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

• Published in: BMC medical imaging Vol. 19; no. 1; p. 34
• Main Authors: Shokri, Abbas, Jamalpour, Mohammad Reza, Khavid, Atefeh, Mohseni, Zeinab, Sadeghi, Masoud
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 29.04.2019; BioMed Central; BMC
• Subjects: Analysis; Animals; Bone Density; Bone implants; Bones; CAT scans; Cattle; Computation; Computed tomography; Cone-Beam Computed Tomography - methods; Conebeam computed tomography; Dental implants; Dental Implants - adverse effects; Dental prosthetics; Dental restorative materials; Dentists; Exposure; Field of view; Health aspects; Humans; Image processing equipment; Image quality; Imaging systems; Mandible; Mandible - diagnostic imaging; Medical diagnosis; Medical imaging; Metal artifacts; Metals; Methods; Models, Anatomic; Optical properties; Parameters; Placement; Radiographic Image Interpretation, Computer-Assisted; Reduction (metal working); Surgical implants; Tomography; Iran; Bone density; Conebeam computed tomography; Dental implants; Metal artifacts
• ISSN: 1471-2342; 1471-2342
• DOI: 10.1186/s12880-019-0334-4

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 a metal artifact of dental implants placed in different bone densities. A total of 27 bone blocks with different densities (nine were type 1, nine were types 2 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 a 4 × 6 cm and 6 × 8 cm FOV and 4 and 10 mA. Gray value of the bone blocks was recorded before and after placement of implants. In general, irrespective of bone density, the amount of artifacts was lower in small FOV compared to large FOV (P < 0.05). Change of mA had no effect on metal artifacts (P > 0.05). Artifacts in type 4 bone were greater than in other bone types (P < 0.05). Difference between type 1 and types 2 and 3 was not significant (P > 0.05). 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.