Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey.
Dentomaxillofac Radiol. 2014;43(4):20130332. doi: 10.1259/dmfr.20130332. Epub 2014 Mar 20.
To investigate the reliability and accuracy of cone beam CT (CBCT) images obtained at different fields of view in detecting and quantifying simulated buccal marginal alveolar peri-implant defects.
Simulated buccal defects were prepared in 69 implants inserted into cadaver mandibles. CBCT images at three different fields of view were acquired: 40 × 40, 60 × 60 and 100 × 100 mm. The presence or absence of defects was assessed on three sets of images using a five-point scale by three observers. Observers also measured the depth, width and volume of defects on CBCT images, which were compared with physical measurements. The kappa value was calculated to assess intra- and interobserver agreement. Six-way repeated analysis of variance was used to evaluate treatment effects on the diagnosis. Pairwise comparisons of median true-positive and true-negative rates were calculated by the χ² test. Pearson's correlation coefficient was used to determine the relationship between measurements. Significance level was set as p < 0.05.
All observers had excellent intra-observer agreement. Defect status (p < 0.001) and defect size (p < 0.001) factors were statistically significant. Pairwise interactions were found between defect status and defect size (p = 0.001). No differences between median true-positive or true-negative values were found between CBCT field of views (p > 0.05). Significant correlations were found between physical and CBCT measurements (p < 0.001).
All CBCT images performed similarly for the detection of simulated buccal marginal alveolar peri-implant defects. Depth, width and volume measurements of the defects from various CBCT images correlated highly with physical measurements.
研究不同视野锥形束 CT（CBCT）图像在检测和定量模拟颊侧边缘牙槽嵴种植体周围缺损中的可靠性和准确性。
在 69 个植入物插入的 cadaver 下颌骨中制备模拟颊侧缺损。在三种不同视野下获取 CBCT 图像：40×40、60×60 和 100×100 mm。三位观察者使用五分制评估三组图像上是否存在缺陷。观察者还在 CBCT 图像上测量缺陷的深度、宽度和体积，并与物理测量值进行比较。计算kappa 值以评估观察者内和观察者间的一致性。采用六向重复方差分析评估治疗对诊断的影响。通过 χ²检验计算中位真阳性和真阴性率的两两比较。采用 Pearson 相关系数确定测量值之间的关系。显著性水平设置为 p<0.05。
所有观察者的观察者内一致性均良好。缺陷状态（p<0.001）和缺陷大小（p<0.001）因素具有统计学意义。在缺陷状态和缺陷大小之间发现了两两相互作用（p=0.001）。CBCT 视野之间的中位真阳性或真阴性值之间没有差异（p>0.05）。物理和 CBCT 测量之间存在显著相关性（p<0.001）。
所有 CBCT 图像在检测模拟颊侧边缘牙槽嵴种植体周围缺损方面表现相似。不同 CBCT 图像上缺陷的深度、宽度和体积测量值与物理测量值高度相关。
