Estrela Carlos, Costa Marcus Vinicius C, Bueno Mike R, Rabelo Luiz Eduardo G, Decurcio Daniel A, Silva Júlio A, Estrela Cyntia R A
Department of Stomatology Sciences, UFG -Universidade Federal de Goiás,Goiânia,GO,Brazil.
Department of Radiology, SLMANDIC - Faculdade São Leopoldo Mandic, Instituto São Leopoldo Mandic, Campinas, SP, Brazil.
Braz Dent J. 2020 Nov-Dec;31(6):582-588. doi: 10.1590/0103-6440202005899.
This study evaluated the dimensions of intraradicular posts using a new cone beam CT (CBCT) software, and verified the potential of blooming artifact reduction. Sixty-three single-rooted human teeth were shaped, obturated, prepared for intracanal post placement and distributed into three groups: G1: anatomically customized prefabricated glass fiber posts; G2: low-fusion alloy posts; G3: gold alloy posts. After post fabrication and luting with RelyX U200®, specimens were sectioned axially at 9 mm from the root apex, and markings were made on the root surfaces (X-, Y- and Z-axes). The dimensions of the original posts (control group) were measured using a digital micrometer. CBCT scans of the teeth were obtained using a PreXion 3D Elite® scanner. Posts were measured on CBCT scans using DICOM files and the e-Vol DX software. A specific filter, Blooming Artefact Reduction (BAR), was developed to analyze intracanal posts. Statistical data were evaluated using the Van de Waerden nonparametric analysis of variance and, after that, normalized data were analyzed using the Tukey test. The level of significance was set at α = 5%. The measures of the anatomical prefabricated, low-fusion alloy and gold alloy intracanal posts obtained using the e-Vol DX CBCT software and a micrometer were not significantly different (p>0.05). The use of the BAR filter of the e-Vol DX software application did not induce any dimensional differences on CBCT scans of intracanal posts when compared with measurements made with a micrometer on original posts. The use of the BAR filter eliminated blooming artifacts.
本研究使用一种新型锥束CT（CBCT）软件评估根管内桩的尺寸，并验证减少伪影的潜力。选取63颗单根人牙进行根管预备、充填，制备根管内桩道，然后分为三组：G1组：解剖学定制预成玻璃纤维桩；G2组：低熔合金桩；G3组：金合金桩。桩制作完成并用RelyX U200®粘结后，将标本从根尖向冠方9mm处轴向切片，并在牙根表面（X、Y和Z轴）做标记。使用数字千分尺测量原始桩（对照组）的尺寸。使用PreXion 3D Elite®扫描仪对牙齿进行CBCT扫描。利用DICOM文件和e-Vol DX软件在CBCT扫描图像上测量桩的尺寸。开发了一种特殊的滤波器——伪影减少（BAR）滤波器，用于分析根管内桩。使用范德瓦尔登非参数方差分析评估统计数据，之后使用Tukey检验分析标准化数据。显著性水平设定为α = 5%。使用e-Vol DX CBCT软件和千分尺测量解剖学预成、低熔合金和金合金根管内桩的尺寸，结果无显著差异（p>0.05）。与用千分尺测量原始桩的尺寸相比，e-Vol DX软件应用中的BAR滤波器在CBCT扫描根管内桩时未引起任何尺寸差异。使用BAR滤波器消除了伪影。
