Effect of cyclical forces on the periodontal ligament and alveolar bone remodeling during orthodontic tooth movement.
Angle Orthod
; 84(2): 297-303, 2014 Mar.
Article
em En
| MEDLINE
| ID: mdl-23937517
ABSTRACT
OBJECTIVE:
To investigate the effect of externally applied cyclical (vibratory) forces on the rate of tooth movement, the structural integrity of the periodontal ligament, and alveolar bone remodeling.METHODS:
Twenty-six female Sprague-Dawley rats (7 weeks old) were divided into four groups CTRL (unloaded), VBO (molars receiving a vibratory stimulus only), TMO (molars receiving an orthodontic spring only), and TMO+VB (molars receiving an orthodontic spring and the additional vibratory stimulus). In TMO and TMO+VB groups, the rat first molars were moved mesially for 2 weeks using Nickel-Titanium coil spring delivering 25 g of force. In VBO and TMO+VB groups, cyclical forces at 0.4 N and 30 Hz were applied occlusally twice a week for 10 minutes. Microfocus X-ray computed tomography analysis and tooth movement measurements were performed on the dissected rat maxillae. Tartrate-resistant acid phosphatase staining and collagen fiber assessment were performed on histological sections.RESULTS:
Cyclical forces significantly inhibited the amount of tooth movement. Histological analysis showed marked disorganization of the collagen fibril structure of the periodontal ligament during tooth movement. Tooth movement caused a significant increase in osteoclast parameters on the compression side of alveolar bone and a significant decrease in bone volume fraction in the molar region compared to controls.CONCLUSIONS:
Tooth movement was significantly inhibited by application of cyclical forces.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ligamento Periodontal
/
Técnicas de Movimentação Dentária
/
Remodelação Óssea
/
Processo Alveolar
Limite:
Animals
Idioma:
En
Revista:
Angle Orthod
Ano de publicação:
2014
Tipo de documento:
Article