vivek R Varma, Yin Yiu, Meade Van Putten, Tiffany L Kessling, Enver Ozer, Amit Agrawal, Theodoros Teknos, Stephen Y Kang, Matthew O Old
BACKGROUND: Computer-guided 3D virtual planning and customized templates are novel and effective methods aiding maxillary reconstruction, particularly during osteocutaneous free tissue transfer of complex defects. However, virtual planning and modelling is often expensive. METHODS: We present a new method to reconstruct complex defects with a surgical stent designed from presurgical casts. We present 2 patients who underwent this technique. Reconstruction in both cases was aided by a surgical stent fashioned preoperatively to approximate the anatomic dimensions of the defect, guiding the shape and orientation of the flap during inset to aid in dental rehabilitation...
July 4, 2017: Head & Neck
https://www.readbyqxmd.com/read/28659050/inter-arch-digital-model-vs-manual-cast-measurements-accuracy-and-reliability
#16
Heikki Kiviahde, Lea Bukovac, Päivi Jussila, Paula Pesonen, Kirsi Sipilä, Aune Raustia, Pertti Pirttiniemi
OBJECTIVES: The purpose of this study was to evaluate the accuracy and reliability of inter-arch measurements using digital dental models and conventional dental casts. METHODS: Thirty sets of dental casts with permanent dentition were examined. Manual measurements were done with a digital caliper directly on the dental casts, and digital measurements were made on 3D models by two independent examiners. Intra-class correlation coefficients (ICC), a paired sample t-test or Wilcoxon signed-rank test, and Bland-Altman plots were used to evaluate intra- and inter-examiner error and to determine the accuracy and reliability of the measurements...
June 28, 2017: Cranio: the Journal of Craniomandibular Practice
https://www.readbyqxmd.com/read/28640827/the-application-of-multi-baseline-digital-close-range-photogrammetry-in-three-dimensional-imaging-and-measurement-of-dental-casts
#17
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
#18
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
#19
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...
July 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
#20
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
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