Menezes Carolina Carmo, Janson Guilherme, da Silveira Massaro Camila, Cambiaghi Lucas, Garib Daniela Gamba
a Orthodontic Graduate Student, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, SP, Brazil.
b Professor, Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, SP, Brazil.
Angle Orthod. 2016 Jul;86(4):535-42. doi: 10.2319/040115-214.1. Epub 2015 Oct 21.
To evaluate the precision, reproducibility, and accuracy of alveolar crest level measurements on CBCT images obtained with different voxel sizes.
CBCT exams were made of 12 dried human mandibles with voxel dimensions of 0.2, 0.3, and 0.4 mm. Bone crest level was measured directly on the mandibles with a digital caliper and on CBCT images. Images were measured twice by two examiners. Intra- and interexaminer precision and reproducibility were assessed using paired and t-tests, respectively. Accuracy was evaluated using t-tests.
Precision and reproducibility of bone crest level tomographic measurements was good for all voxel sizes evaluated. The images with 0.2-mm voxel size showed a decreased number of intraexaminer errors. A high accuracy for measurements of bone crest level was observed for all CBCT definitions, except for the mandibular incisors using the 0.4-mm voxel size.
Precision and reproducibility of alveolar bone level measurements were good for various voxel sizes. CBCT images demonstrated good accuracy for 0.2-mm and 0.3-mm voxel sizes. The mandibular incisor region needs better resolution than that provided by 0.4-mm voxel size for bone crest level measurements.
评估在不同体素大小的锥形束计算机断层扫描（CBCT）图像上测量牙槽嵴水平的精度、可重复性和准确性。
对12具干燥的人类下颌骨进行CBCT检查，体素尺寸分别为0.2、0.3和0.4毫米。使用数字卡尺直接在颌骨上以及在CBCT图像上测量骨嵴水平。由两名检查者对图像进行两次测量。分别使用配对t检验和t检验评估检查者内和检查者间的精度与可重复性。使用t检验评估准确性。
对于所有评估的体素大小，骨嵴水平断层测量的精度和可重复性良好。体素大小为0.2毫米的图像显示检查者内误差数量减少。除了使用0.4毫米体素大小测量下颌切牙外，所有CBCT定义下骨嵴水平测量的准确性都很高。
对于各种体素大小，牙槽骨水平测量的精度和可重复性良好。CBCT图像对于0.2毫米和0.3毫米的体素大小显示出良好的准确性。在下颌切牙区域，对于骨嵴水平测量，需要比0.4毫米体素大小提供的分辨率更高的分辨率。
