Yasmin A. Youssef , Noha S. Abu-Taleb And Hany M. Omar,

ABSTRACT

Objectives: To Evaluate The Effect Of Using Two Different Voxel Sizes (0.4mm And 0.2mm) On The Accuracy Of Cone Beam Computed Tomography In The Detection Of Simulated Mandibular Condylar Erosions.

Materials and Methods: Twelve Dry Human Mandibles (24 Condyles) Were Selected And Simulated Erosions Were Drilled On The Five Condylar Surfaces (superior, Anterior, Posterior, Medial And Lateral Surfaces). The Mandibles Were Scanned With PlanmecaPromax 3D Mid CBCT Machine Usingnormal And High Resolution Protocols (voxel Sizes: 0.4mm And 0.2mm Respectively).

Results: Regardingthe CBCT Normal Resolution Protocol(voxel Sizes: 0.4mm) The Sensitivity Of Detection Of The Simulated Defects Ranged From 87.05% To 94.96% And The Accuracy Values From 88.9% To 95.86% Among The Observers. However, Higher Values Were Found With The High Resolution Protocol (voxel Sizes: 0.2mm) Where The Sensitivity Values Increased To The Range Of 93.53% To 97.84% And Also Did The Accuracy Values With Range Of 94.44% To 98.15%.The Percentage Agreement Between Both Protocols Were 97.53% And 93.21% For The Two Observers. Conclusion: Despite The Higher Sensitivity And Diagnostic Accuracy Values Of The CBCTsmaller Voxel Size Protocol, Both Protocols Were Comparable In The Detection Of The Simulated Mandibular Condylar Erosions.