Accuracy of cone beam computed tomography-derived casts: A comparative study
Accuracy of cone beam computed tomography-derived casts: A comparative study
复制标题
DOI：
10.1016/j.prosdent.2019.11.021
复制
发表时间：
2021-01-01
影响因子：
4.6
通讯作者：
Jacobs, Reinhilde
中科院分区：
文献类型：
--
作者：
Shujaat, Sohaib;Shaheen, Eman;Jacobs, Reinhilde
问题陈述。大型锥形束计算机断层扫描（CBCT）衍生的牙颌面解剖模型的外表面和内部骨小梁结构的准确性尚未得到彻底的研究。本比较研究的目的是通过应用一种创新的无标志方法学来评估CBCT衍生的下颌骨模型的定量准确性。根据入选和排除标准，获得了一名18岁女性的CBCT扫描。下颌骨被分割并从数据集中分离。分割的下颌骨包括描述皮质表面，小梁结构，萌出的牙齿，和根形成不完全的阻生第三磨牙。15个下颌骨模型通过使用基于多喷嘴（MJ=4）、数字光处理（DLP=4）、立体光刻（SLA=2）、熔融沉积成型（FDM=2）、colorjet（CJ=2）和选择性激光烧结（LS=1）的高质量医用商业和办公打印机制造。每个打印的模型被扫描并叠加到原始下颌骨上，完整下颌骨和个体表面的准确性用彩色编码地图进行评估。当比较与基于打印技术的完整铸件相关的整体组合误差时，MJ显示出最高的准确度（0.6 +/- 0.7 mm）。FDM技术（2.2 +/- 3.4 mm）的总体绝对平均差最高。两个个体表面和完整下颌骨的比较无显著性差异。总的来说，模型复制骨骼和牙齿解剖表面很好。然而，观察到与描述小梁结构有关的缺点。
Statement of problem. The accuracy of the external surface and internal trabecular architecture of large cone beam computed tomography (CBCT)-derived dentomaxillofacial anatomic casts has not yet been thoroughly investigated.Purpose. The purpose of this comparative study was to evaluate the quantitative accuracy of CBCTderived mandibular casts by applying an innovative land-mark free methodology.Material and methods. Following inclusion and exclusion criteria, a CBCT scan of an 18-year-old woman was acquired. The mandible was segmented and isolated from the data set. The segmented mandible included depiction of the cortical surface, trabecular architecture, erupted teeth, and impacted third molars with incomplete root formation. Fifteen mandibular casts were fabricated by using multijet (MJ=4), digital light processing (DLP=4), stereolithography (SLA=2), fused deposition modeling (FDM=2), colorjet (CJ=2), and selective laser sintering (LS=1)-based high-quality medical commercial and office printers. Each printed cast was scanned and superimposed onto the original mandible, and the accuracy of the complete mandible and individual surfaces were assessed with a color-coded map.Results. When the overall combined error associated with complete casts based on printing technology were compared, MJ showed the highest accuracy (0.6 +/- 0.7 mm). FDM technology (2.2 +/- 3.4 mm) had the highest overall absolute mean difference. No significant difference was observed when both individual surfaces and the complete mandible were compared.Conclusions. Overall, casts replicated the skeletal and dental anatomic surfaces well. However, shortcomings were observed in relation to depicting trabecular architecture.