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KMID : 1024020230530020127
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Imaging Science in Dentistry
2023 Volume.53 No. 2 p.127 ~ p.135
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The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts
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Ana Priscila Lira de Farias Freitas
Larissa Rangel Peixoto
Fernanda Clotilde Mariz Suassuna
Patricia Meira Bento
Ana Marly Araujo Maia Amorim
Karla Rovaris Silva
Renata Quirino de Almeida Barros
Andrea dos Anjos Pontual de Andrade Lima
Daniela Pita de Melo
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Abstract
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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.
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KEYWORD
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Artifacts, Metals, Cone-Beam Computed Tomography, Zinc Phosphate Cement, Resin Cements
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