Department of Oral and Maxillofacial Radiology, Academic Centre for Dentistry Amsterdam, Amsterdam, The Netherlands.
J Endod. 2010 Jan;36(1):126-9. doi: 10.1016/j.joen.2009.09.013.
This study compared the accuracy of cone beam computed tomography (CBCT) scans made by five different systems in detecting vertical root fractures (VRFs). It also assessed the influence of the presence of root canal filling (RCF), CBCT slice orientation selection, and the type of tooth (premolar/molar) on detection accuracy.
Eighty endodontically prepared teeth were divided into four groups and placed in dry mandibles. The teeth in groups Fr-F and Fr-NF were artificially fractured; those in groups control-F and control-NF were not. Groups Fr-F and control-F were root filled. CBCT scans were made using five different commercial CBCT systems. Two observers evaluated images in axial, coronal, and sagittal reconstruction planes.
There was a significant difference in detection accuracy among the five systems (p = 0.00001). The presence of RCF did not influence sensitivity (p = 0.16), but it reduced specificity (p = 0.003). Axial slices were significantly more accurate than sagittal and coronal slices (p = 0.0001) in detecting VRF in all systems. Significantly more VRFs were detected among molars than premolars (p = 0.0001).
RCF presence reduced specificity in all systems (p = 0.003) but did not influence accuracy (p = 0.79) except in one system (p = 0.012). Axial slices were the most accurate in detecting VRFs (p = 0.0001).
本研究比较了五种不同系统的锥形束计算机断层扫描（CBCT）在检测垂直根折（VRF）方面的准确性。它还评估了根管充填（RCF）的存在、CBCT 切片方向选择以及牙齿类型（前磨牙/磨牙）对检测准确性的影响。
80 颗经过根管预备的牙齿被分为四组并放置在干燥的下颌骨中。Fr-F 和 Fr-NF 组的牙齿被人为折断；control-F 和 control-NF 组的牙齿未折断。Fr-F 和 control-F 组的牙齿进行根管充填。使用五种不同的商用 CBCT 系统进行 CBCT 扫描。两名观察者在轴位、冠状位和矢状位重建平面上评估图像。
五种系统的检测准确性存在显著差异（p = 0.00001）。RCF 的存在并未影响敏感性（p = 0.16），但降低了特异性（p = 0.003）。在所有系统中，轴向切片在检测 VRF 方面比矢状位和冠状位切片更准确（p = 0.0001）。磨牙中检测到的 VRF 明显多于前磨牙（p = 0.0001）。
RCF 的存在降低了所有系统的特异性（p = 0.003），但除了一个系统（p = 0.012）外，并未影响准确性（p = 0.79）。轴向切片在检测 VRF 方面最准确（p = 0.0001）。
