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A COMPARISON OF PERIAPICAL RADIOGRAPHS AND THEIR DIGITAL IMAGES FOR THE DETECTION OF SIMULATED INTERPROXIMAL CARIOUS LESIONS

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Abstract

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À½°ú °°¾Ò´Ù.
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#ÃÊ·Ï#
The purpose of this study was to compare the diagnostic accuracy of periapical
radiographs and their digitized images for the detection of simulated interproximal
carious lesions. A total of 240 interproximal surfaces was used in this study. The case
sample was composed of 80 anterior teeth, 80 bicuspids and 80 molars which were
prepared in order to distribute the surfaces from carious free to those containing
simulated carious lesions of varying depths(0.5§®, 0.8§®, and 1.2§®). The periapical
radiographs were taken by paralleling technique and film used was Kodak Ektaspeed(E
group). All radiographs were evaluated by five dentist to recognize the true status of
simulated carious lesion. They were asked to give a score of 0, 1, 2, or 3. Digitized
images were obtained using a commercial video processor(FOTOVIX ¥±-XS). And the
computer system was 486 DX PC with PC Vision and frame grabber. The 17' display
monitor had a resolution of 1280¡¿1024 pixels(0.26 §® dot pitch). But the one frame of
the intraoral radiograph has a resolution of 700¡¿480 pixels and each pixel has a grey
level value of 256. All the radiographs and digital images were viewed under uniform
subdued lighting in the same reading room. After a week the second interpretation was
performed in the same condition.
The detection of lesions on the monitor was compared with the finding of simulated
interproximal carious lesions on the film images.
The results were as follows:
1. When the scoring criteria was dichotomous
; lesion present and not present
1) The overall sensitivity, specificity and diagnostic accuracy of periapical radiographs
and their digital images showed no statistically significant difference.
2) The sensitivity and specificity according to the region of teeth and the grade of
lesions showed no statistically significant difference between periapical radiographs and
their digital images.
2. When estimate the grade of lesions
; score 0, 1, 2, 3
1) The overall diagnostic accuracy was 53.3% on the intraoral films and 52.9% on
digital images. There was no significant difference.
2) The diagnostic accuracy according to the region of teeth showed no statistically
significant difference between periapical radiographs and their digital images.
3. The degree of agreement and reliability
1) Using gamma value to show the degree of agreement, there was similarity between
periapical films and digital images.
2) The reliability of each twice interpretation of periapical films and digital images
showed no statistically significant difference. In all cases P value was greater than 0.05,
showing that both techniques can be used to detect the incipient and moderate
interproximal carious lesions with similar accuracy.

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