Anas A, Asaad Jm, Tarboush Ka
Int J Health Sci (Qassim). 2010 Nov;4(2):156-67.
This in vitro study was conducted to compare the accuracy of two digital image receptors in identifying the location of tip of a fine endodontic file and radiographic apex in mandibular posterior teeth.
Fourteen human cadaver mandibles with retained molars were selected. These molars were prepared for access to the canals and an endodontic file #10 was introduced into the canal at one of the three random distances from the apex of the tooth. At each distance from the apex and at the apex of the tooth, images were made with two different image receptors; DenOptix storage phosphor plates and Gendex CCD sensor. Six raters viewed all the images for identification of the radiographic apex of the tooth and the tip of the endodontic file. Images were displayed randomly under standardized conditions. To assess intra-rater reliability, all the examiners viewed a subset of randomly selected images again after a time period of one week, inter rater reliability was also assessed. At the end of the study, teeth were extracted and the length of the canals measured to obtain a gold standard.
T-test revealed a significant main effect for the type of image, indicating that raters' error in identifying structures of interest was significantly higher for Denoptix storage phosphor plates.
The results of the study clearly reveal that Gnedex CCD produce most reliable images for Root Canal working length estimation when compared with Denoptix SPP.
本体外研究旨在比较两种数字影像接收器在下颌后牙中确定细根管锉尖端位置及影像学根尖位置的准确性。
选取14具保留磨牙的人类尸体下颌骨。对这些磨牙进行开髓准备，并将10号根管锉随机插入距牙根尖三个不同距离之一的根管内。在距根尖的每个距离以及根尖处，使用两种不同的影像接收器进行成像；DenOptix存储磷光板和Gendex CCD传感器。六名评估者观察所有图像以确定牙齿的影像学根尖和根管锉的尖端。图像在标准化条件下随机显示。为评估评估者内可靠性，所有检查者在一周后再次观察一组随机选择图像的子集，同时也评估评估者间可靠性。在研究结束时，拔除牙齿并测量根管长度以获得金标准。
t检验显示影像类型有显著的主效应，表明评估者在识别感兴趣结构时，DenOptix存储磷光板的误差显著更高。
研究结果清楚地表明，与Denoptix SPP相比，Gnedex CCD在根管工作长度估计方面能产生最可靠的图像。
