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https://www.readbyqxmd.com/read/28738621/determining-heterocyclic-aromatic-amines-in-aqueous-samples-a-novel-dispersive-liquid-liquid-micro-extraction-method-based-on-solidification-of-floating-organic-drop-and-ultrasound-assisted-back-extraction-followed-by-uplc-ms-ms
#1
Romina Canales, María Guiñez, Cristian Bazán, Mario Reta, Soledad Cerutti
A novel dispersive liquid-liquid microextraction based on solidification of floating organic droplet combined with ultrasound assisted back extraction for the determination of four heterocyclic aromatic amines in natural water samples prior ultra high-performance liquid chromatography-tandem mass spectrometry was developed. The analytes were extracted from the water samples by a dispersive liquid-liquid microextraction procedure based on solidification of floating organic drop, which was performed by a mixture composed by a less dense than water extraction solvent, 1-undecanol, and a dispersive solvent, methanol...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738607/novel-colorimetric-assay-for-paraquat-detection-on-silica-bead-using-negatively-charged-silver-nanoparticles
#2
Weena Siangproh, Thachkorn Somboonsuk, Orawan Chailapakul, Kriangsak Songsrirote
A simple, rapid, sensitive, and economical method based on colorimetry for the determination of paraquat, a widely used herbicide, was developed. Citrate-coated silver nanoparticles (AgNPs) were synthesized as the colorimetric probe. The mechanism of the assay is related to the aggregation of negatively charged AgNPs as induced by positively-charged paraquat resulting from coulombic attraction which causes the color to change from a deep greenish yellow to pale yellow in accordance with the concentrations of paraquat...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28737011/a-distinctive-patchy-osteomalacia-characterises-phospho1-deficient-mice
#3
Alan Boyde, Katherine A Staines, Behzad Javaheri, Jose Luis Millan, Andrew A Pitsillides, Colin Farquharson
The phosphatase PHOSPHO1 is involved in the initiation of biomineralisation. Bones in Phospho1 knockout (KO) mice show histological osteomalacia with frequent bowing of long bones and spontaneous fractures: they contain less mineral, with smaller mineral crystals. However, the consequences of Phospho1 ablation on the microscale structure of bone are not yet fully elucidated. Tibias and femurs obtained from wild-type and Phospho1 null (KO) mice (25-32 weeks old) were embedded in PMMA, cut and polished to produce near longitudinal sections...
August 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28736921/supplementary-techniques-for-pain-control-during-root-canal-treatment-of-lower-posterior-teeth-with-irreversible-pulpitis-a-systematic-review-and-meta-analysis
#4
Pinpana Tupyota, Pattama Chailertvanitkul, Malinee Laopaiboon, Chetta Ngamjarus, Paul V Abbott, Suttichai Krisanaprakornkit
The purpose of this systematic review and meta-analysis was to evaluate utilisation of supplementary techniques for pain control during root canal treatment of lower molars with irreversible pulpitis. The literature was searched using electronic databases up to year 2012. Seventeen studies with 1504 participants were included and each study compared experimental interventions with a standard treatment, i.e. the inferior alveolar nerve block. Changing the injection techniques or supplemental injection had no significant effect on pulp anaesthesia compared to the standard treatment (P = 1...
July 24, 2017: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/28736602/radiographic-technical-quality-of-root-canal-treatment-performed-by-a-new-rotary-single-file-system
#5
Marco Colombo, Cristina Bassi, Riccardo Beltrami, Paolo Vigorelli, Antonio Spinelli, Andrea Cavada, Alberto Dagna, Marco Chiesa, Claudio Poggio
AIM: The aim of the present study was to evaluate radiographically the technical quality of root canal filling performed by postgraduate students with a new single-file Nickel-Titanium System (F6 Skytaper Komet) in clinical practice. METHODS: Records of 74 patients who had received endodontic treatment by postgraduate students at the School of Dentistry, Faculty of Medicine, University of Pavia in the period between September 2015 and April 2016 were collected and examined: the final sample consisted 114 teeth and 204 root canals...
January 2017: Annali di Stomatologia
https://www.readbyqxmd.com/read/28736427/ultrasonographic-features-of-the-normal-filum-terminale
#6
Myoungae Kwon, Bo-Kyung Je, Doran Hong, Byung Min Choi
Purpose: The filum terminale (FT) is a fibrous band that connects the conus medullaris to the posterior body of the coccyx. Considering the advances of ultrasonography (US) technology and improvements in the resolution of US images, we aimed to re-establish the US features of the normal FT in infants younger than 6 months of age. Methods: We retrospectively reviewed 30 spinal US scans, stored as video clips. The internal structure of the FT and the marginal echogenicity of the FT were assessed, and transverse and longitudinal US were compared...
June 8, 2017: Ultrasonography
https://www.readbyqxmd.com/read/28736124/implications-of-three-dimensional-modeling-of-the-proximal-femur-for-cephalomedullary-nailing-an-asian-cadaver-study
#7
Chang-Soo Chon, Bokku Kang, Han Sung Kim, Gu-Hee Jung
PURPOSE: To determine the variability in the ideal entry point of cephalomedullary (CM) nail around the greater trochanter (GT) and the consequent conformity with the proximal femur by analyzing three-dimensional (3D) modeling and virtual implantation MATERIALS AND METHODS: A total of 105 cadaveric femurs (50 males and 55 females) underwent continuous 1.0mm slice computed tomography (CT) scans. CT images imported into Mimics(®) software to reconstruct the 3D model of the proximal femur and medullary canal...
July 11, 2017: Injury
https://www.readbyqxmd.com/read/28736098/posterior-canal-wall-reposition-for-management-of-cholesteatoma-technique-and-results
#8
Mohammad Kamal Mobashir, Waleed M Basha, Abd ElRaof Said Mohamed, Mohammed Elsayed Elmaghawry
OBJECTIVE: The main goal of surgery in acquired middle ear cholesteatomas is the complete eradication of the disease with an ear free of discharge. This can be performed either by open or closed techniques with their benefits and drawbacks. We present the technique of reposition of the posterior canal wall for the management of cholesteatoma cases and its results and outcome. PATIENTS AND METHODS: This study included 31 patients with primary acquired middle ear cholesteatoma...
July 20, 2017: Auris, Nasus, Larynx
https://www.readbyqxmd.com/read/28735964/bovine-a20-gene-overexpression-during-bovine-viral-diarrhea-virus-1-infection-blocks-nf-%C3%AE%C2%BAb-pathway-in-mdbk-cells
#9
Melina Villalba, Nivia Canales, Nicolas Maldonado, Carola Otth, Fernanda Fredericksen, Pablo Garcés, Cristopher Stepke, Valentina Arriagada, Víctor H Olavarría
Viruses have developed cellular strategies to ensure progeny survival. One of the most interesting is immune camouflage, where the virus triggers a controlled-intensity immune response that prevents total destruction of the infected cell, thus "winning time" for the virus. This study explored the regulatory contexts of the bovine A20 gene during bovine viral diarrhea virus (BVDV)-1 infection, using IL-8 as an immune-response sentinel molecule. Assessments were conducted through RT-qPCR, Western blotting, gene silencing/overexpression, luciferase assays, and the use of pharmacological inhibitors, among other approaches...
July 20, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28735796/prevalence-of-second-mesiobuccal-canals-in-maxillary-first-molars-detected-using-cone-beam-computed-tomography-direct-occlusal-access-and-coronal-plane-grinding
#10
Brent M Hiebert, Kenneth Abramovitch, Dwight Rice, Mahmoud Torabinejad
INTRODUCTION: The purpose of this study was to determine the prevalence of the second mesiobuccal canal (MB2) in 100 maxillary first molars using 3 independent methods and a combination method. METHODS: One hundred extracted human maxillary first molars were collected. The teeth were mounted in the maxillary first molar extraction sockets of a human cadaver head. A cone-beam computed tomographic (CBCT) scan was taken of each tooth. Two radiology faculty independently evaluated the CBCT volume for the presence of an MB2 canal...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735795/accuracy-of-2-endodontic-rotary-motors-with-integrated-apex-locator
#11
Alessandra Timponi Goes Cruz, Caroline Wichnieski, Everdan Carneiro, Ulisses Xavier da Silva Neto, Gianluca Gambarini, Lucila Piasecki
INTRODUCTION: The purpose of this study was to evaluate in vitro the efficacy of both the electronic apex locator (EAL) and auto apical reverse (AAR) functions of the endodontic motor MM Control (Micro-Mega, Besançon Cedex, France) compared with Root ZX II (J Morita, Tokyo, Japan). METHODS: After cervical preflaring, the actual lengths (ALs) of 36 single-rooted teeth were obtained up to the apical foramen. The EAL measurements at the marks "APEX" and "0.5" of both devices were obtained using an alginate model...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735794/influence-of-different-kinematics-on-apical-extrusion-of-irrigant-and-debris-during-canal-preparation-using-k3xf-instruments
#12
Mustafa Toyoğlu, Demet Altunbaş
INTRODUCTION: This in vitro study was designed to evaluate the amount of apically extruded irrigant and debris during root canal preparation using K3XF instruments (SybronEndo, Orange, CA) with different kinematics and using hand files with a step-back technique. METHODS: A total of 80 extracted mandibular premolars were selected and randomly assigned to 4 groups (n = 20). The root canals were instrumented with K-type stainless steel instruments using a step-back technique and with the K3XF system using the following kinematics: reciprocating motion, adaptive motion, and continuous rotation...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735793/dentinal-microcrack-development-after-canal-preparation-a-longitudinal-in-situ-micro-computed-tomography-study-using-a-cadaver-model
#13
Gustavo De-Deus, Júlio César de Azevedo Carvalhal, Felipe Gonçalves Belladonna, Emmanuel João Nogueira Leal Silva, Ricardo Tadeu Lopes, Renato Evando Moreira Filho, Erick Miranda Souza, José Claudio Provenzano, Marco Aurélio Versiani
INTRODUCTION: The purpose of this study was to evaluate the development of dentinal microcracks after root canal preparation with Reciproc and ProTaper Universal systems using an in situ cadaver model by means of a micro-computed tomography (micro-CT) imaging system. METHODS: At autopsy, 8 maxillary bone blocks having at least the first and second premolar teeth (n = 16) were excised, scanned at a resolution of 13.18 μm, and randomly distributed into 2 groups (n = 8) according to the preparation protocol: Reciproc and ProTaper Universal systems...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735792/dynamic-torque-and-vertical-force-analysis-during-nickel-titanium-rotary-root-canal-preparation-with-different-modes-of-reciprocal-rotation
#14
Daisuke Tokita, Arata Ebihara, Miki Nishijo, Kana Miyara, Takashi Okiji
INTRODUCTION: The purpose of the present study was to compare 2 modes of reciprocal movement (torque-sensitive and time-dependent reciprocal rotation) with continuous rotation in terms of torque and apical force generation during nickel-titanium rotary root canal instrumentation. METHODS: A custom-made automated root canal instrumentation and torque/force analyzing device was used to prepare simulated canals in resin blocks and monitor the torque and apical force generated in the blocks during preparation...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735789/xp-shaper-a-novel-adaptive-core-rotary-instrument-micro-computed-tomographic-analysis-of-its-shaping-abilities
#15
Adham A Azim, Lucila Piasecki, Ulisses Xavier da Silva Neto, Alessandra Timponi Goes Cruz, Katharina A Azim
INTRODUCTION: The aim of this study was to investigate the shaping abilities of the XP Shaper (FKG, La Chaux-de-Fonds, Switzerland) and compare the findings with Vortex Blue (Dentsply Tulsa Dental Specialties, Tulsa, OK) using micro-computed tomographic imaging. METHODS: Twenty matched, extracted, mandibular, central incisors with a single, oval canal were scanned preoperatively at 25-μm resolution and postoperatively after instrumentation with either Vortex Blue in a crown-down manner up to size 30...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735788/effect-of-mineral-trioxide-aggregate-apical-plug-thickness-on-fracture-resistance-of-immature-teeth
#16
Ersan Çiçek, Neslihan Yılmaz, M Murat Koçak, Baran Can Sağlam, Sibel Koçak, Burcu Bilgin
INTRODUCTION: The aim of this study was to compare the fracture resistance of simulated immature teeth after using different thicknesses of mineral trioxide aggregate (MTA) apical plugs. METHODS: Fifty-two human maxillary anterior teeth were used. Five teeth were the positive control group; they were prepared using Peeso reamers to simulate immature teeth without any access cavity preparation. Access cavities of the 47 teeth were prepared, and the canals were instrumented with Peeso reamers...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735786/cone-beam-computed-tomographic-study-of-root-anatomy-and-canal-configuration-of-molars-in-a-spanish-population
#17
Mercedes Pérez-Heredia, Carmen María Ferrer-Luque, Manuel Bravo, Pablo Castelo-Baz, Manuel Ruíz-Piñón, Pilar Baca
INTRODUCTION: The aim of this study was to identify morphologic peculiarities of roots and analyze the root canal configuration in maxillary and mandibular first and second molars by means using cone-beam computed tomographic (CBCT) imaging in a Spanish population. METHODS: A total of 284 maxillary molars and 242 mandibular molars from 112 patients were examined in vivo by CBCT imaging; only untreated molars with healthy and fully matured apices were included in this study...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28735785/effect-of-the-simultaneous-working-length-control-during-root-canal-preparation-on-postoperative-pain
#18
Hakan Arslan, Yahya Güven, Ertuğrul Karataş, Ezgi Doğanay
AIM: The aim of this study was to evaluate the effect of simultaneous length control during root canal preparation on postoperative pain compared with separate working length determination and root canal preparation. The design was a parallel-group, randomized, controlled trial with 2 arms. METHODS: Forty-four molar teeth were randomly divided into 2 groups (n = 22), a control group (separate length determination and root canal preparation) and a simultaneous length control during root canal preparation group...
July 20, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28734652/worldwide-prevalence-of-mandibular-second%C3%A2-molar%C3%A2-c-shaped-morphologies-evaluated-by-cone-beam-computed-tomography
#19
Murilo von Zuben, Jorge N R Martins, Luiza Berti, Imran Cassim, Daniel Flynn, Jose Antonio Gonzalez, Yongchun Gu, Jojo Kottoor, Adam Monroe, Rubén Rosas Aguilar, Miguel Seruca Marques, António Ginjeira
INTRODUCTION: The aim of this study was to evaluate and compare the C-shaped mandibular second molar prevalence in different regions around the world with the aid of cone-beam computed tomography technology. METHODS: Nine field observers from 9 different geographic regions were calibrated. A total of 400 samples were collected in each region. The prevalence of C-shaped anatomy was calculated. The number of roots and the configuration of the C-shaped canals at 3 different axial levels were also evaluated...
July 19, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28734647/rare-root-canal-configuration-of-mandibular-second-premolar-using-cone-beam-computed-tomographic-scanning
#20
Jamie Ring, Karla C Ring
The aim of this case report was to demonstrate how the use of cone-beam computed tomographic (CBCT) imagery is beneficial when treating a tooth with an unusual anatomic variation. A 43-year-old female patient presented to our private practice after a referral from her general dentist. Endodontic therapy was previously initiated and unable to be completed because of suspicious anatomic anatomy. CBCT imagery confirmed the presence of a C-shaped root configuration and 3 canals within the tooth. Root canal treatment was completed successfully without complications...
July 19, 2017: Journal of Endodontics
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