Avaliação histológica e imuno-histoquímica do subcutâneo e do alvéolo dentário de ratos com implantes de cimento Portland, MTA e MTA experimental
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Data
2010-03-30
Autores
Viola, Naiana Viana [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Atualmente, dentre os materiais retrobturadores, destaca-se o Mineral Trióxido Agregado (MTA) e seus derivados. Devidos as suas boas propriedades biológicas e a necessidade de um cimento endodôntico mais próximo do ideal, modificações têm sido propostas ao MTA na tentativa de se obter um material obturador de canal radicular. Assim, o objetivo do presente estudo foi avaliar a resposta biológica dos materias Portland, MTA e um material experimental à base de MTA (CE-MTA), no tecido subcutâneo e alvéolo dentário de ratos. Foram utilizados 80 ratos, divididos em 4 grupos: 1-Cimento Portland (CP); 2-MTA (Angelus); 3- CE-MTA e 4-Controle (tubo de polietileno vazio). Em cada animal, foram implantados dois tubos de polietileno, preenchidos ou não com material, no alvéolo dentário e no subcutâneo da região dorsal. Decorrido os períodos de 7, 14, 30 e 60 dias, os implantes juntamente com os tecidos adjacentes foram removidos, fixados e processados para inclusão em parafina. Os cortes do subcutâneo e do alvélo dentário contendo os implantes corados com H&E, foram utilizados para análise morfológica e quantificação de células inflamatórias; alguns cortes foram submetidos a imuno-histoquímica para detecção de osteopontina (OPN) e osteocalcina (OCN) presentes durante a formação dos tecidos mineralizados. Cortes do subcutâneo contendo os implantes foram submetidos ao método de Von Kossa, usado para identificar estruturas calcificadas. Os resultados mostraram que aos 7 dias todos os materiais promoveram uma moderada reação inflamatória no subcutâneo; aos 14 dias, verificou-se um aumento, embora não estatisticamente significante, no número de células inflamatórias no grupo CE-MTA em comparação aos demais grupos. No entanto, o número de células inflamatórias reduziu significantemente nos períodos de 30 e 60 dias, em todos os grupos...
Currently, among the filling materials, the Mineral trioxide aggregate (MTA) and its derivatives stands. Due to its good biological properties and the need for a sealer closest to the ideal, changes have been proposed to the MTA in an attempt to get a filling material for root canal. The purpose of this study was to evaluate the biological response of the materials Portland, MTA and MTA-based experimental cement in subcutaneous tissue and tooth socket of rats. Were used 80 rats divided into 4 groups: 1-Portland cement (PC), 2-MTA (Angelus), 3 – CEMTA and 4-Control (polyethylene tubes empty). In each animal, polyethylene tubes were implanted into dorsal subcutaneous and in the tooth socket. After 7, 14, 30 and 60 days, fragments of the subcutaneous and of the maxilla containing the implants with surrounding tissues were removed, fixed, processed and embedded in paraffin. H&E-stained sections of the subcutaneous and tooth socket with the polyethylene tubes were used for morphological analysis and quantification of inflammatory cells, some sections were submitted to immunohistochemistry for detection of osteopontin (OPN) and osteocalcin (OCN), typical non-collagen proteins of the mineralized tissues. von Kossa method, used to identify calcified structures, was performed in the subcutaneous sections. Our results showed that, in the period of 7 days, a moderate inflammatory reaction was observed in the all groups; at 14 days, although not statistically significant, the number of inflammatory cells in the CE-MTA group was higher than other groups. However, the number of inflammatory cells decreased significantly in the periods of 30 and 60 days in all groups in comparasion to initial periods. Moreover, significant differences were not found between the groups containing materials (PC, MTA and CE-MTA) and the control group indicating, therefore, that these materials are biocompatible... (Complete abstract click electronic access below)
Currently, among the filling materials, the Mineral trioxide aggregate (MTA) and its derivatives stands. Due to its good biological properties and the need for a sealer closest to the ideal, changes have been proposed to the MTA in an attempt to get a filling material for root canal. The purpose of this study was to evaluate the biological response of the materials Portland, MTA and MTA-based experimental cement in subcutaneous tissue and tooth socket of rats. Were used 80 rats divided into 4 groups: 1-Portland cement (PC), 2-MTA (Angelus), 3 – CEMTA and 4-Control (polyethylene tubes empty). In each animal, polyethylene tubes were implanted into dorsal subcutaneous and in the tooth socket. After 7, 14, 30 and 60 days, fragments of the subcutaneous and of the maxilla containing the implants with surrounding tissues were removed, fixed, processed and embedded in paraffin. H&E-stained sections of the subcutaneous and tooth socket with the polyethylene tubes were used for morphological analysis and quantification of inflammatory cells, some sections were submitted to immunohistochemistry for detection of osteopontin (OPN) and osteocalcin (OCN), typical non-collagen proteins of the mineralized tissues. von Kossa method, used to identify calcified structures, was performed in the subcutaneous sections. Our results showed that, in the period of 7 days, a moderate inflammatory reaction was observed in the all groups; at 14 days, although not statistically significant, the number of inflammatory cells in the CE-MTA group was higher than other groups. However, the number of inflammatory cells decreased significantly in the periods of 30 and 60 days in all groups in comparasion to initial periods. Moreover, significant differences were not found between the groups containing materials (PC, MTA and CE-MTA) and the control group indicating, therefore, that these materials are biocompatible... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Imuno-histoquímica, Rato, Endodontia, Teste de materiais, Immunohistochemistry, Endodontics, Materials testing, Rats
Como citar
VIOLA, Naiana Viana. Avaliação histológica e imuno-histoquímica do subcutâneo e do alvéolo dentário de ratos com implantes de cimento Portland, MTA e MTA experimental. 2010. 134 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araraquara, 2010.