Department Stomatology, School of Dentistry, University of Granada and Servicio Andaluz de Salud-Distrito Poniente, Granada, Spain.
Department Stomatology, School of Dentistry, University of Granada and Servicio Andaluz de Salud-Distrito Poniente, Granada, Spain.
J Endod. 2017 Sep;43(9):1511-1516. doi: 10.1016/j.joen.2017.03.026. Epub 2017 Jul 20.
The aim of this study was to identify morphologic peculiarities of roots and analyze the root canal configuration in maxillary and mandibular first and second molars by means using cone-beam computed tomographic (CBCT) imaging in a Spanish population.
A total of 284 maxillary molars and 242 mandibular molars from 112 patients were examined in vivo by CBCT imaging; only untreated molars with healthy and fully matured apices were included in this study. Details regarding the number of roots, number of canals, and root canal configuration were recorded.
Maxillary first and second molars had 3 roots in 97.2% and 79%, respectively. In mandibular molars, the frequency of 2 roots was 94% in first molars and 83% in second molars. The canal configuration of the palatal root was 100% Vertucci type I (1-1) in first and second molars. The distobuccal root showed a Vertucci type I configuration in 97% of first and 100% of maxillary second molars. The mesiobuccal root for first molars showed a Vertucci type II configuration (2-1) in 56.5% cases and Vertucci type IV (2-2) in 23.2%. For maxillary second molars, the Vertucci type I configuration reached 52.7%. In mandibular molars, the mesial root showed higher variability. Most frequent was the presence of 2 canals, Vertucci type II for first and second molars. In the distal root, the most common configuration was Vertucci type I in both molars.
The greater percentage of fused roots was observed in maxillary molars. Vertucci type II configuration was more frequent than type IV in the mesial root of mandibular molars and the mesiobuccal root of maxillary molars. A third canal in the mesial root of first mandibular molars (6.7%) was higher than expected.
本研究旨在通过锥形束 CT（CBCT）成像，确定西班牙人群上颌和下颌第一、第二磨牙的根形态特征，并分析其根管形态。
对 112 例患者的 284 颗上颌磨牙和 242 颗下颌磨牙进行了 CBCT 影像学检查；本研究仅纳入未治疗的、根尖健康且完全成熟的磨牙。记录了牙根数量、根管数量和根管形态等详细信息。
上颌第一和第二磨牙的 3 根发生率分别为 97.2%和 79%。下颌磨牙中，第一磨牙的 2 根发生率为 94%，第二磨牙为 83%。腭根的根管形态为 100%的 Vertucci Ⅰ型（1-1），第一和第二磨牙均如此。远颊根在第一磨牙中的 Vertucci Ⅰ型发生率为 97%，在第二磨牙中为 100%。第一磨牙的近颊根显示 Vertucci Ⅱ型（2-1）构型占 56.5%，Vertucci Ⅳ型（2-2）构型占 23.2%。对于上颌第二磨牙，Vertucci Ⅰ型构型占 52.7%。下颌磨牙中，近中根的变异性较高。最常见的是存在 2 个根管，第一和第二磨牙均为 Vertucci Ⅱ型。在远中根中，两种磨牙最常见的构型均为 Vertucci Ⅰ型。
上颌磨牙融合根的比例较高。下颌磨牙近中根的 Vertucci Ⅱ型构型比 Vertucci Ⅳ型更常见，上颌磨牙的近颊根也是如此。下颌第一磨牙近中根的第 3 个根管（6.7%）高于预期。
