Tolentino Elen de Souza, Amoroso-Silva Pablo Andrés, Alcalde Murilo Priori, Yamashita Fernanda Chiguti, Iwaki Lilian Cristina Vessoni, Rubira-Bullen Izabel Regina Fischer, Duarte Marco Antônio Húngaro
Department of Dentistry, State University of Maringá, Maringá, PR, Brazil, Brazil.
Department of Restorative Dentistry, State University of Londrina, Londrina, PR, Brazil, Brazil.
Imaging Sci Dent. 2021 Mar;51(1):27-34. doi: 10.5624/isd.20200144. Epub 2021 Jan 28.
This study was performed to compare the ability of limited- and large-volume cone-beam computed tomography (CBCT) to display isthmuses in the apical root canals of mandibular molars.
Forty human mandibular first molars with isthmuses in the apical 3 mm of mesial roots were scanned by micro-computed tomography (micro-CT), and their thickness, area, and length were recorded. The samples were examined using 2 CBCT systems, using the smallest voxels and field of view available for each device. The Mann-Whitney, Friedman, and Dunn multiple comparison tests were performed (α=0.05).
The 3D Accuitomo 170 and i-Cat devices detected 77.5% and 75.0% of isthmuses, respectively (>0.05). For length measurements, there were significant differences between micro-CT and both 3D Accuitomo 170 and i-Cat (<0.05).
Both CBCT systems performed similarly and did not detect isthmuses in the apical third in some cases. CBCT still does not equal the performance of micro-CT in isthmus detection, but it is nonetheless a valuable tool in endodontic practice.
本研究旨在比较小视野和大视野锥形束计算机断层扫描（CBCT）显示下颌磨牙根尖根管峡部的能力。
选取40颗在近中根根尖3mm处有峡部的人类下颌第一磨牙，采用微计算机断层扫描（micro-CT）进行扫描，并记录其厚度、面积和长度。使用2种CBCT系统对样本进行检查，每种设备均使用最小体素和可用视野。进行曼-惠特尼检验、弗里德曼检验和邓恩多重比较检验（α = 0.05）。
3D Accuitomo 170和i-Cat设备分别检测到77.5%和75.0%的峡部（>0.05）。对于长度测量，micro-CT与3D Accuitomo 170和i-Cat之间均存在显著差异（<0.05）。
两种CBCT系统表现相似，在某些情况下无法检测到根尖三分之一处的峡部。CBCT在峡部检测方面仍不及micro-CT，但仍是牙髓病治疗实践中的一种有价值的工具。
