Computer tomography
To examine alveolar preservation, CT scans were performed at two time-points: (1) previous to extraction) and (2) after 6 months of biomaterial implantation. Based on an axial section of the upper jaw, the respective curvature was traced, over which radial sections perpendicular to it were obtained, with 1-mm-thick and 1-mm intervals. Also, 1-mm-thick panoramic representations were obtained, one according to the curve mentioned above and also in the palatal and in the vestibular direction with 2-mm intervals.