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https://www.readbyqxmd.com/read/28642910/influence-of-abutment-design-on-retention-of-metal-copings-cemented-to-implants
#1
Albano Porto da Cunha, Glauco Pereira Moysés, Ana Christina Claro Neves, Rafael Pino Vitti, Flávia Cardoso da Rosa Goulart, Laís Regiane da Siva-Concílio
Objective The study evaluated the influence of abutment design on the retention of implant-cemented metal copings. Material and methods Two abutments of the same system with the same indications, height and the total occlusal convergence, but of different designs were evaluated. Ten RN synOcta abutments (Straumann, Waltham, MA) and ten RN titanium solid abutments (Straumann, Waltham, MA) were tightened to 35 Ncm on 20 implant analogs previously placed in resin blocks. Twenty plastic burnout copings were waxed, included, cast and machined by a single operator...
December 2016: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/28629615/a-simple-method-to-compare-firing-pin-marks-using-stereomicroscope-and-microsoft-office-windows-8-tools
#2
R Suresh
Pertinent marks of fired cartridge cases such as firing pin, breech face, extractor, ejector, etc. are used for firearm identification. A non-standard semiautomatic pistol and four .22rim fire cartridges (head stamp KF) is used for known source comparison study. Two test fired cartridge cases are examined under stereomicroscope. The characteristic marks are captured by digital camera and comparative analysis of striation marks is done by using different tools available in the Microsoft word (Windows 8) of a computer system...
June 7, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28628137/-antagonistic-effect-of-quercetin-on-pm2-5-toxicity-in-the-rat-s-embryonic-development-in-vitro
#3
A Q Fan, J Q Feng, W Liu, M J Zhang, T Liu, Y L Zhou, Y J Xu
OBJECTIVE: To explore the antagonistic effect of quercetin on fine particulate matter (PM2.5)-induced embryonic developmental toxicity in vitro. METHODS: PM2.5 was collected on glass fiber filters by PM2.5 samplers during the heating period of Dec. 2015 to Mar. 2016 in an area of Haidian District, Beijing City. The sampled filters were cut into 1 cm×3 cm pieces followed by sonication. The PM2.5 suspension was filtered into a 10 cm glass dish through 8 layers of sterile carbasus and stored at -80 °C until freeze drying...
June 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28621270/influence-of-hand-instrumentation-and-ultrasonic-scaling-on-the-microleakage-of-various-cervical-restorations-an-in-vitro-study
#4
Bita Rohani, Mehrdad Barekatain, Shirin Z Farhad, Navid Haghayegh
INTRODUCTION: In cervical lesions, various restorative materials can be inserted, which can be affected by the application of periodontal scalers. This study evaluated and compared the marginal seal of class V glass ionomer, composite resin, and amalgam restorations after subjecting them to hand instrumentation and ultrasonic scaling. MATERIALS AND METHODS: In this experimental study, 30 sound human first premolars were selected. In each tooth, buccal and lingual cavities (4 mm mesiodistal width, 3 mm occlusogingival height, and 2 mm depth) were made...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28617865/a-human-genotyping-trial-to-estimate-the-post-feeding-time-from-mosquito-blood-meals
#5
Yuuji Hiroshige, Masaaki Hara, Atsushi Nagai, Tomoyuki Hikitsuchi, Mitsuo Umeda, Yumi Kawajiri, Koji Nakayama, Koichi Suzuki, Aya Takada, Akira Ishii, Toshimichi Yamamoto
Mosquitoes occur almost worldwide, and females of some species feed on blood from humans and other animals to support ovum maturation. In warm and hot seasons, such as the summer in Japan, fed mosquitoes are often observed at crime scenes. The current study attempted to estimate the time that elapsed since feeding from the degree of human DNA digestion in mosquito blood meals and also to identify the individual human sources of the DNA using genotyping in two species of mosquito: Culex pipiens pallens and Aedes albopictus...
2017: PloS One
https://www.readbyqxmd.com/read/28616826/deposition-of-crystalline-hydroxyapatite-nano-particle-on-zirconia-ceramic-a-potential-solution-for-the-poor-bonding-characteristic-of-zirconia-ceramics-to-resin-cement
#6
Abbas Azari, Sakineh Nikzad, Arash Yazdani, Faezeh Atri, Abbas Fazel Anvari-Yazdi
The poor bonding strength of zirconia to different dental substrates is one of the challenging issues in restorative dentistry. Hydroxyapatite is an excellent biocompatible material with fine bonding properties. In this study, it was hypothesized that hydroxyapatite coating on zirconia would improve its bond strength. Forty-five zirconia blocks were prepared and randomly divided into three groups: hydroxyapatite coating, sandblasting, and no preparation (control). The blocks were bonded to cement and the micro-shear bond strength was measured following load application...
July 2017: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/28609967/discovery-of-i-penicillidmus-i-in-the-bismarck-archipelago-papua-new-guinea-with-description-of-a-new-species-from-lavongai-new-hanover-island-coleoptera-staphylinidae-scydmaeninae
#7
Paweł Jałoszyński
Penicillidmus Jałoszyński, 2014 was established to accommodate two Australian species of Glandulariini. Penicillidmus masseyensis Jałoszyński, 2014 and P. unicolor Jałoszyński, 2014 are known to occur in Cape York, northern Queensland. With the adult body length ranging from 0.83 to 0.86 mm, these species are among the smallest Australian scydmaenines. Another, yet undescribed species represented by a female, is also known to occur within the same area (Jałoszyński 2014). Penicillidmus resembles similarly small adults of Microscydmus Saulcy & Croissandeau, 1893, but can be easily distinguished on the basis of remarkable cephalic and prothoracic structures...
April 18, 2017: Zootaxa
https://www.readbyqxmd.com/read/28606409/microstructural-analysis-and-reliability-of-monolithic-zirconia-after-simulated-adjustment-protocols
#8
Eliseo Pablo Chun, Lilian Costa Anami, Estevam Augusto Bonfante, Marco Antonio Bottino
OBJECTIVE: To investigate the microstructural properties and reliability of zirconia partially stabilized by yttrium oxide (Y-TZP) for use in monolithic form (Vita YZ HT, Vita Zahnfabrik, Germany) after different clinical adjustment protocols simulation. One-hundred and sixty two Y-TZP discs of high translucency were divided into 6 groups (n=27), according to simulated adjustments: S-Y-TZP as sintered; G-glazed Y-TZP; DbG-Y-TZP with diamond bur adjustment simulation followed by glaze application; GDb-glazed Y-TZP adjusted with diamond bur; DbDrG-Y-TZP with adjustment simulation with diamond bur and polishing kit (diamond rubber), followed by glaze; GDbDr-glazed Y-TZP with adjustment simulation with diamond bur followed by polishing kit...
June 9, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28598580/neuroanatomy-of-the-pig-cardiac-ventricles-a-stereomicroscopic-confocal-and-electron-microscope-study
#9
Neringa Pauziene, Kristina Rysevaite-Kyguoliene, Paulius Alaburda, Audrys G Pauza, Monika Skukauskaite, Aiste Masaityte, Goda Laucaityte, Inga Saburkina, Hermanas Inokaitis, Jurgita Plisiene, Dainius H Pauza
Although the pig is a model for heart disease, the neuroanatomy of cardiac ventricles (CV) in this species remains undetailed. We aimed to define the innervation pattern of pig CV, combining histochemistry for acetylcholinesterase, immunofluorescent labeling and electron microscopy. Forty nine examined pig hearts show that the major nerves supplying the ventral side of CV descend from the venous part of the heart hilum. Fewer in number and smaller in size, epicardial nerves supply the dorsal half of the CV...
June 9, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/28598179/in-vivo-and-in-vitro-comparison-of-icdas-ii-diagnodent-pen-cariescan-pro-and-soprolife-camera-for-occlusal-caries-detection-in-primary-molar-teeth
#10
A Kockanat, M Unal
AIM: This research was aimed to investigate the in vivo and in vitro performance of traditional and novel methods in the detection of occlusal caries in primary teeth. MATERIALS AND METHODS: One hundred twenty primary molar teeth were assessed by two examiners both in vivo using ICDAS II, radiographic examination, DIAGNOdent pen, CarieScan PRO and SoproLife camera and in vitro using the mentioned diagnostic methods except radiographic examination. In addition, in vitro examinations were repeated 2 weeks later...
June 2017: European Journal of Paediatric Dentistry: Official Journal of European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/28578926/the-use-of-porcine-corrosion-casts-for-teaching-human-anatomy
#11
Lada Eberlova, Vaclav Liska, Hynek Mirka, Zbynek Tonar, Stanislav Haviar, Milos Svoboda, Jan Benes, Richard Palek, Michal Eminger, Jachym Rosendorf, Patrik Mik, Sarah Leupen, Alois Lametschwandtner
In teaching and learning human anatomy, anatomical autopsy and prosected specimens have always been indispensable. However, alternative methods must often be used to demonstrate particularly delicate structures. Corrosion casting of porcine organs with Biodur E20(®) Plus is valuable for teaching and learning both gross anatomy and, uniquely, the micromorphology of cardiovascular, respiratory, digestive, and urogenital systems. Assessments of casts with a stereomicroscope and/or scanning electron microscope as well as highlighting cast structures using color coding help students to better understand how the structures that they have observed as two-dimensional images actually exist in three dimensions, and students found using the casts to be highly effective in their learning...
June 1, 2017: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
https://www.readbyqxmd.com/read/28577367/occurence-of-dentinal-defects-after-root-canal-preparation-with-r-phase-m-wire-and-gold-wire-instruments-a-micro-ct-analysis
#12
Marcely Cassimiro, Kaline Romeiro, Luciana Gominho, Andressa de Almeida, Larissa Costa, Diana Albuquerque
BACKGROUND: This study aims to evaluate the frequency of dentinal defects after root canal preparation with the ProTaper NEXT, K3XF and WaveOne GOLD systems using microcomputed tomography. METHODS: Sixty permanent mandibular incisors with a single canal were selected. Inspection of the teeth was performed under a stereomicroscope (15x) to observe the presence of pre-existing cracks and fractures lines. Samples were divided into three experimental groups (n = 20): ProTaper NEXT (PTN), K3XF (K3XF) and WaveOne GOLD (WOG)...
June 2, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28571262/evaluation-of-microleakage-with-total-etch-self-etch-and-universal-adhesive-systems-in-class-v-restorations-an-in-vitro-study
#13
Anjali Gupta, Pradeep Tavane, Pankaj Kumar Gupta, Bellam Tejolatha, Ashik Ali Lakhani, Ram Tiwari, Shruti Kashyap, Gaurav Garg
INTRODUCTION: Adhesive dentistry is overwhelmingly evolving with respect to the dental surgeon's and patient's perspective. Embracing the concept of minimally invasive dentistry which follows minimum intervention performed to produce good adhesion and tooth coloured restoration, in turn makes the newer generation bonding agents more acceptable and appropriate withstanding the demand for stable restoration. AIM: To study and compare the extent of microleakage between tooth and restoration interface in class V composite resin restorations applying one Total Etch (Adper(TM) single bond), two Self Etch (Adper(TM) SE Plus, Adper(TM) Easy One) and Universal bonding agents using dye penetration method...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28569444/multiple-adhesive-layering-influence-on-dentin-bonding-and-permeability
#14
Edilausson Moreno Carvalho, Rodrigo Stanislawczuk, Thays Costa, Sandra Kiss Moura, Alessandro Loguercio, Jose Bauer
The aim was to evaluate the effect of the number of layers on the microtensile bond strength (μTBS), permeability and nanoleakage of an etch-and-rinse adhesive (Adper Single Bond 2). Different numbers of layers (1, 2 and 4) were applied on dentin susbstrate. Specimens were obtained and tested for μTBS. Stick-shaped samples were analysed by scanning electron microscope, to observe silver nitrate penetration. One-way ANOVA and Tukey tests were applied (α=0.05) for μTBS values. The fracture mode was evaluated under a stereomicroscope and a scanning electron microscope (SEM)...
March 2017: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28566855/assessment-of-bracket-surface-morphology-and-dimensional-change
#15
Pillai Devu Radhakrishnan, N K Sapna Varma, V V Ajith
OBJECTIVE: The objective of this study was to compare the surface morphology and dimensional stability of the bracket slot at the onset of treatment and after 12 months of intraoral exposure. The study also compared the amount of calcium at the bracket base which indicates enamel loss among the three orthodontic brackets following debonding after 12 months of intraoral exposure. MATERIALS AND METHODS: The sample consisted of 60 (0.022" MBT) canine brackets. They were divided into three groups: self-ligating, ceramic bracket with metal slot, and stainless steel (SS) brackets...
January 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/28553346/exenatide-promotes-regeneration-of-injured-rat-sciatic-nerve
#16
Ersin Kuyucu, Bilal Gümüs, Oytun Erbas, Fatih Oltulu, Arslan Bora
Damage to peripheral nerves results in partial or complete dysfunction. After peripheral nerve injuries, a full functional recovery usually cannot be achieved despite the standard surgical repairs. Neurotrophic factors and growth factors stimulate axonal growth and support the viability of nerve cells. The objective of this study is to investigate the neurotrophic effect of exenatide (glucagon like peptide-1 analog) in a rat sciatic nerve neurotmesis model. We injected 10 μg/d exenatide for 12 weeks in the experimental group (n = 12) and 0...
April 2017: Neural Regeneration Research
https://www.readbyqxmd.com/read/28552287/mechanical-properties-and-internal-fit-of-4-cad-cam-block-materials
#17
Alexis Goujat, Hazem Abouelleil, Pierre Colon, Christophe Jeannin, Nelly Pradelle, Dominique Seux, Brigitte Grosgogeat
STATEMENT OF PROBLEM: Recent polymer-based computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials have been commercialized for inlay restorations, a polymer-infiltrated ceramic-network (PICN) and composite resin nanoceramics. Little independent evidence regarding their mechanical properties exists. Internal adaptation is an important factor for the clinical success and longevity of a restoration, and data concerning this parameter for inlays made with these blocks are scarce...
May 26, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28549540/micro-computed-tomography-of-false-starts-produced-on-bone-by-different-hand-saws
#18
Guido Pelletti, Guido Viel, Paolo Fais, Alessia Viero, Sindi Visentin, Diego Miotto, Massimo Montisci, Giovanni Cecchetto, Chiara Giraudo
The analysis of macro- and microscopic characteristics of saw marks on bones can provide useful information about the class of the tool utilized to produce the injury. The aim of the present study was to test micro-computed tomography (micro-CT) for the analysis of false starts experimentally produced on 32 human bone sections using 4 different hand-saws in order to verify the potential utility of micro-CT for distinguishing false starts produced by different saws and to correlate the morphology of the tool with that of the bone mark...
May 2017: Legal Medicine
https://www.readbyqxmd.com/read/28545869/evaluation-of-marginal-fit-of-single-implant-supported-metal-ceramic-crowns-prepared-by-using-presintered-metal-blocks
#19
Barış Paşalı, Duygu Saraç, Necati Kaleli, Yakup Sinasi Saraç
STATEMENT OF PROBLEM: Recently, presintered metal blocks for nonprecious and precious metal implant-supported restorations have gained popularity in computer-aided design and computer-aided manufacturing (CAD-CAM) systems. However, few studies have evaluated the marginal discrepancy of implant-supported restorations made with these new alloy systems. PURPOSE: The purpose of this in vitro study was to compare the milling-sintering method with the lost-wax and milling methods in terms of the marginal fit of implant-supported metal-ceramic restorations...
May 23, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28544968/clinical-usefulness-of-videocapillaroscopy-and-selected-endothelial-cell-activation-markers-in-people-with-type-1-diabetes-mellitus-complicated-by-microangiopathy
#20
Anna Kuryliszyn-Moskal, Wieslaw Zarzycki, Artur Dubicki, Diana Moskal, Bozena Kosztyła-Hojna, Anna Hryniewicz
PURPOSE: Microvascular abnormalities are one of the most important causes of persistent diabetic complications. The aim of our study was to compare microvascular changes examined by nailfold videocapillaroscopy (NVC) examination with serum concentrations of vascular endothelial growth factor (VEGF), soluble thrombomodulin (sTM) and endothelin-1 (ET-1) in people with Type 1 diabetes with and without microangiopathy. MATERIAL/METHODS: The study included 106 people with Type 1 diabetes and 40 healthy controls...
May 22, 2017: Advances in Medical Sciences
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