Análise microscópica dos fenômenos teciduais da movimentação dentária induzida em ratos no período de um a sete dias / Microscopic analysis of the tissue phenomenons of induced tooth movement in rats in period ranging from 1-7 days

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The induced tooth movement is a multiple biology process characterized by sequenced reactions of the periodontal tissue as an answer to the biomechanic forces. The induced tissue changes are related to its remodeling through the activation of the alveolar bone reabsorption in the side where the pression occurs and a consequently bone apposition in the tension side. The created stimulae due to mechanical stress during the induced tooth movement measured the tissue changes. This, together with the chemical mediators result in a new periodontal homeostatic condition, such as hyalinization, remodelling and reabsorption. Aiming to establish an ideal time to observe the alterations since the beginning of the experimental induced tooth movement, a daily morphological tissue profile was designed since the beginning steps in rats using as a control the teeth in the opposite side which were not moved. It was considered: the aspects of normality (in the control side) and the microscopics phenomena observed during the induced tooth movement since the beginnig steps detailing them; the extension and intensity of the bone and tooth resorption. The sample was made up in twenty-one male Wistar rats which underwent a induced tooth movement for a period raging between 1 to 7 days using the closed coil spring (HELLER; NANDA model). Based in the observation and considering the morphology, it was concluded that: the celular and tissue morphologic changes in the periodontal tension side from the teeth under mechanical stress did not suffer from a great variation anging the groups for the experimental model; the morphologic changes in the pressure and tension sides were gradually intensified as the length of the experimental time passed by, nevertheless without occourring a tooth resorption; the ideal time of induced tooth movement in this kind of rats is within a period where there is a balance between the applied force and the not destroyed and irreversibly morphologic changes gotten. Here, the fifth day after force was applied.

ASSUNTO(S)

tecido periapical movimentação dentária ratos

ACESSO AO ARTIGO

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