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Tropical Dental Journal - 1st Pan African international dental journal


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Published in English in Tropical Dental Journal Volume 36 - June 2013 pages 5-14

Three-dimensional facial architecture in normodivergent class I Caucasian subjectsThree-dimensional facial architecture in normodivergent class I Caucasian subjects est évalué 4.66666666666667 étoiles par les abonnés Tropical Dental Journal Online

Article Open access

Authors : J.V. Ghoubril, F.M. Abou Obeid - Lebanon


Résumé

Introduction : L'objectif de cette étude est de (1) définir l'architecture faciale chez les patients Caucasiens normo-divergents en classe I squelettique et dentaire à partir d'une acquisition tomodensitométrique tridimensionnelle en utilisant l'analyse de Treil, et (2) trouver un concept d'équilibre ou de normalité individuelle concernant les paramètres linéaires, angulaires et volumiques.
Matériels et méthodes : L'échantillon comporte 60 sujets également répartis entre les deux sexes. A partir de repères anatomiques situés sur les axes trigéminaux de la croissance neuro-matricielle de la face, un modèle tridimensionnel de l'architecture maxillo-faciale a été construit.
Résultats : Les paramètres linéaires et volumiques sont plus grands chez les hommes (0,000 < p < 0,044) à l'exception des largeurs mandibulaires antérieure et postérieure. Le dimorphisme sexuel n'a pas été observé au niveau des paramètres angulaires. Les tests de corrélation ont montré que le volume total de la charpente augmente avec les profondeurs sous et sus-orbitaires, la largeur mandibulaire postérieure et la hauteur faciale (0,526 < r < 0,777), alors qu'il n'était pas associé à la largeur maxillo-orbitaire (0,252 < r < 0,389). Les volumes orbitaire et total sont plus corrélés avec la largeur mandibulaire postérieure qu'ave cl'antérieure. Le volume maxillo-mandibulaire est corrélé avec la profondeur orbitaire (0,591<r<0,742) plus que le volume orbitaire (0,482 < r < 0,589).
Conclusion : Les résultats nous ont permis d'établir des normes céphalométriques tridimensionnelles, et de remplacer le principe de normalité, qui est une valeur moyenne des paramètres calculés, par la notion d'équilibre individuel entre entités volumétriques. Tandis que les dimensions sagittale et verticale affectent les changements volumétriques de la charpente, la dimension transversale n'a aucune influence.

Abstract
Three-dimensional facial architecture in normodivergent class I Caucasian subjects

Introduction: The aims of this study were to (1) define facial architecture in Caucasian patients with normodivergent, skeletal and dental class I using Treil's cephalometric analysis, which is based on computed tomography (CT), and (2) develop a scheme to determine individual balance or normality in relation to linear, angular and volumetric parameters.
Material and methods: The CT data of 60 adult subjects were equally divided between both genders. Based on anatomical points located along the trigeminal neuro-matricial facial growth axes, a three dimensional maxillo-facial architecture was constructed.
Results: Volumetric and linear parameters were greater in males (0.000 < p< 0.044) except for the anterior and posterior mandibular width. Sexual dimorphism was not observed with angular parameters. There was no correlation between volumetric and angular parameters. The correlation tests showed that the total volume of the frame increases with infraorbital depth, supraorbital depth, posterior mandibular width and facial height (0.526 < r < 0.777), while it was not associated with the maxillo-orbital width (0.252 < r < 0.389). Total and orbital volumes were more correlated with posterior than with anterior mandibular width. Maxillo-mandibular volume of the frame was more cor-related with orbital depth (0.591 < r < 0.742) than the orbital volume (0.482 <r < 0.589).
Conclusions: The results allowed us to establish three-dimensional cephalometric standards, and to replace the tenet of normality, which is a mean value of calculated parameters, by the concept of individual balance among volumetric entities. While sagittal and vertical dimensions affect volumetric changes of the frame, the transverse dimension does not.

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