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KMID : 0376319940060010317
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Dental Journal of CNU
1994 Volume.6 No. 1 p.317 ~ p.326
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Quantitative analysis of the alveolar bone change by the digital subtraction radiography
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Abstract
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Various efforts have been made to assess the subtle alveolar bone changes and digital subtraction radiography has been reported to be the best method in evaluating it qualitatively and quantitatively.
The present study was performed to estimate the detectable alveolar bone change quantitatively by using digital subtraction radiography.
For the in vitro study, intraoral standard radiography were taken from porcine mandible. A rectangular cortical bone chip with the thickness of 0.1 mm to 1.0mm thickness having a 0.1mm increment was attached on the buccal surface. The radiographs
with
bone plates and without were reviewed at the same time by 10 observers and asked to detect the presence of the cortical bone plates. The radiographs without bone plates were subtracted from the radiograph with bone plates by using the image
processing
system (digital converter-256 grey-levels. DT 2851. Data Translation Co., U.S.A. ; 386 ; CCD camera. FOTOVIX. Tamrom Co., Japan). The subtraction images were reviewed subsequently by same observers. The detectable thickness of the cortical bone
plate
was 0.4mm on the intraoral radiograph and 0.2mm on the subtaction images.
For the human study. Radiographs were taken from patients by using a intraoral film holding device and a aluminium reference wedge before treatment and 3 months after bone grafting and 1 week after osteoplasty. The grey level change was estimated
in the
subtraction images and converted to the thickness of aluminium. The amount of alveolar bone change was 1.87mm aluminium thickness equivalent in the grafted sites and -1.49mm aluminium thickness equivalent in the osteoplaty stites.
In conclusion. The digital subtraction radiography was more effective in detecting a subtle change of the alveolar bone than the intraoral radiography. The quantitative analysis of the digital subtraction radiography can be aid in the estimation
of
the
alveolar bone resorption or apposition during diagnosis and treatment of periodontally diseased patients.
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