Department of Oral Diagnosis and Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Int Endod J. 2010 Sep;43(9):798-807. doi: 10.1111/j.1365-2591.2010.01749.x. Epub 2010 Jul 1.
To assess ex vivo the use of two different cone-beam computerized tomography (CBCT) units at different voxel resolutions for the detection of simulated small internal resorption cavities.
A total of 60 single-rooted mandibular incisors and canines were split mesiodistally along the coronal plane into labial and lingual sections. Artificial internal root resorption was simulated by drilling with a 0.5-mm-diameter round bur to its full depth at either the cervical or apical portion of the labial wall. In total, 60 cavities were created (30 cervical and 30 apical), and 60 locations (30 cervical and 30 apical) were left without cavities. The sections were rejoined and placed in dry human mandibles in groups of 6 and imaged using two different CBCT units at different resolutions to obtain five image sets as follows: Iluma, ultra-resolution (0.1 mm(3)); Iluma, high-resolution (0.2 mm(3)); Iluma, low-resolution (0.3 mm(3)); 3D Accuitomo 170, 6 x 6 cm FOV (0.125 mm(3)); 3D Accuitomo 170, 8 x 8 cm FOV (0.160 mm(3)). Each image set was viewed by two observers and evaluated using a 5-point scale for detection of internal resorption cavities. Kappa coefficients were calculated to assess intra- and inter-observer agreement. Az values were calculated and compared, with a significance level of alpha = 0.05.
Kappa values were fair-to-moderate for the low-resolution Iluma images and good to excellent for all other image sets. Both intra- and inter-observer agreement values were higher for the Accuitomo images than for the Iluma images. The highest Az values were obtained with the Accuitomo 0.125 mm(3) images and the lowest with the Iluma 0.3 mm(3) images. The Az values for the Accuitomo and Iluma ultra- and high-resolution images were higher than those of the low-resolution Iluma images. No differences (P > 0.05) for internal resorption detection were found between the Az values of the Accuitomo 0.125 mm(3), Accuitomo 0.160 mm(3), ultra-resolution Iluma and high-resolution Iluma images.
Ultra-and high-resolution Iluma and Accuitomo 0.125 and 0.160 mm(3) CBCT images performed similarly and better than low-resolution Iluma images in the detection of simulated internal resorption ex vivo.
评估两种不同锥形束计算机断层扫描（CBCT）设备在不同体素分辨率下用于检测模拟的小内部吸收腔的效果。
将 60 颗下颌切牙和尖牙沿冠向平面沿近远中方向劈开为唇侧和舌侧部分。用 0.5 毫米直径的圆钻在唇壁的颈段或根尖部钻透至全长，模拟人工根管内吸收。总共创建了 60 个腔（30 个颈段和 30 个根尖段），60 个位置（30 个颈段和 30 个根尖段）没有腔。将部分重新连接，并将其放入干燥的人类下颌骨中，每组 6 个，并使用两种不同的 CBCT 设备以不同的分辨率进行成像，以获得以下五个图像集：Iluma，超高分辨率（0.1mm(3)）；Iluma，高分辨率（0.2mm(3)）；Iluma，低分辨率（0.3mm(3)）；3D Accuitomo 170，6x6cm FOV（0.125mm(3)）；3D Accuitomo 170，8x8cm FOV（0.160mm(3)）。每个图像集均由两名观察者观看，并使用 5 分制对内部吸收腔的检测进行评估。计算kappa 系数以评估内部和观察者之间的一致性。计算 Az 值并进行比较，显著性水平为 alpha = 0.05。
低分辨率 Iluma 图像的kappa 值为适度到中度，而所有其他图像集的kappa 值为良好到优秀。Accuitomo 图像的观察者内和观察者间的一致性值均高于 Iluma 图像。Az 值最高的是 Accuitomo 0.125mm(3)图像，最低的是 Iluma 0.3mm(3)图像。Accuitomo 和 Iluma 超高分辨率和高分辨率图像的 Az 值高于低分辨率 Iluma 图像的 Az 值。Accuitomo 0.125mm(3)、Accuitomo 0.160mm(3)、超高分辨率 Iluma 和高分辨率 Iluma 图像的 Az 值之间没有差异（P > 0.05）。
在体外检测模拟的内部吸收方面，超高分辨率和高分辨率 Iluma 以及 Accuitomo 0.125 和 0.160mm(3) CBCT 图像的性能与低分辨率 Iluma 图像相似，甚至优于低分辨率 Iluma 图像。
