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Previous issue date: 2012-02-03 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The titanium and titanium alloys are widely used as biomaterial in biomedical device and so research have been developed aiming to improve and/or better to understand interaction biomaterial/biological environment. The process for manufacturing of this titanium implants usually involves a series of thermal and mechanical processes which have consequence on the final product. The heat treatments are usually used to obtain different properties for each application. In order to understand the influence of these treatments on the biological response of the surface, it was done, in this work, different heat treatments in titanium and analyzed their influence on the morphology, adhesion and proliferation of the pre-osteoblastic cells (MC3T3-E1). For such heat-treated titanium disks were characterized by optical microscopy, contact angle, surface energy, roughness, microhardness, X-ray diffraction and scanning through the techniques (BSE, EDS and EBSD). For the analysis of biological response were tested by MTT proliferation, adhesion by crystal violet and β1 integrin expression by flow cytometry. It was found that the presence of a microstructure very orderly, defined by a chemical attack, cells tend to stretch in the same direction of orientation of the material microstructure. When this order does not happen, the most important factor influencing cell proliferation is the residual stress, indicated by the hardness of the material. This way the disks with the highest level state of residual stress also showed increased cell proliferation / O tit?nio e suas ligas s?o amplamente utilizados como biomaterial em dispositivos biom?dicos e devido a isso pesquisas t?m sido desenvolvidas visando aperfei?oar e/ou compreender melhor a intera??o biomaterial/meio biol?gico. O processo de fabrica??o desses dispositivos de tit?nio geralmente envolve uma s?rie de processos t?rmicos e mec?nicos e que t?m consequ?ncias no produto final. Os tratamentos t?rmicos s?o usualmente utilizados para obten??o de propriedades diferenciadas para cada aplica??o. Com o intuito de entender a influ?ncia desses tratamentos sobre a resposta biol?gica da superf?cie, foram realizados, no presente trabalho, diferentes tratamentos t?rmicos em tit?nio e analisadas suas influ?ncias na morfologia, ades?o e prolifera??o de c?lulas pr?-osteobl?stica (MC3T3-E1). Para tanto os discos de tit?nio tratados termicamente foram caracterizados por microscopia ?tica, ?ngulo de contato, energia de superf?cie, rugosidade, microdureza Vickers, difra??o de raios-X e microscopia eletr?nica de varredura atrav?s das t?cnicas de EBS, EDS e EBSD. Para an?lise da resposta biol?gica foram realizados teste de prolifera??o por MTT, ades?o por cristal violeta e express?o da integrina β1 por citometria de fluxo. Foi verificado que na presen?a de uma microestrutura muito ordenada, definida atrav?s de um ataque qu?mico, as c?lulas tendem a se alongar no mesmo sentido da orienta??o microestrutural do material. Quando essa ordem n?o acontece, o fator mais importante a influenciar na prolifera??o celular ? a tens?o residual, indicada pela dureza do material. Deste modo os discos que apresentaram maior estado de tens?o residual apresentaram tamb?m maior prolifera??o celular
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12794 |
| Date | 03 February 2012 |
| Creators | Macedo, Haroldo Reis Alves de |
| Contributors | CPF:09621199468, http://lattes.cnpq.br/7441669258580942, Barbosa, Carlos Augusto Galv?o, CPF:67269621420, http://lattes.cnpq.br/5004397230198722, Guerra Neto, Cust?dio Leopoldino Brito, CPF:46658564434, http://lattes.cnpq.br/5387010100082241, Rocha, Hugo Alexandre de Oliveira, CPF:76111830449, http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4799567J8&dataRevisao=null, Lima, Jos? de Anchieta, CPF:36973637434, http://lattes.cnpq.br/0742445504420593, Caram J?nior, Rubens, CPF:04227245800, http://lattes.cnpq.br/1091025573756924, Alves J?nior, Clodomiro |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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