Federal University of Espírito Santo, Vitória, Espírito Santo, Brazil.
Dental Sciences Graduate Program, Federal University of Espírito Santo (UFES), Av. Marechal Campos 1468, Maruípe Vitória, ES, 29043900, Brazil.
Clin Oral Investig. 2024 May 15;28(6):315. doi: 10.1007/s00784-024-05712-4.
To assess whether filter and contrast adjustments can improve the accuracy of CBCT in measuring the buccal bone thickness (BBT) adjacent to dental implants by reducing blooming artifacts.
Homogeneous bone blocks with peri-implant BBT of 0.3 mm, 0.5 mm, and 1 mm were scanned using the Orthophos SL system. Three dentists measured the BBT in 234 CBCT scans under different settings of contrast adjustments and 'Sharpen' filter activation. Additionally, implant diameter measurements were taken to assess blooming artifact expression. The differences between tomographic and actual measurements of BBT and implant diameter [(CBCT - actual) * 100 / actual] were subjected to Mixed ANOVA (α = 0.05).
The group with the thinnest BBT (0.3 mm) had the greatest difference between tomographic and actual measurements (79.9% ± 29.0%). Conversely, the 0.5 mm (36.1% ± 38.4%) and 1 mm (29.4% ± 12.3%) groups exhibited lower differences (p < 0.05). 'Sharpen' filter activation reduced blooming expression since it resulted in a lower difference for implant diameter (p < 0.05), but it did not influence BBT measurements (p = 0.673). Contrast settings had no impact on BBT (p = 0.054) or implant diameter measurements (p = 0.079).
Although filter activation reduced blooming artifacts, neither filter nor contrast adjustments improved the accuracy of CBCT in measuring peri-implant BBT; actual BBT influenced this task.
When assessing the peri-implant buccal bone plate in the CBCT system studied, dental surgeons may find it beneficial to adjust contrast and apply filters according to their preferences, since such adjustments were found to have no adverse effects on the diagnostic accuracy of this task. The use of the 'Sharpen' filter may lead to improved representation of implant dimensions.
评估通过降低blooming 伪影，调整滤波和对比度能否提高 CBCT 测量种植体周围颊侧骨厚度（BBT）的准确性。
使用 Orthophos SL 系统对具有 0.3、0.5 和 1mm 种植体周围 BBT 的同种异体骨块进行扫描。3 名牙医在不同对比度调整和“锐化”滤波器激活设置下，对 234 个 CBCT 扫描中的 BBT 进行测量。此外，还对种植体直径测量以评估 blooming 伪影的表达。对 BBT 和种植体直径的断层扫描和实际测量之间的差异进行[(CBCT-实际)*100/实际]的混合方差分析（α=0.05）。
最薄 BBT（0.3mm）组的断层扫描和实际测量之间的差异最大（79.9%±29.0%）。相反，0.5mm（36.1%±38.4%）和 1mm（29.4%±12.3%）组的差异较小（p<0.05）。“锐化”滤波器的激活减少了 blooming 的表达，因为它导致种植体直径的差异较小（p<0.05），但不影响 BBT 测量（p=0.673）。对比度设置对 BBT（p=0.054）或种植体直径测量（p=0.079）均无影响。
尽管滤波器的激活减少了 blooming 伪影，但无论是滤波器还是对比度调整都不能提高 CBCT 测量种植体周围 BBT 的准确性；实际的 BBT 影响了这项任务。
在评估研究中的 CBCT 系统中的种植体周围颊侧骨板时，牙科医生可能会发现根据自己的喜好调整对比度和应用滤波器是有益的，因为这种调整对该任务的诊断准确性没有不利影响。使用“锐化”滤波器可能会改善种植体尺寸的表示。
