Gülhane Military Medical Academy, Dental Science Centre, Oral Diagnosis and Radiology Department, Ankara, Turkey.
Dentomaxillofac Radiol. 2010 Feb;39(2):95-9. doi: 10.1259/dmfr/85088069.
The aim was to assess the accuracy and reproducibility of measurements of chemically created periapical lesions using limited cone beam CT.
Periapical lesions were chemically created in 18 mandibular cadaver teeth. Mandibles were dissected buccolingually using a bone-cutting burr. Diameters and depths were measured directly in the cross-sectional slices using a precision digital caliper. The cross-sectional slices were then embedded in wax, and cone beam CT images were acquired using a NewTom 3G Plus scanner with both 6 inch and 9 inch fields of view (FOVs). Two oral radiologists measured the diameter and depth of periapical lesions on the cross-sectional images using the built-in measurement tools. Measurements were repeated after a 1 week interval. Inter- and intraobserver agreement was calculated by ANOVA. Regression analysis was used to test the correlation between the cone beam CT and digital caliper measurements.
No significant differences were found in diameter or depth measurements between or within observers or between 6 inch and 9 inch FOV images. Regression analysis of diameter and depth measurements made by direct caliper versus 6 inch or 9 inch FOV images revealed a high regression coefficient (for diameter: 6 inch FOV, R(2) = 94.6%; 9 inch FOV, R(2) = 94.8%; P<0.001; for depth: 6 inch FOV, R(2) = 99.3%; 9 inch FOV, R(2) = 99.3%; P<0.001) showing a strong linear relationship. For the diameter, the mean deviation from direct caliper measurements was 0.0625 mm and 0.08958 mm, respectively; for the 6 inch FOV and 9 inch FOV images, and for depth, the mean deviation was, respectively, -0.1001 mm and 0.09875 mm.
Cone beam CT yielded highly accurate and reproducible results in the quantitative assessment of periapical lesions.
评估使用有限锥形束 CT 对化学诱导根尖病变进行测量的准确性和可重复性。
在 18 颗下颌离体牙中诱导根尖病变。使用骨切割磨头从颊舌方向将下颌骨劈开。在横截面上直接使用精密数字卡尺测量直径和深度。然后将横截面切片嵌入蜡中，并使用 NewTom 3G Plus 扫描仪采集锥形束 CT 图像，视野（FOV）分别为 6 英寸和 9 英寸。两名口腔放射科医生使用内置的测量工具在横截面上测量根尖病变的直径和深度。一周后重复测量。使用方差分析评估观察者间和观察者内的一致性。使用回归分析检验锥形束 CT 和数字卡尺测量值之间的相关性。
在观察者之间或观察者内部，或在 6 英寸和 9 英寸 FOV 图像之间，直径或深度测量值均无显著差异。直接卡尺测量值与 6 英寸或 9 英寸 FOV 图像的直径和深度测量值的回归分析显示出较高的回归系数（直径：6 英寸 FOV，R²=94.6%；9 英寸 FOV，R²=94.8%；P<0.001；深度：6 英寸 FOV，R²=99.3%；9 英寸 FOV，R²=99.3%；P<0.001），表明存在很强的线性关系。对于直径，直接卡尺测量值的平均偏差分别为 0.0625 毫米和 0.08958 毫米；对于 6 英寸 FOV 和 9 英寸 FOV 图像，对于深度，平均偏差分别为-0.1001 毫米和 0.09875 毫米。
锥形束 CT 对根尖病变的定量评估具有高度准确性和可重复性。
