Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil.
Department of Biomaterials and Oral Biology, School of Dentistry, University of São Paulo (USP), São Paulo, Brazil.
Sci Rep. 2019 Jul 22;9(1):10562. doi: 10.1038/s41598-019-46530-z.
This study describes the effect of the software binning and data averaging during micro CT volume acquisition, on the assessment of root resorption volumes. The mesial roots (n = 9), after orthodontic tooth movement during 14 days, were scanned, using a micro CT system (9 µm/pixel). All roots were reconstructed and the volumes of the resorption lacunae evaluated. The height and width of the pixels vary according to the parameters (A1, A2, A3, A4, A5, A6, A7, A8, A9) used during the scan. In the root #1 the mean volumes of resorption were similar in A4 and A7; in the root #2 there was no similarity in the mean volumes of resorption in any of the parameters; in root #3 only A4 presented mean volume different from zero (3.05 × 10°). In the root #5, the A1 and A7 presented similar mean volumes and in the A6 and A9 presented near mean volumes. In the root #9 the A1, A4, and A7 presented similar mean volumes and A6 and A9 also had similar mean volumes. Significant difference was detected in the volume of resorption among the roots #2, #5 and #9 (p = 0.04). When analyzing delicate structures such as the roots of rats' molars, the variation of such parameters will significantly influence the results.
本研究描述了在 micro CT 容积采集过程中软件 binning 和数据平均对根吸收体积评估的影响。在正畸牙齿移动 14 天后，使用 micro CT 系统（9μm/pixel）扫描近中根（n=9）。重建所有根并评估吸收腔的体积。像素的高度和宽度根据扫描过程中使用的参数（A1、A2、A3、A4、A5、A6、A7、A8、A9）而变化。在根 1 中，A4 和 A7 中的吸收体积的平均值相似；在根 2 中，任何参数中的吸收体积平均值都没有相似性；在根 3 中，只有 A4 的平均体积不为零（3.05×10°）。在根 5 中，A1 和 A7 的平均体积相似，而在 A6 和 A9 中，平均体积接近。在根 9 中，A1、A4 和 A7 的平均体积相似，A6 和 A9 的平均体积也相似。在根 2、根 5 和根 9 之间检测到吸收体积的显著差异（p=0.04）。在分析如大鼠磨牙的根部等精细结构时，这些参数的变化将显著影响结果。
