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Previous issue date: 2014-03-17 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / At present, the material of choice for performing aesthetic dental prosthetic work is in the ceramic. Among them, the ceramic base of stabilized zirconia with 3% yttria (3Y - TZP) stand out for having excellent physical and mechanical properties. During the machining of blocks of zirconia in the laboratory to prepare the various types of prostheses, much of the material is given off in the form of powder, which is subsequently discarded. The waste of this material results in financial loss, reflecting higher final cost treatment for patients, as well as damage to the environment, thanks to the processes involved in the manufacture and disposal of the ceramic. This research, pioneered the recycling of zirconium oxide powder obtained during milling of dental crowns and bridges, we highlight the social and environmental aspects and aims to establish a protocol for the reuse of waste (powder of zirconia Zirkonzahn? system) discarded to obtain a new block of compacted zirconia to maintain the same mechanical and microstructural properties of commercial high-cost imported material. To compare with the commercial material, samples were uniaxially (20 MPa) and isostatically (100 MPa), and its mechanical and microstructural characterization was performed through tests of density, porosity, dilatometry, X-ray diffraction (XRD), hardness, fracture toughness, resistance to fracture electron microscopy (SEM) and analysis of grain size. The results observed in the samples were isostatically pressed similiares those obtained with samples from the commercial material demonstrating the viability of the process / Na atualidade, o material de escolha para execu??o de trabalhos prot?ticos est?ticos em odontologia ? o cer?mico. Dentre eles, as cer?micas a base de zirc?nia estabilizada com 3% de ?tria (3Y-TZP) se destacam por apresentarem excelentes propriedades f?sicas e mec?nicas. Durante a usinagem dos blocos de zirc?nia em laborat?rio para preparo dos diversos tipos de pr?tese, grande parte do material ? desprendida na forma de p?, que posteriormente ? descartado. O desperd?cio deste material resulta em preju?zo financeiro, refletindo em elevado custo final no tratamento para os pacientes, al?m de preju?zo para o meio ambiente, devido aos processos envolvidos na fabrica??o e descarte da cer?mica. Esta pesquisa, pioneira na reciclagem do p? de ?xido de zirc?nia obtido durante a fresagem de coroas e pontes dent?rias, destaca-se nos aspectos social e ambiental e tem como objetivo, estabelecer um protocolo de reaproveitamento de res?duos (p? de zirc?nia do sistema Zirkonzahn?) descartados para a obten??o de um novo bloco de zirc?nia compactado que mantenha as mesmas propriedades mec?nicas e microestruturais do material comercial importado de alto custo. Para comparar com o material comercial, as amostras foram prensadas uniaxialmente (20 MPa) e isostaticamente (100 MPa), e sua caracteriza??o mec?nica e microestrutural foi realizada atrav?s dos ensaios de densidade, porosidade aparente, dilatometria, difra??o de raios X (DRX), microdureza, tenacidade a fratura, resist?ncia a fratura, microscopia eletr?nica de varredura (MEV) e an?lise de tamanho de gr?o. Os resultados constatados nas amostras prensadas isostaticamente foram similiares ?queles obtidos com as amostras do material comercial demostrando a viabilidade do processo
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12866 |
| Date | 17 March 2014 |
| Creators | Silva, Yankel Bruno Fontes |
| Contributors | CPF:50580396720, http://lattes.cnpq.br/5460040602567184, Paskocimas, Carlos Alberto, CPF:06296687877, http://lattes.cnpq.br/2365059843175411, Furukava, Marciano, CPF:87110296849, http://lattes.cnpq.br/7046131809246694, Ramalho, Eduardo Galv?o, CPF:03605359418, http://lattes.cnpq.br/3006037569302325, Silva, Vamberto Monteiro da, CPF:67456863415, Acchar, Wilson |
| 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 | Portuguese |
| 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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