| Autor: |
Furukawa, Mikiko, Izumi, Masahiro, Hishikawa, Toshimitsu, Noguchi, Toshihide, Ariji, Eiichiro |
| Předmět: |
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| Zdroj: |
Oral Radiology; Dec2005, Vol. 21 Issue 2, p69-73, 5p, 5 Diagrams, 1 Chart |
| Abstrakt: |
Objectives. The purpose of this study was to estimate the influence of overlying soft tissue on mandible bone density measurements made using radiographic absorptiometry with an aluminum (Al) reference wedge. Methods. Buccal soft tissue thickness was measured in five women at four vertical levels on reconstructed computed tomography images. Calibration curves for Al-equivalent thickness (Al-eq) values versus gray levels of radiographs for various thicknesses of soft tissue-equivalent material were obtained experimentally. The inaccuracy of Al-eq values was calculated as the difference between the Al-eq value of the reference area and that of the measurement area. Results. Soft tissue thicknesses varied horizontally and vertically according to the measurement site. In the alveolar area, where overlying soft tissue was 12 or 15 mm thick, the inaccuracy of the estimated bone density was approximately 0.6 or 1.0 mm, respectively. Conclusion. Differences in soft tissue thickness should not be ignored during intraoral radiographic absorptiometry. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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