Influence of CBCT parameters on image quality and the diagnosis of vertical root fractures in teeth with metallic posts: an ex vivo study
Larissa Pereira Lagos de Melo, Polyane Mazucatto Queiroz, Larissa Moreira-Souza, Mariana Rocha Nadaes, Gustavo Machado Santaella, Matheus Lima Oliveira, Deborah Queiroz Freitas,
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( Larissa Pereira Lagos de Melo ) -
( Polyane Mazucatto Queiroz ) -
( Larissa Moreira-Souza ) -
( Mariana Rocha Nadaes ) -
( Gustavo Machado Santaella ) -
( Matheus Lima Oliveira ) -
( Deborah Queiroz Freitas ) -
Abstract
Objectives: The aim of this study was to evaluate the influence of peak kilovoltage (kVp) and a metal artifact reduction (MAR) tool on image quality and the diagnosis of vertical root fracture (VRF) in cone-beam computed tomography (CBCT).
Materials and Methods: Twenty single-rooted human teeth filled with an intracanal metal post were divided into 2 groups: control (n = 10) and VRF (n = 10). Each tooth was placed into the socket of a dry mandible, and CBCT scans were acquired using a Picasso Trio varying the kVp (70, 80, 90, or 99), and the use of MAR (with or without). The examinations were assessed by 5 examiners for the diagnosis of VRF using a 5-point scale. A subjective evaluation of the expression of artifacts was done by comparing random axial images of the studied protocols. The results of the diagnoses were analyzed using 2-way analysis of variance and the Tukey post hoc test, the subjective evaluations were compared using the Friedman test, and intra-examiner reproducibility was evaluated using the weighted kappa test (α = 5%).
Results: The kVp and MAR did not influence the diagnosis of VRF (p > 0.05). According to the subjective classification, the 99 kVp protocol with MAR demonstrated the least expression of artifacts, while the 70 kVp protocol without MAR led to the most artifacts.
Conclusions: Protocols with higher kVp combined with MAR improved the image quality of CBCT examinations. However, those factors did not lead to an improvement in the diagnosis of VRF.
키워드
Artifacts; Cone-beam computed tomography; Diagnostic imaging; Vertical root fracture
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