Department of Oral Diagnosis & Radiology, Ege University, Izmir, Turkey.
Dentomaxillofac Radiol. 2009 Oct;38(7):458-64. doi: 10.1259/dmfr/15206149.
Our aim was to compare the Accu-I-Tomo (3DX), the Digora Optime image plate system and F-speed film in detecting chemically created apical lesions.
Lesions were created by applying perchloric acid apical to extracted teeth in jaw specimens for 1, 1.5 or 2 h. After being repositioned, teeth were radiographed with Accu-I-Tomo limited cone beam CT (LCBCT), Digora Optime storage phosphor plates (SPP) and F-speed films. Six observers scored the presence of lesions using a five-grade scale. The accuracy of each observer and modality was assessed through receiver operating characteristic (ROC) analysis and A(z) values were compared using two-way ANOVA. Pairwise comparisons of imaging systems were carried out using the Mann-Whitney U-test. Differences in A(z) values were compared using Friedman and Dunn's tests. Kappa (kappa) was used to measure interobserver agreement.
The A(z) values were larger for LCBCT than for SPP and film for all acid durations. For 1 h of acid duration a significant difference was found between LCBCT and film (P = 0.02) and between LCBCT and SPP (P = 0.0043), For 1.5 h a significant difference (P = 0.006) was found between LCBCT and SPP only. For 2 h acid duration, there was no significant difference between LCBCT and film or SPP (P>0.05). Between SPP and film no significant difference was found for any acid duration (P>0.05). kappa ranged between fair and moderate for LCBCT and between slight and fair for SPP and film.
LCBCT images provided better than or similar detectability as film and SPP images of chemically created periapical lesions.
本研究旨在比较 Accu-I-Tomo（3DX）、Digora Optime 影像板系统和 F 速度胶片在检测化学诱导根尖病变中的表现。
将高氯酸应用于颌骨标本中离体牙的根尖 1、1.5 或 2 小时，以此来诱导产生病变。重新定位后，使用 Accu-I-Tomo 有限角锥形束 CT（LCBCT）、Digora Optime 存储磷屏（SPP）和 F 速度胶片对牙齿进行拍摄。6 位观察者使用五级评分标准对病变的存在进行评分。通过受试者工作特征（ROC）分析评估每位观察者和每种模式的准确性，并使用双向 ANOVA 比较 A（z）值。使用 Mann-Whitney U 检验进行成像系统之间的两两比较。使用 Friedman 和 Dunn 的检验比较 A（z）值的差异。Kappa（kappa）用于衡量观察者间的一致性。
对于所有酸处理时间，LCBCT 的 A（z）值均大于 SPP 和胶片。对于 1 小时酸处理时间，LCBCT 与胶片（P=0.02）和 LCBCT 与 SPP（P=0.0043）之间存在显著差异，对于 1.5 小时酸处理时间，仅在 LCBCT 与 SPP 之间存在显著差异（P=0.006）。对于 2 小时酸处理时间，LCBCT 与胶片或 SPP 之间无显著差异（P>0.05）。对于任何酸处理时间，SPP 与胶片之间均无显著差异（P>0.05）。LCBCT 的 kappa 值为中等至良好，SPP 和胶片的 kappa 值为轻度至中等。
LCBCT 图像对化学诱导根尖病变的检测能力优于或与胶片和 SPP 图像相当。
