Mapping the expression of beam hardening artefacts produced by metal posts positioned in different regions of the dental arch

Fontenele, Rocharles Cavalcante; Gomes, Amanda Farias; Rosado, Lucas de Paula Lopes; Neves, Frederico Sampaio; Freitas, Deborah Queiroz

doi:10.1007/s00784-020-03494-z

Cited by 12 publications

(5 citation statements)

References 18 publications

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“…Metal posts were associated with greater artifact intensity and, therefore, compromised CBCT diagnostic performance in previous studies. 4 5 15 17 Although the use of metal posts has tended to decrease due to fiber posts’ aesthetic properties, their similar elastic modulus to dentin, and their tendency to induce favorable root fractures, metal posts are still used when greater retention is needed as a consequence of insufficient remaining dentin. According to Sarkis-Onofre et al, 18 fiberglass and metal posts presented good and similar clinical performance; therefore, choosing a particular metal alloy that presents lower artifact intensity on CBCT scans can improve the final CBCT image quality.…”

Section: Discussionmentioning

confidence: 99%

“… 3 The intensity of artifacts produced by high-density materials such as metal posts is directly related to the atomic number of their constituents; higher-atomic-number materials lead to greater degradation of image quality. 2 4 5 6 7 Fiber posts are low-density materials that can be used to restore teeth that need intracanal retention; however, metal cores are still used when a large amount of dentin is lost and there is no adequate anchorage for the restoration. 8…”

Section: Introductionmentioning

confidence: 99%

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The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts

et al. 2023

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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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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts

et al. 2023

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“…It should be also emphasized that the cervical region is the most affected by artifacts in axial images, which justifies our choice for axial scans at 3.0 mm below the implant base. Also, as for the influence of tooth region on dental arches and artifacts, a study by Fontenele et al [ 28 ] reported that the posterior region of the mandible had lower grayscale values than the anterior regions. However, the study assessed artifacts produced by intracanal metal retainers made of different materials.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Quantitative Evaluation of Postprocessing Filter for Metal Artifact Reduction in Cone Beam Computed Tomography Images of Titanium and Zirconium Dioxide Implants

Costa

Fardim

Mantoani

et al. 2022

BioMed Research International

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Objective. To evaluate a postprocessing filter of a new imaging-processing software for analysis of metal artifact reduction. Methods. Eight artificial edentulous mandibles (phantoms), where titanium and zirconium dioxide implants had been installed in four different regions (i.e., incisors, canine, premolars, and molars). CBCT volume was acquired, and then, four types of filters were applied to the images: BAR filter and Multi-CDT NR filter (e-Vol DX) and Sharpening Filters 1x and 2x (OnDemand). Artifact was assessed by measuring the standard deviation (SD) of the gray values of filtered and unfiltered images. The comparison between implant material, teeth, and filters was performed by using ANOVA, whereas multiple comparisons were performed by using Bonferroni’s test. The level of significance adopted was 5%. Results. The results showing higher SD values, which suggests a worse image, were obtained with titanium implants compared to zirconium dioxide ones. With regard to the four filters used, it can be seen that the lowest SD values were obtained with BAR and Multi-CDT NR filters and the highest with Sharpening Filters 1x and 2x, with no statistical difference between them, except regarding the molar region in titanium implants. Conclusion. The highest SD values were seen in zirconium dioxide implants, mainly in the region of anterior teeth. The BAR filter was found to be the most effective as its SD value decreased significantly, indicating that the image quality was improved.

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“…Studies have shown that the different CBCT units [12,32,33] and exposure parameters (such as tube voltage, tube current, FOV and reconstructed voxel) lead to signi cant differences in the appearance of artifacts [14,34,35] . In this study, we used the same CBCT units and exposure parameters to eliminate the possible in uence of these different structures on gray value and area assessment.…”

Section: Discussionmentioning

confidence: 99%

Quantitative evaluation of artifact expression of mesoporous calcium silicate nanoparticles as a new promising root canal sealer in cone-beam computed tomography

Zhu

Chen

et al. 2022

Preprint

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Objectives: To quantitatively evaluate the artifact area of the image of mesoporous calcium silicate nanoparticles (MCSNs) using cone-beam computed tomography (CBCT).Methods: Forty single-rooted mandibular premolars were selected and prepared with NiTi rotary instruments to 35/0.04, and divided into four groups (n=10): (I) AH Plus sealer; (II) MCSNs sealer; (III) iRoot SP sealer and (IV) no sealer. There were filled with a single cone (35/0.04 taper) method. The roots were scanned using a CBCT with the same parameters before and after filling. The images were evaluated using ImageJ’s threshold tool to quantitatively determine the hyperdense and hypodense artifacts, and non-affected teeth areas within 8-bit images extracted from the scans.Results: MCSNs showed fewer hyperdense artifacts than AH plus and iRoot SP (P < 0.01), while the hypodense artifacts were not statistically significant among groups (P > 0.05).Conclusion: MSCNs can effectively reduce the generation of hyperdense artifacts in CBCT images and show better image qualities, indicating that they have a minor adverse effect on evaluating the quality of root canal filling and diagnosing root canal diseases in CBCT images.Clinical Relevance: As a novel type of root canal filling nanomaterials, MSCNs have less artifact expression and higher quality in CBCT images. Therefore, this new root filling material is expected to play a positive role in improving the correct clinical evaluation of root canal filling teeth and the visualization of root canal cracks and fractures.

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Mapping the expression of beam hardening artefacts produced by metal posts positioned in different regions of the dental arch

Cited by 12 publications

References 18 publications

The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts

The effects of different metal posts, cements, and exposure parameters on cone-beam computed tomography artifacts

In Vitro Quantitative Evaluation of Postprocessing Filter for Metal Artifact Reduction in Cone Beam Computed Tomography Images of Titanium and Zirconium Dioxide Implants

Quantitative evaluation of artifact expression of mesoporous calcium silicate nanoparticles as a new promising root canal sealer in cone-beam computed tomography

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