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Céphalométrie tridimensionnelle en orthopédie dento-faciale Les possibilités actuelles du logiciel Cépha 3dt Volume 73, issue 1, Mars 2002

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A 3D cephalometric analysis method from a scanner acquisition, has been developed thanks to a long collaboration between the CIRAD modeling Laboratory and Jacques Treil.

The model of skeletal description is based on eight landmarks related to the neuromatrical axis of facial growth (heads of the mallei, supraorbital, suborbital, submental points); it has been abundantly described. The purpose of this work consists in presenting the dentoalveolar level of the analysis. The description and the marking of the arches and the teeth mainly rest on the systematic use of a mathematical tool, the calculation of the central matrix of inertia, and on three fundamental choices:

- the identification of the dental arches from their constituting teeth leaving aside any alveolar marking,

- the marking of each tooth relative to the arch, as it can be observed by the orthodontist's eye, and not relative to the craniofacial architecture,

- the definition of the position of each tooth by the orientation of its coronoradicular axis and not its sole buccal side,

Their uses in orthodontics are numerous: diagnosis, choice of the mechanics, therapeutic simulation, therapeutic follow up, analysis of the findings... Clinical applications illustrate the theoretical presentation.