Immediately after a careful flapless extraction of the teeth, (i) a cone beam computerized tomographic (CBCT) examination of the edentulous sites will be performed. The radiographic examination will be performed with the Planmeca ProMax3D unit (Planmeca Oy, Helsinky, Finland). The images will be acquired by means of the Planmeca Romexis software and processed by a computer. Acquisition will be performed for 24s (volumetric dimension of 8 x 8 cm) with the Planmeca tomography acquisition protocol: voxel size: 0.15 mm; Grey scale: 12 bits; focal spot: 0.5x0,5 mm; image detector: amorphous silicon flat panel; image acquisition: single 270° rotation. The images will be generated in DICOM format and the files of each patient will be saved and analyzed.