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KMID : 0376319930050010277
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Dental Journal of CNU
1993 Volume.5 No. 1 p.277 ~ p.287
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AN ASSESSMENT OF THE SHORT-TERM EFFECT OF PERIODONTAL FLAP SURGERY BY DIGITAL SUBTRACTION RADIOGRAPHY
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Jin Yoo-Nam
Chung Hyun-Ju
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Abstract
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Since Gro¨ndahl et al introduced a digital subtraction radiography into periodontal diagnosis in 1983, many reports using this system has aimed to assess the periodontal disease activity and the alveolar bone changes after periodontal treatment.
The present study was performed to evaluate the usefulness of digital subtraction radiography for assessing an alveolar bone changes in 3 months after periodontal flap surgery. Serial intraoral radiographs were taken from 5 normal subjects and 6 periodontally diseased patients using customized bite blocks attached to film holder in fixation device and digitized by image processing system(consisting of IBM 386, digital frame grabber, CCD camera. Image-pro Ⅱ software). And the reference parameters were measured by pixel unit and compared with respective radiographs. The serial radiographs showed a little and statistically insignificant difference in reference parameters.
The conventional intraoral radiographs, the subtraction images and the color enhanced subtraction images were reviewed by 4 examiners and the examiner’s agreement rates were compared. The subtraction images and its color enhanced images showed higher examiner’s agreement rates than the conventional radiographs. And the proportions of sites diagnosed with bone loss or gain after periodontal surgery were higher in the subtraction images and its color enhanced images than in the conventional radiographs. Especially, in color enhanced images, the number of bone gain sites tended to increase according to post-surgery periods.
These results indicate that projection geometry could be standardized with the device used in this study, and the subtraction radiography may be useful to assess an alveolar bone changes after periodontal flap surgery.
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