In this study the structure of the adult human dentoalveolar process is examined using conventional and synchrotron radiation-based microtomography (SRµCT). Mandibular and maxillary segments containing two to five adjacent teeth were harvested at autopsy from 49 adult donors. These segments were embedded in blocks of methylmetacrylate and scanned using a conventional table-top µCT-scanner at a pixel size and slice thickness of 35 µm. A few segments were also scanned at a synchrotron facility at an initial pixel size of 16.4 µm, which was binned by a factor 2 to result in an effective voxel size of almost 32.8 µm. The three-dimensional reconstructions revealed how intricately the teeth are supported by the alveolar bone. Furthermore, this support is highly inhomogeneous with respect to the buccal, mesial, lingual and distal quadrants. Reflecting their various degrees of mineralization, tissues like bone, dentine, enamel and cementum, could well be identified, especially in the scans made with SRµCT. Despite comparable voxel sizes, the reconstructed data-sets obtained with conventional µCT were less detailed and somewhat fuzzy in appearance compared to the data-sets of SRµCT. However, for quantification of macroscopical features like the thickness of the alveolar wall or the presence of dehiscences/fenestrations this seemed sufficient.
The signs of ongoing displacement of lower teeth support the concept of crowding occurring in adult individuals and support the maintenance of retainers, even following cessation of growth.
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