歯槽骨X線像における濃度特性の定量的把握に関する実験的研究

(第2編) 歯槽骨X線像の濃度分布特性について

抄録

Objective analysis of the radiographic characteristics of the alveolar bone is critical in prosthodontic treatment. The author investigated basic items on the classification of the radiographic image of the alveolar bones based on the quantitative analysis and on the calibration system on many films for the observation of their clinical course after the treatment.
In a number of cases of the radiographs of lower alveolar ridge, density distribution was analyzed for quantitative classification with emphasis placed on the internal structure of the alveolar bone, and the density distribution of the periodontal alveolar area was also analyzed quantitatively.
Results and Conclusions
1) The several linear analytical value in the particular area must be required to classify the radiographic image of the alveolar bone because of the marked differences of linear analytical value in the narrow area on the radiographic image of the alveolar bone.
2) The lamina dura in the tooth neighboring the edentulous area was wider than the one on the counter side of it and the one of abutment tooth for a fixed bridge.
3) The width of the periodontal space was almost the same because of small individual variations and less influence by the presence or absence of the adjacent tooth. The average of the width for all the cases showed 0.23±0.08mm.
4) Density in the area corresponding to the lamina dura and the periodontal space which were calibrated in a step wedge equivalent markedly varied between individuals and between areas.