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Digital image ratio: a new radiographic method for quantifying changes in alveolar bone. Part II: Clinical
1Département de Parodontologie, Faculté de Chirurgie Dentaire, Université Paris, France.
Journal of Periodontal Research
|November 1, 1996
Summary
Digital Image Ratio (DIR) analysis effectively quantifies bone density changes after periodontal therapy. DIR shows significant bone regeneration in graft sites, proving its clinical utility for assessing bone changes.
Area of Science:
- Periodontology
- Radiology
- Biomaterials
Background:
- Quantitative digital subtraction radiography has limitations.
- Digital Image Ratio (DIR) offers a theoretical improvement.
- DIR enables direct computation and visualization of bone mass changes.
Purpose of the Study:
- To evaluate the clinical application of DIR analysis.
- To assess bone changes in patients undergoing regenerative periodontal therapy.
- To compare bone graft substitutes with debridement alone.
Main Methods:
- DIR analysis was applied to 20 periodontal sites in 8 patients.
- Standardized radiographs were taken pre- and post-surgery (12 months).
- Ten sites received bone graft substitutes (coral-based), and 10 served as controls (debridement).
Main Results:
- Experimental sites showed an 18% mean increase in bone density (ratio 1.18).
- Sites with natural coral alone demonstrated a 23% increase (ratio 1.23).
- Control sites remained stable (ratio 1.00 ± 0.07), with 3 showing bone loss.
Conclusions:
- DIR analysis is suitable for clinical applications in periodontology.
- The technique allows for quantitative comparison of bone changes between treated and control sites.
- DIR effectively visualizes and quantifies bone regeneration following periodontal therapy.