Recobrimentos cerâmicos bioativos pelo processo sol-gel sobre Ti c.p. modificado por laser empregados em implantes
Arquivos
Data
2007-06-18
Autores
Bini, Rafael Admar [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
A superfície do Ti c.p. foi modificada por feixe de Laser Nd:YAG e recoberta com compostos bioativos pelo método sol-gel, visando aplicações clínicas. As amostras de Ti c.p. foram irradiadas por Laser Nd:YAG pulsado em ar e pressão atmosférica, estabelecendo quatro condições de estudo. Os recobrimentos sobre as superfícies irradiadas foram realizados pelo método sol- gel, em que o sol foi preparado a partir dos precursores Ca(NO3)2.4H2O e H3PO4. Os filmes foram depositados por dip-coating e tratados termicamente por dois procedimentos (P1 e P2) com rampas de aquecimento diferentes, sendo que a temperatura final de sinterização foi de 700° C. As caracterizações das amostras foram realizadas pelas técnicas de análise térmica, microscopia eletrônica de varredura, difração de raios-X e espectroscopia no infravermelho com transformada de Fourier. Resultados da modificação por feixe de Laser mostraram que as quatro condições estabelecidas tiveram energia suficiente para promover a ablação na superfície irradiada. Verificou-se que não houve presença de nenhuma fase referente a nitretos de titânio e que é possível obter-se TiO, Ti3O e Ti6O com diferentes porcentagens, dependendo da fluência utilizada. Também se verificou que a modificação por Laser é um processo limpo e reprodutível, não deixando vestígios de contaminação. Pelos resultados dos recobrimentos bioativos, pode-se verificar a influência do tratamento térmico. As análises mostraram para o procedimento térmico 1 a formação de uma mistura de fases, CPP e ß-TCP, enquanto no procedimento 2 obteve-se HA e ß-TCP. Em todos os recobrimentos, utilizando-se o procedimento térmico 2, conseguiu-se transformar a superfície bioinerte do titânio para uma bioativa constituída de cerâmicas de fosfato de cálcio de interesse biológico. Portanto, esse...
The c.p. Ti surface was modified by Laser Nd:YAG and compounds bioactives coating by sol-gel method, seeking clinical applications. The samples of c.p. Ti were irradiated byLaser Nd:YAG pulsed in air and atmospheric pressure, establishing four study conditions. The coatings, on the irradiated surfaces, were carried through by the sol- gel method, where the sol was prepared starting from the precursors Ca(NO3)2.4H2O and H3PO4. The coatings were deposited by dip-coating and treated termically by two procedures with heating ramps different (P1 and P2), and final temperature was 700° C. The characterizations of the samples were carried through by SEM, XRD and FT-IR. Results of the modification by laser beam showed that the four established conditions suggested have enough energy to promote the ablation in the irradiated surface. It was verified that there was not presence of any phase regarding nitretes of titanium and that it is possible to obtain TiO, Ti3O and Ti6O with different percentages, depending on the fluency used. Also, it is verified that the modification for Laser is a clean process, not leaving tracks of contamination, important characteristic for clinical applications. For the results of the bioactives coatings , the influence of thermal treatment can be verified. The analysis showed in the procedure 1 the formation of a mixture of phases, CPP and ß-TCP, while in the procedure 2, it was obtained HA and ß-TCP. In all coating, using the thermal procedure 2, it was gotten to transform the bioinert surface of the titanium for a bioactive constituted of ceramic of calcium phosphate of biological interest. Therefore, that procedure presented satisfactory for the obtaining of bioactives coatings of calcium phosphate for be used in dental and orthopedical implants.
The c.p. Ti surface was modified by Laser Nd:YAG and compounds bioactives coating by sol-gel method, seeking clinical applications. The samples of c.p. Ti were irradiated byLaser Nd:YAG pulsed in air and atmospheric pressure, establishing four study conditions. The coatings, on the irradiated surfaces, were carried through by the sol- gel method, where the sol was prepared starting from the precursors Ca(NO3)2.4H2O and H3PO4. The coatings were deposited by dip-coating and treated termically by two procedures with heating ramps different (P1 and P2), and final temperature was 700° C. The characterizations of the samples were carried through by SEM, XRD and FT-IR. Results of the modification by laser beam showed that the four established conditions suggested have enough energy to promote the ablation in the irradiated surface. It was verified that there was not presence of any phase regarding nitretes of titanium and that it is possible to obtain TiO, Ti3O and Ti6O with different percentages, depending on the fluency used. Also, it is verified that the modification for Laser is a clean process, not leaving tracks of contamination, important characteristic for clinical applications. For the results of the bioactives coatings , the influence of thermal treatment can be verified. The analysis showed in the procedure 1 the formation of a mixture of phases, CPP and ß-TCP, while in the procedure 2, it was obtained HA and ß-TCP. In all coating, using the thermal procedure 2, it was gotten to transform the bioinert surface of the titanium for a bioactive constituted of ceramic of calcium phosphate of biological interest. Therefore, that procedure presented satisfactory for the obtaining of bioactives coatings of calcium phosphate for be used in dental and orthopedical implants.
Descrição
Palavras-chave
Materiais biomédicos, Sol-gel, Laser, Titanio, Pesquisas odontológicas, Biomaterials
Como citar
BINI, Rafael Admar. Recobrimentos cerâmicos bioativos pelo processo sol-gel sobre Ti c.p. modificado por laser empregados em implantes. 2007. 107 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Química, 2007.