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Previous issue date: 2005 / Buscou-se com esta pesquisa estabelecer a influ?ncia da diatomita, uma rocha sedimentar, rica em s?lica, encontrada em abund?ncia nas bacias rasas nordestinas, sobre uma resina odontol?gica comercial Z250TM quando agregada ? mesma. Para tal foi necess?ria a caracteriza??o dos precursores: 1)resina comercial atrav?s de calorimetria explorat?ria diferencial (DSC), termogravimetria (TG), espectroscopia na regi?o infra-vermelho (IV) e fluoresc?ncia de raios X e 2)diatomita atrav?s de difra??o de raios X (DRX), calorimetria explorat?ria diferencial (DSC), termogravimetria (TG), espectroscopia na regi?o do infra-vermelho (IV), an?lise t?rmica diferencial (DTA), an?lise qu?mica, an?lise de ?rea superficial pelo m?todo BET, an?lise do tamanho de part?culas. Deu-se ent?o a confec??o das amostras controle (material de partida, ou seja, resina comercial Z250) e das amostras teste (material de partida acrescido de diatomita). Realizou-se tamb?m ensaios mec?nicos (resist?ncia ? compress?o, resist?ncia ? tra??o diametral resist?ncia ao desgaste em micr?metros, avalia??o da microdureza e da rugosidade superficial) e uma nova caracteriza??o das amostras controle e teste (termogravimetria (TG), an?lise t?rmica diferencial (DTA), difra??o de raios X (DRX), microscopia ?tica (MO) e microscopia eletr?nica de varredura (MEV). Surgiu ent?o como produto deste trabalho, um material restaurador odontol?gico in?dito, com todas propriedades mec?nicas superiores ?s do material de partida, de custo acess?vel por utilizar mat?ria prima regional, sintetizado e caracterizado atrav?s da interrela??o dos conhecimentos da Odontologia e da Engenharia de Materiais, e que se presta tanto para ?reas est?ticas, como para ?reas que demandem maiores esfor?os mastigat?rios. / The aim of this work was established the diatomite effect, being it a sedimentary stone, with a lot of silic, founded at rivers margins of North East from Brasil, about a commercial odontological composite resin Z250TM after added both. The precursors characterization carried out by: 1)commercial odontological composite resin: differential exploratory calorimetry (DSC), termogravimetric analysis (TG), spectroscopy in the infra red region (FTIR) and X-ray fluorescence e; 2)diatomite: X-ray diffraction (DRX), differential exploratory calorimetry (DSC), termogravimetric analysis (TG), spectroscopy in the infra red region (FTIR), differential thermal analysis (DTA), chemical analysis, superficial area analysis (BET), particle size analysis. There was beginning the control samples prepare (initial material or commercial odontological composite resin Z250) and tests samples (initial material added diatomite). There was made too mechanical evaluations (resistance to compression, diametrical tension, abrasion, micro hardness and its superficial roughness) and another samples control and tests characterization by termogravimetric analysis (TG), differential thermal analysis (DTA), X-ray diffraction (DRX), optical microscopy (MO) and scanning electronic microscopy(MEV). The final product from this search was a unpublished odontological restorative material, with all mechanical properties better than initial material, minus expensive in order to use regional materia prima, made and caracterizated by the interrelation of know ledges from Odontology and Materials Tecnology. This new material may be used both aesthetical areas and great mastication efforts areas.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/21403 |
| Date | January 2005 |
| Creators | Lima, Isabela Pinheiro Cavalcanti |
| Contributors | Seabra , Eduardo Gomes, Melo, Marcus Antonio de Freitas, Melo, Marcus Antonio de Freitas, Melo, Dulce Maria de Ara?jo |
| Publisher | Ci?ncia e Engenharia de Materiais, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| 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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