966 resultados para PINOS DENTÁRIOS


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La campaña educativa Vigilad los pinos se preparó para dar a conocer uno de los problemas más graves que afectaban a la calidad de los pinares y de los pinos de los jardines y patios: la procesioraria del pino. En este folleto se encuentran muchos datos sobre esta especie, su vida y costumbres, como se defiende, de qué se alimenta y cómo puede afectar a los seres humanos. También se recogen algunos aspectos de la lucha contra la plaga. Igualmente cuenta con diapositivas ilustrativas y una ficha para el alumnado.

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The work presents the effect of plasma treatment when applied in fibers or carbon/glass posts in the adhesion fiber/resin and posts/cement. This has for objective the modification of the surface of the fibers, as well as the wettability of the posts, seeking the improvement of the adhesion and of the connection fiber/resin in the processing of polymeric composites reinforced with the same ones. 120 posts (Reforpost) were used and 30 meters of fibers of carbon and of glass (Fibrex), of the company Angelus. The samples were divided in three groups of 40 specimens: GROUP I - 20 posts of glass fiber and 20 of carbon without treatment to it shapes, GROUP II -20 posts of glass fiber and 20 of carbon treated to it shapes in the surface and GROUP III - 20 posts of glass fiber and 20 of carbon make with fibers in natura after plasma treatment. The plasma treatment was accomplished with oxygen and with temperature in the camera fixed at 200°C, for one hour of exhibition. The posts and the fibers were characterized before and after the treatment. The wettability was measure by pendent drop method, and interface fiber/resin and posts/cement were observed by optical and electronic microscopy. It was observed that both wettability and texture were increased with plasma treatment

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Relata-se um caso de fratura de tíbia em uma bezerra de sete meses de idade, 200kg de peso, apresentando fratura fechada, cominutiva em diáfise. A fixação externa foi preferida como método de imobilização óssea, utilizando-se pinos transcorticais e gesso sintético. Obteve-se eficiente imobilização da fratura, com rápida recuperação do animal, dispendendo-se pouco tempo para o pós-operatório (52 dias). A técnica demonstrou ser de fácil realização e passível de ser executada a campo.

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In recent years there has been a significant growth in technologies that modify implant surfaces, reducing healing time and allowing their successful use in areas with low bone density. One of the most widely used techniques is plasma nitration, applied with excellent results in titanium and its alloys, with greater frequency in the manufacture of hip, ankle and shoulder implants. However, its use in dental implants is very limited due to high process temperatures (between 700 C o and 800 C o ), resulting in distortions in these geometrically complex and highly precise components. The aim of the present study is to assess osseointegration and mechanical strength of grade II nitrided titanium samples, through configuration of hollow cathode discharge. Moreover, new formulations are proposed to determine the optimum structural topology of the dental implant under study, in order to perfect its shape, make it efficient, competitive and with high definition. In the nitriding process, the samples were treated at a temperature of 450 C o and pressure of 150 Pa , during 1 hour of treatment. This condition was selected because it obtains the best wettability results in previous studies, where different pressure, temperature and time conditions were systematized. The samples were characterized by X-ray diffraction, scanning electron microscope, roughness, microhardness and wettability. Biomechanical fatigue tests were then conducted. Finally, a formulation using the three dimensional structural topology optimization method was proposed, in conjunction with an hadaptive refinement process. The results showed that plasma nitriding, using the hollow cathode discharge technique, caused changes in the surface texture of test specimens, increases surface roughness, wettability and microhardness when compared to the untreated sample. In the biomechanical fatigue test, the treated implant showed no flaws, after five million cycles, at a maximum fatigue load of 84.46 N. The results of the topological optimization process showed well-defined optimized layouts of the dental implant, with a clear distribution of material and a defined edge

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The odontogenic myxoma shares cellular and structural aspects with dental papilla, which has been implicated as probable origin of this neoplasm. The aim of the present study was to perform a comparative immunohistochemical analysis for the expression of collagenase-1 (MMP-1) and gelatinases A (MMP-2) and B (MMP-9) in odontogenic myxomas and dental papilla of teeth germs. Twelve cases of odontogenic myxomas and eight specimens of teeth germs were selected. It was taken into consideration the presence or absence of immunoreactivity, the pattern of immunohistochemical distribution of proteases within extracellular matrix, as well as, the number of cells revealing immunostaining for matrix metalloproteinases (MMPs). It was verified a significant difference (p<0,05) in relation to MMP-2 immunoexpression, which was observed only within extracellular matrix of myxomas. Nevertheless, MMP-1 labeling was revealed by most of the cases of odontogenic myxoma, at levels close to those observed in dental papilla. In relation to the pattern of distribution, a significant difference was obtained between specimens (p<0,05), with neoplasms predominantly exhibiting a focal pattern for MMP-1. The quantitative analysis of neoplastic cells labeled for MMPs denoted a significant difference (p<0,05), demonstrating a higher proportion of MMP-1 in comparison to MMPs-2 and -9. It can be concluded that immunohistochemical expression of MMP-1 at levels comparable to those observed in dental papilla and quantitatively superior in relation to MMPs-2 and -9, suggest an implication of this protease on extracellular matrix degradation of odontogenic myxomas. Moreover, the possibility of interactions with receptors involved in cellular adhesion, particularly with integrins, suggests a plausible function on local invasiveness of such neoplasms. Additionally, the presence of a descent immunoexpression gradient for these MMPs on odontogenic myxomas, associated to substrate specificity inherent in each enzyme, suggest the existence of a coordinated mechanism between interstitial collagenase and gelatinases A and B in order to allow an efficient degradation of extracellular matrix and local invasion by neoplastic cells

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OBJETIVO: Discutir os aspectos das urgências odontológicas relacionadas aos traumatismos dentários, disponibilizando mais informações para médicos pediatras ou plantonistas de serviços de atendimento de urgências e emergências. FONTES DE DADOS: O levantamento dos dados foi realizado na base de dados Pubmed e Bireme, selecionando os artigos dos últimos 13 anos. As palavras-chave utilizadas foram: traumatismo dentário, dente decíduo e dente permanente. Os critérios de inclusão utilizados foram: artigos em inglês e português sobre incidência, prevalência e etiologia, guias de procedimentos e casos clínicos apenas de traumatismo dentário, sendo excluídos artigos de clareamento de dentes traumatizados, traumas faciais ósseos e casos clínicos de acompanhamento reduzido. SÍNTESE DOS DADOS: Os dados foram descritos de forma concisa para se tornar um guia de fácil leitura e rápido acesso em relação à conduta, necessidade de atendimento imediato e correta escolha de soluções para armazenagem dos dentes e fragmentos. CONCLUSÕES: O conhecimento sobre o assunto, a agilidade no tratamento de urgência e o correto encaminhamento do paciente proporcionam melhor prognóstico.

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Para o presente trabalho, 235 crianças pertencentes às creches da Prefeitura Municipal de Araraquara foram avaliadas e moldadas com um dispositivo confeccionado com cera utilidade e palito abaixador de língua na forma dos arcos dentários. No intervalo de um ano as mesmas crianças foram remoldadas afim de se verificar se houveram ou não mudanças nas dimensões do arco dentário decíduo. A partir da obtenção dos modelos em gesso, foram realizadas medições por meio de um dispositivo digitalizador tridimensional denominado MicroScribe-3DX nos instantes inicial (primeira moldagem) e final (moldagem após um ano). Foram avaliadas medidas referentes às distâncias inter-segundos molares, interprimeiros molares, intercaninos, perímetro, comprimento de arco e espaços primatas. Consideraram-se ainda dimorfismo sexual, tipo de arco e influência de hábitos. Concluiu-se que as dimensões transversais sofreram aumento significativo na dentadura decídua, enquanto que o perímetro, o comprimento e os espaços primatas permaneceram constantes. As distâncias intermolares apresentaram dimorfismo sexual, com dimensões maiores no gênero feminino. Com relação às medidas de perímetro, comprimento e espaços primatas não ocorreram diferenças significantes em relação ao gênero. As dimensões de comprimento nos arcos não diferem nos arcos decíduos Tipo I e Tipo II de Baume, enquanto que o diâmetro dos arcos Tipo I de Baume, são maiores do que os do Tipo II. Os hábitos de sucção de dedo e chupeta não provocaram alterações nas dimensões dos arcos decíduos no período observado, de um ano.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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The authors studied 201 school children form both sexes, aging 12 to 14 years, in order to identify anodontia, including in third molars. The results indicated a congenital absence of teeth in 24.37% of the examined children, distributed into 10.44% of boys and 13.93% of girls. Anodontia was observed concerning third molar teeth and other teeth, and the correlation was calculated by the total, sex, and hemiarch. The data were presented and discussed, and the results included several conclusions.

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Objective: To evaluate the influence of three adhesive systems on the bond strength of fiber post luted to root dentine. The hypothesis was that the bond strength is influenced by the adhesive system. Method: The canals of thirty single-root bovine roots (16mm in length) were prepared using the preparation drill (FGM) until 12mm. 14 mm of each root was embedded with acrylic resin and the specimens were allocated into three groups (n=10), considering the factor adhesive (3 levels): Gr1- Scotchbond Multipurpose Plus (3M ESPE), Gr2- One Step (Bisco) and Gr3- Excite DSC (Ivoclar Vivadent). The adhesive systems were applied using a microbrush, according to the manufacture's recommendations. The fiber posts (White Post DC, FGM) were luted with dual resin cement (All-Cem,FGM). After, the cores with composite resin (Llis, FGM) were made and each set of root/post/core was submitted to the mechanical cycling (Erios, Brazil) (10 6 cycles, 84N, 4 Hz, inclination of 45 o, 37 oC, water). Each specimen was cut in 4 samples (1.8mm in thickness), which were submitted to the push-out test in a universal testing machine (ServoPulser - Shimadzu) (50Kgf, 1mm/min). The data (MPa) were analyzed using ANOVA (1-way) and Tukey test (5%). Results: The factor adhesive (P=0.00352) influenced the bond strength significantly (ANOVA). Gr1 (6.8±3.8 MPa) a presented higher bond strength values than Gr2 (3.1±1.5 MPa) b and similar to Gr3 (4.4±3.3) a,b. Moreover, Gr3 and Gr2 were similar between them (Tukey). The hypothesis was accepted. Conclusion: Based on the results it was concluded that chemical and dual polymerization adhesive system should be used for the adhesive luting fiber post procedures.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)