Antonious Naeem Ayad , Maha Eshak Amer And Mohamed Salah Abdel Motamed,

ABSTRACT


Purpose: Assessment The Accuracy Of CBCT In Detection Of Horizontal Root Fracture By Alternation Of Exposure Parameters In Endodontic Treated Teeth

Materials and Methods: 18 Single-rooted Human Teeth Will Be Selected Then Inspected By Trans-illumination For The Absence Of Root Fracture, And By Conventional Periapical Radiographs To Observe Root Canal Anatomy. Teeth With Caries Extending To The Root, Restorations, Pulp Calci?cations, Root Resorption Or Root Fracture Will Be Excluded. Finally Each Tooth Coded And Divided Into Two Groups:, Nine Teeth With Obturation With Guttapecha Only And Nine Teeth With Obturation With Gutta-percha And With Root Fracture. Then The Roots Of Teeth Will Be Fractured By Hummer With Standardized Force Perpendicular To The Long Axis Of The Tooth. Each 3 Teeth Will Be Mounted Separately In A Blocks That Will Be Made From Silicon Impression Putty. Then The Blocks Will Be Placed In A Fine Plastic Cylinder Containing Water To Simulate Soft Tissue. The Cylinder Will Be Placed On The Chin Rest Of CBCT Unit. The Teeth Will Be Imaged By Centering The Block In A Smallest Field-of-view FOV (H ? D) 50 ? 50 Mm. By Changing In Exposure Parameters (5 MA) With Standardized Resolution, (5 MA) With High Resolution, (10 MA) With Standardized Resolution And (10 MA) With High Resolution We Produce 72 Evaluations Detected By Three Radiologists.

Results: There Is No Significant Difference By Different Parameters Of CBCT To Detect HRF In Endodontic Treated Teeth With Gutta-percha. Standardized Resolution With (5 MA) Is The Most Specific Parameter To Detect HRFs In Endodontic Treated Teeth With Gutta-percha.

Conclusions: Diagnostic Accuracy Of CBCT In Detection Of HRFs Does Not Affected By Alternating Resolution And Milliampere.