抄録
For imaging diagnosis in osseointegrated dental implant treatment, cross-sectional images in the bucco-lingual direction, obtained by conventional X-ray tomography or computed tomography (CT), are necessary. Recently, new compact CT systems have been developed and will likely be used in dental implant treatment.
This study investigated the accuracy of mandibular representation of compact CT for dental use using mandibular measurement and image subtraction, and the influences of changing the threshold to obtain the binary image and size of the region of interest (ROI) were evaluated.
Two semi-lateral dried mandibles were used in this study. Images of the mandibular interdental alveolar bone in the premolar and molar regions were obtained using a compact CT system, 3DX (Morita Co., Japan) and a micro-CT unit (SMX-130CT, Shimadzu Co., Japan). The representations of mandible and trabecular bone patterns constructed from compact CT images were compared with those of mic-CT images.
The results were as follows
The mean difference of mandibular length between compact CT images and micro-CT images was 0.23 mm. The mean agreement rate was 73.8%, and the correlation coefficient of the rate of trabecular bone was 0.920 between the images by compact CT and micro CT, when the threshold of two-value images in compact images was set at the value of 60% and ROIs were set at half the size of those in cancelous bone.
In conclusion, the accuracy of mandibular representation in compact CT was high.
