CAJ | 학술논문

目的：比较传统全景片和锥形束CT（CBCT）重建全景片用于测量牙轴近远中倾斜度的准确性。方法收集15名个别正常志愿者的石膏模型，在模型上确定上下颌从左侧第一磨牙到右侧第一磨牙的牙体长轴和平面的标记点，制作放射显影装置，志愿者佩戴放射显影装置拍摄全景片和CBCT片。分别在石膏模型、全景片和CBCT重建全景片上测量牙轴近远中倾斜度。利用多元方差分析和Dunnett-t检验比较3种测量方法的差异。结果3种测量方法间的差异有统计学意义（P=0.00）。与模型测量相比，全景片组中12个牙位有2个牙位（上下颌第二前磨牙）测量结果的差异有统计学意义（P=0.00），CBCT组12个牙位的差异均无统计学意义。结论评价牙轴近远中倾斜度时，传统全景片存在一定误差，CBCT重建全景片是一种更为有效的评价手段。
목적：비교전통전경편화추형속CT（CBCT）중건전경편용우측량아축근원중경사도적준학성。방법수집15명개별정상지원자적석고모형，재모형상학정상하합종좌측제일마아도우측제일마아적아체장축화평면적표기점，제작방사현영장치，지원자패대방사현영장치박섭전경편화CBCT편。분별재석고모형、전경편화CBCT중건전경편상측량아축근원중경사도。이용다원방차분석화Dunnett-t검험비교3충측량방법적차이。결과3충측량방법간적차이유통계학의의（P=0.00）。여모형측량상비，전경편조중12개아위유2개아위（상하합제이전마아）측량결과적차이유통계학의의（P=0.00），CBCT조12개아위적차이균무통계학의의。결론평개아축근원중경사도시，전통전경편존재일정오차，CBCT중건전경편시일충경위유효적평개수단。
Objective To compare the accuracy of mesiodistal tooth angulation measurements by using traditional panoramic radiographs and cone beam CT (CBCT) panoramic images. Methods Plaster models of 15 volunteers with individual normal occlusions were collected. The functional occlusal plane and tooth long axis on the plaster models were marked from the right first molar to the left first molar in the upper and lower dental arches. A radiographic stent, which contains radiopaque markers near the functional occlusal plane and approximating the root axis, was fabricated for each model. Traditional panoramic radiographs and CBCT scan images were obtained from each patient, with the radiographic stent seated on the dentition. A panoramic image reconstruction was made from the CBCT volumetric data by using related software. The CBCT panoramic image data were oriented parallel to the maxillary or mandibular functional occlusal plane containing all the radiopaque markers when measuring the maxillary or mandibular teeth, respectively. The mesiodistal tooth angulations of the plaster model, traditional panoramic radiographs, and CBCT panoramic images were measured and compared. Multivariate analysis of variance and Dunnett-t test were performed to compare the differences among the three methods. Results The difference among the three methods was statistically significant (P=0.00). Significant differences compared with the model measurement were found in two teeth (upper second premolar and lower second premolar) among twelve teeth (P=0.00) in traditional panoramic measurement. CBCT panoramic measurement was not significantly different to model measurement. Conclusion Traditional panoramic radiographs do not provide a more reliable measure of mesiodistal tooth angulation, whereas CBCT panoramic image is an effective tool for evaluating mesiodistal tooth angulation.