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Effect of brightness and contrast variation for detectability of root resorption lesions in digital intraoral radiographs

  • Eduarda Helena Leandro Nascimento
  • Hugo Gaêta-Araujo
  • Neiandro Santos Galvão
  • Larissa Moreira-Souza
  • Christiano Oliveira-Santos
  • Deborah Queiroz Freitas
Original Article
  • 5 Downloads

Abstract

Objectives

To evaluate the performance of periapical radiography assessed under different radiographic brightness and contrast variations in the detection of simulated internal (IRR) and external (ERR) root resorption lesions. Additionally, observers’ preferences related to image quality for these diagnostic tasks were evaluated.

Methods

Thirty single-root teeth were divided into two groups (n = 15): IRR, in which lesions were simulated using mechanical and biochemical processes; and ERR, in which cavities standardized with drills of different sizes were performed on the root surfaces. Digital radiographs were obtained and subsequently adjusted in 4 additional combinations, resulting in 5 brightness/contrast variations (V1–V5). Five radiologists evaluated the radiographs. The observers’ preference on the image quality was also recorded.

Results

For both conditions, there were no differences in the accuracy and specificity between the five brightness/contrast variations (p > 0.05), but the sensitivity for ERR was significantly lower in V4 (+ 15% brightness/−15% contrast) in the large size (p < 0.05). The observers classified V2 (− 15% brightness/+15% contrast) as the “best” image quality for IRR and ERR evaluation.

Conclusions

For IRR and ERR lesions, brightness and contrast variation does not affect the diagnostic performance of digital intraoral radiography within the tested range. The observers prefer images with a reasonable decrease in brightness and increase in contrast.

Clinical relevance

Brightness and contrast enhancement tools are commonly applied in digital radiographic assessment. The use of these tools for detection of root resorptions can be applied according to the observer preference without influence on diagnostic accuracy.

Keywords

Endodontics Digital radiography Radiographic image enhancement Root resorption 

Notes

Funding

The work was supported by the Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Campinas, SP, Brazil.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in this study were conducted in accordance with the ethical standards of the institutional Research Ethics Committee of the Piracicaba Dental School, UNICAMP (#2.057.024), and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Eduarda Helena Leandro Nascimento
    • 1
  • Hugo Gaêta-Araujo
    • 1
  • Neiandro Santos Galvão
    • 1
  • Larissa Moreira-Souza
    • 1
  • Christiano Oliveira-Santos
    • 2
  • Deborah Queiroz Freitas
    • 1
  1. 1.Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental SchoolUniversity of Campinas (UNICAMP)PiracicabaBrazil
  2. 2.Department of Stomatology, Public Healthand Forensic Dentistry, Division of Oral Radiology, School of Dentistry of Ribeirao PretoUniversity of Sao PauloRibeirao PretoBrazil

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