3차원 광학 스캐너와 콘빔CT에서 생성된 디지털 모형의 비교
Comparison of digital models generated from three-dimensional optical scanner and cone beam computed tomography
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목적: 본 연구에서는 실제 환자의 석고모형의 콘빔CT (Cone Beam Computed Tomography)이미지로 디지털 모델을 제작하고 이 디지털 모델을 동일한 석고모형을 3차원 광학 스캐너로 스캔 하여 얻은 디지털 모델과 비교하였다. 연구 재료 및 방법: 총 11쌍의 석고모형에 대하여 실험을 진행 하였다. 콘빔CT를 이용하여 CT 영상을 촬영하여 디지털 모델을 제작 하였고 3차원 광학 스캐너를 사용해 대조군이 되는 디지털 모델을 제작하였다. 이를 이용해 각 석고모형에 대하여 콘빔CT와 3차원 광학 스캐너를 이용하여 만든 디지털 모델을 한 쌍으로 묶어 상, 하악 11개의 비교 쌍을 구성하고 각 쌍에 대하여 차이점을 분석하였다. 결과: 대조군과 비교 시 콘빔CT 영상으로부터 구성된 디지털 모델이 대조군 보다 과다 추정된 부분인 양의 오차의 평균은 0.059 - 0.117 mm, 과소 추정된 부분인 음의 오차의 평균은 0.066 - 0.146 mm의 범위 내에 존재했다. 또한 유의수준 0.05에서 양의 오차의 평균은 70 - 100 μm, 음의 오차의 평균은 100 - 120 μm 내에 존재 함을 확인하였다. 결론: 석고모형의 콘빔CT 영상으로부터 구성된 디지털 모델은 최종 수복물 제작에는 부적합하나 임시수복물 제작 및 교정 진단 과정에 활용될 수 있는 가능성이 있다.
Abstract
Purpose: The objective of this study was to compare the accuracy of digital models from 3 dimentional (3D) optical scanner and cone beam computed tomography (CBCT). Materials and Methods: We obtained digital models from 11 pairs of stone casts using a 3D optical scanner and a CBCT, and compared the accuracy of the models. Results: The error range of average positive distance was 0.059 - 0.117 mm and negative distance was 0.066 - 0.146 mm. Statistically (P < 0.05), average positive distance was larger than 70 μm and shorter than 100 μm, and that of negative distance was larger than 100 μm and shorter than 120 μm. Conclusion: We concluded that the accuracy of digital models generated from CBCT is not appropriate to make final prostheses. However, it may be acceptable for provisional restorations and orthodontic diagnoses with respect to the accuracy of the digitalization. (J Dent Rehabil Appl Sci 2016;32(1):60-9)
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