Omar M. Sammour, Farid Medhat And Hossam Kandil,

ABSTRACT

Objectives: Assessment Of Accuracy Of Cone Beam Computed Tomography And Electronic Apex Locator In Working Length Measurement Compared To The Actual Tooth Length. Methods: It Was Performed On Twenty Three Human Extracted Teeth. Teeth Was Collected From Outpatient Clinic Of Oral Surgery, Faculty Of Dentistry, Cairo University. Single Rooted Incisors And Canines, With Intact Roots And Crowns Were Used. Access Cavities Were Done To The Teeth To Provide Unrestricted Access To The Canal. The Teeth Were Numbered And Embedded In An Alginate Model Developed To Test Apex Locators. For The Electronic Measurements, The Root ZX Mini? Number Series R6 (J Morita Corp. Kyoto, Japan) Was Used. Teeth In Models Were Radiographed Using Planmeca ProMax 3D Mid CBCT Machine (Asentajankatu, Helsinki, Finland) In Oral And Maxillofacial Radiology Department At Faculty Of Oral And Dental Medicine, Cairo University. All Teeth With Models Were Radiographed Using 8 MA, (?50 Mm X 80 Mm) Field Of View (FOV) Using Stitching And Resolution Of 0.2 �m Voxel At An Exposure Time Of 12 Seconds. The CBCT Images Were Obtained By Two Blinded Calibrated Oral And Maxillofacial Radiologists With Different Years Of Experience. Real Measurements Were Performed Using An Endodontic Ruler, K-Flex File #15 Used For The Electronic Measurement Into Each Canal Until The Tip Became Visible Through The Major Foramen. Results Yielded Was Subjected To Intra- And Inter-observer Agreement Was Assessed Using Intra-Class Correlation Coefficient (ICC). Paired T Test To Determine If There Is A Difference Between The 2 Methods.

Results: There Was Intra And Inter Observer Reliability Ranging From- ICC (0.994 To 0.999) -which Was Excellent And No Statistical Significance Difference Between Apex Locator & CBCT In WL Determination. Conclusion: Measurements Driven From CBCT Images Of Planameca Promax 3D Mid? & Electronic Measurements By The Root ZX Mini? Are Accurate And Reliable For All Endodontic Applications.