Use of an internal standard in subtraction radiography to assess initial periodontal bone changes

Dento Maxillo Facial Radiology
G S GriffithsJ A Sterne

Abstract

To assess the use of an internal reference when performing histogram analyses in digital subtraction images and to determine the ability of the method to detect initial bone lesions. Fifty-one Royal Air Force recruits had standardized vertical bitewing radiographs and clinical assessment of attachment level recorded annually over three years. Subtraction analyses of crestal bone changes at the mesial surface of the upper right first molar were compared with changes at the mesial surface of the same tooth. Changes over the periods from age 17 to 18 years and age 18 to 20 years were monitored using two subtraction procedures. Reproducibility studies revealed that Pearson correlations between duplicate measurements of the test site alone (16 crest; r = 0.74) were lower than those between duplicate measurements of changes where misalignment was controlled for, either as a difference (16 crest-16 tooth; r = 0.93) or ratio (16 crest/16 tooth; r = 0.93). We used the differences between the mean subtraction density for 16 crest and 16 tooth as our measure of change in bone density. For the duplicate measurements, the standard deviation of these differences was 3.9: a difference of +/- 7.8 was therefore taken as a threshold value for ev...Continue Reading

References

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Citations

Jun 14, 2006·Clinical Oral Investigations·Frank Du TréDaniel van Steenberghe
Jul 18, 2001·Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics·E O DelanoM Trope
Oct 8, 1998·Journal of Clinical Periodontology·I FourmousisU Brägger
Sep 2, 2005·Periodontology 2000·Urs Brägger
Sep 6, 2008·Journal of Periodontology·Maria Cecília F AzoubelGerly Anne C Brito
Jun 1, 1997·Journal of Clinical Periodontology·J S ZametH N Newman

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