Menna Mosaad El Said , Alaa Nawwar And Farid Medhat ,

ABSTRACT

Objectives: The Study Aimed To Assess The Distance Between Root Apices Of Mandibular Premolars And Molars And The Superior Border Of The Cortical Boundary Of The Inferior Alveolar Canal (IAC) Among A Sample Of Egyptian Population. Materials And Methods:. The Study Was A Cross Sectional Retrospective Study Performed On 172 Mandibular Permanent Premolars And Molars From 43 CBCT Scans Belonging To Egyptian Individuals. Radiographic Examination Was Done Using Planmeca Promax 3D Mid CBCT Machine With Image Capture Parameters Set At?FOV Of 20 X 20 Cm, 90 KV, 8 MA And An Exposure Time Of 13.5 Seconds. The Voxel Size Was 0.4 Mm

Results: A Total Of 41 Second Mandibular Premolars And 42 First And 42 Second Mandibular Molars Were Included, The Longest Mean Distance To The Inferior Alveolar Canal Was Recorded By Mesial Root Of First Molar With Mean Distance 4.78 ? 2.52 Mm, Followed By The Distal Root Of The First Molar (4.2 ? 2.37), Second Premolars (3.13? 2.6), Then Mesial Root Of Second Molar Which Showed Mean Distance Of 2.42? 2.06. The Distal Root Of The Second Molar Was The Closest To The IAC, With An Average Distance Of 1.7 ? 1.95 Mm. Conclusion: Within The Limitations Of This Study, The Roots Of The Second Molars Were Significantly Closer To The Canal Than The Roots Of The First Molars And First And Second Premolars.