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Comparative Study
. 2011 Sep;40(6):338-43.
doi: 10.1259/dmfr/67185962.

Evaluation of proximal caries in images resulting from different modes of radiographic digitalization

C R G Xavier  1 , Ana Claudia Araujo-Pires, M L Poleti, I R F Rubira-Bullen, O Ferreira Jr, A L A Capelozza
Affiliations
Comparative Study

Evaluation of proximal caries in images resulting from different modes of radiographic digitalization

C R G Xavier et al. Dentomaxillofac Radiol. 2011 Sep.

Abstract

Objective: The aim of this study was to evaluate the performances of observers in diagnosing proximal caries in digital images obtained from digital bitewing radiographs using two scanners and four digital cameras in Joint Photographic Experts Group (JPEG) and tagged image file format (TIFF) files, and comparing them with the original conventional radiographs.

Method: In total, 56 extracted teeth were radiographed with Kodak Insight film (Eastman Kodak, Rochester, NY) in a Kaycor Yoshida X-ray device (Kaycor X-707; Yoshida Dental Manufacturing Co., Tokyo, Japan) operating at 70 kV and 7 mA with an exposure time of 0.40 s. The radiographs were obtained and scanned by CanonScan D646U (Canon USA Inc., Newport News, VA) and Genius ColorPage HR7X (KYE Systems Corp. America, Doral, FL) scanners, and by Canon Powershot G2 (Canon USA Inc.), Canon RebelXT (Canon USA Inc.), Nikon Coolpix 8700 (Nikon Inc., Melville, NY), and Nikon D70s (Nikon Inc.) digital cameras in JPEG and TIFF formats. Three observers evaluated the images. The teeth were then observed under the microscope in polarized light for the verification of the presence and depth of the carious lesions.

Results: The probability of no diagnosis ranged from 1.34% (Insight film) to 52.83% (CanonScan/JPEG). The sensitivity ranged from 0.24 (Canon RebelXT/JPEG) to 0.53 (Insight film), the specificity ranged from 0.93 (Nikon Coolpix/JPEG, Canon Powershot/TIFF, Canon RebelXT/JPEG and TIFF) to 0.97 (CanonScan/TIFF and JPEG) and the accuracy ranged from 0.82 (Canon RebelXT/JPEG) to 0.91 (CanonScan/JPEG).

Conclusion: The carious lesion diagnosis did not change in either of the file formats (JPEG and TIFF) in which the images were saved for any of the equipment used. Only the CanonScan scanner did not have adequate performance in radiography digitalization for caries diagnosis and it is not recommended for this purpose.

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Figures

Figure 1
Figure 1
Example of a digital radiograph obtained
Figure 2
Figure 2
Distribution of faces as classified microscopically: (S) = no carious lesions on the proximal surface; (CE) = radiolucency restricted to the enamel without reaching the amelodentine junction; (CJ) = radiolucency strictly in the enamel, reaching the amelodentine junction; (CD) = radiolucency extended to the dentine
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