Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, Brazil.
Department of Surgery, Division of Oral Radiology, São Paulo State University (Unesp), School of Dentistry, Araçatuba, Brazil.
Dentomaxillofac Radiol. 2023 Nov;52(8):20230029. doi: 10.1259/dmfr.20230029. Epub 2023 Jul 3.
To assess the distortion of high-density materials using two CBCT devices presenting convex triangular and cylindrical fields of view (FOVs).
Four high-density cylinders were individually placed in a polymethylmethacrylate phantom. 192 CBCT scans were acquired using the convex triangular and cylindrical FOVs of Veraviewepocs R100 (R100) and Veraview X800 (X800) devices. Using Horos's software, two oral radiologists determined the cylinders' horizontal and vertical dimensional alterations. Nine oral radiologists subjectively identified each cylinder's axial shape distortion. Statistical analysis comprised Multiway ANOVA (α = 5%), and the Kruskal-Wallis test.
The distortion in the axial plane was greater in the convex triangular FOVs for both devices in almost all the materials ( < 0.05). The evaluators subjectively identified a shape distortion in both FOVs for R100 device ( < 0.001), while no distortion was identified for X800 device ( = 0.620). A vertical magnification of all materials was observed in both FOVs for both devices ( < 0.05). No differences among vertical regions ( = 0.988) nor FOVs ( = 0.544) were found for the R100 device, while all materials showed higher magnification in all regions in the cylindrical FOV ( < 0.001) of the X800 device.
The convex triangular FOV influenced the axial distortion of the high-density materials in both devices. A vertical magnification was observed in both FOVs of both devices, but it was greater in the cylindrical FOV of the X800 device.
使用具有凸面三角形和圆柱形视场（FOV）的两种 CBCT 设备评估高密度材料的失真。
将四个高密度圆柱体单独放置在聚甲基丙烯酸甲酯体模中。使用 Veraviewepocs R100（R100）和 Veraview X800（X800）设备的凸面三角形和圆柱形 FOV 采集了 192 次 CBCT 扫描。两位口腔放射科医生使用 Horos 软件确定了圆柱体的水平和垂直尺寸变化。九位口腔放射科医生主观地识别了每个圆柱体的轴向形状失真。统计分析包括多因素方差分析（α=0.05%）和 Kruskal-Wallis 检验。
在两种设备的凸面三角形 FOV 中，几乎所有材料的轴向平面失真都更大（<0.05）。评估者在两种 FOV 中均识别出 R100 设备的形状失真（<0.001），而在 X800 设备中未识别出失真（=0.620）。在两种设备的两种 FOV 中，所有材料均观察到垂直放大（<0.05）。在 R100 设备中，未发现垂直区域之间的差异（=0.988）或 FOV 之间的差异（=0.544），而在 X800 设备的圆柱形 FOV 中，所有材料在所有区域均显示出更高的放大率（<0.001）。
凸面三角形 FOV 影响了两种设备中高密度材料的轴向失真。在两种设备的两种 FOV 中均观察到垂直放大，但在 X800 设备的圆柱形 FOV 中更大。
