keyword
https://read.qxmd.com/read/38439366/dual-wavelength-fourier-ptychographic-microscopy-for-topographic-measurement
#21
JOURNAL ARTICLE
Qun Hao, Chao Lin, Yao Hu, Qian Yu, Jiahang Lv, Chuanjian Zheng, Shaohui Zhang, Chuheng Xu, Ci Song
Topographic measurements of micro- or nanostructures are essential in cutting-edge scientific disciplines such as optical communications, metrology, and structural biology. Despite the advances in surface metrology, measuring micron-scale steps with wide field of view (FOV) and high-resolution remains difficult. This study demonstrates a dual-wavelength Fourier ptychographic microscopy for high-resolution topographic measurement across a wide FOV using an aperture scanning structure. This structure enables the capture of a three-dimensional (3D) sample's scattered field with two different wavelength lasers, thus allowing the axial measurement range growing from nano- to micro-scale with enhanced lateral resolution...
February 12, 2024: Optics Express
https://read.qxmd.com/read/38439316/deep-learning-framework-for-three-dimensional-surface-reconstruction-of-object-of-interest-in-photoacoustic-tomography
#22
JOURNAL ARTICLE
Sun Zheng, Li Lu, Hou Yingsa, Sun Meichen
Photoacoustic tomography (PAT) is a non-ionizing hybrid imaging technology of clinical importance that combines the high contrast of optical imaging with the high penetration of ultrasonic imaging. Two-dimensional (2D) tomographic images can only provide the cross-sectional structure of the imaging target rather than its overall spatial morphology. This work proposes a deep learning framework for reconstructing three-dimensional (3D) surface of an object of interest from a series of 2D images. It achieves end-to-end mapping from a series of 2D images to a 3D image, visually displaying the overall morphology of the object...
February 12, 2024: Optics Express
https://read.qxmd.com/read/38435812/design-and-use-of-an-ex-vivo-peripheral-simulating-bioreactor-system-for-pharmacokinetic-analysis-of-a-drug-coated-stent
#23
JOURNAL ARTICLE
Danyi Chen, Colin Krinsky, Mollie Phillips, Catherine Allred, Ava Khan, Linda B Liu, Uwe Christians, Saami K Yazdani
Currently, there are no ex vivo systems that can model the motion of peripheral arteries and allow for the evaluation of pharmacokinetics (PK) of endovascular devices. The objective of this study was to develop a novel peripheral simulating bioreactor system to evaluate drug pharmacokinetics of stents. We utilized 3D-printed and off-the-shelf components to construct a peripheral-simulating bioreactor system capable of mimicking the motion of peripheral arteries. Servo motors were primarily used to shorten/elongate, twist, and bend explanted porcine carotid arteries...
March 2024: Bioengineering & Translational Medicine
https://read.qxmd.com/read/38435752/development-of-curcumin-and-turmerone-loaded-solid-lipid-nanoparticle-for-topical-delivery-optimization-characterization-and-skin-irritation-evaluation-with-3d-tissue-model
#24
JOURNAL ARTICLE
Beyza Sümeyye Aydin, Ali Asram Sagiroglu, Dilek Ozturk Civelek, Mustafa Gokce, Fatemeh Bahadori
BACKGROUND: Curcuma longa L., commonly known as turmeric, is renowned for its therapeutic benefits attributed to bioactive compounds, namely curcumin (Cur) and aromatic turmerone (Tur), present in its rhizome. These compounds exhibit diverse therapeutic properties, including anti-inflammatory, antioxidant, and anti-tumor effects. However, the topical application of these compounds has a significant potential for inducing skin irritation. This study focuses on formulating solid lipid nanoparticle (SLN) carriers encapsulating both Cur and Tur for reduced irritation and enhanced stability...
2024: International Journal of Nanomedicine
https://read.qxmd.com/read/38434883/impact-of-synthesis-parameters-upon-the-electronic-structure-in-pvd-deposited-cd-x-zn-1-x-o-composite-thin-films-an-xps-xanes-investigation
#25
JOURNAL ARTICLE
Arkaprava Das, Ewa Partyka-Jankowska, Marcin Zając, Axel Hemberg, Carla Bittencourt
The impact of different synthesis parameters, such as thickness, postsynthesis annealing temperature, and oxygen gas flow rate, upon the electronic structure is discussed in detail in the present experimental investigation. X-ray photoelectron spectroscopy (XPS) and X-ray absorption near-edge structure (XANES) spectroscopy techniques are used to evaluate the surface electronic properties along with the presence and stability of the CdO2 surface oxide in Cd x Zn1- x O ( x = 0.4) composite thin films. The thin films were synthesized with varying thicknesses using a Cd0...
February 27, 2024: ACS Omega
https://read.qxmd.com/read/38431556/micro-computed-tomographic-evaluation-of-the-shaping-ability-of-three-nickel-titanium-rotary-systems-in-the-middle-mesial-canal-of-mandibular-first-molars-an-ex-vivo-study-based-on-3d-printed-tooth-replicas
#26
JOURNAL ARTICLE
Qi Zhu, Chao Liu, Bingbing Bai, Fan Pei, Ying Tang, Weijian Song, Xiuchun Chen, Yongchun Gu
BACKGROUND: The preparation of the middle mesial (MM) canal of mandibular molars represents a challenge because it is often curved, narrow, and close to the root concave. The purpose of this study was to evaluate the ex vivo shaping ability of 3 nickel-titanium (NiTi) rotary systems in the MM canal using 3D printed resin tooth replicas. METHODS: A permanent mandibular first molar with a MM canal was acquired from a pool of extracted teeth and reproduced by a 3D printer...
March 2, 2024: BMC Oral Health
https://read.qxmd.com/read/38431311/biofilm-formation-of-the-food-spoiler-brochothrix-thermosphacta-on-different-industrial-surface-materials-using-a-biofilm-reactor
#27
JOURNAL ARTICLE
Antoine Gaillac, Claire Gourin, Laurence Dubreil, Romain Briandet, Hervé Prévost, Emmanuel Jaffrès
Brochothrix thermosphacta is considered as a major food spoiler bacteria. This study evaluates biofilm formation by B. thermosphacta CD337(2) - a strong biofilm producer strain - on three food industry materials (polycarbonate (PC), polystyrene (PS), and stainless steel (SS)). Biofilms were continuously grown under flow at 25 °C in BHI broth in a modified CDC biofilm reactor. Bacterial cells were enumerated by plate counting, and biofilm spatial organization was deciphered by combining confocal laser scanning microscopy and image analysis...
June 2024: Food Microbiology
https://read.qxmd.com/read/38429216/influence-of-printing-orientation-on-mechanical-properties-of-aged-3d-printed-restorative-resins
#28
JOURNAL ARTICLE
Cristina Espinar, María M Pérez, Rosa Pulgar, Alberto Leon-Cecilla, Modesto T López-López, Alvaro Della Bona
OBJECTIVE: To evaluate the influence of printing orientation on flexural strength (σf) and elastic modulus (E) of different 3D printing dental restorative resins. METHODS: Bar-shaped specimens (n = 20) were fabricated from two SLA-printed resins (FT- Formlabs Temporary, and FP- Formlabs Permanent) and two DLP-printed resins (DFT- Detax Freeprint Temp, and GCT- GC Temporary) using two building orientations (0º and 90º). The 3D-printed structures were aged (14 d) before submitted to three-point bending in 37ºC distilled water at a crosshead speed of 1...
February 29, 2024: Dental Materials
https://read.qxmd.com/read/38417862/comparison-of-wear-and-marginal-fitness-of-3d-printed-deciduous-molar-crowns-an-in-vitro-study
#29
JOURNAL ARTICLE
Bin Lei, Huacui Xiong, Ke Chen
This study aimed to evaluate the wear resistance of primary tooth enamel and 3 kinds of 3D printing materials and to compare the marginal fitness and internal suitability of prefabricated all-ceramic crowns, computer-aided design/manufacturing (CAD/CAM) all-ceramic crowns, and three 3D-printed deciduous molar crowns. Multifunctional friction wear testing machine was used to image the wear surface of the sample and calculate the maximum wear depth and volume loss value of each sample. The internal fit evaluation used the silicon replica method, The four points were measured using scanning electron microscopy (SEM)...
February 29, 2024: Dental Materials Journal
https://read.qxmd.com/read/38412900/occlusal-caries-detection-and-monitoring-using-a-3d-intraoral-scanner-system-an-in-vivo-assessment
#30
JOURNAL ARTICLE
Stavroula Michou, Angeliki Tsakanikou, Azam Bakhshandeh, Kim R Ekstrand, Christos Rahiotis, Ana R Benetti
OBJECTIVE: To assess the agreement in detecting and monitoring occlusal caries over thirty months using conventional visual and radiographic assessment and an intraoral scanner system which supports automated caries scoring. METHODS: Ninety-one young participants aged 12-19 years were included in the study. All occlusal surfaces were examined visually, radiographically (when indicated), and scanned with the TRIOS 4 intraoral scanner. TRIOS Patient Monitoring software (vers...
February 25, 2024: Journal of Dentistry
https://read.qxmd.com/read/38408132/evaluation-on-surface-characteristics-accuracy-and-dimensional-stability-of-tooth-preparation-dies-fabricated-by-conventional-gypsum-and-3d-printed-workflows
#31
JOURNAL ARTICLE
Xue-Lu Tong, Chao-Yi Ma, Na Yu, Hou-Qi Zhou, Fa-Bing Tan
PURPOSE: To evaluate the surface characteristics, accuracy (trueness and precision), and dimensional stability of tooth preparation dies fabricated using conventional gypsum and direct light processing (DLP), stereolithography (SLA), and polymer jetting printing (PJP) techniques. MATERIALS AND METHODS: Gypsum preparation dies were replicated according to the reference data and imported into DLP, SLA, and PJP printers, and the test data were obtained by scanning after 0, 1, 3, 7, 14, 28, and 42 days...
February 26, 2024: International Journal of Prosthodontics
https://read.qxmd.com/read/38408041/ultra-dense-motion-capture-an-exploratory-full-automatic-approach-for-dense-tracking-of-breast-motion-in-4d
#32
JOURNAL ARTICLE
Qi-Long Liu, Kit-Lun Yick, Yue Sun, Joanne Yip
Understanding the dynamic deformation pattern and biomechanical properties of breasts is crucial in various fields, including designing ergonomic bras and customized prostheses, as well as in clinical practice. Previous studies have recorded and analyzed the dynamic behaviors of the breast surface using 4D scanning, which provides a sequence of 3D meshes during movement with high spatial and temporal resolutions. However, these studies are limited by the lack of robust and automated data processing methods which result in limited data coverage or error-prone analysis results...
2024: PloS One
https://read.qxmd.com/read/38405968/automated-3d-landmarking-of-the-skull-a-novel-approach-for-craniofacial-analysis
#33
Franziska Wilke, Harold Matthews, Noah Herrick, Nichole Dopkins, Peter Claes, Susan Walsh
Automatic dense 3D surface registration is a powerful technique for comprehensive 3D shape analysis that has found a successful application in human craniofacial morphology research, particularly within the mandibular and cranial vault regions. However, a notable gap exists when exploring the frontal aspect of the human skull, largely due to the intricate and unique nature of its cranial anatomy. To better examine this region, this study introduces a simplified single-surface craniofacial bone mask comprising 9,999 quasi-landmarks, which can aid in the classification and quantification of variation over human facial bone surfaces...
February 12, 2024: bioRxiv
https://read.qxmd.com/read/38405740/immuno-scanning-electron-microscopy-of-islet-primary-cilia
#34
Sanja Sviben, Alexander J Polino, Isabella Melena, Jing W Hughes
The definitive demonstration of protein localization on primary cilia has been a challenge for cilia biologists. Primary cilia are solitary thread-like projections that contain specialized protein composition, but as the ciliary structure overlays the cell membrane and other cell parts, the identity of ciliary proteins are difficult to ascertain by conventional imaging approaches like immunofluorescence microscopy. Surface scanning electron microscopy combined with immuno-labeling (immuno-SEM) bypasses some of these indeterminacies by unambiguously showing protein expression in the context of the 3D ultrastructure of the cilium...
February 16, 2024: bioRxiv
https://read.qxmd.com/read/38405626/a-consistent-methodology-for-forensic-photogrammetry-scanning-of-human-remains-using-a-single-handheld-dslr-camera
#35
JOURNAL ARTICLE
Zsolt Ujvári, Máté Metzger, Gergely Gárdonyi
UNLABELLED: Due to increasingly capable algorithms and more available processing power, photogrammetry is becoming a simple, cheap, and accurate alternative to 3D optical surface scanning. With adequate application, it can be a swift documentation technique for reconstructing the geometry and body surface of deceased persons in autopsies or other forensic medical examinations. Sufficiently easy and swift 3D documentation techniques may allow 3D imaging technologies to become part of the daily routine of any forensic medical examiner or other medical personnel...
December 2023: Forensic Sciences Research
https://read.qxmd.com/read/38404784/optimization-of-3d-printing-parameters-in-polylactic-acid-bio-metamaterial-under-cyclic-bending-loading-considering-fracture-features
#36
JOURNAL ARTICLE
Ali Dadashi, Mohammad Azadi
3D printing has become a crucial additive manufacturing technique with the applications in various industries. Fused deposition modeling (FDM) is a common additive manufacturing process that offers considerable flexibility in the component fabrication through multiple parameters, which strongly influence the properties of the produced parts. This study focused on the impact of different printing parameters on the fatigue behavior of polylactic acid (PLA). The standard samples were 3D-printed with varying speed (5, 10, and 15 mm/s), print temperature (180, 210, and 240 °C), and nozzle diameter (0...
February 29, 2024: Heliyon
https://read.qxmd.com/read/38404338/rigid-alignment-method-for-secondary-analyses-of-optical-coherence-tomography-volumes
#37
JOURNAL ARTICLE
Andrew Cornelio, Ana Collazo Martinez, Hanzhang Lu, Craig Jones, Amir H Kashani
Optical coherence tomography (OCT) provides micron level resolution of retinal tissue and is widely used in ophthalmology. Millions of pre-existing OCT images are available from research and clinical databases. Analysis of this data often requires or can benefit significantly from image registration and reduction of speckle noise. One method of reducing noise is to align and average multiple OCT scans together. We propose to use surface feature information and whole volume information to create a novel and simple pipeline that can rigidly align, and average multiple previously acquired 3D OCT volumes from a commercially available OCT device...
February 1, 2024: Biomedical Optics Express
https://read.qxmd.com/read/38404301/multibeam-continuous-axial-scanning-two-photon-microscopy-for-in-vivo-volumetric-imaging-in-mouse-brain
#38
JOURNAL ARTICLE
Mitsutoshi Ataka, Kohei Otomo, Ryosuke Enoki, Hirokazu Ishii, Motosuke Tsutsumi, Yuichi Kozawa, Shunichi Sato, Tomomi Nemoto
This study presents an alternative approach for two-photon volumetric imaging that combines multibeam lateral scanning with continuous axial scanning using a confocal spinning-disk scanner and an electrically focus tunable lens. Using this proposed system, the brain of a living mouse could be imaged at a penetration depth of over 450 μm from the surface. In vivo volumetric Ca2+ imaging at a volume rate of 1.5 Hz within a depth range of 130-200 μm, was segmented with an axial pitch of approximately 5-µm and revealed spontaneous activity of neurons with their 3D positions...
February 1, 2024: Biomedical Optics Express
https://read.qxmd.com/read/38403847/denture-relining-using-digital-replication-method-a-dental-technique
#39
JOURNAL ARTICLE
Mohammed M Gad, Haidar Alalawi, Faisal D Al-Qarni, Fahad A Al-Harbi
The aim of this report was to digitize traditional denture relining using a digital duplication method, in addition to assessing the wear resistance of three-dimensional (3D) printed denture teeth. A complete denture was relined using light body impression. The denture with impression was scanned yielding a standard tessellation language file that was designed to print the denture base and teeth. The printed teeth were fitted into the sockets of the printed denture base and then bonded using auto-polymerized acrylic resins, followed by finishing and polishing...
February 25, 2024: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://read.qxmd.com/read/38403087/application-of-3d-printing-technology-for-the-development-of-dose-adjustable-geriatric-and-pediatric-formulation-of-celecoxib
#40
JOURNAL ARTICLE
Henis Patel, Vishvesh Raje, Paulina Maczko, Ketan Patel
Developing safe and effective formulations for the geriatric and pediatric population is a challenging task due to issues of swallowability and palatability. The lack of standardized procedures for pediatric formulations further complicates the process. Manipulating adult formulations for children can lead to suboptimal efficacy and safety concerns. To overcome these challenges, minitablets or spinklets are preferred for the geriatric and pediatric population due to their smaller size and flexible dose adjustment...
February 23, 2024: International Journal of Pharmaceutics
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