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Original Article

Initial stress induced in tooth and alveolar bone after the application of forces for orthodontic torque movement when bone support is diminished: analysis by the finite element method

1999, Volumen 29, Número 1
Félix de Carlos, M.ª Pilar Fernández Mondragón, Martín Puente Rodríguez, David Suárez Quintanilla, Juan Cobo
Profesor asociado de Ortodoncia. Universidad de Oviedo. Oviedo

The effect that a reduction of alveolar height has on stress in the tooth and the alveolar bone induced by a labio-radicular torque on an inferior canine has been analized using the Finite Element Method (FEM). The torque was produced by a couple of 50 g mm applied in the centre of the labial side of the crown; then the stress in the tooth and the alveolar bone were calculated on a three-dimensional model. Successive computations were performed after reducing the heigth of the alveolar bone by 2, 4, 6 and 8 mm. With 4 mm of loss, an important compression zone arises on the labial side of the alveolar bone in the apical region of the model. The same behavior was seen after 6 or 8 mm of bone loss. From this results we conclude that the possibility of undesirable effects of an orthodontic treatment increases considerably in patients who have suffered periodontal disease with loss of bone support.  (Rev Esp Ortod. 1999;29(1):027-031)

Key words:
Torque. Finite element method. Bone loss.
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