Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional Revisado por pares

BIBTEX RIS

Altered mandibular growth under functional posterior displacement in rats

2011; E.H Angle Education and Research Foundation; Volume: 82; Issue: 1 Linguagem: Inglês

10.2319/040411-241.1

1945-7103

Arcelino Farias‐Neto, Ana Paula Varela Brown Martins, Sidney R. Figueroba, Francisco Carlos Groppo, Solange María de Almeida, Célia Marisa Rizzatti‐Barbosa,

Craniofacial Disorders and Treatments

Abstract Objective: To test the null hypothesis that there is no difference in mandibular growth between growing rats with posterior functional mandibular displacement and growing rats without functional mandibular displacement. Materials and Methods: Twenty female Wistar rats (5 weeks old) were randomized into two groups: (1) control and (2) mandible posterior displacement in the occluded condition induced by an occlusal guiding appliance. After 8 weeks all animals were sacrificed, cone beam computed tomography scan images of the heads were taken using the classic I-CAT, and acrylic rapid-prototyped templates of the mandibles were constructed. Mandibular length, ramus height, and intercondylar distance were measured. Mandibular length and ramus height were submitted to the two-way analysis of variance, while intercondylar distance was analyzed by nonpaired Student's t-test. Results: Mandibular length was bigger (P < .0001) in the control than in the experimental group, but no significant difference was found between the left and right sides (P = .9380). No significant differences were observed for ramus height and intercondylar distance. Conclusions: The results of this study demonstrated that functional posterior displacement of the mandible in growing rats resulted in shorter mandibular length.