Department of Endodontics, Faculty of Dentistry, İstanbul Aydın University, Küçükçekmece, İstanbul, 34295, Turkey.
Department of Endodontics, Faculty of Dentistry, İstanbul Aydın University, Küçükçekmece, İstanbul, 34295, Turkey.
Arch Oral Biol. 2019 Nov;107:104517. doi: 10.1016/j.archoralbio.2019.104517. Epub 2019 Aug 10.
To conduct an in vivo evaluation of prevalence of root canal configurations, lengths of C-shaped canals, prevalence and depths of radicular grooves (RGs), in mandibular first and second premolars in a Turkish subpopulation using cone beam computed tomography (CBCT).
CBCT images of 327 first and 264 second premolars were included. Canal configurations, locations, lengths, and types of C-shaped canals, and RGs were evaluated on CBCT images. Data were statistically analyzed (P < 0.05).
First and second premolars were classified as follows: type I, (83.8%, 97.72%); type V, (12.22%, 0.76%); type III, (3.06%, 0.76%); and other types. RGs were exhibited by 14.68% of first and 2.27% of second premolars (P < 0.05). Incidence of complex canals (types III, V and other types, 89.8%) in first premolars with RGs was significantly higher versuswithout RGs (P < 0.05). C-shaped configuration was exhibited by 4.58% of first (80% semilunar-type), and 1.13% of second premolars (P < 0.05). All first premolars with C-shaped canals showed RGs and complex canals.
Complex canals and RGs frequently co-exist in mandibular premolars. C-shaped canals are not common in mandibular premolars, and mostly located in middle thirds. Type V is the most prevalent complex canal configuration in first premolars, and frequently associated with a C-shaped semilunar-type anatomy.
利用锥形束计算机断层扫描（CBCT）对土耳其人群下颌第一和第二前磨牙的根管形态、C 型根管长度、根裂（RGs）的发生率和深度进行体内评估。
纳入 327 颗第一前磨牙和 264 颗第二前磨牙的 CBCT 图像。在 CBCT 图像上评估根管形态、位置、长度和 C 型根管类型以及 RGs。对数据进行统计学分析（P<0.05）。
第一和第二前磨牙分为以下几类：I 型（83.8%，97.72%）；V 型（12.22%，0.76%）；III 型（3.06%，0.76%）和其他类型。第一前磨牙有 14.68%和第二前磨牙有 2.27%出现 RGs（P<0.05）。有 RGs 的第一前磨牙中复杂根管（III 型、V 型和其他类型，89.8%）的发生率明显高于无 RGs 的（P<0.05）。第一前磨牙中有 4.58%呈现 C 型（80%呈半月形），第二前磨牙中有 1.13%呈现 C 型（P<0.05）。所有有 C 型根管的第一前磨牙都有 RGs 和复杂根管。
下颌前磨牙中常同时存在复杂根管和 RGs。下颌前磨牙中 C 型根管不常见，大多位于中三分之一。V 型是第一前磨牙中最常见的复杂根管形态，常与 C 型半月形解剖结构相关。
