Assessment of artefacts produced by metal posts on CBCT images

• Published in: International endodontic journal 2019-02, Vol.52 (2), p.223-236
• Main Authors: Lira de Farias Freitas, A. P., Cavalcanti, Y. W., Costa, F. C. M., Peixoto, L. R., Maia, A. M. A., Rovaris, K., Bento, P. M., Melo, D. P.
• Format: Article
• Language: English
• Subjects: Alloys; Artefacts; Computed tomography; cone beam computed tomography; Dentistry; Endodontics; Image processing; imaging; Teeth; three‐dimensional
• ISSN: 0143-2885; 1365-2591
• DOI: 10.1111/iej.12999

Aim To evaluate artefact intensity in cone beam computed tomography (CBCT) images of two alloys used in metal posts scanned using different exposure parameters. Methodology The sample consisted of 20 single‐rooted teeth divided into two groups for use with either a NiCr post or AgPd post. All teeth were scanned with and without their corresponding metal posts and with and without the presence of an extra restored tooth in the arch. The samples were scanned using CS 9000 3D scanner with two exposure protocols: 85 kV 6.3 mA and 85 kV 10 mA. Voxel size and FOV were fixed at 0.100 mm and 5 cm × 3.75 cm. The presence of artefacts was assessed qualitatively by two calibrated observers using the CBCT volume and paired 2D images, and quantitatively by one trained observer, using ImageJ software. Wilcoxon's signed rank, Mann–Whitney, kappa and chi‐square tests were used for qualitative analyses. Two‐way anova and Tukey's tests were used for quantitative analyses. All analyses were conducted considering the 95% confidence level (α