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PubMed1995

[Structural changes in the periodontal tissues under measured exposure to intra- and extraoral orthodontic appliances in the unstable bite].

Study of the histological characteristics of the teeth, dental rudiments, and periodontal tissues of animals during distraction of the maxilla and distal dislocation of the mandible by "minor", "medium", and "strong" force showed that the type and degree of morphological changes are related to the strength of exposure and duration of orthodontist device application. The minor (1.2 H) and medium (2.5 H) force did not injure the studied structural elements of the periodical complex. Exposure of osseous tissues to a strong (5.0 H) force surpassing the compensatory potential of this tissue caused a complex of changes characterized by predominance of the processes of destruction of bone matter, specifically, by its resorption over its regeneration. These processes were the most evident during distal dislocation of the mandible. Appreciable foci of resorption were observed not only in the alveolar process bone, but in hard tissues (dentin and cement) of deciduous teeth as well. These results demonstrate the necessity of a careful approach to the choice of the intensity of force developed by various orthodontist devices.

Animals↗