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https://www.readbyqxmd.com/read/28214537/biomechanical-behavior-of-endodontically-treated-premolars-using-different-preparation-designs-and-cad-cam-materials
#1
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Thaís Yumi Umeda Suzuki, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVES: To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. METHODS: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n=8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2...
February 15, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28214119/persistent-organic-pollutants-in-the-olifants-river-basin-south-africa-bioaccumulation-and-trophic-transfer-through-a-subtropical-aquatic-food-web
#2
Vera Verhaert, Nadine Newmark, Wendy D'Hollander, Adrian Covaci, Wynand Vlok, Victor Wepener, Abraham Addo-Bediako, Antoinette Jooste, Johannes Teuchies, Ronny Blust, Lieven Bervoets
This study investigates the trophic transfer of persistent organic pollutants (POPs: PCBs, PBDEs, OCPs and PFASs) in the subtropical aquatic ecosystem of the Olifants River Basin (South Africa) by means of trophic magnification factors (TMFs). Relative trophic levels were determined by stable isotope analysis. POP levels in surface water, sediment and biota were low. Only ∑DDTs levels in fish muscle (<LOQ-61ng/g ww) were comparable or higher than values from other temperate and tropical regions. Significant positive relationships between relative trophic level and PCB, DDT and HCH concentrations were observed so trophic levels play an important role in the movement of contaminants through the food web...
February 14, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28214009/trophic-magnification-of-dechlorane-plus-in-the-marine-food-webs-of-fildes-peninsula-in-antarctica
#3
Guangshui Na, Yao Yao, Hui Gao, Ruijing Li, Linke Ge, Ivan A Titaley, Lisandra Santiago-Delgado, Staci L Massey Simonich
The food web composition, assimilation efficiency of Dechlorane Plus (DP) in food web components, and even extrinsic conditions can affect the trophic biomagnification potentials of DP isomers in food webs. Antarctica ecological system is characterized by the presence of few consumers and simple trophic levels (TLs), which are crucial in discussing the behavior of contaminants. To assess the biomagnification potential of DP in the Antarctic food web, nine representative species were sampled and analyzed from the Fildes Peninsula...
February 14, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28212983/acircularity-index-and-axis-ratio-of-the-foveal-avascular-zone-in-diabetic-eyes-and-healthy-controls-measured-by-optical-coherence-tomography-angiography
#4
Brian D Krawitz, Shelley Mo, Lawrence S Geyman, Steven A Agemy, Nicole K Scripsema, Patricia M Garcia, Toco Y P Chui, Richard B Rosen
Given the complexity of the current system used to stage diabetic retinopathy (DR) and the risks and limitations associated with intravenous fluorescein angiography (IVFA), noninvasive quantification of DR severity is desirable. We examined the utility of acircularity index and axis ratio of the foveal avascular zone (FAZ), metrics that can noninvasively quantify the severity of diabetic retinopathy without the need for axial length to correct for individual retinal magnification. A retrospective review was performed of type 2 diabetics and age-matched controls imaged with optical coherence tomography angiography (OCTA)...
February 14, 2017: Vision Research
https://www.readbyqxmd.com/read/28209509/the-raptor-visual-system-an-update
#5
J González-Martín-Moro, J L Hernández-Verdejo, A Clement-Corral
OBJECTIVE: Diurnal birds of prey (raptors) are considered the group of animals with highest visual acuity (VA). The purpose of this work is to review all the information recently published about the visual system of this group of animals. MATERIAL AND METHODS: A bibliographic search was performed in PubMed. The algorithm used was (raptor OR falcon OR kestrel OR hawk OR eagle) AND (vision OR «visual acuity» OR eye OR macula OR retina OR fovea OR «nictitating membrane» OR «chromatic vision» OR ultraviolet)...
February 13, 2017: Archivos de la Sociedad Española de Oftalmología
https://www.readbyqxmd.com/read/28209389/physical-stability-of-highly-concentrated-injectable-drugs-solutions-used-in-intensive-care-units
#6
M Closset, J D Hecq, L Soumoy, J Simar, E Gonzalez, L Charlet, C Declave, P Gillet, L Galanti
BACKGROUND: The intensive care department of the institution use drug solutions within higher concentration to avoid fluid overload. The purpose of the study is to prove the physical stability of different injectable drugs within high concentration (amiodarone 25mg/mL, isosorbide 0.60mg/mL, lorazepam 0.16mg/mL, noradrenalin 0.120 and 0.240mg/mL, salbutamol 0.06mg/mL and sodium valproate 12mg/mL) to ensure the patients safety. METHODS: Five of 30 or 50mL polypropylene syringes were prepared for each solution under aseptic conditions and stored at room temperature...
February 13, 2017: Annales Pharmaceutiques Françaises
https://www.readbyqxmd.com/read/28209008/effect-of-resin-bonded-luting-agents-influencing-marginal-discrepancy-in-all-ceramic-complete-veneer-crowns
#7
Dhanraj Ganapathy, Anusha Sathyamoorthy, Hemalatha Ranganathan, Karthikeyan Murthykumar
INTRODUCTION: Marginal discrepancy severely affects the long term success of All ceramic complete veneer crowns. The precise role of resin luting agents influencing this phenomenon needs to be explored further. AIM: To estimate and compare the marginal discrepancy in CAD/CAM processed All ceramic complete veneer crowns prior and following luting with resin bonded luting agents. MATERIALS AND METHODS: Extracted human maxillary first premolars were randomly allocated into four groups of 27 samples each Viz...
December 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28207758/an-improved-schlieren-method-for-measurement-and-automatic-reconstruction-of-the-far-field-focal-spot
#8
Zhengzhou Wang, Bingliang Hu, Qinye Yin
The schlieren method of measuring far-field focal spots offers many advantages at the Shenguang III laser facility such as low cost and automatic laser-path collimation. However, current methods of far-field focal spot measurement often suffer from low precision and efficiency when the final focal spot is merged manually, thereby reducing the accuracy of reconstruction. In this paper, we introduce an improved schlieren method to construct the high dynamic-range image of far-field focal spots and improve the reconstruction accuracy and efficiency...
2017: PloS One
https://www.readbyqxmd.com/read/28197397/timing-considerations-on-the-shear-bond-strength-of-orthodontic-brackets-after-topical-fluoride-varnish-applications
#9
Gianguido Cossellu, Valentina Lanteri, Andrea Butera, Nicola Laffi, Alberto Merlini, Giampietro Farronato
OBJECTIVES: To assess the best temporal association between the application of a fluoride varnish on enamel and bonding procedures. MATERIALS AND METHODS: Eighty mandibular bovine incisors were used. Teeth were divided into 4 groups (20 per group); Groups 1-3 were treated with fluoride varnish (Fluor Protector, Ivoclar Vivadent, Schaan, Liechtenstein), and Group 4 served as control with no pretreatment. Tooth were stored in deionized water (37°C) and subjected to thermal cycling for 400 (Group 1), 800 (Group 2), and 2500 (Group 3) cycles corresponding, respectively, to 15, 30, and 90 days in order to simulate the three different timing of bracket bonding...
January 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28195497/incisor-and-molar-overjet-arch-contraction-and-molar-relationship-in-the-mixed-dentition-in-repaired-complete-unilateral-cleft-lip-and-palate-a-qualitative-and-quantitative-appraisal
#10
Suteeta Disthaporn, Sunjay Suri, Bruce Ross, Bryan Tompson, Diogenes Baena, David Fisher, Wendy Lou
OBJECTIVE: To compare the mixed dentition incisor and molar overjet, severity of contraction of the dental arch, and the sagittal molar relationship on the cleft side vs the noncleft side in children with repaired complete unilateral cleft of the lip and palate (UCLP). MATERIALS AND METHODS: Orthodontic records taken prior to orthodontic preparation for alveolar bone grafting were screened to select study casts from patients with nonsyndromic repaired complete UCLP who did not have mandibular skeletal or dental asymmetry...
February 14, 2017: Angle Orthodontist
https://www.readbyqxmd.com/read/28190573/stable-sulfur-isotopes-identify-habitat-specific-foraging-and-mercury-exposure-in-a-highly-mobile-fish-community
#11
Meghan K Carr, Timothy D Jardine, Lorne E Doig, Paul D Jones, Lalita Bharadwaj, Brett Tendler, John Chételat, Pete Cott, Karl-Erich Lindenschmidt
Tracking the uptake and transfer of toxic chemicals, such as mercury (Hg), in aquatic systems is challenging when many top predators are highly mobile and may therefore be exposed to chemicals in areas other than their location of capture, confounding interpretation of bioaccumulation trends. Here we show how the application of a less commonly used ecological tracer, stable sulfur isotope ratios ((34)S/(32)S, or δ(34)S), in a large river-delta-lake complex in northern Canada allows differentiation of resident from migrant fishes, beyond what was possible with more conventional (13)C/(12)C and (15)N/(14)N measurements...
February 10, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28188384/the-spoon-test-a-valid-and-reliable-bedside-test-to-assess-sudomotor-function
#12
Ramesh K Khurana, Colin Russell
OBJECTIVE: To establish the validity of bedside sudomotor tests in a controlled prospective study. METHODS: Five different tests were used to assess presence of sweating at seven bilaterally symmetrical body loci, namely, examination with the unaided eye, visualization with light reflection, magnification with an ophthalmoscope, palpation of skin for slickness, and gliding the back of a spoon over the skin to detect friction. Sensitivity and specificity of these bedside tests were compared with the thermoregulatory sweat test in 130 subjects with generalized body sweating and 16 patients with complete anhidrosis...
February 10, 2017: Clinical Autonomic Research: Official Journal of the Clinical Autonomic Research Society
https://www.readbyqxmd.com/read/28186862/comparison-of-conventional-syringe-canalbrush-endoactivator-photon-induced-photoacoustic-streaming-and-manual-instrumentation-in-removing-orange-brown-precipitate-an-in-vitro-study
#13
Mehmet Burak Guneser, Asiye Nur Dincer, Dilara Arslan
OBJECTIVE: The aim of this in vitro study was to compare the various techniques for removing precipitate formed after irrigation with sodium hypochlorite (NaOCl) and chlorhexidine (CHX). BACKGROUND DATA: It is still unclear whether different irrigant activation systems can effectively remove precipitate that is firmly attached to the root canal walls. METHODS: Eighty-two extracted single-rooted human teeth were instrumented by using the ProTaper rotary system...
February 10, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28182065/comparative-evaluation-of-canal-cleaning-ability-of-various-rotary-endodontic-filesin-apical-third-a-scanning-electron-microscopic-study
#14
Ganesh Ranganath Jadhav, Priya Mittal, Anish Kulkarni, Shibli Syed, Ravikiran Bagul, Saina Elahi, Dheeraj Kalra
BACKGROUND: The purpose of this study was to evaluate the canal cleaning ability of three novel endodontic rotary instruments and compare with ProTaper files as a control in apical third of root canals under scanning electron microscopy (SEM). MATERIALS AND METHODS: Eighty freshly extracted mandibular premolars were selected according to inclusion criteria. Buccal cusp tips were ground to ensure having a flat coronal reference point with a total tooth length of 16 mm for all samples...
November 2016: Dental Research Journal
https://www.readbyqxmd.com/read/28182040/the-effect-of-acrylate-based-dental-adhesive-solvent-content-on-microleakage-in-composite-restorations
#15
Mahboubeh Mirzakhani, Sayed Mostafa Mousavinasab, Mohammad Atai
BACKGROUND: This study aimed to evaluate the effect of different percentages of ethanol solvent of an experimental methacrylate-based dentin bonding agent containing polyhedral oligomeric silsesquioxanes (POSS) on the microleakage of resin composite restorations. MATERIALS AND METHODS: In this experimental study, 42 extracted human premolar teeth used and 84 standard Class V cavities were prepared on the buccal and lingual surfaces of the teeth. The teeth were divided into 6 groups of 7...
November 2016: Dental Research Journal
https://www.readbyqxmd.com/read/28179200/laparoscopic-management-of-abdomininal-pregnancy
#16
Francesco Cosentino, Cristiano Rossitto, Luigi Carlo Turco, Salvatore Gueli Alletti, Carmine Vascone, Lavinia Di Meglio, Giovanni Scambia, Mario Malzoni
CASE REPORT OBJECTIVE: To show the surgical management in laparoscopy of a particular localization of an extra-uterine pregnancy misunderstood until 12 week of EG complicated by hemoperitoneum and abortion. BACKGROUND: The prevalence of ectopic pregnancy among women who go to an emergency department with first trimester bleeding, pain, or both ranges from 1 to 16 percent [1]. The most common localization of ectopic pregnancy are the Fallopian tubes while abdominal pregnancy represent at least 1 percent of extra-uterine pregnancies...
February 4, 2017: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/28178105/socket-preservation-using-a-biomimetic-nanostructured-matrix-and-atraumatic-surgical-extraction-technique
#17
Marco Mozzati, Giorgia Gallesio, Giorgio Staiti, Giovanna Iezzi, Adriano Piattelli, Carmen Mortellaro
OBJECTIVE: The aim of the present study was to evaluate the efficacy of biomimetic composite bone substitute composed of equine collagen I and Mg-hydroxyapatite in improving socket preservation after tooth extraction in humans. METHODS: Thirty-two patients were subjected to a single tooth extraction, performed without elevation of the full-thickness flap. In each patient, socket was grafted with the bone substitute and specimens were retrieved 2 months after surgery and processed for histological observations...
February 7, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28177333/high-definition-video-telescopic-rhinoplasty
#18
I Tasca, G Ceroni Compadretti, C Romano
Optical magnification has become an essential tool in rhinologic practice, especially following the popularisation of endoscopic procedures for nasal sinus surgery. We describe the use of VITOM(®) technology in rhinoplasty, which to our knowledge has not been reported in the international literature to date. This approach to rhinoplasty markedly improves visualisation of the surgical field, thereby improving the understanding of the procedures and enhancing the teaching environment. Since VITOM(®) technology works by combining the telescope with a standard endoscopic setting, video telescopic rhinoplasty may be easily and inexpensively performed in any ENT department provided with this instrumentation...
December 2016: Acta Otorhinolaryngologica Italica
https://www.readbyqxmd.com/read/28177210/noise-reduction-method-for-quantifying-nanoparticle-light-scattering-in-low-magnification-dark-field-microscope-far-field-images
#19
Dali Sun, Jia Fan, Chang Liu, Yang Liu, Yang Bu, Christopher J Lyon, Ye Hu
Nanoparticles have become a powerful tool for cell imaging and biomolecule, cell and protein interaction studies, but are difficult to rapidly and accurately measure in most assays. Dark-field microscope (DFM) image analysis approaches used to quantify nanoparticles require high-magnification near-field (HN) images that are labor intensive due to a requirement for manual image selection and focal adjustments needed when identifying and capturing new regions of interest. Low-magnification far-field (LF) DFM imagery is technically simpler to perform but cannot be used as an alternate to HN-DFM quantification, since it is highly sensitive to surface artifacts and debris that can easily mask nanoparticle signal...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28169467/radiation-associated-angiosarcoma-in-the-setting-of-breast-cancer-mimicking-radiation-dermatitis-a-diagnostic-pitfall
#20
Brianne H Daniels, Jennifer S Ko, J Jordi Rowe, Erinn Downs-Kelly, Steven D Billings
BACKGROUND: We have encountered cases of postradiation angiosarcoma (PRAS) histologically mimicking radiation dermatitis. METHODS: Cases of PRAS from institutional/consultation archives from 2006-2016 were reviewed. For inclusion, tumors had to have inapparent/subtle tumor at low magnification and scattered individual tumor cells resembling radiation fibroblasts. Prior ancillary studies were reviewed, with additional immunostains performed as needed. RESULTS: Ten met criteria...
February 7, 2017: Journal of Cutaneous Pathology
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