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https://www.readbyqxmd.com/read/28928783/assessment-of-the-hardness-of-different-orthodontic-wires-and-brackets-produced-by-metal-injection-molding-and-conventional-methods
#1
Shiva Alavi, Marzie Kachuie
BACKGROUND: This study was conducted to assess the hardness of orthodontic brackets produced by metal injection molding (MIM) and conventional methods and different orthodontic wires (stainless steel, nickel-titanium [Ni-Ti], and beta-titanium alloys) for better clinical results. MATERIALS AND METHODS: A total of 15 specimens from each brand of orthodontic brackets and wires were examined. The brackets (Elite Opti-Mim which is produced by MIM process and Ultratrimm which is produced by conventional brazing method) and the wires (stainless steel, Ni-Ti, and beta-titanium) were embedded in epoxy resin, followed by grinding, polishing, and coating...
July 2017: Dental Research Journal
https://www.readbyqxmd.com/read/28922087/preexisting-cardiovascular-risk-and-subsequent-heart-failure-among-non-hodgkin-lymphoma-survivors
#2
Talya Salz, Emily C Zabor, Peter de Nully Brown, Susanne Oksberg Dalton, Nirupa J Raghunathan, Matthew J Matasar, Richard Steingart, Andrew J Vickers, Peter Svenssen Munksgaard, Kevin C Oeffinger, Christoffer Johansen
Purpose The use of anthracycline chemotherapy is associated with heart failure (HF) among survivors of non-Hodgkin lymphoma (NHL). We aimed to understand the contribution of preexisting cardiovascular risk factors to HF risk among NHL survivors. Methods Using Danish registries, we identified adults diagnosed with aggressive NHL from 2000 to 2010 and sex- and age-matched general-population controls. We assessed HF from 9 months after diagnosis through 2012. We used Cox regression analysis to assess differences in risk for HF between survivors and general population controls...
September 18, 2017: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28902250/effect-of-cpp-acp-paste-with-and-without-co2-laser-irradiation-on-demineralized-enamel-microhardness-and-bracket-shear-bond-strength
#3
Nasrin Farhadian, Loghman Rezaei-Soufi, Seyed Farzad Jamalian, Maryam Farhadian, Shahrzad Tamasoki, Milad Malekshoar, Bahareh Javanshir
Introduction: Many patients seeking orthodontic treatment already have incipient enamel lesions and should be placed under preventive treatments. The aim of this in vitro study was to evaluate the effect of CPP-ACP paste and CO2 laser irradiation on demineralized enamel microhardness and shear bond strength of orthodontic brackets. Methods: Eighty caries-free human premolars were subjected to a demineralization challenge using Streptococcus mutans. After demineralization, the samples were randomly divided into five equal experimental groups: Group 1 (control), the brackets were bonded without any surface treatment; Group 2, the enamel surfaces were treated with CPP-ACP paste for 4 minutes before bonding; Group 3, the teeth were irradiated with CO2 laser beams at a wavelength of 10...
July 2017: Dental Press Journal of Orthodontics
https://www.readbyqxmd.com/read/28895571/corrigendum-can-we-deliver-randomized-trials-of-focal-therapy-in-prostate-cancer
#4
Hashim U Ahmed, Viktor Berge, David Bottomley, William Cross, Rakesh Heer, Richard Kaplan, Tom Leslie, Chris Parker, Clare Relton, Richard Stephens, Matthew R Sydes, Lindsay Turnbull, Jan van der Meulen, Andrew Vickers, Timothy Wilt, Mark Emberton
No abstract text is available yet for this article.
September 12, 2017: Nature Reviews. Clinical Oncology
https://www.readbyqxmd.com/read/28888342/risk-of-venous-thromboembolism-following-influenza-vaccination-in-adults-aged-50years-and-older-in-the-vaccine-safety-datalink
#5
Elizabeth R Vickers, David L McClure, Allison L Naleway, Steven J Jacobsen, Nicola P Klein, Jason M Glanz, Eric S Weintraub, Edward A Belongia
BACKGROUND: Influenza-like illness and inflammation are known risk factors for venous thromboembolism (VTE), which includes deep vein thrombosis (DVT) and pulmonary embolism (PE). However, few studies have characterized the risk of VTE following influenza vaccination. We examined VTE risk after vaccination in adults 50years old and older within the Vaccine Safety Datalink (VSD). METHODS: We used the self-controlled case series method to determine the risk of VTE among age-eligible adults who received influenza vaccine (with or without pandemic H1N1) and experienced a VTE during the months of September through December in 2007 through 2012...
September 6, 2017: Vaccine
https://www.readbyqxmd.com/read/28877172/automated-recording-of-home-cage-activity-and-temperature-of-individual-rats-housed-in-social-groups-the-rodent-big-brother-project
#6
William S Redfern, Karen Tse, Claire Grant, Amy Keerie, David J Simpson, John C Pedersen, Victoria Rimmer, Lauren Leslie, Stephanie K Klein, Natasha A Karp, Rowland Sillito, Agis Chartsias, Tim Lukins, James Heward, Catherine Vickers, Kathryn Chapman, J Douglas Armstrong
Measuring the activity and temperature of rats is commonly required in biomedical research. Conventional approaches necessitate single housing, which affects their behavior and wellbeing. We have used a subcutaneous radiofrequency identification (RFID) transponder to measure ambulatory activity and temperature of individual rats when group-housed in conventional, rack-mounted home cages. The transponder location and temperature is detected by a matrix of antennae in a baseplate under the cage. An infrared high-definition camera acquires side-view video of the cage and also enables automated detection of vertical activity...
2017: PloS One
https://www.readbyqxmd.com/read/28874891/real-life-treatment-of-metastatic-colorectal-cancer-with-regorafenib-a-single-centre-review
#7
J Gotfrit, M Vickers, S Sud, T Asmis, C Cripps, R Goel, T Hsu, D Jonker, R Goodwin
BACKGROUND: Various tyrosine kinase signalling pathways affect the development and progression of colorectal cancer (crc). In clinical trials, regorafenib has been associated with a survival benefit in metastatic crc (mcrc). We assessed the safety and efficacy of regorafenib in real-world patients. METHODS: In a retrospective review of patients with mcrc treated with regorafenib at our institution from 2013 to 2015, patient demographics, treatment, and survival data were collected...
August 2017: Current Oncology
https://www.readbyqxmd.com/read/28874792/surveillance-for-highly-pathogenic-influenza-a-viruses-in-california-during-2014-2015-provides-insights-into-viral-evolutionary-pathways-and-the-spatiotemporal-extent-of-viruses-in-the-pacific-americas-flyway
#8
Andrew M Ramey, Nichola J Hill, Troy Cline, Magdalena Plancarte, Susan De La Cruz, Michael L Casazza, Joshua T Ackerman, Joseph P Fleskes, T Winston Vickers, Andrew B Reeves, Frances Gulland, Christine Fontaine, Diann J Prosser, Jonathan A Runstadler, Walter M Boyce
We used surveillance data collected in California before, concurrent with, and subsequent to an outbreak of highly pathogenic (HP) clade 2.3.4.4 influenza A viruses (IAVs) in 2014-2015 to (i) evaluate IAV prevalence in waterfowl, (ii) assess the evidence for spill-over infections in marine mammals and (iii) genetically characterize low-pathogenic (LP) and HP IAVs to refine inference on the spatiotemporal extent of HP genome constellations and to evaluate possible evolutionary pathways. We screened samples from 1496 waterfowl and 1142 marine mammals collected from April 2014 to August 2015 and detected IAV RNA in 159 samples collected from birds (n=157) and pinnipeds (n=2)...
September 6, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28869975/prostate-cancer-screening-time-to-question-how-to-optimize-the-ratio-of-benefits-and-harms
#9
Andrew J Vickers
No abstract text is available yet for this article.
September 5, 2017: Annals of Internal Medicine
https://www.readbyqxmd.com/read/28869218/novel-boron-channel-based-structure-of-boron-carbide-at-high-pressures
#10
Xinxin Zhang, Yu Zhao, Miao Zhang, Hanyu Liu, Yansun Yao, Taimin Cheng, Hui Chen
Boron carbide (B4C) is one of the hardest materials known to date. The extreme hardness of B4C arises from architecturally efficient B12 or B11C icosahedrons and strong inter-icosahedral B-C bonding. As an excellent material for use in ballistic armor, the mechanic limit of B4C and possible phase transitions under extreme stress conditions are of great interest. Here we systematically explored the post-icosahedral solid structures of B4C under high pressure, using an unbiased structure search method. A new structure composed of extended framework of B and zigzag chains of C is predicted to be stable above 96 GPa...
September 4, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28866245/incidence-and-effect-of-thromboembolic-events-in-radical-cystectomy-patients-undergoing-preoperative-chemotherapy-for-muscle-invasive-bladder-cancer
#11
Aditya Bagrodia, Ranjit Sukhu, Andrew G Winer, Eric Levy, Michael Vacchio, Byron Lee, Eugene J Pietzak, Timothy F Donahue, Eugene Cha, Gopa Iyer, Daniel D Sjoberg, Andrew J Vickers, Jonathan E Rosenberg, Dean F Bajorin, Guido Dalbagni, Bernard H Bochner
BACKGROUND: We evaluated the incidence and effect of thromboembolic events (TEEs) in patients with muscle-invasive bladder cancer treated with preoperative chemotherapy (POC) and radical cystectomy (RC) with pelvic lymph node dissection (PLND). PATIENTS AND METHODS: We performed a retrospective review of all patients who had undergone POC followed by RC plus PLND for muscle-invasive bladder cancer from June 2000 to January 2013 (n = 357). The chemotherapy type (neoadjuvant vs...
August 10, 2017: Clinical Genitourinary Cancer
https://www.readbyqxmd.com/read/28865652/-nothing-about-us-without-us
#12
Melissa Clark Vickers, Nora Wells
No abstract text is available yet for this article.
September 2017: Academic Pediatrics
https://www.readbyqxmd.com/read/28857262/microtomographic-parameters-and-nanoindentation-of-the-hoof-of-girolando-cattle
#13
B M Assis, L A F Silva, C R O Lima, F J F Sant'Ana, G P Santos, V A S Vulcani, R E Rabelo
The aim of this study was to describe the microstructure of the pigmented and depigmented hoof capsule of Girolando cattle by bi- and tridimensional microtomography and nanoindentation, analysing the possible relation between these findings and the susceptibility of such animals to podal diseases. To carry out the microtomography and the nanoindentation, duplicated samples were collected from the dorsal wall, abaxial wall and pre-bulbar sole of the hoof capsule. Material collection was performed in 40 medial digits of thoracic limbs and 40 lateral digits of pelvic limbs...
August 31, 2017: Anatomia, Histologia, Embryologia
https://www.readbyqxmd.com/read/28855756/remineralization-ability-of-sodium-fluoride-on-the-microhardness-of-enamel-dentin-and-dentinoenamel-junction-an-in-vitro-study
#14
Elangovan Sivapriya, Krishnamoorthy Sridevi, Ravishankar Periasamy, Lakshmikanthanbharathi Lakshminarayanan, Angambakkam Rajasekaran Pradeepkumar
AIM: Dental tissues such as enamel, dentinoenamel junction (DEJ), dentin, and root dentin can react differently to demineralization and remineralization. The aim of this study was to evaluate the remineralization ability of sodium fluoride on the microhardness of enamel, dentin, and dentinoenamel junction. MATERIALS AND METHODS: Ten extracted third molar teeth were sectioned mesiodistally to form control and test groups. For the test group, initial demineralization was done with acetic acid for 24 h followed by remineralization for 28 days by application of sodium fluoride (226 ppm) for 2 min twice a day...
March 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/28853230/risk-factors-for-multidrug-resistant-gram-negative-infection-in-burn-patients
#15
Mark L Vickers, Joel M Dulhunty, Emma Ballard, Paul Chapman, Michael Muller, Jason A Roberts, Menino O Cotta
BACKGROUND: Infection with multidrug-resistant (MDR) Gram-negative organisms leads to poorer outcomes in the critically ill burn patient. The aim of this study was to identify the risk factors for MDR Gram-negative pathogen infection in critically ill burn patients admitted to a major tertiary referral intensive care unit (ICU) in Australia. METHODS: A retrospective case-control study of all adult burn patients admitted over a 7-year period was conducted. Twenty-one cases that cultured an MDR Gram-negative organism were matched with 21 controls of similar age, gender, burn size and ICU stay...
August 29, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/28851580/improved-recovery-of-erectile-function-in-younger-men-after-radical-prostatectomy-does-it-justify-immediate-surgery-in-low-risk-patients
#16
Justin K Lee, Daniel D Sjoberg, Mariam Imnadze Miller, Andrew J Vickers, John P Mulhall, Behfar Ehdaie
BACKGROUND: Although active surveillance is increasingly used for the management of low-risk prostate cancer, many eligible patients are still nonetheless subject to curative treatment. One argument for considering surgery rather than active surveillance is that the probability of postoperative recovery of erectile function is age dependent, that is, patients who delay surgery may lose the window of opportunity to recover erectile function after surgery. OBJECTIVE: To model erectile function over a 10-yr period for immediate surgery versus active surveillance...
August 26, 2017: European Urology
https://www.readbyqxmd.com/read/28832713/comparing-depth-dependent-curing-radiant-exposure-and-time-of-curing-of-regular-and-flow-bulk-fill-composites
#17
Jose Augusto Rodrigues, Ilana Pais Tenorio, Ginger Baranhuk Rabello de Mello, André Figueiredo Reis, Chiayi Shen, Jean-François Roulet
The effect of restoration depth on the curing time of a conventional and two bulk-fill composite resins by measuring microhardness and the respective radiosity of the bottom surface of the specimen was investigated. 1-, 3- and 5-mm thick washers were filled with Surefil SDR Flow-U (SDR), Tetric EvoCeram Bulk Fill-IVA (TEC) or Esthet-X HD-B1 (EHD), and cured with Bluephase® G2 for 40s. Additional 1-mm washers were filled with SDR, TEC or EHD, placed above the light sensor of MARC®, stacked with pre-cured 1-, 3- or 5-mm washer of respective material, and cured for 2...
August 21, 2017: Brazilian Oral Research
https://www.readbyqxmd.com/read/28826636/objective-assessment-of-electrode-discrimination-with-the-auditory-change-complex-in-adult-cochlear-implant-users
#18
Rajeev Mathew, Jaime Undurraga, Guoping Li, Leah Meerton, Patrick Boyle, Azhar Shaida, David Selvadurai, Dan Jiang, Deborah Vickers
The spatial auditory change complex (ACC) is a cortical response elicited by a change in place of stimulation. There is growing evidence that it provides a useful objective measure of electrode discrimination in cochlear implant (CI) users. To date, the spatial ACC has only been measured in relatively experienced CI users with one type of device. Early assessment of electrode discrimination could allow auditory stimulation to be optimized during a potentially sensitive period of auditory rehabilitation. In this study we used a direct stimulation paradigm to measure the spatial ACC in both pre- and post-lingually deafened adults...
July 23, 2017: Hearing Research
https://www.readbyqxmd.com/read/28816183/impact-of-polishing-systems-on-the-surface-roughness-and-microhardness-of-nanocomposites
#19
Yasser Alfawaz
AIM: The aim of this article is to evaluate the influence of finishing and polishing techniques on the surface roughness and microhardness of two composite resins with two different types of polishing systems. MATERIALS AND METHODS: A total of 30 disk-shaped specimens of nanocomposite Filtek™ Z350 and Ceram-X® were prepared. They were divided into three groups. The control group (n = 10) received no finishing and polishing. The remaining specimens were divided into two groups, and they received polishing and finishing either with PoGo or Sof-Lex system...
August 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28815238/-effect-of-sintering-temperature-on-mechanical-properties-of-dental-zirconia-toughened-alumina-ceramics
#20
Jiang-Yuan Fan, Ting-Ting Lin, Fang-Xuan Hu, Rui-Bin Zheng, Fan Fan, Jian-Feng Ma
PURPOSE: To investigate the effect of sintering temperature on mechanical properties of dental zirconia toughened alumina (ZTA) ceramics prepared by gel-casting technique. METHODS: The samples prepared by gel-casting were sintered at 1100, 1200, 1250, 1300 and 1400degrees centigrade for each group. The flexural strength, fracture toughness, Vickers hardness and brittleness index were obtained and microscopic morphology of each group was observed under scanning electron microscope (SEM)...
April 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
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