Base de dados : LILACS
Pesquisa : G02.860 [Categoria DeCS]
Referências encontradas : 1084 [refinar]
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Id: biblio-951972
Autor: Bortolatto, Janaina Freitas; Dantas, Andrea Abi Rached; Roncolato, Ávery; Merchan, Hugo; Floros, Michael Christopher; Kuga, Milton Carlos; Oliveira Junior, Osmir Batista de.
Título: Does a toothpaste containing blue covarine have any effect on bleached teeth? An in vitro, randomized and blinded study
Fonte: Braz. oral res. (Online);30(1):e33, 2016. tab.
Idioma: en.
Resumo: Abstract The objective of this study was to analyze the effect of bleaching toothpastes, both conventional and those containing the new whitening agent Blue Covarine, on teeth previously bleached by conventional techniques (in-office and at-home). Squared bovine enamel/dentin blocks (6.0 x 6.0 x 2.0 mm) were randomly distributed in 6 groups (n = 15), according to the technique used to bleach them (in-office: HP35%; at-home: PC10%) and the type of bleaching toothpaste (none: control; Blue Covarine containing: BC; and without Blue Covarine: NBC). Experimental groups denominated HP35%, HP35%BC and HP35%NBC received in-office tooth bleaching before toothbrushing, and groups PC10%, PC10%BC and PC10%NBC were subjected to at-home tooth bleaching prior to toothbrushing. After bleaching treatment, groups HP35%BC, PC10%BC, HP35%NBC and PC10%NBC underwent daily tooth brushing in a brushing machine for 3 minutes (150 strokes/min, with a load of 375 g). Tooth color alteration was measured by reflectance spectroscopy (Vita EasyShade, Vident, Brea, CA, USA) at: T0 (baseline) - after in-office or at-home bleaching treatment; T1 - immediately after tooth brushing; T2 - 7 days and T3 - 14 days after tooth brushing. Data was analyzed by repeated measures mixed ANOVA and the Bonferroni post hoc test, with a significance level of 5%. Statistically significant differences were found between different experimental groups, evaluation times and for the interaction between them (p < 0.001). Tooth brushing using either bleaching toothpaste (conventional or with Blue Covarine) showed no color alteration on teeth previously bleached by in-office and at-home tooth bleaching. The use of bleaching toothpastes on previously bleached teeth did not produce a color alteration.
Descritores: Clareamento Dental/métodos
Cremes Dentais/química
Dentifrícios/química
Isoindóis/química
Clareadores Dentários/química
Metaloporfirinas/química
-Valores de Referência
Propriedades de Superfície/efeitos da radiação
Fatores de Tempo
Escovação Dentária
Distribuição Aleatória
Método Simples-Cego
Cor
Esmalte Dentário/efeitos dos fármacos
Esmalte Dentário/química
Dentina/efeitos dos fármacos
Dentina/química
Peróxido de Hidrogênio/química
Limites: Animais
Bovinos
Tipo de Publ: Estudo Clínico
Responsável: BR1.1 - BIREME


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Id: biblio-951974
Autor: Tawse-Smith, Andrew; Kota, Akash; Jayaweera, Yathen; Vuuren, Wendy Jansen van; Ma, Sunyoung.
Título: The effect of standardised implantoplasty protocol on titanium surface roughness: an in-vitro study
Fonte: Braz. oral res. (Online);30(1):e137, 2016. tab, graf.
Idioma: en.
Resumo: Abstract: To analyse the changes of surface characteristics of machined and moderately roughened titanium disks following a standardised implantoplasty protocol. Forty titanium discs (machined: n = 20; moderately roughened: n = 20) were instrumented with one half of each disc maintained as the control (non-instrumented). The standardised implantoplasty protocol was carried out using a custom jig with the sequential change of burs: 1) Regular grit diamond [10s], 2) Super-fine grit diamond [10s], 3) Brownie(tm) silicone polisher [15s], 4) Greenie(tm) silicone polisher [15s]. Surface topography was analysed using confocal laser scanning microscopy (CLSM) and scanning electron microscopy (SEM). Energy dispersive x-ray spectroscopy (EDS) was used to measure the elemental profiles of each disc. Quantitative analysis showed similar changes in level of roughness between the machined and moderately roughened titanium discs. CLSM demonstrated an increased roughness (Ra and Sa values) after polishing with a regular grit diamond bur when compared to the uninstrumented surfaces. Although the roughness decreased after the further polishing with the super-fine grit diamond bur, subsequent instrumentation using silicon burs tended to increase the roughness, albeit being statistically insignificant. There was a residue of silicon particles despite the irrigation after each polishing stage. The proposed implantoplasty protocol did not achieve a sufficient level of smoothness on the machined or moderately roughened titanium surfaces when compared to the Ra threshold. Further research is recommended to test the efficacy of each bur on titanium surfaces with longer duration using actual oral implants to allow better comparison.
Descritores: Titânio/química
Polimento Dentário/métodos
-Valores de Referência
Espectrometria por Raios X
Propriedades de Superfície
Teste de Materiais
Microscopia Eletrônica de Varredura
Diamante/química
Estatísticas não Paramétricas
Microscopia Confocal
Responsável: BR1.1 - BIREME


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Id: biblio-951975
Autor: Meincke, Débora Könzgen; Ogliari, Aline de Oliveira; Ogliari, Fabrício Aulo.
Título: Influence of different fillers on the properties of an experimental vinyl polysiloxane
Fonte: Braz. oral res. (Online);30(1):e36, 2016. tab, graf.
Idioma: en.
Projeto: FINEP/Brazil.
Resumo: Abstract The aim of the study was to evaluate the effect of the incorporation of different fillers on an experimental vinyl polysiloxane (VPS) at two different concentrations, 20% and 40%. Different fillers were added to an experimental VPS. The study was developed in two stages: (i) incorporation of fillers in different concentrations: (a) 20 wt% fillers, and (b) 40 wt%. The fillers were added to experimental VPS and mixed with a speed mixer; (ii) characterization of experimental VPS; after the base paste and catalyst paste were mixed, the experimental VPS was used to make specimens specifically for each test, which were stored at 23°C for 24 hours. The tests were designed according to the specific standardization for the analysis of tensile strength, detail reproduction, Shore A hardness, and elastic recovery. For analysis of filler size pattern, scanning electron microscopy at 1500× magnification was used. The aerosil OX-50 40% (AE), and pure aluminum hydroxide 40% (PAH) groups presented the highest tensile strength and Shore A hardness values. However, those were the only groups that did not present continuous detail reproduction of an intersection of 20 μm line. The elastic recovery was not statistically significant. The undesirable characteristics of VPS (lowest Shore A hardness and tensile strength) were observed when it was added to the composition of acrylic polymer (AP) and fiberglass (FG) in both concentrations, 20% and 40%. In groups AE and PAH, agglomerates of nanofillers were shown in SEM micrography, while the other groups presented different shapes and fillers sizes.
Descritores: Polivinil/química
Siloxanas/química
Materiais para Moldagem Odontológica/química
-Tamanho da Partícula
Valores de Referência
Propriedades de Superfície
Resistência à Tração
Fatores de Tempo
Teste de Materiais
Microscopia Eletrônica de Varredura
Reprodutibilidade dos Testes
Análise de Variância
Elasticidade
Testes de Dureza
Tipo de Publ: Research Support, Non-U.S. Gov't
Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Id: biblio-951976
Autor: Medeiros, Maria Isabel Dantas de; Carlo, Hugo Lemes; Lacerda-Santos, Rogério; Lima, Bruno Alessandro Guedes de; Souza, Frederico Barbosa de; Rodrigues, Jonas Almeida; Carvalho, Fabiola Galbiatti de.
Título: Thickness and nanomechanical properties of protective layer formed by TiF4 varnish on enamel after erosion
Fonte: Braz. oral res. (Online);30(1):e75, 2016. tab, graf.
Idioma: en.
Resumo: Abstract The layer formed by fluoride compounds on tooth surface is important to protect the underlying enamel from erosion. However, there is no investigation into the properties of protective layer formed by NaF and TiF4 varnishes on eroded enamel. This study aimed to evaluate the thickness, topography, nanohardness, and elastic modulus of the protective layer formed by NaF and TiF4 varnishes on enamel after erosion using nanoindentation and atomic force microscopy (AFM). Human enamel specimens were sorted into control, NaF, and TiF4 varnish groups (n = 10). The initial nanohardness and elastic modulus values were obtained and varnishes were applied to the enamel and submitted to erosive challenge (10 cycles: 5 s cola drink/5 s artificial saliva). Thereafter, nanohardness and elastic modulus were measured. Both topography and thickness were evaluated by AFM. The data were subjected to ANOVA, Tukey's test and Student's t test (α = 0.05). After erosion, TiF4 showed a thicker protective layer compared to the NaF group and nanohardness and elastic modulus values were significantly lower than those of the control group. It was not possible to measure nanohardness and elastic modulus in the NaF group due to the thin protective layer formed. AFM showed globular deposits, which completely covered the eroded surface in the TiF4 group. After erosive challenge, the protective layer formed by TiF4 varnish showed significant properties and it was thicker than the layer formed by NaF varnish.
Descritores: Fluoreto de Sódio/química
Titânio/química
Erosão Dentária/prevenção & controle
Cariostáticos/química
Esmalte Dentário/efeitos dos fármacos
Fluoretos/química
-Valores de Referência
Saliva Artificial/química
Propriedades de Superfície
Fatores de Tempo
Teste de Materiais
Bebidas Gaseificadas
Reprodutibilidade dos Testes
Análise de Variância
Estatísticas não Paramétricas
Microscopia de Força Atômica
Módulo de Elasticidade
Testes de Dureza
Limites: Humanos
Responsável: BR1.1 - BIREME


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Id: biblio-951981
Autor: Sedrez-Porto, José Augusto; Münchow, Eliseu Aldrighi; Brondani, Lucas Pradebon; Cenci, Maximiliano Sergio; Pereira-Cenci, Tatiana.
Título: Effects of modeling liquid/resin and polishing on the color change of resin composite
Fonte: Braz. oral res. (Online);30(1):e88, 2016. tab, graf.
Idioma: en.
Resumo: Abstract Modeling liquids/resins have been used to build up resin composite (RC) restorations, although there is a lack of information regarding their effects on the color stability of the latter. Therefore, the purpose of the present study was to evaluate the effects of the presence of modeling liquid between layers of RC and the finishing/polishing state of the material on color change in specimens exposed to red wine staining over time. Specimens were prepared by placing four increments (±0.5 mm thick) of RC (Filtek™ Z350 XT, 3M ESPE) into molds; half of which were prepared by applying modeling liquid (Scotchbond™ Multi-Purpose™ Adhesive, SBMP, 3M ESPE) between the layers of RC, whereas the other half were prepared without SBMP (control). Light-activation was performed after application of the final RC layer using a light-emitting diode (Radii, SDI) curing unit with an irradiance of 900 mW/cm2 for 20 s. Each group was divided according to the surface finishing protocol (n = 7): nothing (non-polished) or polishing with Sof-Lex™/diamond paste (polished). Initial colors of the specimens were evaluated with a digital spectrophotometer and the CIEL*a*b* color system. The specimens were stored in wine (37°C) for 12 months, and the color measurements were reassessed after 4, 6, and 12 months of storage. Scanning electron microscopy (SEM) analysis was performed at the end. Data were analyzed using ANOVA and Tukey's test (α = 5%). The presence of SBMP resulted in lower overall color change of the RC as compared with the control. The non-polished specimens exhibited a significantly higher color change than the polished specimens. SEM images corroborated the previous findings. In summary, the use of modeling liquid between layers of RC shows potential for application to reduce or delay the staining process of RC over time. Moreover, polishing is essential to provide increased color stability of the RC restoration.
Descritores: Pigmentação em Prótese/métodos
Resinas Compostas/química
Polimento Dentário/métodos
-Espectrofotometria/métodos
Propriedades de Superfície/efeitos dos fármacos
Fatores de Tempo
Teste de Materiais
Microscopia Eletrônica de Varredura
Análise de Variância
Cor
Colorimetria
Cimentos de Resina/química
Cura Luminosa de Adesivos Dentários
Luzes de Cura Dentária
Responsável: BR1.1 - BIREME


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Id: biblio-951965
Autor: Pereira, Rodrigo Dantas; Brito-Júnior, Manoel; Faria-E-Silva, André Luis; Guimarães, Karine Rodrigues; Mendes, Laís de Oliveira; Soares, Carlos José; Sousa-Neto, Manoel Damião.
Título: Does MTA affect fiber post retention in repaired cervical root canal perforations?
Fonte: Braz. oral res. (Online);30(1):e83, 2016. tab, graf.
Idioma: en.
Resumo: Abstract This study evaluated the effect of mineral trioxide aggregate (MTA) on the retention of fiber posts in repaired root canal perforations. Ten-millimeter post spaces were prepared in 60 endodontically treated bovine incisors. Root perforations were created in half of the root canals in the cervical area prior to being filled with white MTA-Angelus. Fiber posts were luted into the root canals with two self-adhesive (RelyX Unicem or Set) or self-etching (Panavia F) resin cements. The posts were submitted to a pull-out test, and the data were submitted to two-way ANOVA and Tukey's post hoc tests (α = 0.05). The fiber posts exhibited reduced retention in MTA-repaired root canal perforations, regardless of the type of resin cement that was used (p < 0.001). Self-adhesive resin cements provided higher bond strength values than Panavia F, while no difference was observed between RelyX Unicem and Set (p > 0.05). The presence of MTA in repaired root perforations negatively affected post retention. In addition, self-adhesive cements seemed to be the best option to lute fiber posts within a root canal in these cases.
Descritores: Óxidos/química
Materiais Restauradores do Canal Radicular/química
Obturação do Canal Radicular/métodos
Técnica para Retentor Intrarradicular
Retenção em Prótese Dentária
Silicatos/química
Compostos de Cálcio/química
Compostos de Alumínio/química
Cavidade Pulpar/efeitos dos fármacos
-Propriedades de Superfície
Teste de Materiais
Microscopia Eletrônica de Varredura
Reprodutibilidade dos Testes
Cimentação/métodos
Cimentos de Resina/química
Dentina/efeitos dos fármacos
Combinação de Medicamentos
Limites: Animais
Bovinos
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Id: biblio-951953
Autor: Caporossi, Leonardo Stephan; Dutra, Danilo Antonio Milbradt; Martins, Maritieli Righi; Prochnow, Emilia Pithan; Moreira, Carlos Heitor Cunha; Kantorski, Karla Zanini.
Título: Combined effect of end-rounded versus tapered bristles and a dentifrice on plaque removal and gingival abrasion
Fonte: Braz. oral res. (Online);30(1):e37, 2016. tab, graf.
Idioma: en.
Resumo: Abstract Two previous clinical studies evaluated the effect of end-rounded versus tapered bristles of soft manual brushes on the removal of plaque and gingival abrasion. However, the combined effect of an abrasive dentifrice on these outcomes has yet to be understood. The purpose of the present study was to compare the incidence of gingival abrasion and the degree of plaque removal obtained after the use of toothbrushes with tapered or end-rounded bristles in the presence or absence of an abrasive dentifrice. The study involved a randomized, single-blind, crossover model (n = 39) with a split-mouth design. Subjects were instructed to refrain from performing oral hygiene procedures for 72 hours. Quadrants were randomized and subjects brushed with both types of toothbrushes using a dentifrice (relative dentin abrasion = ± 160). Plaque and gingival abrasion were assessed before and after brushing. After 7 days, the experiment was repeated without the dentifrice. The average reduction in plaque scores and the average increase in the number of abrasion sites were assessed by repeated-measures ANOVA and Bonferroni's post-hoc tests. End-rounded bristles removed significantly more plaque than tapered bristles, regardless of the use of a dentifrice. The dentifrice did not improve plaque removal. In the marginal area (cervical free gingiva), no difference in the incidence of gingival abrasion was detected between toothbrush types when used with a dentifrice (p ≥ 0.05). However, the dentifrice increased the incidence of abrasion (p < 0.001), irrespective of the toothbrush type tested. End-rounded bristles therefore removed plaque more effectively without causing a higher incidence of gingival abrasion when compared with tapered bristles. An abrasive dentifrice can increase the incidence of abrasion, and should be used with caution by individuals who are at risk of developing gingival recession.
Descritores: Escovação Dentária/instrumentação
Dispositivos para o Cuidado Bucal Domiciliar
Placa Dentária/terapia
Dentifrícios/química
Gengiva/química
-Higiene Bucal/efeitos adversos
Propriedades de Superfície
Escovação Dentária/efeitos adversos
Microscopia Eletrônica de Varredura
Métodos Epidemiológicos
Resultado do Tratamento
Dentifrícios/efeitos adversos
Desenho de Equipamento
Retração Gengival/etiologia
Limites: Humanos
Masculino
Feminino
Adulto
Adulto Jovem
Tipo de Publ: Ensaio Clínico Controlado Aleatório
Responsável: BR1.1 - BIREME


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Id: biblio-952001
Autor: Alencar, Catarina Ribeiro Barros de; Mendonça, Fernanda Lyrio; Guerrini, Luísa Belluco; Jordão, Maisa Camillo; Oliveira, Gabriela Cristina de; Honório, Heitor Marques; Magalhães, Ana Carolina; Rios, Daniela.
Título: Effect of different salivary exposure times on the rehardening of acid-softened enamel
Fonte: Braz. oral res. (Online);30(1):e104, 2016. tab, graf.
Idioma: en.
Projeto: Financial Research Support Foundation of the state of Sao Paulo.
Resumo: Abstract This in situ study assessed the effect of different times of salivary exposure on the rehardening of acid-softened enamel. Bovine enamel blocks were subjected in vitro to a short-term acidic exposure by immersion in 0.05 M (pH 2.5) citric acid for 30 s, resulting in surface softening. Then, 40 selected eroded enamel blocks were randomly assigned to 10 volunteers. Intraoral palatal appliances containing 4 enamel blocks were constructed for each volunteer, who wore the appliance for 12 nonconsecutive hours: initial 30 min, followed by an additional 30, and then by an additional 1 hour. For the last additional 10 hours the appliances were used at night, during the volunteers' sleep. Surface hardness was analyzed in the same blocks at baseline, after erosion and after each period of salivary exposure, enabling percentage of surface hardness recovery calculation (%SHR). The data were tested using repeated measures ANOVA and Tukey's test (α = 0.05). Increasing periods of salivary action promoted a progressive increase in the surface hardness (p < 0.001). However a similar degree of enamel rehardening (p = 0.641) was observed between 2 hours (49.9%) and 12 hours (53.3%) of salivary exposure. Two hours of salivary exposure seems to be appropriate for partial rehardening of the softened enamel surface. The use of the intraoral appliance during sleep did not improve the enamel rehardening after erosion.
Descritores: Saliva/química
Erosão Dentária/prevenção & controle
Remineralização Dentária
Esmalte Dentário/química
-Saliva/fisiologia
Propriedades de Superfície
Fatores de Tempo
Distribuição Aleatória
Análise de Variância
Estatísticas não Paramétricas
Ácido Cítrico/química
Esmalte Dentário/efeitos dos fármacos
Voluntários Saudáveis
Testes de Dureza
Limites: Humanos
Animais
Masculino
Feminino
Adulto
Bovinos
Adulto Jovem
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Id: biblio-951996
Autor: Rosa, Raydsa Raíssa Moura; Calazans, Francielle Karoline Santos; Nogueira, Ruchele Dias; Lancellotti, Ailla Carla Rocha Acosta; Gonçalves, Luciano de Sousa; Geraldo-Martins, Vinícius Rangel.
Título: Effects of different desensitizing treatments on root dentin permeability
Fonte: Braz. oral res. (Online);30(1):e111, 2016. tab, graf.
Idioma: en.
Resumo: Abstract The objective of this study was to evaluate the effects of diode laser and a desensitizing dentifrice on dentin permeability. Fifty-two root dentin fragments were obtained (5 × 5mm) and treated with 24% EDTA gel. The samples were divided into 4 groups (n = 13): G1, control (no treatment); G2, diode laser (λ = 908 nm, 1.5 W, continuous mode, 20s); G3, application of abrasive dentifrice for 1 minute (Elmex Sensitive Professional (International Gaba); and G4, application of abrasive dentifrice for 1 minute followed by irradiation with diode laser. Ten samples per group were immersed in 2% methylene blue solution for 4h. The specimens were washed, longitudinally sectioned, observed under optical microscopy, photographed and assessed based on the degree of dye leakage. The remaining samples were observed under scanning electron microscopy (SEM). The leakage data were subjected to ANOVA test, followed by Tukey's t-test (α = 5%). Groups 2, 3 and 4 showed less dye penetration than the control group (p < 0.05), but were similar among each other. SEM images showed that dentinal tubules were open in G1, and fused and occluded in G2. Group 3 showed dentinal tubules that were occluded by the metal ions from the toothpaste. G4 presented similar characteristics to G3, and the presence of fused dentin. The diode laser and the dentifrice were effective in reducing dentinal permeability, and the combination of the two treatments did not show better results than either one used alone.
Descritores: Raiz Dentária/efeitos dos fármacos
Dentifrícios/química
Dentina/efeitos dos fármacos
Permeabilidade da Dentina/efeitos dos fármacos
Sensibilidade da Dentina/tratamento farmacológico
Dessensibilizantes Dentinários/química
-Propriedades de Superfície/efeitos dos fármacos
Propriedades de Superfície/efeitos da radiação
Fatores de Tempo
Raiz Dentária/efeitos da radiação
Microscopia Eletrônica de Varredura
Distribuição Aleatória
Reprodutibilidade dos Testes
Dentina/efeitos da radiação
Permeabilidade da Dentina/efeitos da radiação
Terapia a Laser/métodos
Lasers Semicondutores/uso terapêutico
Limites: Animais
Bovinos
Responsável: BR1.1 - BIREME


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Id: biblio-952018
Autor: Jordão-Basso, Keren Cristina Fagundes; Kuga, Milton Carlos; Bandéca, Matheus Coêlho; Duarte, Marco Antonio Hungaro; Guiotti, Flávia Angélica.
Título: Effect of the time-point of acid etching on the persistence of sealer residues after using different dental cleaning protocols
Fonte: Braz. oral res. (Online);30(1):e133, 2016. tab, graf.
Idioma: en.
Resumo: Abstract: Endodontic sealer residues remaining within the pulp chamber dentin after root canal obturation and cleaning with various solvents may compromise the appearance and the durability of dental restorations. Acid etching is routinely performed prior to application of dentine adhesive systems, but is effect on residual sealer material and the optimal time-point for performing etching, are unknown. Here, we evaluated the effect of acid etching on the dentin surface when performed either immediately or 7 days after removal of the endodontic sealer with two solvents, i.e., 95% ethanol or xylol. Forty crowns fragments from bovine incisors were impregnated with sealer and divided into 4 groups (n = 10 each), according to the dentin cleaning protocol and to the acid etching time-point: G1, 95.0% ethanol and immediate acid etching; G2, xylol and immediate acid etching; G3, 95.0% ethanol and acid etching after 7 days; and G4, xylol and acid etching after 7 days. Scanning electron microscopy (SEM) images (2000 ×) were obtained from each specimen and the number of open dentinal tubules counted and compared. Another 40 fragments were similarly prepared, and SEM images were obtained (500 ×) to score and compare the persistence of sealer residues on the dentin. G4 showed the most open dentinal tubules and the least epoxy resin-based sealer residues on the dentin surface (p < 0.05). The least epoxy resin-based sealer residues was obtained when acid etching, using 37% phosphoric acid, was performed after 7 days after cleaning the dentin with xylol.
Descritores: Ácidos Fosfóricos/química
Materiais Restauradores do Canal Radicular/química
Condicionamento Ácido do Dente/métodos
Dentina/efeitos dos fármacos
Resinas Epóxi/química
-Valores de Referência
Solventes/química
Propriedades de Superfície
Fatores de Tempo
Microscopia Eletrônica de Varredura
Reprodutibilidade dos Testes
Cavidade Pulpar/efeitos dos fármacos
Limites: Animais
Bovinos
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME



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