White Portland Cement
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Polymicrobial Leakage and Retention of MTA and Portland Cement in a Model of Apexification
Abstract Objective: To evaluate the sealing capacity and retention of apical barriers made with mineral trioxide aggregate (MTA) and Portland cement (PC). Material and Methods: Fifty-six bovine incisors were sectioned 8 mm above and 12 mm below the cement-enamel junction. The root canal was enlarged with a diamond drill to create a standard 2.5 mm diameter
Pesqui. Bras. Odontopediatria Clín. Integr.. Publicado em: 13/01/2020
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2. CONVERSION OF SPENT FAT OIL INTO LIQUID AND GASEOUS FUELS THROUGH CLINKER CATALYZED PYROLYSIS
Abstract Repeated heating of fat oil may result in the formation of highly toxic aldehyde compounds. The oils having such compounds are considered as health hazards and therefore their repeated use is banned in many countries. Since huge quantities of the used oil need urgent disposal, this work is focused on the disposal of used oil for the resource recover
Braz. J. Chem. Eng.. Publicado em: 30/09/2019
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3. Propriedades das argamassas de revestimento contendo resíduo proveniente da produção do TiO2 (MNR)
Resumo Nesse trabalho avaliou-se a influência da adição do resíduo da produção de TiO2, minério não reagido (MNR), nas propriedades de argamassas de revestimento. Para isso, avaliaram-se as propriedades de argamassas mistas (cimento Portland branco e cal) com adições de 0%, 5%, 10% e 15% de MNR, em relação à massa do cimento. As argamassas foram
Cerâmica. Publicado em: 15/08/2019
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4. Comportamiento del residuo de vidrio molido en cementos mezcla: Estudio comparativo con microsilice
ABSTRACT Due their high content of silica in an amorphous state the glass, in theory, can behave as pozzolanic material when are finely ground. This opens up an interesting way of reusing these materials in the Portland cement industry (CP), especially considering that solid urban waste (RSU) in Argentina contains between 3 and 5% by weight of glass. This pa
Matéria (Rio J.). Publicado em: 05/03/2018
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5. Effect of addition of nano-hydroxyapatite on physico-chemical and antibiofilm properties of calcium silicate cements
ABSTRACT Objective Mineral Trioxide Aggregate (MTA) is a calcium silicate cement composed of Portland cement (PC) and bismuth oxide. Hydroxyapatite has been incorporated to enhance mechanical and biological properties of dental materials. This study evaluated physicochemical and mechanical properties and antibiofilm activity of MTA and PC associated with z
J. Appl. Oral Sci.. Publicado em: 2016-06
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6. Radiopacity and cytotoxicity of Portland cement associated with niobium oxide micro and nanoparticles
Objective Mineral Trioxide Aggregate (MTA) is composed of Portland Cement (PC) and bismuth oxide (BO). Replacing BO for niobium oxide (NbO) microparticles (Nbµ) or nanoparticles (Nbη) may improve radiopacity and bioactivity. The aim of this study was to evaluate the radiopacity and cytotoxicity of the materials: 1) PC; 2) White MTA; 3) PC+30% Nbµ; 4) PC
J. Appl. Oral Sci.. Publicado em: 2014-12
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7. Influence of bismuth oxide concentration on the pH level and biocompatibility of white Portland cement
Objectives: To investigate if there is a relation between the increase of bismuth oxide and the decrease of pH levels and an intensification of toxicity in the Portland cement. Material and Methods: White Portland cement (WPC) was mixed with 0, 15, 20, 30 and 50% bismuth oxide, in weight. For the pH level test, polyethylene tubes were filled with the ceme
J. Appl. Oral Sci.. Publicado em: 2014-07
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8. In Vitro Cytotoxicity of White MTA, MTA Fillapex® and Portland Cement on Human Periodontal Ligament Fibroblasts
Resumo O objetivo deste estudo foi comparar a citotoxicidade in vitro de agregado trióxido mineral (MTA) branco, MTA Fillapex® e cimento Portland (PC) em cultura de fibroblastos de ligamento periodontal humano. A cultura de fibroblastos de ligamento periodontal foi estabelecida e as células foram utilizadas para os testes citotóxicos após a quarta pass
Braz. Dent. J.. Publicado em: 2013-04
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9. Biocompatibility and setting time of CPM-MTA and white Portland cement clinker with or without calcium sulfate
Objective To evaluate the biocompatibility and the setting time of Portland cement clinker with or without 2% or 5% calcium sulfate and MTA-CPM. Material and Methods Twenty-four mice (Rattus norvegicus) received subcutaneously polyethylene tubes filled with Portland cement clinker with or without 2% or 5% calcium sulfate and MTA. After 15, 30 and 60 days o
J. Appl. Oral Sci.. Publicado em: 2013-02
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10. Influence of radiopacifying agents on the solubility, pH and antimicrobial activity of portland cement
The aim of this study was to evaluate the interference of the radiopacifiers bismuth oxide (BO), bismuth carbonate (BC), bismuth subnitrate (BS), and zirconiun oxide (ZO) on the solubility, alkalinity and antimicrobial properties of white Portland cement (WPC). The substances were incorporated to PC, at a ratio of 1:4 (v/v) and subjected to a solubility test
Braz. Dent. J.. Publicado em: 2012-10
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11. DESEMPENHO DO CIMENTO PORTLAND BRANCO COM ESCÓRIA DE ALTO-FORNO E ATIVADOR QUÍMICO FRENTE AO ATAQUE POR SULFATO DE SÓDIO / PERFORMANCE OF A WHITE PORTLAND CEMENT WITH SLAG AND CHEMICAL ACTIVATOR AGAINST SODIUM SULFATE ATTACK
Os íons sulfato, encontrados na água do mar, em águas subterrâneas e em águas residuárias são agentes agressivos que podem levar a uma severa degradação do concreto. Ao reagirem com os produtos de hidratação do cimento, dependendo do tipo de cátion a que estão associados (magnésio, cálcio, potássio, sódio, amônio, etc.), da concentração e
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/08/2011
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12. Estudo de métodos visando à análise direta de alumina, cimento e quartzo em ICP OES / Studies of methods aiming the direct analysis of alumina, cement and quartz by ICP OES
O objetivo deste estudo foi avaliar parâmetros para o desenvolvimento de métodos visando à determinação elementar em alumina, cimento e quartzo por espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES) com amostragem de suspensão. Alguns elementos foram investigados como possíveis candidatos a padrões internos (PIs) Be, Dy, G
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011