석고 모형, 레이저 스캔 방식 디지털 모형, 콘 빔 CT 영상 간의 모형 분석 비교

Abstract

The purpose of this study was to evaluate the possibility of using digital model and CBCT image for model analysis. CBCT images, plaster models, digital models of 20 orthodontic patients with permanent dentition were used for comparison of model analysis measurements (tooth size, arch width, required space, available space, arch length discrepancy, Bolton tooth size discrepancy) The results were as follows. 1. Absolute deferences of repeated measurements of tooth size and dental arch width were 0.06 to 0.27 mm, 0.26 to 0.84 mm in plaster models, 0.01 to 0.20 mm, 0.25 to 0.63 mm in digital models and 0.15 to 0.26 mm, 0.34 to 0.49 mm in CBCT images. 2. The average differences of tooth size measurements between digital model and plaster model were 0.01 to 0.20 mm, and digital model showed significant differences in the 7 tooth sizes. 3. The average differences of tooth size measurements between CBCT image and plaster model were -0.22 to 0.01 mm, and CBCT image showed significant differences in the 5 tooth sizes. 4. The average differences of arch length discrepancy measurements between digital model and plaster model were below 0.82 mm, and the difference of Bolton discrepancy measurements was below 0.44 mm. There was no statistically significant difference. 5. The average differences of arch length discrepancy measurements between CBCT image and plaster model were below 0.43 mm, and there was no statistically significant difference. Overall Bolton discrepancy measurements was 1.25 mm smaller in the CBCT images and was statistically significant. In conclusion, although there were statistically significant differences in some model analysis measurements between digital model and plaster model, and between CBCT image and plaster model, the ranges of measurement errors were clinically acceptable. Therefore, digital model and CBCT image can be used for model analysis measurements.