Fluid Filtration
Mostrando 1-12 de 262 artigos, teses e dissertações.
-
1. Method for Cleaning Back-Produced Water from Polymer Flooding Operations to Determine Polymer Molar Mass Using Size-Exclusion Chromatography
One of the methods used by the oil industry to increase production is to inject water, containing polymer, into the reservoir. The viscosity of the aqueous solution is primarily responsible for the efficiency of this method, and is achieved using polymers with high molar mass. However, polymer degradation can occur during pumping and fluid displacement in th
J. Braz. Chem. Soc.. Publicado em: 2020-12
-
2. Avaliação de amidos modificados empregados na mineração para aplicação em fluidos de perfuração de poços de petróleo
RESUMO Amidos e seus derivados são utilizados em praticamente todos os setores industriais. Na indústria petrolífera podem ser empregados como aditivos controladores de filtrado, os quais controlam eficazmente a perda de fluido para a formação rochosa adjacente. O presente trabalho teve como objetivo avaliar o uso de amidos, de mandioca e de milho, util
Matéria (Rio J.). Publicado em: 16/09/2019
-
3. Evaluación reológica de fluidos de perforación base agua con nanosílice
ABSTRACT Generally, drilling fluids may be defined as fluids with a composition that can assist the generation and removal of cuttings from the borehole to the surface. They are classified according to their base as water based mud (WBM), oil based mud (OBM) or gas. Polymers, densifiers, brines, surfactants, among others are the primary components of drillin
Matéria (Rio J.). Publicado em: 19/07/2018
-
4. Drying protocol influence on the bond strength and apical sealing of three different endodontic sealers
Abstract The aim of this study was to evaluate the influence of drying protocols (DP) on the apical sealing (AS) and on the bond strength (BS) of teeth filled with different sealers. The root canals of one hundred and fifty-six roots of maxillary canines were prepared with Reciproc rotary files (R50). The teeth were randomly divided into four groups (n = 39)
Braz. oral res.. Publicado em: 20/05/2016
-
5. Apical microleakage of different root canal sealers after use of maleic acid and EDTA as final irrigants
This study aimed to compare the effects of ethylenediaminetetraacetic acid (EDTA) and maleic acid (MA) on the sealing ability of various root canal sealers. Eighty root canals were instrumented and irrigated with either EDTA or MA. They were divided into eight experimental groups and obturated as follows: Group 1: MA + Hybrid Root SEAL/gutta-percha. Group 2:
Braz. oral res.. Publicado em: 15/09/2014
-
6. Apical adaptation, sealing ability and push-out bond strength of five root-end filling materials
This study compared the fluid filtration, adaptation to the root canal walls, and the push-out bond strength of two resin-based sealers and three calcium silicate-based retrograde filling materials. Fifty maxillary canines were shaped using manual instruments and the apical portion was sectioned. Retrograde cavities of 3-mm depth were prepared. The specimens
Braz. oral res.. Publicado em: 26/08/2014
-
7. Lack of correlation between tubular dentine cement penetration, adhesiveness and leakage in roots filled with gutta percha and an endodontic cement based on epoxy amine resin
Objective: To analyze possible correlations among tubular dentine cement penetration, adhesiveness and apical leakage in fillings performed with gutta percha and an endodontic cement based on epoxy amine resin. Material and Methods: Sixty similar, extracted human mandibular central incisors were irrigated, instrumented and filled following the same pr
J. Appl. Oral Sci.. Publicado em: 2014-01
-
8. Structural and fluid dynamic characterization of calcium carbonate-based porous ceramics
The aim of this work was to experimentally evaluate the use of calcium carbonate as a pore-generating agent in ceramic compositions. Compositions that contained 50% kaolin, 20% limestone, and different concentrations of quartz and feldspar were prepared by uniaxial pressing. Samples were heat-treated at a heating rate appropriate to induce calcium carbonate
Mat. Res.. Publicado em: 10/09/2013
-
9. Bond strength to root dentin and fluid filtration test of AH Plus/gutta-percha, EndoREZ and RealSeal systems
OBJECTIVES: To investigate the bond strength and seal ability produced by AH Plus/gutta-percha, EndoREZ and RealSeal systems to root canal dentin. MATERIAL AND METHODS: Sixty extracted single-root human teeth, instrumented manually to size 40, were divided into three groups (n=20) according to the sealer used; G1: AH Plus, G2: EndoREZ, and G3: RealSeal
J. Appl. Oral Sci.. Publicado em: 2013-07
-
10. Lack of correlation between obturation limits and apical leakage
The aim of this paper was to evaluate a possible correlation between obturation limits and leakage. Thirty-six extracted human mandibular incisors were used, characterized by straight and single canals, non-anatomical complexities, absence of previous endodontic treatment, complete root formation and patent forame
Braz. oral res.. Publicado em: 2013-07
-
11. Apical sealing of root canal fillings performed with five different endodontic sealers: analysis by fluid filtration
OBJECTIVES: To evaluate the sealing ability of five root canal sealers, including two experimental cements (MBP and MTA-Obtura) using the fluid filtration method. MATERIAL AND METHODS: Teeth were divided into 5 study groups: G1-AH Plus; G2-Acroseal; G3Sealapex; G4-MBP; G5-MTA-Obtura; and two controls. Chemical-mechanical preparation was performed with ProFil
J. Appl. Oral Sci.. Publicado em: 03/06/2011
-
12. Evaluation of three instrumentation techniques at the precision of apical stop and apical sealing of obturation
OBJECTIVE: The aim of this study was to investigate the ability of two NiTi rotary apical preparation techniques used with an electronic apex locator-integrated endodontic motor and a manual technique to create an apical stop at a predetermined level (0.5 mm short of the apical foramen) in teeth with disrupted apical constriction, and to evaluate microleakag
J. Appl. Oral Sci.. Publicado em: 03/06/2011