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Dentomaxillofacial Radiology (2007) 36, 138-142
© 2007 British Institute of Radiology
doi: 10.1259/dmfr/15558921

RESEARCH

In vitro comparison of conventional film and direct digital imaging in the detection of approximal caries

VM Castro*,1, JO Katz2, PK Hardman2, AG Glaros3 and P Spencer1

1 Department of Oral Biology, School of Dentistry, University of Missouri – Kansas City, MO, USA; 2 Department of Oral Pathology, Radiology and Medicine, School of Dentistry, University of Missouri – Kansas City, MO, USA; 3 Kansas City University of Medicine and Biosciences, Kansas City, MO, USA

*Correspondence to: Vania Machado Castro, Department of Oral Biology, University of Missouri – Kansas City, School of Dentistry, 650 E. 25th Street, Kansas City, MO 64108-2784, USA; Email: castrov{at}umkc.edu

Received 8 July 2005; revised 5 April 2006; accepted 25 April 2006

Objectives: To compare the diagnostic accuracy of conventional film, unenhanced direct digital and inversion grayscale direct digital imaging in the detection of approximal caries.

Methods: 150 approximal surfaces of extracted permanent molars and premolars were selected for the study on the basis of varying lesion depth. The teeth were radiographed using Ektaspeed Plus film; digital images were made with a Schick CMOS-APS sensor. 7 examiners evaluated 58 randomized images of each modality. Histological sectioning of the teeth was used to verify the presence and extent of decay.

Results: No significant difference was found between the diagnostic accuracies of the three imaging modalities (P=0.226). Analysis of the diagnostic accuracy of the three modalities on lesion depth showed no statistically significant interaction; however, the main effect of the lesion depth was significant (P<0.001, {eta}2=0.936).

Conclusions: The overall diagnostic accuracy of the three modalities in the detection of approximal carious lesions was comparable. All three modalities performed poorly in the detection of enamel lesions.

Keywords: digital radiography; image processing; carious lesions; radiography






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