Contribution
Changes of mandibular dental arch shape during adolescence and its influence on late mandibular incisor crowding
Zigante, Martina; Pavlic, Andrej; Radunovic, Vaska Vandevska; Mathewson, Alana; Knezevic, Ana Kotarac; Spalj, Stjepan
HOMO Volume 70 No 3 (2019), p. 185 - 192
publié: Nov 11, 2019
publication en ligne: Sep 5, 2019
manuscrit accepté: May 17, 2019
revision du manuscrit reçu: May 13, 2019
révision du manuscrit demandée: May 3, 2019
manuscrit reçu: Dec 4, 2017
ArtNo. ESP139007003001, Prix: 29.00 €
Abstract
The aim was to analyze the changes in mandibular dental arch shape during adolescence and assess its relation to late mandibular incisor crowding. Longitudinal study included 68 orthodontically untreated subjects (49% female) and analyzed their data for the ages of 12, 15, 18 and 21 years. Measurements included anterior arch depth, intercanine, interpremolar/anterior and intermolar/posterior width, Little’s Irregularity and Bolton’s index and the ratio between anterior arch depth and width. Males had significantly greater posterior widths than females at any age (p < 0.05). The anterior arch depth continuously decreased (p < 0.05), while width increased after the age of 18 years. Mandibular incisor crowding increased during all investigated periods (p < 0.05). The increase of intercanine width at 12-21 years of age reduced the risk for mandibular incisor crowding in the same period by 74% (OR: 0.265: 95% CI 0.076–0.931; p = 0.045). The shape of mandibular dental arch continues to change during adolescence becoming more squared while mandibular incisor crowding increases. The increase in mandibular intercanine width reduces the risk of crowding.
Mots-clefs
mandibular dental arch shape • mandibular incisor crowding • adolescence, environmental influence • hereditary influence