Dept. of Stomatology, Peking University International Hospital, Beijing 102206, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2024 Jun 1;42(3):329-333. doi: 10.7518/hxkq.2024.2023348.
This retrospective study explored the incidence of independent distal-lingual root (DLR) in mandibular first molars and the morphologic features of distal furcations through cone beam computed tomography (CBCT) in Beijing population.
A total of 401 CBCT images of both mandibular first molars existed were included. The sex of the patients, the incidence of DLR, the distal root trunk length (DRT), the locations of distal furcation entrance (DFE), and the separation angle of distal furcation (ADF) were recorded.
The incidence rates of DLR were 33.2% on the subject level and 26.8% on the tooth level. The incidence of DLR was not different between genders but was higher on the right sides. The DRT values were 4.15 mm±1.02 mm. The ADF was 65.56°±11.56°. The DFE was located lingually, and 97.2% DFE was located more apically than buccal/lingual furcations.
A high incidence of DLR was found in the Beijing population. The DRT was longer than buccal and lingual sites. The DFE was located lingually with a wide separation. Understanding the morphological features of distal furcation can help clinicians to make proper treatment plans.
本回顾性研究通过锥形束 CT（CBCT）探讨了北京人群下颌第一磨牙中独立远中舌侧根（DLR）的发生率以及远中分叉的形态特征。
共纳入 401 例下颌第一磨牙的 CBCT 图像。记录患者性别、DLR 发生率、远中根干长度（DRT）、远中分叉入口位置（DFE）和远中分叉分离角（ADF）。
在个体水平上，DLR 的发生率为 33.2%，在牙水平上为 26.8%。DLR 的发生率在性别之间无差异，但在右侧较高。DRT 值为 4.15mm±1.02mm。ADF 为 65.56°±11.56°。DFE 位于舌侧，97.2%的 DFE 位于颊/舌分叉的根尖上方。
在北京人群中发现 DLR 的发生率较高。DRT 长于颊侧和舌侧。DFE 位于舌侧，分离度较大。了解远中分叉的形态特征有助于临床医生制定适当的治疗计划。
