A carregar...
Publicação
Reparação de compósito: efeito de diferentes tratamentos de superfície num compósito nanoparticulado através de visualização ao SEM
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 2.57 MB | Adobe PDF |
Orientador(es)
Resumo(s)
A reparação de compósitos é um tema amplamente documentado e, é cada vez mais uma opção relativamente à substituição completa da restauração no intuito de aumentar a longevidade das restaurações. Um procedimento indispensável na reparação é o tratamento de superfície, porém ainda não existe consenso quanto ao método e ao protocolo mais eficazes. Objectivo: este estudo in vitro teve como objectivo avaliar as alterações de superfície provocadas por diferentes tratamentos de superfície, numa resina nanoparticulada. Materiais e métodos: Foi testado um compósito nanoparticulado Filtek XT (3M ESPE, St Paul, Minnesota, EUA), a partir do qual se obtiveram 15 amostras que foram polidas e seguidamente colocas na incubadora a 37º durante 24 horas. As amostras foram divididas aleatoriamente em 5 grupos. O grupo 1 foi apenas exposto a água destilada e, nos seguintes onde foram aplicados respectivamente os tratamentos: ácido fosfórico a 35%, broca diamantada, jacto de óxido de alumínio partículas de 50 μm e jacto de bicarbonato de sódio. Todos os espécimes foram observados ao SEM. Resultados: As amostras onde foi aplicado jacto de óxido de alumínio demonstraram mais irregularidades, macro e micro retenções comparativamente aos outros métodos avaliados. Conclusão: A aplicação de tratamento de superfícies originou irregularidades nas amostras dos quatro grupos quando comparadas com as amostras expostas a água destilada, através da observação ao microscópio electrónico varrimento.
Composite repair is a widely documented subject and there is a growing trend towards repairing restorations instead of complete removal in order to increase longevity of restorations. Surface treatment is needed step in repair, although there´s no consensus about the most effective method and protocol. Objective: the purpose of this study was to evaluate the morphological effects of different surface treatment methods on nanofilled composite. Materials and methods: In this study was tested a nanofilled composite Filtek XT (3M ESPE, St Paul, Minnesota, EUA), from wich were obtained 15 samples that were polished and stored on distilled water at 37º for 24 hours. The samples were randomly distributed in five groups. Group 1 was just stored to distilled water and to the other groups received surface treatment with phosphoric acid 35%, diamond bur, air abrasion with 50 aluminum oxide and air abrasion with sodium bicarbonate. All specimens were observed using SEM. Results: Samples sandblasted with air abrasion aluminum oxide showed more irregularities, macro and micro retentions in comparison with other methods of surface treatment. Conclusion: Surface treatment created an irregular and rough surface in samples of all four groups compared with the smaples of these materials exposed to destilled water trough observation by scaning elctron microscope.
Composite repair is a widely documented subject and there is a growing trend towards repairing restorations instead of complete removal in order to increase longevity of restorations. Surface treatment is needed step in repair, although there´s no consensus about the most effective method and protocol. Objective: the purpose of this study was to evaluate the morphological effects of different surface treatment methods on nanofilled composite. Materials and methods: In this study was tested a nanofilled composite Filtek XT (3M ESPE, St Paul, Minnesota, EUA), from wich were obtained 15 samples that were polished and stored on distilled water at 37º for 24 hours. The samples were randomly distributed in five groups. Group 1 was just stored to distilled water and to the other groups received surface treatment with phosphoric acid 35%, diamond bur, air abrasion with 50 aluminum oxide and air abrasion with sodium bicarbonate. All specimens were observed using SEM. Results: Samples sandblasted with air abrasion aluminum oxide showed more irregularities, macro and micro retentions in comparison with other methods of surface treatment. Conclusion: Surface treatment created an irregular and rough surface in samples of all four groups compared with the smaples of these materials exposed to destilled water trough observation by scaning elctron microscope.
Descrição
Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2011
Palavras-chave
Dentisteria operatória Teses de mestrado - 2011