Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Oral (Radiology and Diagnosis)

Aim: The aim of this study was to evaluate the validity and reliability of electric potential difference (kVp), with and without the use of metal artifacts reduction tool (MAR), Can the usage of MAR protocols and electric Potential Difference (kVp) reduce the metallic artifacts resulting from metallic structures in CBCT? Methodology: Jaw models with the same radiodensity as the normal average human jaw bones with implant and full veneered crown inserted in them, were scanned by using Planmeca ProMax® 3D Mid CBCT machine, using different values of kVp, with and without the activation of MAR tool. Romexis® software was used for image analysis. For each implant linear measurements were measured (length & width), implants real length and width were used as gold standard. Bone-implant interface was assessed qualitatively & the length of the alveolar bone affected by the artifacts under the crown restorations from the crest of the ridge till the inferior border of the mandible was assessed quantitatively. Results: The activation of the MAR tool in the software yielded more accurate linear measurement as compared to the gold standard, as well as effectively reducing the effect of the artifacts in the CBCT images when compared to the effect of the different kVp values alone without MAR activation Conclusion: The activation of MAR tool in the software should be considered to reduce the effect of CBCT artifacts when scanning multiple metallic objects. Metal induced artifact limited the ability of CBCT in postoperative assessment of bone in intimacy with dental implants

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