A semiautomatic approach to segment a central incisor along with itsperiodontal ligament (PDL) and the alveolus (tooth socket) from ComputedTomography (CT) and Digital Volume Tomography (DVT) recordings is presented.Clinical CT and DVT image series were combined in this study to mutuallycompensate for their individual weaknesses concerning the identification ofboundaries between the different segments. Three-dimensional rigid imagewarping is used to align the relevant objects in both series, allowing toapply masks of segments of one image stack on the other. The segmentationprocess involves the use of thresholds and manual refinements. In apostprocessing step, the segments are getting polygonized for smoothing andfinal inspection. It is found that a combined segmentation of CT and DVTdata allows for generating a complete model of the tooth and its alveolus inthe context of a range of applications. Keywords: DVT, CT, multimodal 3D reconstruction