Asmaa Yousry Tawfiq, Hoda Abdel Kader Saleh And Salma Belal Eiid,
ABSTRACT
Purpose: To Investigate The Diagnostic Accuracy Of Ultra Low Dose-Cone Beam Computed Tomography Protocol In Detection Of External Root Resorption In Mandibular Teeth.
Materials and Methods: Twenty Extracted Human Mandibular Intact Roots Were Recruited In This In-vitro Diagnostic Study. Simulated Resorptive Defects Of Various Standardized Sizes (0.5mm-0.9mm-1mm) Were Drilled On Each Root Using Inverted Cone Burs With Different Sizes Mounted On Low Speed Hand-piece. Some Sites Were Left Intact On Each Root To Act As Control Sites. The Total Number Of Simulated Defects Was 180 Distributed Randomly On Different Root Surfaces, While A Total Of 60 Sites Were Left Intact. Prepared Roots Were Fitted Into Corresponding Sockets Of A Mandible To Be Scanned By Ultra Low Dose-Cone Beam Computed Tomography Protocol (90 Kvp, 5.6 MA, 4 Seconds) Using A 0.2 Mm Voxel Size And A Field Of View 4x5 Cm .
Results: Ultra Low Dose-Cone Beam Computed Tomography Protocol Had An Overall Sensitivity Of (71%), And Overall Specificity Of (96%). The Diagnostic Accuracy In This In Vitro Study Was (77%). The Positive Predictive Value Recorded Was (98%), While The Negative Predictive Value Was (52%). The Positive Likelihood Ratio Was (18) And The Negative Likelihood Ratio Was (0.3).
Conclusion: Ultra Low Dose-Cone Beam Computed Tomography Protocol Could Be Used For Detection Of External Root Resorption With Comparable Diagnostic Accuracy To Standard Protocols But With Significantly Less Radiation Dose.
