Através da meniscectomia no lado esquerdo, seguida ou não de enxerto, objetiva-se verificar as possíveis alterações nas superfícies articulares da ATM. Os animais formaram os grupos: GI (meniscectomia); GII (meniscectomia e enxerto); GIII (somente o acesso cirúrgico) que originaram subgrupos conforme o período pós-operatório (10 e 30 dias) e lado (direito e esquerdo). Nos animais GIII, GId, GIId, a Cm e a superfície articular da fossa mandibular (Fm) estavam organizadas em camadas com o predomínio de fibras colágenas do tipo I. Alterações morfológicas como erosão da Cm e Fm e amplos cistos subcondrais no osso subjacente foram verificadas nos animais GIe e GIIe. Em GIIe, a Cm apresentou um nível razoável de organização sob o enxerto. Fibras colágenas do tipo I constituíam as camadas articular e condroblástica nos animais GIe e GIIe e fibras do tipo III predominaram na camada pré-condroblástica. Amplos espaços vasculares eram evidentes na zona bilaminar dos animais GI e GII. / The morphological features of the temporomandibular joint (TMJ) of rats were studied after meniscectomy in the left side of the joint. The specimens were submitted or not to an interpositional auricular cartilage graft. The animals formed the following groups: GI (meniscectomy); GII (meniscectomy and graft); GIII (sham). The post-operative periods (10, 30 days) and the side allowed to form the subgroups. The articular surface of the TMJ exhibited organized layers (GIII, GId, GIId groups) where the type I collagen fibers arranged in regular nets prevailed. Morphological changes as erosion of the articular surface with large subchondral cysts in the subjacent bone were verified (GIe, GIIe). The condyle\'s surface of GII was regular and structurally preserved under the graft. The type I collagen fibers constituted the articular and chondroblastic layers in the GIe and GIIe animals where the type III collagen fibers were predominant in the prechondroblastic layer. Wide vascular spaces were evident in the bilaminar zone of the GI and GII animals.

Através da meniscectomia no lado esquerdo, seguida ou não de enxerto, objetiva-se verificar as possíveis alterações nas superfícies articulares da ATM. Os animais formaram os grupos: GI (meniscectomia); GII (meniscectomia e enxerto); GIII (somente o acesso cirúrgico) que originaram subgrupos conforme o período pós-operatório (10 e 30 dias) e lado (direito e esquerdo). Nos animais GIII, GId, GIId, a Cm e a superfície articular da fossa mandibular (Fm) estavam organizadas em camadas com o predomínio de fibras colágenas do tipo I. Alterações morfológicas como erosão da Cm e Fm e amplos cistos subcondrais no osso subjacente foram verificadas nos animais GIe e GIIe. Em GIIe, a Cm apresentou um nível razoável de organização sob o enxerto. Fibras colágenas do tipo I constituíam as camadas articular e condroblástica nos animais GIe e GIIe e fibras do tipo III predominaram na camada pré-condroblástica. Amplos espaços vasculares eram evidentes na zona bilaminar dos animais GI e GII. / The morphological features of the temporomandibular joint (TMJ) of rats were studied after meniscectomy in the left side of the joint. The specimens were submitted or not to an interpositional auricular cartilage graft. The animals formed the following groups: GI (meniscectomy); GII (meniscectomy and graft); GIII (sham). The post-operative periods (10, 30 days) and the side allowed to form the subgroups. The articular surface of the TMJ exhibited organized layers (GIII, GId, GIId groups) where the type I collagen fibers arranged in regular nets prevailed. Morphological changes as erosion of the articular surface with large subchondral cysts in the subjacent bone were verified (GIe, GIIe). The condyle\'s surface of GII was regular and structurally preserved under the graft. The type I collagen fibers constituted the articular and chondroblastic layers in the GIe and GIIe animals where the type III collagen fibers were predominant in the prechondroblastic layer. Wide vascular spaces were evident in the bilaminar zone of the GI and GII animals.

O objetivo deste trabalho foi investigar a influência do enxerto ósseo autógeno particulado no processo de reparo do alvéolo dental de ratos Wistar após exodontia. Os animais foram divididos em grupos controle e experimental. Os ratos controles foram submetidos à intervenção cirúrgica para exodontia do incisivo superior direito apenas, enquanto nos ratos experimentais foram realizadas a exodontia e enxertia óssea no alvéolo dental. A eutanásia dos ratos foi realizada no 5o, 15o, 21o e 28o dias de pós-operatório. As amostras obtidas foram processadas para análise histológica. A densidade de área ocupada por osso foi quantificada por um método de contagem diferencial de pontos e com auxílio de um programa de imagens. Os resultados mostraram que a densidade de área preenchida por tecido ósseo não apresentou diferenças estatísticas em nenhum dos tempos pós-operatórios nos grupos analisados. Concluiu-se que o enxerto ósseo autógeno não promoveu um aumento significativo da neoformação óssea no alvéolo dental após exodontia. / After tooth extraction a continuous bone resorption of the alveolar process is observed in the maxilla and in the mandible. The unfavorable anatomy of the reabsorbed bone ridge limits the rehabilitation of the edentulous area with prostheses over dental implants. Filling the dental alveolus after the exodontia with bone grafts and/or biomaterials is a procedure that tries to delay the physiologic resorption of the alveolar process and stimulates bone formation. The aim of this study is to investigate the influence of the particulated autogenous bone graft in the alveolar socket healing following tooth extraction in Rattus Norvegicus Albinus lineage Wistar. Sixty-seven male rats were used, each weighing 190 to 250 g. The animals were divided in a control and an experimental group. The upper right incisor was extracted in the rats of both groups. Following the tooth extraction, in the animals of the experimental group, the socket was grafted with particulated autogenous bone. The bone graft was obtained from the iliac bone of the same grafted animal. At 7, 14 and 21 days of postoperative, some rats received subcutaneous applications of the ossification marker calcein dissolved in a sodium bicarbonate 2% solution. The euthanasia of the animals was accomplished in the 5th, 15th, 21st and 28th days of postoperative. After the euthanasia the bone parts that contain the dental socket of each right maxilla were removed and reduced to small samples. All the samples were then fixed and processed for histological analysis. The total area of bone was quantified in the socket by a differential point-counting method and by use of an image analyzing program. The data were analyzed statistically and showed that there was a progressive increase of the bone total area during the postoperative periods. However, the morphometric analysis of the total area of bone in the control and experimental groups, did not show a significant statistical difference in none of the postoperative periods. The results reveal that the autogenous bone graft did not promote a significant increase of the bone new formation in the dental socket following tooth extraction.

O objetivo deste trabalho foi investigar a influência do enxerto ósseo autógeno particulado no processo de reparo do alvéolo dental de ratos Wistar após exodontia. Os animais foram divididos em grupos controle e experimental. Os ratos controles foram submetidos à intervenção cirúrgica para exodontia do incisivo superior direito apenas, enquanto nos ratos experimentais foram realizadas a exodontia e enxertia óssea no alvéolo dental. A eutanásia dos ratos foi realizada no 5o, 15o, 21o e 28o dias de pós-operatório. As amostras obtidas foram processadas para análise histológica. A densidade de área ocupada por osso foi quantificada por um método de contagem diferencial de pontos e com auxílio de um programa de imagens. Os resultados mostraram que a densidade de área preenchida por tecido ósseo não apresentou diferenças estatísticas em nenhum dos tempos pós-operatórios nos grupos analisados. Concluiu-se que o enxerto ósseo autógeno não promoveu um aumento significativo da neoformação óssea no alvéolo dental após exodontia. / After tooth extraction a continuous bone resorption of the alveolar process is observed in the maxilla and in the mandible. The unfavorable anatomy of the reabsorbed bone ridge limits the rehabilitation of the edentulous area with prostheses over dental implants. Filling the dental alveolus after the exodontia with bone grafts and/or biomaterials is a procedure that tries to delay the physiologic resorption of the alveolar process and stimulates bone formation. The aim of this study is to investigate the influence of the particulated autogenous bone graft in the alveolar socket healing following tooth extraction in Rattus Norvegicus Albinus lineage Wistar. Sixty-seven male rats were used, each weighing 190 to 250 g. The animals were divided in a control and an experimental group. The upper right incisor was extracted in the rats of both groups. Following the tooth extraction, in the animals of the experimental group, the socket was grafted with particulated autogenous bone. The bone graft was obtained from the iliac bone of the same grafted animal. At 7, 14 and 21 days of postoperative, some rats received subcutaneous applications of the ossification marker calcein dissolved in a sodium bicarbonate 2% solution. The euthanasia of the animals was accomplished in the 5th, 15th, 21st and 28th days of postoperative. After the euthanasia the bone parts that contain the dental socket of each right maxilla were removed and reduced to small samples. All the samples were then fixed and processed for histological analysis. The total area of bone was quantified in the socket by a differential point-counting method and by use of an image analyzing program. The data were analyzed statistically and showed that there was a progressive increase of the bone total area during the postoperative periods. However, the morphometric analysis of the total area of bone in the control and experimental groups, did not show a significant statistical difference in none of the postoperative periods. The results reveal that the autogenous bone graft did not promote a significant increase of the bone new formation in the dental socket following tooth extraction.