This paper presents a novel image processing procedure dedicated to the automated
detection of the medial axis of the root canal from dental micro CT records. The 3D
model of root canal is built up from several hundreds of parallel cross sections,
using image enhancement and segmentation, center point detection in the segmented
slice, three dimensional inner surface reconstruction and morphological skeleton extraction
in three dimensions. The central line of the root canal is interpolated as a 3D spline
curve. The proposed procedure can help prepare several kinds of endodontic interventions.