Multi-detector Computed Tomography Versus Cone Beam Computed Tomography as a Diagnostic Imaging in Retrieval of Displaced Mandibular Third Molar Teeth/Roots

Sixteen patients will included in this study that they had previously a challenging and unsuccessful extraction of an impacted mandibular third molar by a general dentist under local anesthesia.

Groups allocation:

For detailed radiographic examination, when a displaced tooth/root fragment is suspected the patients will randomly divided into two equal groups, each of eight patients:

Group (1): Multi-detector computed tomography (MDCT ) are performed using CT scanner (SOMATOM Emotion6, Siemens, Germany). The protocol is 200 mAs, 120 kVp, 512 × 512 matrix, 1.172 pitch, 64 × 0.625 mm section collimation, 2 mm slice thickness, 0.6 mm section reconstruction Group (II): CBCT** scans are performed with an exposure performed at 15 mA, 85 KV and at a field of view 7.5 cm x 14.5 cm x 14.5 cm.

Image reconstruction All images will be reconstructed at 0.6 mm and the reconstructed axial images are transferred to a workstation, and multi-planar reconstructions are generated using the included standard dental software package. The panoramic and paraxial images were obtained perpendicular to the transverse images. Then multi-planar reformation (MPR), maximum intensity projection (MIP) and shaded surface display (SSD) are done in different planes.