Identification of a C-shaped canal system in mandibular second molars - Part III: Anatomic features revealed by digital subtraction radiography
Identification of a C-shaped canal system in mandibular second molars - Part III: Anatomic features revealed by digital subtraction radiography
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下颌第二磨牙 C 形根管系统的识别 - 第三部分：数字减影 X 线摄影揭示的解剖特征
DOI：
10.1016/j.joen.2008.06.013
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发表时间：
2008-10-01
影响因子：
4.2
通讯作者：
Fan, Mingwen
中科院分区：
文献类型：
--
作者：
Fan, Wei;Fan, Bing;Fan, Mingwen
本研究的目的是探讨数字减影X线摄影（DSR）显示下颌第二磨牙C形根管系统的解剖特征的能力，在根管内造影剂的帮助下。收集30颗牙根融合的下颌第二磨牙，保存在10%福尔马林溶液中。在用微计算机断层扫描（mu CT）20扫描并重建后，对根管进行机械和化学清洁以去除其牙髓组织。对每颗牙齿的下颌骨板拍摄颊舌数字X线摄影（放射线照相[RVG]）图像。将造影剂引入根管内后，以与之前相同的方式再次拍摄RVG图像。将造影剂引入前后拍摄的数字图像重叠，并使用3D Doctor软件（Able Software Corp，列克星敦，MA）进行图像减影。将所有基于mu CT扫描的减影椎管图像（DSR）和重建椎管图像分为三类（即I型、II型和III型）。以根管重建图像的分类为标准，评价DSR分类的敏感性（Se）和特异性（Sp）。结果经Wilcoxon统计学检验，两种分类之间无显著性差异（p > 0.05）。DSR分类在所有三个类别中具有非常高的Se和Sp。结论DSR技术在临床上应用于下颌第二磨牙C形根管系统的解剖学研究是可行的。
The purpose of this study was to investigate the ability of digital subtraction radiography (DSR) to reveal anatomic features of C-shaped canal systems in mandibular second molars with the aid of an intraradicular contrast medium. Thirty mandibular second molars with fused roots were collected and stored in 10% formalin solution. After being scanned with microcomputed tomography (mu CT) 20 and reconstructed, the root canals were mechanically and chemically cleaned of their pulp tissue. Buccal-lingual digital radiographic (radiovisiography [RVG]) images were taken with mandibular bone plates for each tooth. After the introduction of contrast medium into canals, RVG images were taken again in the same way as before. The digital images taken before and after contrast medium introduction were overlapped, and the image subtraction was performed by using the 3D Doctor software (Able Software Corp, Lexington, MA). All the subtracted canal images (DSR) and reconstructed canal images based on mu CT scanning were classified into three categories (ie, type I, II, and III). The classifications based on reconstructed canal images were used as the standard to evaluate the sensitivity (Se) and specificity (Sp) of DSR classification. The results were subjected to the Wilcoxon statistical test, which showed there was no significant difference between the two classifications (p > 0.05). The DSR classification had a very high Se and Sp in all three categories. it is feasible to use the DSR technique clinically to identify anatomic features of the C-shaped canal system in mandibular second molars.