Assessing the diagnostic accuracy of filtered digital panoramic radiographs in detecting interproximal caries

Panoramic images can be obtained using film-based conventional techniques and digital imaging systems. Compared with conventional film-based techniques, digital panoramic imaging systems have some advantages such as dose reduction, image manipulation, saving time and elimination of the need for toxic processing chemicals. The aim of this study was to investigate the diagnostic accuracy of filtered digital panoramic radiographs for assessment of interproximal caries in comparison to bitewing radiography. In this descriptive/analytical study 608 interproximal surfaces, from the mesial surface of the first premolar to the distal surface of the second molar, were evaluated on filtered digital panoramic radiographs and conventional bitewing radiographs for interproximal caries by two oral and maxillofacial radiologists. Data were analyzed by SPSS 11.5 using kappa and Wilcoxon statistical analyses and calculation of reliability coefficient and Spearman’s correlation coefficient at 95% significance level. There were statistically significant differences in frequency distribution of caries between the two techniques (p value = 0.002) and also between frequency distribution of diagnostic agreement between these two techniques (p value < 0.001(. According to the results of this study, the diagnostic accuracy of filtered digital panoramic radiography is significantly lower than that of conventional bitewing radiography for detection of interproximal caries.