下顎骨の厚さとデンタルエックス線写真黒化度から求めた骨塩量の関係

抄録

Proper diagnosis and treatment planning are important for the placement of a dental implant. However, it seems to be impossible to evaluate the mandibular bone in a buccaLlingual direction by using conventional dental or panoramic radiography. We estimated that bone thickness was correlated with bone mineral content (BMC). Photodensitometric measurement of bone image on radiograph has been used widely as a quantitative indicator of BMC. The purpose of this study is to ascertain the relationship between the buccal-lingual thickness of mandibular bone and BMC by Photodensitometry using dental radiography.

The subject contrast of mandible was used as a parameter of BMC. The subjects were 41 adults (28 men and 13 women, aged 23-38 years with a mean of 26.7 years). BMC was evaluated by a densitometer on dental X-ray films of mandibular bone with a 0.2mm copper plate reference.Trabecular bone and cortical bone thickness in a buccal-lingual direction were measured on the occlusal radiograph using a digital caliper.

There were significant negative correlations between trabecular bone thickness and the sublect contrast of bone (r=-0.4338, p<0.01), and between cortical bone thickness and the sublect contrast of bone (r=-0.3187, p<0.05). These results suggest it is possible to estimate mandibular bone thickness by calculating the subject contrast of mandible using dental radiography.