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. 2018 Dec;47(8):20180100.
doi: 10.1259/dmfr.20180100. Epub 2018 Jun 15.

Influence of brightness and contrast adjustments on the diagnosis of proximal caries lesions

Eduarda Hl Nascimento  1 , Hugo Gaêta-Araujo  1 , Karla F Vasconcelos  1 , Bernardo B Freire  1 , Christiano Oliveira-Santos  2 , Francisco Haiter-Neto  1 , Deborah Q Freitas  1
Affiliations

Influence of brightness and contrast adjustments on the diagnosis of proximal caries lesions

Eduarda Hl Nascimento et al. Dentomaxillofac Radiol. 2018 Dec.

Abstract

Objectives: To assess the influence of brightness and contrast adjustments of digital radiographs on the diagnosis of proximal caries lesions, and to compare with observers' preferences for subjective image quality.

Methods: 80 proximal surfaces of posterior teeth were radiographed using an intraoral digital system (Digora Toto, Soredex, Finland). Initial images and four different combinations of brightness and contrast for each radiography were analysed. Five observers scored the images for the presence and extension of caries lesions. Micro-CT images were used as gold standard. In a second stage, the observers were asked which of the radiographs they preferred for the assessment of caries lesions.

Results: No differences were found between the original and adjusted radiographic images regarding the area under the receiver operating characteristic curve, sensitivity, and specificity (p > 0.05). There was a significant difference between the micro-CT and the intraoral radiographs (p < 0.0001). Images with high brightness and low contrast presented higher number of true negative cases, but also a decrease in caries detection. On the other hand, there were more cases of overestimation of the presence and extension of caries lesions in images with low brightness and high contrast. The subjective evaluation of image quality showed that radiographs with lower brightness and higher contrast tended to be preferred by observers.

Conclusions: Brightness and contrast adjustments in digital intraoral radiographs within the range tested in this study do not significantly influence the diagnosis of proximal caries lesions, although observers tend to prefer lower brightness and higher contrast images.

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Figures

Figure 1.
Figure 1.
Acrylic device set, silicone phantom holding teeth in position, aluminum step wedge and sensor used to radiographic acquisitions.
Figure 2.
Figure 2.
Radiographic images randomly displayed in a slide for subjective image quality evaluation.
Figure 3.
Figure 3.
Radiographic images of the region of premolar teeth adjusted in the five brightness and contrast variations (V1–V5) showing caries lesions reaching only the enamel (mesial and distal surfaces of the first premolar) and a caries lesion reaching enamel and dentin (distal surface of the second premolar).
Figure 4.
Figure 4.
Distribution of brightness and contrast variations according to the observers’ preference for diagnosis of proximal caries lesions.
See this image and copyright information in PMC

References

    1. World Health Organization (WHO). Sugars and dental caries. Geneva: WHO. 2017. Available from: http://apps.who.int/iris/bitstream/10665/259413/1/WHO-NMH-NHD-17.12-eng.pdf [accessed 26 January 2018].
    1. Wenzel A. Radiographic display of carious lesions and cavitation in approximal surfaces: advantages and drawbacks of conventional and advanced modalities. Acta Odontol Scand 2014; 72: 251–64. doi: 10.3109/00016357.2014.888757 - DOI - PubMed
    1. Kayipmaz S, Sezgin ÖS, Saricaoğlu ST, Çan G. An in vitro comparison of diagnostic abilities of conventional radiography, storage phosphor, and cone beam computed tomography to determine occlusal and approximal caries. Eur J Radiol 2011; 80: 478–82. doi: 10.1016/j.ejrad.2010.09.011 - DOI - PubMed
    1. Haak R, Wicht MJ, Noack MJ. Conventional, digital and contrast-enhanced bitewing radiographs in the decision to restore approximal carious lesions. Caries Res 2001; 35: 193–9. doi: 10.1159/000047455 - DOI - PubMed
    1. Kajan ZD, Tayefeh Davalloo R, Tavangar M, Valizade F. The effects of noise reduction, sharpening, enhancement, and image magnification on diagnostic accuracy of a photostimulable phosphor system in the detection of non-cavitated approximal dental caries. Imaging Sci Dent 2015; 45: 81–7. doi: 10.5624/isd.2015.45.2.81 - DOI - PMC - PubMed