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- Title
The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts.
- Authors
Lira de Farias Freitas, Ana Priscila; Rangel Peixoto, Larissa; Mariz Suassuna, Fernanda Clotilde; Meira Bento, Patrícia; Araújo Maia Amorim, Ana Marly; Rovaris Silva, Karla; de Almeida Barros, Renata Quirino; Pontual de Andrade Lima, Andrea dos Anjos; Pita de Melo, Daniela
- 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 (a<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.
- Subjects
CONE beam computed tomography; CEMENT; METALS
- Publication
Imaging Science in Dentistry, 2023, Vol 53, Issue 2, p127
- ISSN
2233-7822
- Publication type
Article
- DOI
10.5624/isd.20220185