Martins Luciano Augusto Cano, Brasil Danieli Moura, Freitas Deborah Queiroz, Oliveira Matheus L
Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.
Imaging Sci Dent. 2023 Mar;53(1):61-67. doi: 10.5624/isd.20220186. Epub 2023 Jan 11.
The aim of this study was to objectively detect simulated tooth ankylosis using a novel method involving cone-beam computed tomography (CBCT).
Tooth ankylosis was simulated in single-rooted human permanent teeth, and CBCT scans were acquired at different current levels (5, 6.3, and 8 mA) and voxel sizes (0.08, 0.125, and 0.2). In axial reconstructions, a line of interest was perpendicularly placed over the periodontal ligament space of 21 ankylosed and 21 non-ankylosed regions, and the CBCT grey values of all voxels along the line of interest were plotted against their corresponding X-coordinates through a line graph to generate a profile. The image contrast was increased by 30% and 60% and the profile assessment was repeated. The internal area of the resulting parabolas was obtained from all images and compared between ankylosed and non-ankylosed regions under different contrast enhancement conditions, voxel sizes, and mA levels using multi-way analysis of variance with the Tukey test (α=0.05).
The internal area of the parabolas of all non-ankylosed regions was significantly higher than that of the ankylosed regions (<0.05). Contrast enhancement led to a significantly greater internal area of the parabolas of non-ankylosed regions (<0.05). Overall, voxel size and mA did not significantly influence the internal area of the parabolas (>0.05).
The proposed novel method revealed a relevant degree of applicability in the detection of simulated tooth ankylosis; increased image contrast led to greater detectability.
本研究的目的是使用一种涉及锥形束计算机断层扫描（CBCT）的新方法客观地检测模拟的牙齿粘连。
在单根人类恒牙中模拟牙齿粘连，并在不同电流水平（5、6.3和8 mA）和体素大小（0.08、0.125和0.2）下进行CBCT扫描。在轴向重建中，在21个粘连区域和21个非粘连区域的牙周膜间隙上垂直放置一条感兴趣线，通过线图将沿感兴趣线的所有体素的CBCT灰度值相对于其相应的X坐标进行绘制，以生成一个剖面图。将图像对比度提高30%和60%，并重复剖面图评估。从所有图像中获得所得抛物线的内部面积，并使用Tukey检验的多因素方差分析（α=0.05）在不同对比度增强条件、体素大小和mA水平下比较粘连区域和非粘连区域之间的内部面积。
所有非粘连区域抛物线的内部面积均显著高于粘连区域（<0.05）。对比度增强导致非粘连区域抛物线的内部面积显著增大（<0.05）。总体而言，体素大小和mA对抛物线的内部面积没有显著影响（>0.05）。
所提出的新方法在检测模拟牙齿粘连方面显示出一定程度的适用性；增加图像对比度可提高可检测性。
