CBCT-재구성 파노라마영상의 근원심 치축에 관한 연구
Evaluation of mesiodistal tooth axis using a CBCT-generated panoramic view
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초록
본 연구에서는 cone beam computed tomography (CBCT)를 이용한 삼차원 영상을 기준으로 CBCT-재구성 파노라마영상 형성 시의 신뢰성을 입증하고 CBCT 삼차원 영상과 비교하여 실제 근원심 치축을 가장 잘 나타낼 수 있는 이차원 파노라마영상을 찾고자 하였다. 연구 모형은 두부계측방사선사진의 평균치에 따라 제작되었고 CBCT와 파노라마방사선영상 촬영을 위해 촬영 시마다 연구 모형이 반복적으로 재위치되었다. 파노라마방사선영상은 －5˚, 0˚, ＋5˚로 연구 모형의 교합평면을 변화시키면서 촬영되었다. 이후 CBCT 삼차원 영상과 CBCT-재구성 파노라마영상 및 파노라마방사선영상에서 측정된 계측값을 평가하였다. CBCT 삼차원 영상과 CBCT-재구성 파노라마영상의 전치 및 견치부에서 통계학적으로 유의성 있는 차이를 나타내지 않았으나 대부분의 소구치부에서는 통계학적으로 유의성 있는 차이를 나타내었다. 그리고 CBCT-재구성 파노라마영상과 파노라마방사선영상은 대부분의 치아에서 통계학적으로 유의성 있는 차이를 나타내었다. CBCT-재구성 파노라마영상이 근원심 치축 평가 시 임상적으로 사용 가능함을 보여주었다.
Abstract
Objective: The purpose of this study was to confirm the reliability of a cone beam computed tomography (CBCT)-generated panoramic view based on a CBCT 3D image and to find the most helpful 2D panoramic image compared with CBCT 3D image when examining the mesiodistal tooth axis. Methods: A test model was constructed according to cephalometric norms. The test model was repeatedly repositioned for CBCT and panoramic radiographic imaging. Panoramic radiographs were acquired at each of the following 3 occlusal plane positions: －5˚, 0˚, and ＋5˚. Measurements of mesiodistal tooth axis in CBCT 3D image, CBCT-generated panoramic view, and panoramic radiographs were compared. Results: Compared with the CBCT-generated panoramic view, CBCT 3D image showed significant difference in the mesiodistal tooth axis in the premolars and no significant difference in the mesiodistal tooth axis in the incisors and canines. Mesiodistal tooth axis on the CBCT-generated panoramic view was significantly different from that on panoramic radiographs. Conclusions: CBCT-generated panoramic view can be a useful tool for evaluating mesiodistal tooth axis.
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