Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Oral (Radiology and Diagnosis)

Cone beam computed tomography (CBCT) is a modified, custom-made sequel of traditional computed tomography systems. It has been manufactured and designed specifically for oral and maxillofacial imaging. The benefits of the cone beam computed tomography (CBCT) are various. It has overcame numerous limitations of the conventional tomography including the low cost of the device itself, smaller size of the machine and much lower radiation dose compared to conventional CT. Cone beam computed tomography is a powerful diagnostic tool in the oral and maxillofacial field. It has become the dentist{u2019}s third eye in terms of detection of the maxillofacial abnormalities as well as the pre-surgical planning and surgical guidance with the use of advanced softwares that can be manipulated in various forms. However the exposure parameters used in the CBCT scanning has a direct effect on the radiation dose delivered to the patient. This study was designed to investigate the accuracy of cone beam computed tomography in maxillary and mandibular linear using varying effect of electric current Intensity (milliamper) of cone beam computed tomography machine. The study sample included thirty three human dry skulls with mandibles. On each skull, three sites were selected in the anterior, premolar and molar areas with one site in each area. The selected sites were marked on the maxilla and mandibles using permanent marker on the labial/buccal and lingual surfaces, various vertical summary and conclusion and horizontal measurements were taken using a digital caliper, then gutta percha markers were fixed in the previously measured points

Issued also as CD