Post-Graduate Program in Dentistry, Pontifical Catholic University of Rio Grande do Sul - PUCRS, Porto Alegre, Brazil.
Int Endod J. 2010 Dec;43(12):1122-31. doi: 10.1111/j.1365-2591.2010.01787.x. Epub 2010 Aug 31.
To analyse the anatomy of the root canal system of maxillary premolars with three distinct roots using high-resolution computed tomography (μCT).
Ten three-rooted human maxillary premolars were scanned transversally from crown to apex at 42μm intervals using a high-resolution desktop μTC system (Skyscan 1072). The images were processed and analysed for the following features: cross section of the roots and canals in the apical, middle and coronal thirds; location of the apical foramen; distance from the pulp chamber roof to the bifurcation and trifurcation of the canals and anatomic variations of the root canal system. The results were expressed descriptively.
The cross-sectional shape of canals was heterogeneous along the length of the roots. The location of the apical foramen varied, tending to lie palatally or distally. The buccal pulp horn was larger than the palatal. The mean distance from the most cervical region of the pulp chamber roof to the bifurcation and trifurcation of the canals was 3.13 and 5.08mm, respectively.
Features of the internal anatomy of the pulp cavity of three-rooted maxillary premolars were identified with the use of μCT. The results revealed the heterogeneity of three-rooted maxillary premolars.
使用高分辨率计算机断层扫描（μCT）分析上颌前磨牙三根的根管系统解剖结构。
使用高分辨率台式 μTC 系统（Skyscan 1072）以 42μm 的间隔从牙冠到根尖横向扫描 10 个人类上颌前磨牙的三根。对图像进行处理和分析，以获取以下特征：根尖、中 1/3 和颈 1/3 处的根管和根横截面；根尖孔的位置；从牙髓腔顶到根管分叉和三分叉的距离以及根管系统的解剖变异。结果以描述性方式表示。
根管的横截面形状沿根的长度而异。根尖孔的位置不同，倾向于位于腭侧或远中侧。颊侧牙髓角大于腭侧。从牙髓腔顶最颈区到根管分叉和三分叉的平均距离分别为 3.13mm 和 5.08mm。
使用 μCT 确定了上颌前磨牙三根的牙髓腔内部解剖特征。结果揭示了上颌前磨牙三根的异质性。
