Journal Article

Mandibular skeletal growth and modelling between 10 and 15 years of age

Peter H. Buschang and Luiz G. Gandini

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 24, issue 1, pages 69-79
Published in print February 2002 | ISSN: 0141-5387
Published online February 2002 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/24.1.69
Mandibular skeletal growth and modelling between 10 and 15 years of age

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This study pertains to a random sample of untreated French‐Canadian adolescents (79 females and 107 males) evaluated at 10 and again at 15 years of age. Superimpositions on natural reference structures were performed to describe condylar growth and modelling of 11 mandibular landmarks. Superimpositions on natural cranial/cranial base reference structures were performed to describe mandibular displacement and true rotation.

The results showed significant superior and posterior growth/modelling of the condyle and ramus. Males underwent significantly (P < 0.01) greater condylar growth and ramus modelling than females. With the exception of point B, which showed significant superior drift, modelling changes for the corpus landmarks were small and variable. The mandible rotated forward 2–3.3 degrees and was displaced 9.6–12.7 mm inferiorly and 1.9–2.7 mm anteriorly. Individual differences in ramus growth and modelling, both amount and direction, can be explained by mandibular rotation and displacements. Multivariate assessments revealed that superior condylar growth and ramus modelling were most closely associated with forward rotation and inferior mandibular displacement. Posterior growth and modelling were most closely correlated with anterior mandibular displacement and forward rotation. Modelling of the lower anterior border was independent of rotation and displacement.

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Subjects: Restorative Dentistry and Orthodontics

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