Journal Article

Age-related changes in sagittal relationship between the maxilla and mandible

Christopher J. Lux, Donald Burden, Christian Conradt and Gerda Komposch

in The European Journal of Orthodontics

Published on behalf of European Orthodontics Society

Volume 27, issue 6, pages 568-578
Published in print December 2005 | ISSN: 0141-5387
Published online August 2005 | e-ISSN: 1460-2210 | DOI: http://dx.doi.org/10.1093/ejo/cji061
Age-related changes in sagittal relationship between the maxilla and mandible

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The aim of the study was to assess age-related changes in sagittal jaw relationship during pre-pubertal and pubertal development on the basis of angular [ANB, anteroposterior dysplasia indicator (APDI) and A–B plane angle] and linear (Wits, AF–BF, App–Bpp, and App–Pgpp) measurements. Lateral cephalograms of orthodontically untreated subjects were evaluated at 7, 9, 11, 13 and 15 years of age. Cephalometric standards and age-related changes were determined on the basis of Class I subjects with a good occlusion (n = 18, 10 males and 8 females).

With respect to changes related to growth, the main findings were, in both genders, a statistically significant age-related decrease in ANB angle, App–Bpp and App–Pgpp, a significant increase in APDI, but no age-related change in Wits. A reduction of sagittal jaw distance during pre-pubertal and pubertal development was observed arising from a relative dominance of sagittal mandibular growth.

For an evaluation of differences concerning jaw relationship in Class II subjects, a group with Class II division 1 malocclusions (n = 17) and a group with Class II division 2 malocclusions (n = 12 were compared with two control groups, i.e. the good occlusion group and a Class I group (n = 37). Conclusions about the sagittal discrepancy in Class II division 1 and Class II division 2 subjects depended on the geometric reference used in the various parameters, and further research is called for with respect to the diagnostic performance of the various measurements. Differences between Class II subjects and controls present at 15 years of age were already established at 7 years of age, but were less pronounced.

Journal Article.  4435 words.  Illustrated.

Subjects: Restorative Dentistry and Orthodontics

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