Análise do processo de reparo de defeitos ósseos críticos em calvária de ratos preenchidos com osso autógeno ou Bone Ceramic: um estudo histométrico e imunoistoquímico
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2014-02-11
Autores
Fabris, André Luis da Silva [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
(1) Objetivos: Avaliar por meio da análise histométrica e imunoistoquímica, o potencial osteocondutor de grânulos de hidroxiapatita e beta- tricálcio fosfato (Bone Ceramic - Straumann®) no processo de reparo de defeitos ósseos críticos em calvária de ratos. (2) Métodos: Foram utilizados ratos divididos em três grupos (n=8), submetidos à eutanásia aos 14 dias e 28 dias pós-cirúrgicos. Em cada animal foi realizado um defeito ósseo de 5mm na calvária, sendo o Grupo Coágulo (GC) com o defeito preenchido somente com coágulo; Grupo Osso Autógeno (GA), preenchido com osso autógeno e Grupo Bone Ceramic (GBC), com osso aloplástico (Straumann®). Foi avaliada a área de tecido ósseo presente na região central dos defeitos ósseos. Para a comparação entre os valores obtidos, foi realizado o teste ANOVA e como pós-teste, Tukey. Foi adotado como nível de significância p<0,05. Foi realizada análise imunoistoquímica, com os anticorpos primários contra OC, RUNX 2, TRAP e VEGF, para a avaliação dos diferentes estágios do processo de reparo ósseo. Como análise adicional, foram obtidads imagens 3D das cálvarias em microtomografia. (3) Resultados: O local do defeito ósseo originalmente tratado com BC foi totalmente preenchido por um conglomerado de biomateriais e osso neoformado, o qual foi estatisticamente superior ao GC, em ambos os períodos analisados (p<0,05). Remanescentes de BC eram visíveis e estavam em íntimo contato com o tecido ósseo. Além disso, no grupo GA as observações foram semelhantes, porém foi notado fechamento total do defeito aos 28 dias e houve maior área de neoformação óssea em todos os períodos analisados, comparando-se aos demais biomateriais (p<0,05). Defeitos que foram preenchidos com CO apresentaram apenas um tecido conjuntivo delgado fechando o defeito...
(1)Objectives: To evaluate by histometric and immunohistochemical analysis, the osteoconductive potential of hydroxyapatite granules and beta-tricalcium phosphate (Bone Ceramic - Straumann ®) in the repair of critical bone defects in rat calvaria process. (2)Methods: The rats were divided into three groups (n = 8) and submitted to euthanasia at 14 days and 28 days post-surgery. In each animal a 5 mm calvaria bone defect was performed. In Blood Clot Group (CG) the defect was filled only with clot; in the Autogenous Bone Group (AG) the defect was filled with autogenous bone and in Bone Ceramic Group (BC), with alloplastic bone (Straumann ®).The bone tissue area was evaluated in the central region of bone defects. The results were submitted to ANOVA and Tukey’s test at 5% level of significance. For the evaluation of the different stages of the bone healing process, immunohistochemical analysis was performed with primary antibodies against OC, RUNX 2, TRAP and VEGF. As an additional analysis, calvaria’s 3D images were obtained in microtomography. (3)Results: The bone defect treated with BC was filled with a conglomerate of biomaterials and bone formation, which was statistically higher than CG in both periods analyzed. Remnants of BC were visible and were in intimate contact with bone tissue. Furthermore, the AG group observations were similar, but it was observed a complete defect closure after 28 days and there was a greater area of bone formation in all periods analyzed, comparing to other biomaterials (p <0.05). The defects filled with CO showed only a slender conjunctive tissue closing the bone defect. The TRAP protein was lightly immunomarked, while immunostaining of VEGF was moderate. The osteocalcin immunostaining was present in all analyzed periods (14 and 28 days). The AG group´s 3D image showed full compatibility bone...
(1)Objectives: To evaluate by histometric and immunohistochemical analysis, the osteoconductive potential of hydroxyapatite granules and beta-tricalcium phosphate (Bone Ceramic - Straumann ®) in the repair of critical bone defects in rat calvaria process. (2)Methods: The rats were divided into three groups (n = 8) and submitted to euthanasia at 14 days and 28 days post-surgery. In each animal a 5 mm calvaria bone defect was performed. In Blood Clot Group (CG) the defect was filled only with clot; in the Autogenous Bone Group (AG) the defect was filled with autogenous bone and in Bone Ceramic Group (BC), with alloplastic bone (Straumann ®).The bone tissue area was evaluated in the central region of bone defects. The results were submitted to ANOVA and Tukey’s test at 5% level of significance. For the evaluation of the different stages of the bone healing process, immunohistochemical analysis was performed with primary antibodies against OC, RUNX 2, TRAP and VEGF. As an additional analysis, calvaria’s 3D images were obtained in microtomography. (3)Results: The bone defect treated with BC was filled with a conglomerate of biomaterials and bone formation, which was statistically higher than CG in both periods analyzed. Remnants of BC were visible and were in intimate contact with bone tissue. Furthermore, the AG group observations were similar, but it was observed a complete defect closure after 28 days and there was a greater area of bone formation in all periods analyzed, comparing to other biomaterials (p <0.05). The defects filled with CO showed only a slender conjunctive tissue closing the bone defect. The TRAP protein was lightly immunomarked, while immunostaining of VEGF was moderate. The osteocalcin immunostaining was present in all analyzed periods (14 and 28 days). The AG group´s 3D image showed full compatibility bone...
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Palavras-chave
Materiais biomédicos, Regeneração óssea, Imuno-histoquímica, Biomedical materials
Como citar
FABRIS, André Luis da Silva. Análise do processo de reparo de defeitos ósseos críticos em calvária de ratos preenchidos com osso autógeno ou Bone Ceramic: um estudo histométrico e imunoistoquímico. 2014. 74 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Odontologia de Araçatuba, 2014.