Mahmoud Araby Elamadny And Maha Eshak Amer,

ABSTRACT

Objectives: This Study Is Aiming To Study The Validity Of CBCT In Preoperative Assessment Of Mandibular Third Molar To Avoid Nerve Injury, In Cases Where There Is Radiographic Evidence Of Close Proximity Between The Inferior Dental Canal And Mandibular Third Molar. Subjects And Methods: Thirty Patients Were Selected From The Out-Patient Clinic, Faculty Of Dentistry, Minia University For This Study. Patients Who Showed A Close Relationship Between The Mandibular Canal And The Third Molars Confirmed By Panoramic Radiographs Were Undergone CBCT Examination To Determine The Relationship Between The Inferior Alveolar Canal And Impacted Mandibular Third Molar. Two Radiologist Interpret The Images; And The Intra- And Inter Observer Correlation Were Calculated.

Results: Both The Intra And Inter Examiner Agreements Agreements Of Radiographic Signs Of Sites Of Mandibular Canal In CBCT And Presence Of Contact In CBCT Were Excellent Between The Two Observers (> .80) . Darkening Of The Roots And Interruption Of The White Line On DPR Images Were Significantly Associated With The Presence Of Contact Between The IMTM And The IAC On CBCT Images. Conclusion: CBCT Is Useful To Detect Relation Between IAC And IMTM, When Darkening Of The Roots And Interruption Of The White Line Are Observed On Panoramic Images, There Is Increased Likelihood Of Contact Between The IMTM And The IAC. CBCT Is Required In These Cases To Avoid Injury To IAC