Borg E, Källqvist A, Gröndahl K, Gröndahl H G
Department of Oral Diagnostic Radiology, Faculty of Odontology, Göteborg University, Sweden.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 1998 Jul;86(1):110-4. doi: 10.1016/s1079-2104(98)90159-7.
The purpose of this study was to evaluate observers' ability to detect simulated root resorption cavities in conventional radiographs and digital radiographs from a charge-coupled device system and a storage phosphor system and to determine whether the detectability was influenced by resorption size and exposure.
In teeth from dry mandibular jaw specimens, resorptive defects 1.2 mm in diameter and two different depths (0.6 and 0.9 mm) were prepared in the buccal root surface. Each tooth was radiographed at a number of different exposure settings. Observers were asked to rate their confidence that a resorption was or was not present using a five-graded confidence scale. Receiver operating characteristic analysis was used to evaluate the results.
Given optimal exposures, all systems reached what might be considered clinically acceptable Az values (> 0.75). The storage phosphor system reached this value at considerably lower exposures than those required for both the film and charge-coupled device systems. There was a tendency to better detect the deeper lesions and to identify them at lower exposures.
本研究旨在评估观察者在传统X线片以及来自电荷耦合器件系统和存储磷光体系统的数字X线片中检测模拟牙根吸收腔的能力，并确定可检测性是否受吸收大小和曝光的影响。
在干燥的下颌骨标本的牙齿上，在颊根表面制备直径为1.2mm且有两种不同深度（0.6mm和0.9mm）的吸收性缺损。每颗牙齿在多个不同的曝光设置下进行X线摄影。要求观察者使用五级置信度量表对他们认为存在或不存在吸收的置信度进行评分。采用受试者操作特征分析来评估结果。
在最佳曝光条件下，所有系统均达到了可被认为临床上可接受的Az值（>0.75）。存储磷光体系统在比胶片和电荷耦合器件系统所需曝光低得多的情况下达到了该值。有更好地检测较深病变并在较低曝光下识别它们的趋势。
