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

Aim: Detection of the prevalence of bifid mandibular canal and classification of its types in the Egyptian population. Methodology: Radiographic examination of 329 mandibular canals was done using Planmeca Promax 3D Mid CBCT machine. The scans varied depending on patients{u2019} sizes (according to the manufacturer{u2019}s recommendations) using different FOVs with the same voxel size (0.4 mm (400 om)). For the inferior alveolar canal assesment, the Planmeca Romexis software viewer version 4.6.2.R (Planmeca) was used. The bifid the mandibular canal was observed and classified according to Naitoh`s classification (retromolar, dental, forward, and buccolingual canals). In addition, the prevalence of location of accessory canal types and the mean distance to the alveolar ridge and teeth were reported. Results: In 329 mandibular canals, there were 101 bifid canals (30.7%) and 37 trifid canals (11.2%). The dental canal type was the most common (43.3%), followed by retromolar canal type (33.7%), forward canal type (17.2%), and buccolingual canal type (5.7%).Conclusion: Examination of the mandibular canal is mandatory by surgeons to minimize the chance of missing any accessory branches, since its prevalence was more than 40% with 21.3 % presented with bilateral manifestation

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