The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts
- Author:
Ana Priscila Lira de Farias FREITAS
1
;
Larissa Rangel PEIXOTO
;
Fernanda Clotilde Mariz SUASSUNA
;
Patrícia Meira BENTO
;
Ana Marly Araújo Maia AMORIM
;
Karla Rovaris SILVA
;
Renata Quirino de Almeida BARROS
;
Andrea dos Anjos Pontual de Andrade LIMA
;
Daniela Pita de MELO
Author Information
- Publication Type:Original Articles
- From:Imaging Science in Dentistry 2023;53(2):127-135
- CountryRepublic of Korea
- Language:English
-
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)
