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https://www.readbyqxmd.com/read/28091875/the-effect-of-veneering-on-the-marginal-fit-of-cad-cam-generated-copy-milled-and-cast-metal-copings
#1
Sabit Melih Ates, Zeynep Yesil Duymus, Ipek Caglar, Bilal Hologlu
OBJECTIVE: This in vitro study investigated the marginal fit of metal and zirconia copings before and after veneering on dies with shoulder/chamfer (s/c) finish lines. MATERIALS AND METHODS: Using CAD/CAM, ten (n = 10) each s/c zirconia (NZ) copings and ten (n = 10) each s/c metal (MM) copings were generated. As controls, ten (n = 10) each s/c zirconia copings were copy-milled (ZZ) and ten (n = 10) each s/c metal copings were cast (CC). The vertical marginal discrepancy of the copings was measured at 20 predefined spots of the circular shoulder and chamfer finish lines in microns (μm) before and after a first and a second veneering firing using a stereomicroscope at ×40 magnification...
January 13, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28088710/short-range-shooting-distance-estimation-using-variable-pressure-sem-images-of-the-surroundings-of-bullet-holes-in-textiles
#2
Ruth Hinrichs, Paulo Ricardo Ost Frank, M A Z Vasconcellos
Modifications of cotton and polyester textiles due to shots fired at short range were analyzed with a variable pressure scanning electron microscope (VP-SEM). Different mechanisms of fiber rupture as a function of fiber type and shooting distance were detected, namely fusing, melting, scorching, and mechanical breakage. To estimate the firing distance, the approximately exponential decay of GSR coverage as a function of radial distance from the entrance hole was determined from image analysis, instead of relying on chemical analysis with EDX, which is problematic in the VP-SEM...
December 29, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28087282/short-term-perioperative-teriparatide-therapy-for-the-prevention-of-medication-related-osteonecrosis-of-the-jaw-a-randomized-controlled-preclinical-study-in-rats
#3
Mohammad Zandi, Arash Dehghan, Amirhossein Mohammadi-Mofrad, Payam Amini, Farshid Vahdatinia
OBJECTIVE: Dentoalveolar procedures in patients receiving bisphosphonates and other antiresorptive agents are associated with an increased risk of medication-related osteonecrosis of the jaw (MRONJ). The aim of present study was to evaluate the effects of perioperative teriparatide (TPD) therapy in prevention of MRONJ. SUBJECTS AND METHODS: Two protocols of TPD therapy were studied. For protocol A, 25 TPD-treated (AT) and 25 control (AC) rats received 5 weekly injection of 0...
December 19, 2016: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28087217/psychometric-properties-of-the-japanese-version-of-short-forms-of-the-pain-catastrophizing-scale-in-participants-with-musculoskeletal-pain-a-cross-sectional-study
#4
Tomohiko Nishigami, Akira Mibu, Katsuyoshi Tanaka, Yuh Yamashita, Akihisa Watanabe, Akihito Tanabe
BACKGROUND: The Pain Catastrophizing Scale (PCS) is a commonly used as measure of pain catastrophizing. The scale comprises 13 items related to magnification, rumination, and helplessness. To facilitate quick screening and to reduce participant's burden, the four-item and six-item short forms of the English version of the PCS were developed. The purpose of the present study was to evaluate the psychometric properties of a Japanese version of the short forms of PCS using a contemporary approach called Rasch analysis...
January 10, 2017: Journal of Orthopaedic Science: Official Journal of the Japanese Orthopaedic Association
https://www.readbyqxmd.com/read/28079363/fluorescence-development-of-latent-fingerprint-with-conjugated-polymer-nanoparticles-in-aqueous-colloidal-solution
#5
Hong Chen, Rong-Liang Ma, Yun Chen, Li-Juan Fan
Poly(p-phenylene vinylene) (PPV) nanoparticles in aqueous colloidal solution have been prepared via a modified Wessling method, with the addition of surfactant. The fluorescent colloidal solution was used as the developing solution to develop the fingerprints on different substrates. The developing process was accomplished simply by immersing the substrates into developing solution and then taking out, followed by rinsing with deionized water. The initial study about the fingerprints on the adhesive tapes showed that the developing solution is very effective in fluorescence developing on both fresh and aged visible fingerprints; and such effect was negligibly affected by treating the fingerprints with water or other organic solvents, whether before developing or after...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28077562/sensitive-and-inexpensive-digital-dna-analysis-by-microfluidic-enrichment-of-rolling-circle-amplified-single-molecules
#6
Malte Kühnemund, Iván Hernández-Neuta, Mohd Istiaq Sharif, Matteo Cornaglia, Martin A M Gijs, Mats Nilsson
Single molecule quantification assays provide the ultimate sensitivity and precision for molecular analysis. However, most digital analysis techniques, i.e. droplet PCR, require sophisticated and expensive instrumentation for molecule compartmentalization, amplification and analysis. Rolling circle amplification (RCA) provides a simpler means for digital analysis. Nevertheless, the sensitivity of RCA assays has until now been limited by inefficient detection methods. We have developed a simple microfluidic strategy for enrichment of RCA products into a single field of view of a low magnification fluorescent sensor, enabling ultra-sensitive digital quantification of nucleic acids over a dynamic range from 1...
January 10, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28076292/445-nm-diode-laser-assisted-debonding-of-self-ligating-ceramic-brackets
#7
Steffen Stein, Alexander Kleye, Michael Schauseil, Andreas Hellak, Heike Korbmacher-Steiner, Andreas Braun
OBJECTIVES: This study determined the influence of irradiation on aesthetic ceramic brackets with a novel 445-nm diode laser prior to debonding on the bracket failure mode. MATERIALS AND METHODS: Thirty ceramic brackets (In-Ovation® C, GAC) were standard-bonded to the oral and buccal planed and polished enamel surfaces of 15 caries-free human 3rd molars. Prior to study-blinded debonding, the brackets in the laser group were irradiated with the diode laser (SIROLaser Blue®, Sirona), while the irradiation was simulated within the conventional group...
January 11, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28069369/spatial-and-temporal-distributions-of-hexabromocyclododecanes-in-the-vicinity-of-an-expanded-polystyrene-material-manufacturing-plant-in-tianjin-china
#8
Hongkai Zhu, Kai Zhang, Hongwen Sun, Fei Wang, Yiming Yao
To investigate the environmental fate of 3 main hexabromocyclododecane diastereoisomers (α-, β-, and γ-HBCDs), samples from various environmental media, including outdoor settled dust, soil, sediment, plant tissues (holly, cypress and pine) and marine species (shrimp, crab and fish) were obtained around an expanded polystyrene material manufacturing plant in Tianjin, China. The 3 main HBCD diastereoisomers were detected with the total concentrations ranging from 328 to 31,752 ng/g dry weight (dw), 2.91-1730 ng/g dw, 23...
January 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28066614/the-role-of-bronchoscopy-in-the-diagnosis-of-early-lung-cancer-a-review
#9
REVIEW
Marco Andolfi, Rossella Potenza, Rosanna Capozzi, Valeria Liparulo, Francesco Puma, Kazuhiro Yasufuku
Lung cancer is the leading cause of cancer-related deaths worldwide with an overall 5-year survival rate of 17% after diagnoses. Indeed many patients tend to have a very poor prognosis, due to being diagnosed at an advanced stage. Conversely patients who are diagnosed at an early stage have a 5-year survival >70%, indicating that early detection of lung cancer is crucial to improve survival. Although flexible bronchoscopy is a relatively non-invasive procedure for patients suspected of having lung cancer, only 29% of carcinoma in situ (CIS) and 69% of microinvasive tumors were detectable using white light bronchoscopy (WLB) alone...
November 2016: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28060322/analysis-of-the-ambient-particulate-matter-induced-chromosomal-aberrations-using-an-in-vitro-system
#10
Isabelle R Miousse, Igor Koturbash, Marie-Cécile Chalbot, Martin Hauer-Jensen, Ilias Kavouras, Rupak Pathak
Exposure to particulate matter (PM) is a major world health concern, which may damage various cellular components, including the nuclear genetic material. To assess the impact of PM on nuclear genetic integrity, structural chromosomal aberrations are scored in the metaphase spreads of mouse RAW264.7 macrophage cells. PM is collected from ambient air with a high volume total suspended particles sampler. The collected material is solubilized and filtered to retain the water-soluble, fine portion. The particles are characterized for chemical composition by nuclear magnetic resonance (NMR) spectroscopy...
December 21, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28060073/variable-size-bead-layer-as-standard-reference-for-endothelial-microscopes
#11
Simona Tufo, Erica Prazzoli, Lorenzo Ferraro, Federica Cozza, Alessandro Borghesi, Silvia Tavazzi
PURPOSE: For morphometric analysis of the cell mosaic of corneal endothelium, checking accuracy and precision of instrumentation is a key step. In this study, a standard reference sample is proposed, developed to reproduce the cornea with its shape and the endothelium with its intrinsic variability in the cell size. METHODS: A polystyrene bead layer (representing the endothelium) was deposited on a lens (representing the cornea). Bead diameters were 20, 25, and 30 μm (fractions in number 55%, 30%, and 15%, respectively)...
February 2017: Cornea
https://www.readbyqxmd.com/read/28059835/donor-liver-small-droplet-macrovesicular-steatosis-is-associated-with-increased-risk-for-recipient-allograft-rejection
#12
Won-Tak Choi, Kuang-Yu Jen, Dongliang Wang, Mehdi Tavakol, John P Roberts, Ryan M Gill
Although donor livers with <30% large droplet macrovesicular steatosis (MaS) and/or small droplet MaS (irrespective of percentage) are considered safe to use, this consensus is based on variable definitions of MaS subtypes and/or without a reproducible scoring system. We analyzed 134 donor liver biopsies from allografts transplanted at University of California at San Francisco between 2000 and 2015 to determine whether large and/or small droplet MaS is a risk factor for poor outcomes. Large droplet MaS was defined as a fat droplet occupying greater than one half of an individual hepatocyte, with nuclear displacement, and scored as the percentage of total parenchymal area replaced by large fat droplets on ×40 magnification...
January 4, 2017: American Journal of Surgical Pathology
https://www.readbyqxmd.com/read/28050507/shear-bond-strength-of-ceramic-brackets-with-different-base-designs-comparative-in-vitro-study
#13
Mohd Younus Ansari, Deepak K Agarwal, Ankur Gupta, Preeti Bhattacharya, Juhi Ansar, Ravi Bhandari
INTRODUCTION: Knowledge about the Shear Bond Strength (SBS) of ceramic brackets with different base design is essential as it affects bond strength to enamel. AIM: The aim of the present study was to evaluate and compare the effect of base designs of different ceramic brackets on SBS, and to determine the fracture site after debonding. MATERIALS AND METHODS: Four groups of ceramic brackets and one group of metal brackets with different base designs were used...
November 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28048751/mo-de-bra-04-hands-on-fluoroscopy-safety-training-with-real-time-patient-and-staff-dosimetry
#14
M Vanderhoek, N Bevins
PURPOSE: Fluoroscopically guided interventions (FGI) are routinely performed across many different hospital departments. However, many involved staff members have minimal training regarding safe and optimal use of fluoroscopy systems. We developed and taught a hands-on fluoroscopy safety class incorporating real-time patient and staff dosimetry in order to promote safer and more optimal use of fluoroscopy during FGI. METHODS: The hands-on fluoroscopy safety class is taught in an FGI suite, unique to each department...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048040/mo-fg-202-01-a-fast-yet-sensitive-epid-based-real-time-treatment-verification-system
#15
M Ahmad, H Nourzadeh, B Neal, W Watkins, J Siebers
PURPOSE: To create a real-time EPID-based treatment verification system which robustly detects treatment delivery and patient attenuation variations. METHODS: Treatment plan DICOM files sent to the record-and-verify system are captured and utilized to predict EPID images for each planned control point using a modified GPU-based digitally reconstructed radiograph algorithm which accounts for the patient attenuation, source energy fluence, source size effects, and MLC attenuation...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047771/su-g-tep3-07-on-the-development-of-mechano-biological-assessment-of-leukemia-cells-using-optical-tweezers
#16
E Brost, J Brooks, J Piepenburg, S Chakraborty, T Das, A Green, Y Watanabe, S Hui
PURPOSE: Patients with BCR-ABL (Ph +ve) acute lymphoblastic leukemia are at very high risk of relapse and mortality. In line with the NIH mission to understand the physical and biological processes, we seek to report mechano-biological method to assessment and distinguish treated/untreated leukemia cells. METHODS: BCR-ABL leukemia cell populations and silica microspheres were trapped in a 100x magnification optical trapping system (λ=660 nm, 70 mW). Light refracted through the trapped sample was collected in the back focal plane by a quadrant detector to measure the positions of individual cells...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047747/we-ab-202-09-feasibility-and-quantitative-analysis-of-4dct-based-high-precision-lung-elastography
#17
K Hasse, J Neylon, D Low, A Santhanam
PURPOSE: The purpose of this project is to derive high precision elastography measurements from 4DCT lung scans to facilitate the implementation of elastography in a radiotherapy context. METHODS: 4DCT scans of the lungs were acquired, and breathing stages were subsequently registered to each other using an optical flow DIR algorithm. The displacement of each voxel gleaned from the registration was taken to be the ground-truth deformation. These vectors, along with the 4DCT source datasets, were used to generate a GPU-based biomechanical simulation that acted as a forward model to solve the inverse elasticity problem...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047710/su-c-209-01-validation-of-the-simulated-detectability-metric-g-rod-using-the-experimental-generalized-measured-relative-object-detectability-metric-gm-rod
#18
M Russ, C Ionita, D Bednarek, S Rudin
PURPOSE: The Generalized Relative Object Detectability (G-ROD) family of ideal observer metrics are a well-characterized set of task-based metrics used for quantitatively comparing imaging systems that include the detector, focal spot geometry and scatter characteristics on the basis of system abilities in imaging a given simulated object. The G-ROD metric takes the integral over spatial frequencies of the Fourier transform of a simulated object function weighted with the detector generalized DQE (GDQE), divided by the comparable integral for another detector...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047585/su-d-206-06-task-specific-optimization-of-scintillator-thickness-for-cmos-detector-based-cone-beam-breast-ct
#19
S Vedantham, S Shrestha, L Shi, G Vijayaraghavan, A Karellas
PURPOSE: To optimize the cesium iodide (CsI:Tl) scintillator thickness in a complimentary metal-oxide semiconductor (CMOS)-based detector for use in dedicated cone-beam breast CT. METHODS: The imaging task considered was the detection of a microcalcification cluster comprising six 220µm diameter calcium carbonate spheres, arranged in the form of a regular pentagon with 2 mm spacing on its sides and a central calcification, similar to that in ACR-recommended mammography accreditation phantom, at a mean glandular dose of 4...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047550/su-g-iep2-05-effect-of-localizer-type-and-patient-off-centering-on-ct-radiation-dose-with-use-of-automatic-tube-current-modulation
#20
C Ruan, A Sodickson, L Hamberg
PURPOSE: Apparent patient size in CT localizers varies with localizer type and patient positioning, resulting in variation in effective mAs as guided by Tube Current Modulation (TCM). Our aim was to investigate the effects of vertical off-centering on CTDI-vol when using different localizer types and TCM strengths. METHODS: A CTDI body phantom was scanned using an abdominal protocol with three TCM strengths (Siemens Definition AS40, CAREDose4D; very weak, average, very strong)...
June 2016: Medical Physics
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