Department of Oral Diagnosis and Surgery, São José dos Campos Dental School, São Paulo State University, São José dos Campos, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2011 Mar;139(3):324-33. doi: 10.1016/j.ajodo.2009.03.046.
Root resorption can cause damage in orthodontic patients. Digital subtraction radiography (DSR) is a useful resource for the detection of mineral losses. The purpose of this study was to compare the efficacy of digital radiography (DR) and DSR in detecting simulated external root resorption. Examiner agreement between the 2 techniques was also evaluated.
Root resorptions of various sizes were simulated on the apical and lingual aspects of 49 teeth from 9 dry human mandibles. The teeth were radiographed in standardized conditions. The radiographs were registered with Regeemy Image Registration and Mosaicking (version 0.2.43-RCB, DPI-INPE, São José dos Campos, São Paulo, Brazil) and subtracted with Image Tool (University of Texas Health Science Center at San Antonio). The subtracted images and the digital radiographs were evaluated by 3 oral radiologists.
No statistically significant differences were found for the methods in the detection of apical root resorptions, independently from lesion size, and of lingual resorptions of 1.2 mm or greater. DSR was significantly better than DR for detection of lingual resorptions up to 1 mm. Resorptions less than 0.5 mm were not precisely detected by either method. DSR provided better intraexaminer and interexaminer agreement than did DR.
Both methods are precise for detection of apical root resorptions as small as 0.5 mm and lingual resorptions of 1 mm or more. However, DSR frequently performed better than did DR.
根吸收可导致正畸患者受损。数字减影放射摄影术（DSR）是检测矿物质损失的有用资源。本研究的目的是比较数字射线照相术（DR）和 DSR 在检测模拟外吸收的效果。还评估了这两种技术的检查者之间的一致性。
在 9 个人类干燥下颌骨的 49 个牙齿的根尖和舌侧模拟了不同大小的根吸收。以标准化条件对牙齿进行放射照相。将射线照相与 Regeemy 图像注册和镶嵌（版本 0.2.43-RCB，DPI-INPE，SãoJosé dos Campos，São Paulo，巴西）进行注册，并使用 Image Tool（德克萨斯大学健康科学中心圣安东尼奥分校）进行减影。由 3 名口腔放射科医生评估减影图像和数字射线照相。
在检测根尖根吸收方面，无论病变大小如何，以及检测 1.2 毫米或更大的舌侧吸收方面，两种方法均无统计学差异。对于检测最大为 1 毫米的舌侧吸收，DSR 明显优于 DR。对于小于 0.5 毫米的吸收，两种方法均无法精确检测到。DSR 提供了比 DR 更好的检查者内和检查者间一致性。
两种方法都可以精确检测到小至 0.5 毫米的根尖根吸收和 1 毫米或更大的舌侧吸收。但是，DSR 的表现通常优于 DR。
