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Endodontic irrigants from a comprehensive perspective

World Journal of Clinical Cases 2024年第21期12卷 4460-4468页

作者： Rayana Duarte Khoury Lara Steffany de Carvalho mauro felipe rios do nascimento Fadi Alhussain AmjadAbu Hasna Department of Restorative Dentistry Endodontics DivisionInstitute of Science and TechnologySão Paulo State UniversitySão Josédos Campos 12245000SPBrazil Department of Biosciences and Oral Diagnosis Institute of Science and TechnologySão Paulo State UniversitySão Josédos Campos 12245000SPBrazil School of Dentistry The National Institute of Higher Education and Postgraduate Studies Padre Gervásio-INAPÓSPouso Alegre 37550-121MGBrazil School of Dentistry Syrian Private UniversityAl Kiswah 877C+P2DamascusSyria School of Dentistry Universidad Espíritu SantoSamborondón 092301Ecuador

This review article explores the fundamental principles of modern endodontics with a focus on root canal cleaning and *** reviews commonly used endodontic irrigant,namely sodium hypochlorite(NaOCl),herbal extracts,chlorhexidine(CHX),and chelating agents,highlighting their properties,applications,and potential ***,a key antimicrobial agent,demonstrates effectiveness against various microorganisms but poses challenges such as high *** extracts,gaining recognition in endodontics,present an alternative with potential advantages in preserving dentin ***,known for its broad-spectrum antimicrobial activity,is discussed in both liquid and gel formulations,emphasizing its role in reducing smear layer formation and preserving hybrid layer *** agents,specifically ethylenediaminetetraacetic acid and citric acid,play a vital role in removing the smear layer,enhancing dentin permeability,and facilitating the penetration of antimicrobial *** review article underscores the importance of careful application and consideration of each irrigant's properties to ensure safe and effective endodontic *** serves as a valuable guide for clinicians in selecting appropriate irrigants based on specific treatment requirements.

关键词： Root canal irrigants Sodium hypochlorite Chlorhexidine Chelating agents Plant extracts

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Mechanical Characterization and Micro-Wear of FeB-Fe<sub>2</sub>B Layers on Boriding AISI D2 and AISI 4340 Steels

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Materials Sciences and Applications 2021年第7期12卷 330-344页

作者： Suellen Terroso de Mendonça Ferreira André Luiz Klemes Bacco Eduardo mauro do nascimento Carlos Maurício Lepienski Programa de Pós Graduaç ã o em Engenharia e Materiais (PPGEM) Universidade Tecnológica Federal do Paraná (UTFPR) Curitiba Brasil

The mechanical behavior and wear of the different hardened phases with bore-induced changes in AISI 4340 and AISI D2 steels were investigated. The hardness and modulus of elasticity were measured by nanoindentation and the values obtained for the layers in AISI D2 steel were 18 GPa and 325 GPa in the Fe2B boride phase, and 20 GPa and 360 GPa in the FeB boride phase, respectively. The AISI 4340 steel presented mainly the Fe2B phase. It was then possible to analyze the coefficient of friction obtained in the Fe2B phase of the steel AISI 4340 presented a range of 0.04 to 0.06. The AISI D2 steel presents two different phases in the boride layer being the coefficient of friction higher for the test in the FeB phase than for Fe2B, and the values vary from 0.065 to 0.075. These parameters were obtained with micro-wear tests. No adhesion failures were observed after the sliding tests in the interface of the two different boride layers. Cracks in the FeB phase after the sliding test were much more frequent.

关键词： Iron Boride Micro-Wear Test Mechanical Properties Boriding

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Single-Phase Velocity Determination Based in Video and Sub-Images Processing:An Optical Flow Method Implemented with Support of a Programmed MatLab Structured Script

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Journal of Software Engineering and Applications 2015年第6期8卷 290-294页

作者： Andreas nascimento Edson Da Costa Bortoni José Luiz Goncalves Pedro Antunes Duarte mauro Hugo Mathias Departamento de Mecanica Faculdade de EngenhariaCampus de Guaratinguetá(FEG)Universidade Estadual Paulista(UNESP)GuaratinguetáBrazil Universidade Federal de Itajubá(UNIFEI) ItajubáBrazil

Important in many different sectors of the industry, the determination of stream velocity has become more and more important due to measurements precision necessity, in order to determine the right production rates, determine the volumetric production of undesired fluid, establish automated controls based on these measurements avoiding over-flooding or over-production, guaranteeing accurate predictive maintenance, etc. Difficulties being faced have been the determination of the velocity of specific fluids embedded in some others, for example, determining the gas bubbles stream velocity flowing throughout liquid fluid phase. Although different and already applicable methods have been researched and already implemented within the industry, a non-intrusive automated way of providing those stream velocities has its importance, and may have a huge impact in projects budget. Knowing the importance of its determination, this developed script uses a methodology of breaking-down real-time videos media into frame images, analyzing by pixel correlations possible superposition matches for further gas bubbles stream velocity estimation. In raw sense, the script bases itself in functions and procedures already available in MatLab, which can be used for image processing and treatments, allowing the methodology to be implemented. Its accuracy after the running test was of around 97% (ninety-seven percent);the raw source code with comments had almost 3000 (three thousand) characters;and the hardware placed for running the code was an Intel Core Duo 2.13 [Ghz] and 2 [Gb] RAM memory capable workstation. Even showing good results, it could be stated that just the end point correlations were actually getting to the final solution. So that, making use of self-learning functions or neural network, one could surely enhance the capability of the application to be run in real-time without getting exhaust by iterative loops.

关键词： Optical Flow Single-Phase Velocity Video and Image Processing Sensing MatLab Script

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Conception of a Web Operation System for Processing Petroleum Related Drilling Data: A Focus on Pre-Salt Real-Time Automation and Optimization

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Journal of Software Engineering and Applications 2019年第4期12卷 61-71页

作者： Yuri Soares Pinheiro Lucas Campos Vieira Andreas nascimento Francisco de Assis Souza dos Santos mauro Hugo Mathias Gerhard Thonhauser Asad Elmgerbi Julian Hunt Department of Engineering and Technology Petroleum Engineering Programs Universidade Federal do Espirito Santo (UFES/DETEC) Sao Mateus Brazil Department of Computational and Electronics Universidade Federal do Espirito Santo (UFES/DCEL) Sao Mateus Brazil Department of Petroleum Engineering Chair of Drilling and Completion Engineering Montanuniversit&#228 t Leoben (MUL/DPE/CDC) Leoben Austria International Institute of Applied System Analysis (IIASA/ASA-ENE) Laxenburg Austria Mechanic Department Faculty of Engineering Universidade Estadual Paulista (UNESP/FEG-DME/PRH48-ANP) Guaratingueta Brazil

Petroleum and Natural Gas still represent a considerable share in terms of energy consumption in the current global matrix, so that its exploration/exploitation is present in the market and driving activities in locations of specific complexities, as the ones along unconventional hydrocarbon resources from the Brazilian pre-salt. The daily cost of well drilling under harsh conditions can exceed US $1 million a day, turning any type of downtime or necessary maintenance during the activities to be very costly, moment in which processes optimization starts to be a key factor in costs reduction. Thus, new technologies and methods in terms of automating and optimizing the processes may be of great advantages, having its impact in total related project costs. In this context, the goal of this research is to allow a computation tool supporting achieving a more efficient drilling process, by means of drilling mechanics parameters choosiness aiming rate of penetration (ROP) maximization and mechanic specific energy (MSE) minimization. Conceptually, driven by the pre-operational drilling test curve trends, the proposed system allows it to be performed with less human influences and being updateable automatically, allowing more precision and time reduction by selecting optimum parameters. A Web Operating System (Web OS) was designed and implemented, running in online servers, granting accessibility to it with any device that has a browser and internet connection. It allows processing the drilling parameters supplied and feed into it, issuing outcomes with optimum values in a faster and precise way, allowing reducing operating time.

关键词： Trend Curves Web OS Optimization Pre-Salt Petroleum

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