Accuracy of linear measurements performed with two imaging software in cone-beam computed tomography scans of dry human mandibles

ABSTRACT The present study aimed to assess the accuracy of linear measurements performed with two software packages in multislice (MSCT) and cone beam (CBCT) computed tomography (CT) images. The sample consisted of 10 human mandibles marked standardly 8 times with metallic orthodontic wires. The mandibles underwent both MSCT and CBCT scanning and were measured linearly and digitally with two software packages, namely Studio 3.1® (Anne Solutions®, SP, Brazil) (ST) and Implant Viewer 2.817® (Anne Solutions®, SP, Brazil) (IV). The linear measurements were the mandibular height (MH) and width (MW), and the distance from the alveolar ridge to the mandibular canal (AC). To validate the measurements, the mandibles were sectioned in the marked regions and measured with a digital caliper. Statistically significant differences were not observed between the measurements (MH, MW, and AC) taken digitally with the two software packages from images obtained from the two scanning modalities (MSCT and CBCT) and the measurements taken manually with a digital caliper (p>0.05). MSCT and CBCT images measured digitally with ST and IV software packages resulted in reliable outcomes when compared to measurements obtained manually. Both software and imaging modalities are reliably useful for planning surgical procedure in the dental practice.

摘要：本研究旨在评估基于多层螺旋计算机断层扫描（multislice computed tomography, MSCT）与锥形束计算机断层扫描（cone beam computed tomography, CBCT）图像，使用两款软件包开展线性测量的精度。研究样本包含10具人类下颌骨，以金属正畸钢丝进行8处标准标记。所有下颌骨均接受MSCT与CBCT扫描，并分别通过两款软件——Studio 3.1®（Anne Solutions®，巴西圣保罗州）（简称ST）与Implant Viewer 2.817®（Anne Solutions®，巴西圣保罗州）（简称IV）进行数字化线性测量。本次测量的线性指标包括下颌骨高度（mandibular height, MH）、下颌骨宽度（mandibular width, MW）以及牙槽嵴至下颌管的距离（alveolar ridge to mandibular canal, AC）。为验证测量结果的准确性，研究人员将下颌骨在标记区域处进行切片后，使用数字游标卡尺开展手动测量。经统计分析，两种扫描模式（MSCT与CBCT）获取的图像经两款软件数字化测得的MH、MW与AC值，与数字游标卡尺手动测量值之间均无统计学显著性差异（p>0.05）。相较于手动测量结果，使用ST与IV软件对MSCT及CBCT图像进行数字化测量所得结果可靠。两款软件及两种成像模式均可可靠应用于牙科临床的外科手术规划工作中。