Effect of exposure parameters of cone beam computed tomography on metal artifact reduction around the dental implants in various bone densities

Background and Objective: This study aimed to assess the effect of exposure parameters such as milliampere (mA) and field of view (FOV) of cone beam computed tomography (CBCT) on metal artifact of dental implants placed in different bone densities.Materials and Methods: A total of 72 bone blocks with different densities (nine were type 1, nine were types 7 and 3 and nine were type 4) were used in this in vitro, experimental study. These blocks were placed in mandibular wax models. The blocks were scanned after drilling (hole preparation) and after implant placement using Cranex3D imaging system with 4x6 cm7and 6x8 cm7 field of view (FOV) and 4 and 11mA. Gray value of the bone blocks was recorded before and after placement of implants. Data were analyzed using SPSS 16 via repeated measures ANOVA and LSD test.Finding: Discussion In general, irrespective of bone density, the amount of artifacts was lower in small FOV compared to large FOV (P<1010). Change of mA had no effect on metal artifacts (P> 1010). Artifacts in type 4 bone were greater than in other bone types (P<1010). Difference between type 1 and type 7,3 not significant (p> 1010)Conclusion: According to the results of this study, Peri-implant artifacts were seen in all bone types; the amount of artifacts in type 4 bone was higher than that in other types. Size of FOV and bone density affect the metal artifacts around dental implants; so that a smaller FOV can be used to decrease metal artifacts

Keywords:

Cone-Beam Computed Tomography , Dental Implants , Metal Artifacts , Bone Density