Dentomaxillofacial Radiology, Vol 28, Issue 1 31-36, Copyright © 1999 by British Institute of Radiology

ARTICLES

Comparison of observer reliability in assessing alveolar bone changes from color-coded with subtraction radiographs

X. Q. Shi, I. Eklund, G. Tronje, U. Welander, H. C. Stamatakis, P. E. Engstrom and G. N. Engstrom
Department of Oral Radiology, Karolinska Institutet, Stockholm, Sweden.

OBJECTIVES: To assess intra- and interobserver agreement on marginal changes in periodontal bone from color-coded compared with subtraction radiographs. METHODS: Sequential radiographs from patients undergoing periodontal treatment were acquired using direct digital intra-oral radiography. Fifty-one pairs of color-coded and subtraction radiographs were produced and evaluated twice by six dentists for changes in marginal bone. Intra- and interobserver agreement were calculated. RESULTS: Intra-observer agreement was significantly higher for the color-coded radiographs (P < 0.05). Interobserver agreement was significantly higher for color-coded radiographs at the second (P < 0.001) but not the first (P = 0.34) evaluation. CONCLUSIONS: Color coding of radiographic differences by means of image addition may be a feasible alternative to the subtraction technique for evaluating periodontal bone changes.

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