Freitas Ana Priscila Lira de Farias, Peixoto Larissa Rangel, Mariz Suassuna Fernanda Clotilde, Bento Patrícia Meira, Maia Amorim Ana Marly Araújo, Rovaris Silva Karla, de Almeida Barros Renata Quirino, Pontual de Andrade Lima Andrea Dos Anjos, de Melo Daniela Pita
Department of Oral Diagnosis, State University of Paraíba, Campina Grande, PB, Brazil.
Department of Oral Diagnosis, Federal University of Piauí, Teresina, PI, Brazil.
Imaging Sci Dent. 2023 Jun;53(2):127-135. doi: 10.5624/isd.20220185. Epub 2023 Mar 24.
This study assessed the intensity of artifacts produced by 2 metal posts, 2 cements, and different exposure parameters using 2 cone-beam computed tomography (CBCT) units.
The sample was composed of 20 single-rooted premolars, divided into 4 groups: Ni-Cr/zinc phosphate, Ni-Cr/resin cement, Ag-Pd/zinc phosphate, and Ag-Pd/resin cement. Samples were scanned before and after post insertion and cementation using a CS9000 3D scanner with 4 exposure parameters (85/90 kV and 6.3/10 mA) and an i-CAT scanner with 120 kV and 5 mA. The presence of artifacts was assessed subjectively by 2 observers and objectively by a trained observer using ImageJ software. The Mann-Whitney, Wilcoxon, weighted kappa, and chi-square tests were used to assess data at a 95% confidence level (α<0.05).
In the subjective analyses, AgPd presented more hypodense and hyperdense lines than NiCr (<0.05), and more hypodense halos were found using i-CAT (<0.05) than using CS9000 3D. More hypodense halos, hypodense lines, and hyperdense lines were observed at 10 mA than at 6.3 mA (<0.05). More hypodense halos were observed at 85 kV than at 90 kV (<0.05). CS9000 3D presented more hypodense and hyperdense lines than i-CAT (<0.05). In the objective analyses, AgPd presented higher percentages of hyperdense and hypodense artifacts than NiCr (<0.05). Zinc phosphate cement presented higher hyperdense artifact percentages on CS9000 3D scans (<0.05). CS9000 3D presented higher artifact percentages than i-CAT (<0.05).
High-atomic-number alloys, higher tube current, and lower tube voltage may increase the artifacts present in CBCT images.
本研究使用两台锥形束计算机断层扫描（CBCT）设备，评估了两种金属桩、两种粘结剂以及不同曝光参数所产生的伪影强度。
样本由20颗单根前磨牙组成，分为4组：镍铬合金/磷酸锌粘结剂、镍铬合金/树脂粘结剂、银钯合金/磷酸锌粘结剂和银钯合金/树脂粘结剂。使用具有4种曝光参数（85/90 kV和6.3/10 mA）的CS9000 3D扫描仪以及具有120 kV和5 mA的i-CAT扫描仪，在桩植入和粘结前后对样本进行扫描。由2名观察者主观评估伪影的存在情况，并由一名经过培训的观察者使用ImageJ软件进行客观评估。使用曼-惠特尼检验、威尔科克森检验、加权卡方检验和卡方检验，在95%置信水平（α<0.05）下评估数据。
在主观分析中，银钯合金比镍铬合金呈现出更多的低密度和高密度线条（<0.05），并且使用i-CAT扫描仪比使用CS9000 3D扫描仪发现更多的低密度晕环（<0.05）。在10 mA时比在6.3 mA时观察到更多的低密度晕环、低密度线条和高密度线条（<0.05）。在85 kV时比在90 kV时观察到更多的低密度晕环（<0.05）。CS9000 3D扫描仪比i-CAT扫描仪呈现出更多的低密度和高密度线条（<0.05）。在客观分析中，银钯合金比镍铬合金呈现出更高百分比的高密度和低密度伪影（<0.05）。磷酸锌粘结剂在CS9000 3D扫描中呈现出更高百分比的高密度伪影（<0.05）。CS9000 3D扫描仪比i-CAT扫描仪呈现出更高百分比的伪影（<0.05）。
高原子序数合金、更高的管电流和更低的管电压可能会增加CBCT图像中出现的伪影。
