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N G Fischer, A Tsujimoto, A G Baruth
OBJECTIVE: Limited information is available on how to polish and finish zirconia surfaces following computer-aided design/computer-aided manufacturing (CAD/CAM), specifically, how differing application forces and reuse of zirconia polishing systems affect zirconia topography. PURPOSE: To determine the effect of differing, clinically relevant, polishing application forces and multiple usages of polishing burs on the surface topography of CAD/CAM zirconia. METHODS: One hundred twenty 220-grit carbide finished zirconia disks were sintered according to manufacturer's directions and divided into two groups for the study of two coarse polishing bur types...
March 16, 2018: Operative Dentistry
Toru Takagi, Akira Aoki, Shizuko Ichinose, Yoichi Taniguchi, Noriko Tachikawa, Takeshi Shinoki, Walter Meinzer, Anton Sculean, Yuichi Izumi
BACKGROUND: Recently, the occurrence of peri-implantitis has been increasing. However, a suitable method to debride the contaminated surface of titanium implants has not been established. The aim of this study was to investigate the morphological changes of the microstructured fixture surface after erbium laser irradiation, and to clarify the effects of the erbium lasers when used to remove calcified deposits from implant fixture surfaces. METHODS: In experiment 1, sandblasted, large grit, acid etched surface implants were treated with Er:YAG laser or Er,Cr:YSGG laser at 30-60 mJ/pulse and 20 Hz with water spray...
March 13, 2018: Journal of Periodontology
Frank A Giordano, Stefanie Brehmer, Bettina Mürle, Grit Welzel, Elena Sperk, Anke Keller, Yasser Abo-Madyan, Elisabeth Scherzinger, Sven Clausen, Frank Schneider, Carsten Herskind, Martin Glas, Marcel Seiz-Rosenhagen, Christoph Groden, Daniel Hänggi, Peter Schmiedek, Bahman Emami, Luis Souhami, Kevin Petrecca, Frederik Wenz
BACKGROUND: The median time to recurrence of glioblastoma (GB) following multimodal treatment is ∼7 mo. Nearly all cancers recur locally, suggesting that augmenting local treatments may improve outcomes. OBJECTIVE: To investigate whether intraoperative radiotherapy (IORT) to the resection cavity is safe and effective. METHODS: INTRAGO was a phase I/II trial to evaluate the safety and tolerability of IORT with 20 to 40 Gy of low-energy photons in addition to standard radiochemotherapy (ClinicalTrials...
March 8, 2018: Neurosurgery
Wei Duan-Porter, Daniel Hatch, Jane F Pendergast, Gabriele Freude, Uwe Rose, Hermann Burr, Grit Müller, Peter Martus, Anne Pohrt, Guy Potter
BACKGROUND: Job related factors have been associated with higher risk for developing depression, but past studies lacked full consideration of individual factors such as personality and coping. We sought to evaluate associations of personality, coping, job characteristics, and burnout with 12-month trajectories of depressive symptoms among nursing workers. METHODS: Cohort of nursing workers (N = 281) in a private hospital system, with baseline assessments of personality, job characteristics, and coping...
February 27, 2018: Journal of Affective Disorders
Saman Ebadi, Hiwa Weisi, Zahra Khaksar
Grit as an interesting and significant topic in psychology has been associated with better study habits and higher grades through perseverance and passion for long term goals. The only available measurement instrument of grit (Duckworth et al. in J Personal Soc Psychol 92:1087-1101, 2007) is general both in terms of its subject matter and context. Thus, this study aims to develop and validate an English as a foreign language (EFL) grit instrument whose items are specific to EFL context to obtain a more detailed view of its components for Iranian EFL learners, and to tap on other grit related factors in the EFL context...
March 6, 2018: Journal of Psycholinguistic Research
Demetrios Moris, Georgia-Sofia Karachaliou, Timothy M Pawlik, Benedict Nwomeh
General surgery is one of the more popular career choices among medical students worldwide. An alarming one in five general surgery residents, however, abandon residency training-a rate that is much higher than most other medical and surgical specialities. We believe that additional measures are needed to decrease attrition and increase "grit" among house staff. Specifically, the diversification of the surgery training experience to include global and rural surgery may help mitigate burnout among surgical house staff...
April 2018: Journal of Surgical Research
Kyung-Soon Park, Abdel Ghani Ibrahim Al Awamleh, Sung-Am Cho
PURPOSE: The purpose of this study was to analyze the effects of two different implant surface treatments on initial bone connection by comparing the Removal Torque Values (RTQs) at 7 and 10 days after chemically modified, sandblasted, large-grit and acid-etched (modSLA), and Laser-etched (LE) Ti implant placements. MATERIALS AND METHODS: Twenty modSLA and 20 LE implants were installed on the left and right tibias of 20 adult rabbits. RTQs were measured after 7 and 10 days in 10 rabbits each...
February 2018: Journal of Advanced Prosthodontics
Neslihan Tekçe, Sinan Fidan, Safa Tuncer, Dilan Kara, Mustafa Demirci
PURPOSE: To investigate the effect of accelerated aging on surface properties of glazed CAD/CAM resin blocks using a 2D surface profilometer and a 3D non-contact optical profilometer. MATERIALS AND METHODS: Three types of CAD/CAM resin restorative materials, LAVA Ultimate (3M ESPE, St Paul, MN, USA), VITA Enamic (Vita Zahnfabrik H. Rauter, Bad Säckingen, Germany), and Cerasmart (GC Corparation, Tokyo, Japan) were used for this study. CAD/CAM blocks were cut in 3-mm thickness slabs and divided into three groups; Group 1: control group (specimens polished with 600 grit SCI paper); Group 2: specimens sandblasted, silanized, and glazed with Optiglaze Color (GC); Group 3: glazed specimens subjected to 5000 thermocycles (n=15)...
February 2018: Journal of Advanced Prosthodontics
Mima Uegomori, Yuko Haraguchi, Takeshi Obi, Kozo Takase
We analyzed the gizzards, and grits retained in the gizzards of 41 cranes that migrated to the Izumi Plain during the winter of 2015/2016 and died there, either due to accident or disease. These included 31 Hooded Cranes (Grus monacha) and 10 White-naped Cranes (G. vipio). We determined body weight, gizzard weight, total grit weight and number per gizzard, and size, shape, and surface roundness of the grits. Average gizzard weights were 92.4 g for Hooded Cranes and 97.1 g for White-naped Cranes, and gizzard weight positively correlated with body weight in both species...
March 5, 2018: Journal of Veterinary Medical Science
Matthew L Wong, Jared Anderson, Thomas Knorr, Joshua W Joseph, Leon D Sanchez
INTRODUCTION: The personality traits of emergency physicians are infrequently studied, though interest in physician wellness is increasing. The objective of this study is to acquire pilot data about the amount of grit, anxiety, and stress in emergency physicians using established psychological survey instruments, and to examine their associations of each of these traits with each other. METHODS: Thirty-six emergency medicine resident and attending physicians from an urban academic medical center consented for enrollment...
February 26, 2018: American Journal of Emergency Medicine
Ji-Yeon Lee, Jaechan Ahn, Sang In An, Jeong-Won Park
Objectives: The aim of this study is to compare the shear bond strengths of ceramic brackets bonded to zirconia surfaces using different zirconia primers and universal adhesive. Materials and Methods: Fifty zirconia blocks (15 × 15 × 10 mm, Zpex, Tosoh Corporation) were polished with 1,000 grit sand paper and air-abraded with 50 µm Al2 O3 for 10 seconds (40 psi). They were divided into 5 groups: control (CO), Metal/Zirconia primer (MZ, Ivoclar Vivadent), Z-PRIME Plus (ZP, Bisco), Zirconia Liner (ZL, Sun Medical), and Scotchbond Universal adhesive (SU, 3M ESPE)...
February 2018: Restorative Dentistry & Endodontics
A Boyde
Laser ablation machining or microtomy (LAM) is a relatively new approach to producing slide mounted sections of translucent materials. We evaluated the method with a variety of problems from the bone, joint and dental tissues fields where we require thin undecalcified and undistorted sections for correlative light microscopy (LM) and backscattered electron scanning electron microscopy (BSE SEM). All samples were embedded in poly-methylmethacrlate (PMMA) and flat block surfaces had been previously studied by BSE-SEM and confocal scanning light microscopy (CSLM)...
February 27, 2018: Journal of Microscopy
J Y Liu, F Chen, Y J Ge, L Wei, S X Pan, H L Feng
OBJECTIVE: To evaluate the influence of the rough surface of dental implants prepared by selective laser melting (SLM) on early bone healing around titanium implants. METHODS: A total of sixteen titanium implants were involved in our research, of which eight implants were prepared by SLM (TIXOS Cylindrical, Leader-Novaxa, Milan, Italy; 3.3 mm×10 mm, internal hex) and the other eight were sandblasted, large-grit and acid-etched (SLA) implants (IMPLUS Cylindrical, Leader-Novaxa, Milan, Italy; 3...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
K X Xie, Y G Li, P Zhang, X Wang
OBJECTIVE: To evaluate the effect of acid etching of retropreps on seal of different retrofill materials. METHODS: In the study, 80 freshly extracted lower molar teeth were used. They were examined under 3.5× magnifying glass to rull out fractures. They were cleaned and stored in distilled water before use. The distal roots were sectioned off and underwent root canal treatment. Rotary nickel-titanium instruments were used during instrumentation and the roots were obturated using lateral condensation technique...
February 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
Donata Bessey
This research note analyzes the relationship between experimentally elicited, incentivized economic preference parameters, personality traits, and three health behaviors: smoking, drinking, and physical activity. While there is a strand of economic research that uses proxy measures of risk and time preference that are not derived from an incentivized experiment and personality traits at the same time, and a considerably smaller one that uses experimentally elicited measures of risk and time preference only, the innovation of my work is to use experimentally elicited, incentivized preference measures and personality traits at the same time to explain a range of health behaviors...
February 23, 2018: International Journal of Health Economics and Management
Roberta Galli, Grit Preusse, Christian Schnabel, Thomas Bartels, Kerstin Cramer, Maria-Elisabeth Krautwald-Junghanns, Edmund Koch, Gerald Steiner
In order to provide an alternative to day-old chick culling in the layer hatcheries, a noninvasive method for egg sexing is required at an early stage of incubation before onset of embryo sensitivity. Fluorescence and Raman spectroscopy of blood offers the potential for precise and contactless in ovo sex determination of the domestic chicken (Gallus gallus f. dom.) eggs already during the fourth incubation day. However, such kind of optical spectroscopy requires a window in the egg shell, is thus invasive to the embryo and leads to decreased hatching rates...
2018: PloS One
Jose L Arco-Tirado, Francisco D Fernández-Martín, Rick H Hoyle
This paper describes the development and initial validation of a Spanish version of the Short Grit (Grit-S) Scale. The Grit-S Scale was adapted and translated into Spanish using the Translation, Review, Adjudication, Pre-testing, and Documentation model and responses to a preliminary set of items from a large sample of university students ( N = 1,129). The resultant measure was validated using data from a large stratified random sample of young adults ( N = 1,826). Initial validation involved evaluating the internal consistency of the adapted scale and its subscales and comparing the factor structure of the adapted version to that of the original scale...
2018: Frontiers in Psychology
Valentin Kusch, Grit Bornschein, Desiree Loreth, Julia Bank, Johannes Jordan, David Baur, Masahiko Watanabe, Akos Kulik, Manfred Heckmann, Jens Eilers, Hartmut Schmidt
Spatial relationships between Cav channels and release sensors at active zones (AZs) are a major determinant of synaptic fidelity. They are regulated developmentally, but the underlying molecular mechanisms are largely unclear. Here, we show that Munc13-3 regulates the density of Cav 2.1 and Cav 2.2 channels, alters the localization of Cav 2.1, and is required for the development of tight, nanodomain coupling at parallel-fiber AZs. We combined EGTA application and Ca2+ -channel pharmacology in electrophysiological and two-photon Ca2+ imaging experiments with quantitative freeze-fracture immunoelectron microscopy and mathematical modeling...
February 20, 2018: Cell Reports
Grit Winterfeld, Hannes Becher, Stephanie Voshell, Khidir Hilu, Martin Röser
Karyotype characteristics can provide valuable information on genome evolution and speciation, in particular in taxa with varying basic chromosome numbers and ploidy levels. Due to its worldwide distribution, remarkable variability in morphological traits and the fact that ploidy change plays a key role in its evolution, the canary grass genus Phalaris (Poaceae) is an excellent study system to investigate the role of chromosomal changes in species diversification and expansion. Phalaris comprises diploid species with two basic chromosome numbers of x = 6 and 7 as well as polyploids based on x = 7...
2018: PloS One
Raeanne C Moore, Mariam A Hussain, Caitlin W-M Watson, Pariya L Fazeli, María J Marquine, Brandon C Yarns, Dilip V Jeste, David J Moore
Grit and ambition are psychological factors that may protect neurocognitive function among persons living with HIV (PLWH). We examined associations between grit, ambition, premorbid verbal intellectual function, and current neurocognitive and everyday functioning among PLWH and persons without HIV (HIV-). 120 PLWH and 94 HIV- adults completed the Grit Scale (includes total score and consistency of interests and perseverance of effort subscales), ambition scale, and a comprehensive neurobehavioral battery. PLWH had lower grit scores than HIV- adults...
February 17, 2018: AIDS and Behavior
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