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

{u2018}Fenestration{u2019} and {u2018}Dehiscence{u2019} denote two different patterns of interruption in normal alveolar bone contour, they were considered by most of the periodontists as variations within the range of periodontal normalcy. However if they are not properly diagnosed and well considered, they could complicate various dental treatment procedures and outcomes. On the hand, the dentist could be the one responsible for creation of such defects as an iatrogenic error during dental treatment procedures. For that, proper knowledge of their nature, prevalence, frequent locations, and associated factors was mandatory. Hence, this study was conducted to evaluate the frequency of root fenestration and dehiscence at different teeth types in a sample of Adult Egyptian population using Cone Beam Computed Tomography. A sample of 100 CBCT scans of 30 males and 70 females (involving 2576 Teeth )belonging to Adult Egyptian individuals were collected from the patients{u2019} data base of Planmeca Promax 3D Mid CBCT machine available at the department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Cairo university. Identification of Fenestration and Dehiscence was done using the identification criteria first mentioned by Davies et al 1974. As{u2018}Dehiscence{u2019}was identified as loss of alveolar bone on the facial or lingual aspect of a tooth that leaves a characteristic oval or V- shaped, root-exposed defect from the cemento-enamel junction CEJ apically, while {u2018}Fenestration{u2019} was identified as a "window" of bone loss on the facial or lingual aspect of a tooth that spares alveolar margin intact. These identifications were made on CBCT cross sectional images that were corrected to be with the long axis of each tooth under examination. Fenestrations were further classified according to their location on the rootsurface (cervical, middle and apical) while dehiscences were classified according to their severity (mild, moderate and severe)

Issued also as CD