Digital subtraction of radiograph in evaluating alveolar bone changes after initial periodontal therapy

Tomohiro Okano, Toyotsune Mera, Masafumi Ohki, Isao Ishikawa, Naoyuki Yamada

Research output: Contribution to journalArticle

28 Citations (Scopus)


The purpose of this study was to determine the effect of initial periodontal therapy on crestal bone remineralization with the use of a digital subtraction method for quantitative analysis. Fifteen crestal sites randomly selected from five patients were examined at the initial visit, after completion of oral hygiene instruction, and 1, 3, and 6 months after scaling and root planing with standardized radiographs. The radiographs were digitized by means of a drum-scanning microdensitometer with a sampling aperture of 50 μm producing 256 gray levels and corrected for difference of contrast between image pairs. Results were as follows: (1) statistically significant changes were observed even 1 month after the therapy and (2) the extent of changes was quantitatively expressed and monotonically increased with time. These results indicate that subtraction radiography may be a reproducible and quantitaive method for the evaluation of periodontal therapy.

Original languageEnglish
Pages (from-to)258-262
Number of pages5
JournalOral Surgery, Oral Medicine, Oral Pathology
Issue number2
Publication statusPublished - Jan 1 1990
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine
  • Dentistry(all)

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