[Three-dimensional imaging of root axes in patients from X-ray computed tomography slices].

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 barycentre. 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.