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Previous issue date: 2016-08-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / Bone injuries are a common form of trauma, being reported about 15 million fractures each year worldwide. Some of these lesions require the use of grafts to achieve bone regeneration. Currently, the main method used for treatment of these lesions is the use of autologous grafts. Although this technique is considered the gold standard of bone regeneration, there are some disadvantages such as the need for surgery to collect material and the lack of it. The application of composite biodegradable polymers such as poly (lactic-co-glycolic acid), calcium phosphates and bioactive ceramics such as apatite and bioglasses, represent an alternative in treatment of bone lesions. This is due to the possibility of combining characteristics of both materials. The objective of this research is to produce porous matrices PLGA:apatite/bioglass via two methodologies: salt leaching and lyophilization. The loads used in this study were synthesized by coprecipitation and evaluated by XRD, FTIR, SEM and DLS. The obtained porous structures are characterized by SEM, mercury porosimetry, compression, microtomography, in vitro degradation and in vitro biocompatibility. Highly porous composite scaffolds were obtained by the two methods studied. The load concentration and the type of load added to the polymeric matrix altered the mechanical properties and generated different surface features. Furthermore, the degradation rate of the supports is highly influenced by the added inorganic filler. / Danos ao tecido ?sseo s?o formas comuns de les?es, sendo reportadas cerca de 15 milh?es de fraturas a cada ano, em escala mundial. Parte destas les?es exige a utiliza??o de enxertos para regenera??o ?ssea. Atualmente, a principal metodologia utilizada para tratamento destas les?es ? a utiliza??o de enxertos aut?logos. Esta t?cnica ? considerada o padr?o ouro da regenera??o ?ssea, por?m, existem algumas desvantagens como a necessidade de uma cirurgia para coleta de material. A aplica??o de comp?sitos de pol?meros biodegrad?veis, como o ?cido poli (l?tico-co-glic?lico), fosfatos de c?lcio e cer?micas bioativas, como as apatitas e os biovidros, representa uma alternativa no tratamento de defici?ncias ?sseas. O objetivo desta pesquisa ? produzir matrizes porosas de PLGA: apatita/biovidro atrav?s de duas metodologias: lixivia??o de sal e liofiliza??o. As cargas utilizadas neste trabalho foram sintetizadas atrav?s de coprecipta??o e metodologia sol-gel e ent?o avaliadas por DRX, FTIR, MEV e DLS. As estruturas porosas obtidas foram caracterizadas por MEV, porosimetria a merc?rio, compress?o, microtomografia, degrada??o in vitro e biocompatibilidade in vitro. Foram obtidos arcabou?os comp?sitos altamente porosos atrav?s das duas metodologias estudadas. A concentra??o de carga e o tipo de carga adicionada a matriz polim?rica alteram as propriedades mec?nicas e diferentes caracter?sticas de superf?cie. Al?m disso, a velocidade de degrada??o dos arcabou?os ? altamente influenciada pela carga inorg?nica adicionada.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/6999 |
| Date | 29 August 2016 |
| Creators | Schardosim, Mariane Giacomini |
| Contributors | H?bler, Roberto |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Engenharia e Tecnologia de Materiais, PUCRS, Brasil, Faculdade de Engenharia |
| 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:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -7432719344215120122, 600, 600, 600, 600, -655770572761439785, 4518971056484826825, 2075167498588264571 |
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