Imaging Sci Dent.
2023 Jun;53(2):127-135. 10.5624/isd.20220185.
The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts
- Affiliations
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- 1Department of Oral Diagnosis, State University of Paraíba, Campina Grande, PB, Brazil
- 2Department of Oral Diagnosis, Federal University of Piauí, Teresina, PI, Brazil
- 3Departmentof Oral Imaging of Unifacisa, Campina Grande, PB, Brazil
- 4Department of Oral Diagnosis, Federal University of Pernambuco, Campina Grande, PB, Brazil
- KMID: 2543920
- DOI: http://doi.org/10.5624/isd.20220185
Abstract
- Purpose
This study assessed the intensity of artifacts produced by 2 metal posts, 2 cements, and different exposure parameters using 2 cone-beam computed tomography (CBCT) units.
Materials and Methods
The sample was composed of 20 single-rooted premolars, divided into 4 groups: Ni-Cr/ zinc phosphate, Ni-Cr/resin cement, Ag-Pd/zinc phosphate, and Ag-Pd/resin cement. Samples were scanned before and after post insertion and cementation using a CS9000 3D scanner with 4 exposure parameters (85/90 kV and 6.3/10 mA) and an i-CAT scanner with 120 kV and 5 mA. The presence of artifacts was assessed subjectively by 2 observers and objectively by a trained observer using ImageJ software. The Mann-Whitney, Wilcoxon, weighted kappa, and chi-square tests were used to assess data at a 95% confidence level (α<0.05).
Results
In the subjective analyses, AgPd presented more hypodense and hyperdense lines than NiCr (P<0.05), and more hypodense halos were found using i-CAT (P<0.05) than using CS9000 3D. More hypodense halos, hypodense lines, and hyperdense lines were observed at 10 mA than at 6.3 mA (P<0.05). More hypodense halos were observed at 85 kV than at 90 kV (P<0.05). CS9000 3D presented more hypodense and hyperdense lines than i-CAT (P<0.05). In the objective analyses, AgPd presented higher percentages of hyperdense and hypodense artifacts than NiCr (P<0.05). Zinc phosphate cement presented higher hyperdense artifact percentages on CS9000 3D scans (P<0.05). CS9000 3D presented higher artifact percentages than i-CAT (P<0.05).
Conclusion
High-atomic-number alloys, higher tube current, and lower tube voltage may increase the artifacts present in CBCT images. (Imaging Sci Dent 2023; 53: 127-35)
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