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Master's Dissertation
DOI
10.11606/D.25.2011.tde-12072011-085338
Document
Author
Full name
Bruno Cavalini Cavenago
Institute/School/College
Knowledge Area
Date of Defense
Published
Bauru, 2011
Supervisor
Committee
Garcia, Roberto Brandao (President)
Bramante, Clovis Monteiro
Dezan Junior, Eloi
Title in Portuguese
Estudo do processo de reparo ósseo em função de quatro biomateriais. Avaliação histomorfológica em tíbia de coelhos
Keywords in Portuguese
Materiais biocompatíveis
Regeneração óssea
Teste de materiais
Abstract in Portuguese
Este estudo avaliou o processo de reparo ósseo em cavidades cirúrgicas de tamanho não crítico, quando preenchidas por diferentes biomateriais. Um defeito ósseo de 5 mm de diâmetro por 8mm profundidade foi criado em cada metáfise tibial de 27 coelhos machos. Foram estabelecidos 4 grupos com 12 cavidades por material. As cavidades foram preenchidas com matriz óssea bovina inorgânica, GenOx Inorg® (grupo 1), matriz óssea bovina orgânica, GenOx Org® (grupo 2), matriz óssea bovina composta, GenMix® (grupo 3) e sulfato de cálcio di-hidratado (Grupo 4). Adicionalmente, seis cavidades preenchidas com coágulo sanguíneo foram utilizadas como controle (grupo 5). Os animais foram mortos após 30, 60 e 90 dias e as amostras coletadas foram submetidas ao processamento histotécnico para obter cortes de 5 m de espessura, corados com hematoxilina e eosina. Foram realizadas análises histomorfológica descritiva e histomofométrica, que consistiu na mensuração da área de tecido ósseo neoformado. Os dados obtidos foram submetidos ao teste estatístico de Kruskal-Wallis e Dunn. Aos 30 e 60 dias a área de tecido ósseo neoformado ocorreu de forma semelhante entre todos os grupos (P > 0,05). No período de 90 dias houve diferença significativa entre os grupos 2 e 4, bem como entre os grupos 4 e 5. Ao realizar a análise estatística de cada grupo em função dos 3 períodos experimentais, constatou-se que nos grupos 1, 2 e 3 a área de tecido ósseo neoformado aos 30 dias foi menor (P < 0,05) em relação a 60 e 90 dias. No grupo 4, ocorreu diferença significativa entre os períodos de 30 e 90 dias, já no grupo 5 houve diferença significante ao comparar 30 e 60 dias. Com base na microscopia observamos que os biomateriais estudados não inibiram o processo de reparo; o GenOx Inorg e a matriz inorgânica presente no GenMix exibiram características morfológicas de propriedade osteocondutora, mais intensa no primeiro grupo. O GenOx Org e o sulfato de cálcio di-hidratado apresentaram-se completamente reabsorvidos aos 30 dias. Foi possível concluir que os valores neoformativos proporcionados pelo GenMix não foram significativamente superiores, àqueles obtidos pelo GenOx Inorg, GenOx Org e sulfato de cálcio di-hidratado. Os diferentes biomateriais utilizados não apresentaram resultados superiores ao coágulo sanguíneo, exceto o sulfato de cálcio di-hidratado aos 90 dias.
Title in English
Study of bone repair process in function of four biomaterials. Microscopy evaluation in rabbit tibias
Keywords in English
Biocompatible materials
Bone regeneration
Materials testing
Abstract in English
This study evaluated the bone healing process in non-critical surgical cavity size, when grafted with different biomaterials. A 5mm wide and 8mm long defect were created in each tibial metaphysis of 27 male rabbits. Four groups of 12 cavities per material were established. The cavities were filled with deproteinized bovine bone, GenOx Inorg ® (group 1), demineralized bovine bone, GenOx Org® (group 2), composite bovine bone, GenMix® (group 3) and di-hydrate calcium sulfate (group 4). Additionally 6 cavities were filled with blood clot for control purposes (group 5). At 30, 60 and 90 days after surgery the animals were killed and the grafted areas were submitted to histologically process to obtain a 5 m thickness sections and stained with hematoxylin and eosin. The specimens were proceeded to descriptive and quantitative microscopic analysis, by measuring the area of new formed bone. The results were statistically analyzed by the Kruskal-Wallis and Dunn tests. At 30 and 60 days the area of new bone formation was similar among all groups (P > 0,05). In 90 days period there was a significant difference between groups 2 and 4, as well as groups 4 and 5. Performing the statistical analysis of each group in relation to the 3 experimental periods, it was found that in groups 1, 2 and 3 the area of new bone formed at 30 days was lower (P < 0,05) than 60 and 90 days. There was a significant difference in group 4 comparing the periods 30 and 90 days and in group 5 between 30 and 60 days. Based on microscopy findings we observed that the biomaterials studied did not inhibit the repair process; the GenOx Inorg and inorganic matrix present in GenMix exhibited morphological characteristics of osteoconductive property, more intense in the first one. The GenOx Org and di-hydrate calcium sulfate were completely reabsorbed within 30 days. It was concluded that the values of new bone formed area provided by GenMix were not significantly higher than obtained by GenOx Inorg, GenOx Org and di-hydrate calcium sulfate. The different biomaterials used did not show better results than blood clot, except di-hydrate calcium sulfate at 90 days.
 
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Publishing Date
2011-07-12
 
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