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Influence of sharpening filters on the detection of root fractures using low-dose cone-beam computed tomography

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Abstract

Objectives

To evaluate the influence of sharpening filters in the detection of root fractures using low-dose cone-beam computed tomography (CBCT).

Materials and methods

Eighty-four CBCT volumes acquired at three mA levels of 28 teeth inserted in the dental socket of dry human skull were selected from a previous study. The teeth were divided into four groups according to the presence and absence of root fracture and endodontic filling. Five radiologists evaluated all CBCT volumes for the presence of root fracture with and without the application of “Sharpen 1x” and “Sharpen 2x” filters in OnDemand3D software. Area under the ROC curve (AUC), sensitivity, specificity, and inter- and intra-observer concordance were calculated and compared (α = 0.05).

Results

Sharpening filters did not lead to significant differences in AUC, sensitivity, and specificity at the three mA levels tested (p > 0.05), regardless of the presence of endodontic filling (p > 0.05). However, the significant reduction of AUC observed in CBCT volumes at 4 mA without filter (p < 0.05) ceased to exist after the application of filters (p > 0.05). Sensitivity and specificity ranged from low and moderate.

Conclusions

The use of sharpening filters can be recommended in CBCT volumes at 4 mA for root fracture detection for leading to the same performance as those at 6.3 and 10 mA. The presence of endodontic filling material did not influence the action of filters in the diagnosis of root fracture.

Clinical relevance

Sharpening filters seem to contribute to the diagnosis of root fracture in CBCT volumes acquired with reduced radiation dose.

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Funding

This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior — Brasil (CAPES) — Finance Code 001.

Author information

Authors and Affiliations

  1. Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School (FOP/UNICAMP), University of Campinas, Av. Limeira, 901, Piracicaba, SP, 13414-903, Brazil

    Alexandra Robles González, Deborah Queiroz Freitas & Matheus L. Oliveira

  2. Department of Oral Diagnosis and Surgery, Division of Oral Radiology, Araraquara Dental School, São Paulo State University (FOAr/UNESP), Araraquara, SP, Brazil

    Guilherme Monteiro Tosoni

Authors
  1. Alexandra Robles González
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  2. Guilherme Monteiro Tosoni
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  3. Deborah Queiroz Freitas
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  4. Matheus L. Oliveira
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Contributions

All authors contributed to the study’s conception and design. Material preparation and data collection were performed by Alexandra Robles González, Guilherme Monteiro Tosoni, and Matheus L. Oliveira and statistical analysis were performed by Deborah Queiroz Freitas. The first draft of the manuscript was written by Alexandra Robles González, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Matheus L. Oliveira.

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Ethical approval

All procedures performed in this study were conducted in accordance with the ethical standards of the Human Research Ethics Committee of Piracicaba Dental School, University of Campinas, Brazil (protocol number #36695920.4.0000.5418) and with the Helsinki Declaration.

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Not applicable.

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The authors declare no competing interests.

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González, A.R., Tosoni, G.M., Freitas, D.Q. et al. Influence of sharpening filters on the detection of root fractures using low-dose cone-beam computed tomography. Clin Oral Invest 26, 4797–4803 (2022). https://doi.org/10.1007/s00784-022-04444-7

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  • DOI: https://doi.org/10.1007/s00784-022-04444-7

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