Histomorfometria do periodonto em estado diabético inicial após movimentação dentária experimental em ratos
Arquivos
Data
2007-12-10
Autores
An, Tien Li [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Este estudo avaliou histomorfometricamente o periodonto após a movimentação dentária experimental em ratos sob estado diabético inicial. Numa amostra de 40 ratos, 20 normais e 20 diabéticos induzidos por estreptozotocina, utilizou-se o lado esquerdo como lado experimental, movimentando o primeiro molar superior com uma mola fechada de 25 cN, enquanto que o lado direito, sem acessório, serviu como controle. Realizou-se a eutanásia dos animais, respectivamente, 3, 7, 14 e 21 dias após movimentação para proceder preparo histológico convencional e análises microscópicas quantitativas e qualitativas. Macroscopicamente, exceto no terceiro dia, os ratos diabéticos demonstraram menores magnitudes de movimentação dentária. Microscopicamente, houve diferenças significantes quando as áreas do espaço periodontal dos ratos normais (p<0,01) e diabéticos (p<0,05) foram comparadas com seus respectivos controles nos quadrantes cervicais diastais, respectivamente, no 3º, 7º e 14º dia. Não se observou diferenças significantes entre os ratos normais e diabéticos exceto o quadrante apical distal (p<0,05) no 7o dia pós-movimentação. Qualitativamente, a neoformação do osso alveolar dos ratos diabéticos foi menor quando comparado com os normais. Apesar das diferenças qualitativas nas respostas teciduais do periodonto, a condição diabética em estado inicial mostrou pouco impacto clínico sobre o procedimento de movimentação dentária induzida.
This study performed histomorphometric analysis of the periodontium resulted from experimental tooth movement in short-term diabetic rats. Using a split mouth design, in a sample of 40 rats, 20 normal and 20 streptozotocin-induced diabetic rats, left side of upper jaw was used to induce first molar tooth movement with a 25 cN closed coil spring, and the right side without the appliance served as control. Animals were killed, respectively, at 3, 7, 14 and 21 days post-movement and hemi-maxillas were submitted to conventional histological procedures and microscopic quantitative and qualitative analysis. Macroscopically, except at the 3rd day, diabetic rats showed minor magnitude of tooth movement. Microscopically, significant differences were evidenced between the experimental and control side at the distocervical quadrant at day 3, 7 and 14 after experimental tooth movement for both normal rats (p<0.01) and diabetic rats (p<0.05). There was no difference between the areas of periodontal space of normal and diabetic group except the mesiocervical quadrant at day 7 (p<0.05). Qualitatively, minor magnitude of alveolar bone neoformation was shown in diabetic group when compared with control group. Despite the qualitative differences observed in the periodontal tissue responses, the short-term diabetic state demonstrated little clinical impact on the experimental tooth movement.
This study performed histomorphometric analysis of the periodontium resulted from experimental tooth movement in short-term diabetic rats. Using a split mouth design, in a sample of 40 rats, 20 normal and 20 streptozotocin-induced diabetic rats, left side of upper jaw was used to induce first molar tooth movement with a 25 cN closed coil spring, and the right side without the appliance served as control. Animals were killed, respectively, at 3, 7, 14 and 21 days post-movement and hemi-maxillas were submitted to conventional histological procedures and microscopic quantitative and qualitative analysis. Macroscopically, except at the 3rd day, diabetic rats showed minor magnitude of tooth movement. Microscopically, significant differences were evidenced between the experimental and control side at the distocervical quadrant at day 3, 7 and 14 after experimental tooth movement for both normal rats (p<0.01) and diabetic rats (p<0.05). There was no difference between the areas of periodontal space of normal and diabetic group except the mesiocervical quadrant at day 7 (p<0.05). Qualitatively, minor magnitude of alveolar bone neoformation was shown in diabetic group when compared with control group. Despite the qualitative differences observed in the periodontal tissue responses, the short-term diabetic state demonstrated little clinical impact on the experimental tooth movement.
Descrição
Palavras-chave
Diabetes, Diabetes mellitus, Movimentação dentária, Tooth movement
Como citar
AN, Tien Li. Histomorfometria do periodonto em estado diabético inicial após movimentação dentária experimental em ratos. 2007. 153 f. Tese (doutorado) - Universidade Estadual Paulista, Faculdade de Odontologia de Araçatuba, 2007.