الفهرس 
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Abstract
ABSTRACT : Objective: This study aimed to evaluate the effect of variant milliampere setting on appearance of metal artifacts in Cone Beam Computed Tomography. Methods : A dry human mandible with three titanium implants in anterior, premolar, and molar areas was scanned by CRANEX 3Dx CBCT unit utilizing variant mA setting, then, gray values were derived to detect metal artifacts in two different trials. Results : In our study, there was insignificant difference between Trail I and Trial II in gray value measure as P-value > 0.05, there was insignificant difference in gray value when varying mA setting in anterior, premolar, and molar areas, except few conditions, and there was significant difference in gray value between anterior area and posterior area (premolar, molar). Conclusion : Metal artifacts exist constantly around dental implant in CBCT images and the anatomical region determines the amount of artifacts, which increased anteriorly more than posteriorly. There’s no obvious difference in gray value by increasing mA setting, however, from interpretation of gray values, S2 exposure setting (8mA, 90 kVp and 2.3s with 6x8cm field of view) in anterior area, and H4 exposure setting (10mA, 90 kVp and 6.1s with 6x8cm field of view) in premolar and molar areas, have the least mean gray value, and thereafter less amount of metal artifacts and better image quality.