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Published in French in Tropical Dental Journal Volume 29 - September 2006 pages 15-21
Article Open access
Authors : J.B. BEUGRE, N.K SONAN, A.M. KOUASSI, B. COURTOIS, F. BOUCAYS, M. CARLOS - Ivory Coast
Les auteurs proposent de matérialiser les axes corono-radiculaires des dents à partir de leur centre de gravité. Ce dernier est calculé avec les données de la matrice d’inertie résultant de la segmentation de coupes tomodensitométriques (TDM).
L’échantillon d’étude se compose de 37 sujets (16 femmes et 21 hommes) âgés de 15 à 65 ans, appartenant à une population ortho-morphique.
L’acquisition hélicoïdale des données est effectuée par un appareil CT Twin Flash (Elscint Haïfa, Israël) sur les sujets en décubitus dorsal sous 120 kV à 100 mAs. Le logiciel C2000 permet la reconstruction de la charpente maxillo-faciale à 8 points qui devient le repère absolu de l’étude. Le même logiciel permet par seuillage la sélection des dents sur les coupes natives. Le calcul de leur axe d’inertie permet de matérialiser leur barycentre. Il devient ainsi possible de visualiser la position et l’orientation de chaque dent à l’intérieur de la charpente maxillo-faciale et les rapports intra et inter arcades.
Les observations qui en découlent introduisent des interrogations quant à la pertinence de certains dogmes occluso-dontiques.
The authors propose to materialize the corono-radicular axes of the teeth starting from their centre of gravity. This last is calculated with the data of the matrix of inertia resulting from the segmentation from tomodensitometric cuts (TDM).
The sample is composed of 37 subjects (16 women and 21 men) old from 15 to 65 years, pertaining to a orthomorphic population.
The helicoid acquisition of the data is carried out by an apparatus CT Twin Flash (Elscint Haïfa, Israel) on the subjects in decubitus dorsal under 120 kV with 100 mAs. The software C2000 allows the building of the maxillo-facial frame 8 points which becomes the absolute reference mark of the study. The same software allows by thresholding the selection of the teeth on the native cuts. The calculation of their axis of inertia makes it possible to materialize their barycen-tre. It becomes thus possible to visualize the position and the orientation of each tooth inside the maxillo-facial frame and the intra-reports/ratios and inter-arcades.
The observations which result from this, introduce interrogations as for the relevance of certain dogmas occlusodontic.
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