Division of Oral Radiology, Department of Oral Diagnosis, State University of Campinas, Piracicaba, Brazil.
Division of Bioestatistcs, Department of Community Dentistry, Piracicaba Dental School, State University of Campinas, Piracicaba, Brazil.
Int Endod J. 2016 Apr;49(4):386-92. doi: 10.1111/iej.12466. Epub 2015 Jun 3.
To evaluate whether the type of display device affects the detection of vertical root fractures (VRFs) on digital radiographs in unfilled canals and canals with fibreglass posts.
Forty single-rooted human teeth were decoronated, and the root canals were prepared. The teeth were divided into 2 groups: controls (20 teeth) and with VRF (20 teeth). The VRFs were induced using an universal testing machine. Periapical radiographs of all teeth, with canal unfilled or with a fibreglass post, were obtained using the parallel technique in 3 directions (ortho-, mesio- and distoradial) on storage phosphor plates (VistaScan®). All images were evaluated and re-evaluated after 30 days by 3 examiners on a 5-point scale using 4 different devices (notebook display with full high definition resolution, desktop display with a standard resolution, 8-inch Android(™) tablet with high definition resolution and a 9.7-inch iPad® tablet with Retina resolution). Areas under ROC curves, sensitivity, specificity and accuracy values were compared by anova.
The weighted kappa values for intra- and interobserver reproducibility were 0.55-0.88 and 0.31-0.65, respectively. There was a significant difference (P < 0.05) in relation to the area under the ROC curve, specificity and sensitivity when unfilled canals were compared with canals with a fibreglass post; however, no difference was observed for the different devices studied.
The type of display device did not affect the detection of VRFs. Thus, the detection of VRFs can be performed using different screen sizes and resolutions.
评估显示设备的类型是否会影响未填充根管和纤维桩根管中垂直根折（VRF）的检出。
将 40 颗单根人牙截冠，预备根管。将牙齿分为两组：对照组（20 颗牙）和 VRF 组（20 颗牙）。使用万能试验机诱导 VRF。使用平行技术在 3 个方向（ortho、mesio 和 distoradial）在存储磷光板（VistaScan®）上获得所有牙齿的根尖片，包括未填充根管和纤维桩根管。所有图像均在 30 天后由 3 名检查者使用 4 种不同设备（全高清分辨率笔记本显示屏、标准分辨率台式显示屏、高清分辨率 8 英寸 Android（™）平板电脑和视网膜分辨率 9.7 英寸 iPad（®）平板电脑）在 5 分制上进行评估和重新评估。通过方差分析比较 ROC 曲线下面积、敏感性、特异性和准确性值。
观察者内和观察者间的加权 kappa 值分别为 0.55-0.88 和 0.31-0.65。当比较未填充根管和纤维桩根管时，ROC 曲线下面积、特异性和敏感性存在显著差异（P < 0.05）；然而，对于所研究的不同设备，没有观察到差异。
显示设备的类型不会影响 VRF 的检出。因此，可以使用不同的屏幕尺寸和分辨率来检测 VRF。
