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Texto completo SciELO Brasil
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Id: lil-769822
Autor: SPYRIDES, Silvana Marques Miranda; PRADO, Maíra do; ARAUJO, Joyce Rodrigues de; SIMÃO, Renata Antoun; BASTIAN, Fernando Luis.
Título: Effects of plasma on polyethylene fiber surface for prosthodontic application
Fonte: J. appl. oral sci;23(6):614-622, Nov.-Dec. 2015. tab, graf.
Idioma: en.
Resumo: ABSTRACT Plasma technology has the potential to improve the adherence of fibers to polymeric matrices, and there are prospects for its application in dentistry to reinforce the dental particulate composite. Objectives This study aimed to investigate the effect of oxygen or argon plasma treatment on polyethylene fibers. Material and Methods Connect, Construct, InFibra, and InFibra treated with oxygen or argon plasma were topographically evaluated by scanning electron microscopy (SEM), and chemically by X-ray photoelectron spectroscopy (XPS). For bending analysis, one indirect composite (Signum) was reinforced with polyethylene fiber (Connect, Construct, or InFibra). The InFibra fiber was subjected to three different treatments: (1) single application of silane, (2) oxygen or argon plasma for 1 or 3 min, (3) oxygen or argon plasma and subsequent application of silane. The samples (25x2x2 mm), 6 unreinforced and 60 reinforced with fibers, were subjected to three-point loading tests to obtain their flexural strength and deflection. The results were statistically analyzed with ANOVA and the Bonferroni correction for multiple comparison tests. Results SEM analysis showed that oxygen and argon plasma treatments promote roughness on the polyethylene fiber surface. X-ray photoelectron spectroscopy (XPS) analysis shows that both plasmas were effective in incorporating oxygenated functional groups. Argon or oxygen plasma treatment affected the flexural strength and deflection of a fiber reinforced composite. The application of silane does not promote an increase in the flexural strength of the reinforced composites. Conclusions Oxygen and argon plasma treatments were effective in incorporating oxygenated functional groups and surface roughness. The highest strength values were obtained in the group reinforced with polyethylene fibers treated with oxygen plasma for 3 min.
Descritores: Argônio/química
Oxigênio/química
Plasma/química
Polietileno/química
-Análise de Variância
Resinas Compostas/química
Colagem Dentária/métodos
Teste de Materiais
Microscopia Eletrônica de Varredura
Espectroscopia Fotoeletrônica
Maleabilidade
Valores de Referência
Propriedades de Superfície
Silanos/química
Fatores de Tempo
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


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Texto completo SciELO Brasil
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Id: lil-752437
Autor: SARTORETTO, Suelen Cristina; ALVES, Adriana Terezinha Neves Novellino; RESENDE, Rodrigo Figueiredo Britto; CALASANS-MAIA, José; GRANJEIRO, José Mauro; CALASANS-MAIA, Mônica Diuana.
Título: Early osseointegration driven by the surface chemistry and wettability of dental implants
Fonte: J. appl. oral sci;23(3):279-287, May-Jun/2015. tab, graf.
Idioma: en.
Resumo: Objective The objective of this study was to investigate the impact of two different commercially available dental implants on osseointegration. The surfaces were sandblasting and acid etching (Group 1) and sandblasting and acid etching, then maintained in an isotonic solution of 0.9% sodium chloride (Group 2). Material and Methods X-ray photoelectron spectroscopy (XPS) was employed for surface chemistry analysis. Surface morphology and topography was investigated by scanning electron microscopy (SEM) and confocal microscopy (CM), respectively. Contact angle analysis (CAA) was employed for wetting evaluation. Bone-implant-contact (BIC) and bone area fraction occupied (BAFO) analysis were performed on thin sections (30 μm) 14 and 28 days after the installation of 10 implants from each group (n=20) in rabbits' tibias. Statistical analysis was performed by ANOVA at the 95% level of significance considering implantation time and implant surface as independent variables. Results Group 2 showed 3-fold less carbon on the surface and a markedly enhanced hydrophilicity compared to Group 1 but a similar surface roughness (p>0.05). BIC and BAFO levels in Group 2 at 14 days were similar to those in Group 1 at 28 days. After 28 days of installation, BIC and BAFO measurements of Group 2 were approximately 1.5-fold greater than in Group 1 (p<0.05). Conclusion The surface chemistry and wettability implants of Group 2 accelerate osseointegration and increase the area of the bone-to-implant interface when compared to those of Group 1. .
Descritores: Implantes Dentários
Implantação Dentária Endo-Óssea/métodos
Osseointegração/efeitos dos fármacos
Osseointegração/fisiologia
Titânio/química
-Condicionamento Ácido do Dente
Materiais Biocompatíveis
Teste de Materiais
Microscopia Confocal
Microscopia Eletrônica de Varredura
Espectroscopia Fotoeletrônica
Valores de Referência
Propriedades de Superfície/efeitos dos fármacos
Fatores de Tempo
Tíbia/efeitos dos fármacos
Molhabilidade
Limites: Animais
Feminino
Masculino
Coelhos
Tipo de Publ: Estudo de Avaliação
Responsável: BR1.1 - BIREME


  3 / 5 LILACS  
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Id: lil-684566
Autor: Journal of Applied Oral Science; Atsu, Saadet; KeskIn, Yasemin.
Título: Effect of silica coating and silane surface treatment on the bond strength of soft denture liner to denture base material
Fonte: J. appl. oral sci;21(4):300-306, Jul-Aug/2013. tab, graf.
Idioma: en.
Resumo: OBJECTIVE: This study investigated the effects of different surface treatments on the tensile bond strength of an autopolymerizing silicone denture liner to a denture base material after thermocycling. MATERIAL AND METHODS: Fifty rectangular heat-polymerized acrylic resin (QC-20) specimens consisting of a set of 2 acrylic blocks were used in the tensile test. Specimens were divided into 5 test groups (n=10) according to the bonding surface treatment as follows: Group A, adhesive treatment (Ufi Gel P adhesive) (control); Group S, sandblasting using 50-µm Al2O3; Group SCSIL, silica coating using 30-µm Al2O3 modified by silica and silanized with silane agent (CoJet System); Group SCA, silica coating and adhesive application; Group SCSILA, silica coating, silane and adhesive treatment. The 2 PMMA blocks were placed into molds and the soft lining materials (Ufi Gel P) were packed into the space and polymerized. All specimens were thermocycled (5,000 cycles) before the tensile test. Bond strength data were analyzed using 1-way ANOVA and Duncan tests. Fracture surfaces were observed by scanning electron microscopy. X-ray photoelectron spectrometer (XPS) and Fourier Transform Infrared spectrometer (FTIR) analysis were used for the chemical analysis and a profilometer was used for the roughness of the sample surfaces. RESULTS: The highest bond strength test value was observed for Group A (1.35±0.13); the lowest value was for Group S (0.28±0.07) and Group SCSIL (0.34±0.03). Mixed and cohesive type failures were seen in Group A, SCA and SCSILA. Group ...
Descritores: Bases de Dentadura
Reembasadores de Dentadura
Colagem Dentária/métodos
Materiais Dentários/química
Silanos/química
Dióxido de Silício/química
-Análise de Variância
Análise do Estresse Dentário
Teste de Materiais
Microscopia Eletrônica de Varredura
Espectroscopia Fotoeletrônica
Polimerização/efeitos dos fármacos
Reprodutibilidade dos Testes
Propriedades de Superfície
Resistência à Tração
Responsável: BR1.1 - BIREME


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Texto completo SciELO Chile
Landers, Richard
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Id: lil-676199
Autor: Muñante-Cárdenas, Jose Luis; Landers, Richard.
Título: Análisis químico y topográfico de la superfície de implantes dentarios mediante espectroscopia de fotoelectrones y microscopía electrónica de barrido: estudio preliminar / Chemical and topographic analysis of dental implant surfaces using photoelectron spectroscopy and scanning electron microscopy: preliminary study
Fonte: Int. j. odontostomatol. (Print);6(3):355-361, 2012. ilus, tab.
Idioma: es.
Resumo: El objetivo de este estudio fue analizar la composición química y la topografía superficial de implantes de titanio comercialmente puro, obtenidos de 3 marcas comerciales utilizadas actualmente en odontología. Fueron analizados 6 implantes de titanio de los siguientes sistemas: SIN, P-I philosophy y Neodent. Este material fue dividido en 3 grupos de 3 implantes cada uno. Para determinar la composición química de la superficie fue utilizada la técnica de Espectroscopia de Fotoelectrones Excitada por rayos-X (XPS), mientras que para caracterizar la topografía superficial fue utilizada Microscopia electrónica de barrido. Titanio, Carbono Silicio y Oxigeno fueron identificados en todas las muestras analizadas. Otros elementos contaminantes identificados fueron Silicio, Aluminio, azufre, plomo, Fósforo, Calcio, Sodio, Nitrógeno y Carbono. Fueron identificadas impurezas en la superficie de todos los implantes analizados. Consideramos necesarios otros estudios que relacionen permanentemente la presencia y concentración de estos elementos con el proceso de oseointegración...

The aim of this study was to analyze the chemical composition and surface topography of commercially pure titanium implants, obtained from 03 trademarks frequently used in dentistry. There were 9 titanium implants of the following systems: SIN, P-I philosophy and Neodent. These materials were divided into 3 groups, with 3 implants in each group. Photoelectron Spectroscopy Excited by X-ray (XPS) was used to determine the chemical composition, while to characterize the surface topography we used Scanning Electron Microscopy (SEM). Titanium, carbon silicon and oxygen were identified in all samples analyzed. Other contaminants were: silicon, aluminum, sulfur, lead, phosphorus, calcium, sodium, nitrogen and carbon. We identified impurities on the surface of all implants analyzed. We consider necessary to development more studies relating the presence and concentration of these elements with the osseointegration process...
Descritores: Implantes Dentários
Microscopia Eletrônica de Varredura
Espectroscopia Fotoeletrônica
Titânio/química
-Propriedades de Superfície
Limites: Humanos
Responsável: CL1.1 - Biblioteca Central


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Carvalho, Paulo Sérgio Perri de
Rosa, Adalberto Luiz
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Id: lil-552348
Autor: Carvalho, Daniel Rey de; Carvalho, Paulo Sérgio Perri de; Magro Filho, Osvaldo; Mello, José Daniel Biasoli de; Beloti, Márcio Mateus; Rosa, Adalberto Luiz.
Título: Characterization and in vitro cytocompatibility of an acid-etched titanium surface
Fonte: Braz. dent. j;21(1):3-11, Jan. 2010. ilus, tab.
Idioma: en.
Resumo: The aims of this study were to characterize the microstructure of a commercially pure titanium (cpTi) surface etched with HCl/H2SO4 (AE-cpTi) and to investigate its in vitro cytocompatibility compared to turned cpTi (T-cpTi). T-cpTi showed a grooved surface and AE-cpTi revealed a surface characterized by the presence of micropits. Surface parameters indicated that the AE-cpTi surface is more isotropic and present a greater area compared to T-cpTi. The oxide film thickness was similar between both surfaces; however, AE-cpTi presented more Ti and O and less C. Osteoblastic cell proliferation, alkaline phosphatase activity, and bone-like nodule formation were greater on T-cpTi than on AE-cpTi. These results show that acid etching treatment produced a surface with different topographical and chemical features compared to the turned one, and such surface modification affected negatively the in vitro cytocompatibility of cpTi as demonstrated by decreasing culture growth and expression of osteoblastic phenotype.

O objetivo deste estudo foi caracterizar a microestrutura de uma superfície de titânio comercialmente puro (cpTi) condicionada com HCl/H2SO4 (acid etched) (AE-cpTi) e investigar sua citocompatibilidade in vitro, comparada à do cpTi usinado (turned) (T-cpTi). O T-cpTi apresentou uma superfície com sulcos e o AE-cpTi exibiu uma superfície caracterizada pela presença de micro-vales. Os parâmetros de superfície indicaram que a superfície AE-cpTi é mais isotrópica e apresenta uma área maior quando comparada à superfície T-cpTi. A espessura da camada de óxido foi similar para as duas superfícies; no entanto, a AE-cpTi apresentou maiores quantidades de Ti e O e menor, de C. A proliferação de células osteoblásticas, a atividade de fosfatase alcalina e a formação de matriz mineralizada foram maiores na superfície T-cpTi que na AE-cpTi. Esses resultados mostram que o condicionamento ácido produziu uma superfície com características topográficas e químicas diferentes quando comparadas às da superfície usinada. Além disso, observou-se que essas modificações de superfície afetaram de forma negativa a citocompatibilidade in vitro do cpTi como demonstrado pela inibição da proliferação celular e da expressão do fenótipo osteoblástico.
Descritores: Condicionamento Ácido do Dente
Materiais Biocompatíveis/farmacologia
Materiais Dentários/farmacologia
Osteoblastos/efeitos dos fármacos
Titânio/farmacologia
-Fosfatase Alcalina/análise
Processo Alveolar/citologia
Materiais Biocompatíveis/química
Biomarcadores/análise
Células Cultivadas
Carbono/química
Adesão Celular/efeitos dos fármacos
Divisão Celular/efeitos dos fármacos
Proliferação de Células/efeitos dos fármacos
Sobrevivência Celular/efeitos dos fármacos
Materiais Dentários/química
Ácido Clorídrico/química
Interferometria
Teste de Materiais
Microscopia Eletrônica de Varredura
Osteogênese/efeitos dos fármacos
Fenótipo
Espectroscopia Fotoeletrônica
Propriedades de Superfície
Ácidos Sulfúricos/química
Titânio/química
Limites: Humanos
Tipo de Publ: Estudo Comparativo
Responsável: BR1.1 - BIREME



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