Orofacial Pain Program Section of Oral Medicine Oral Pathology and Orofacial Pain University of California Los Angeles School of Dentistry, Los Angeles, California, USA.
Department of Endodontics School of Dentistry Ardabil University of Medical Science, Ardabil Po. Code 5618985991, Iran.
Biomed Res Int. 2024 Jul 31;2024:9969860. doi: 10.1155/2024/9969860. eCollection 2024.
While root canal anatomy in Middle Eastern populations is well-studied, research on isthmi in mandibular permanent teeth from this region is limited. This retrospective study used cone-beam computed tomography (CBCT) to examine isthmi prevalence and location, as well as root canal morphologies (per Vertucci's classification) in mandibular permanent teeth from a subpopulation in Ardabil, Iran. The study is aimed at enhancing our understanding of dental anatomical variations in Middle Eastern populations. A total of 3566 teeth from 384 CBCT scans were evaluated in this retrospective study. Mandibular teeth were evaluated on sagittal, coronal, and axial sections regarding the presence of isthmus and root morphology (Vertucci's classification). CBCT scans of 197 males (51.3%) and 187 females (48.7%) were evaluated, with a mean age of 41.1 ± 11.4 years. Isthmi were most prevalent in molar mesial roots, typically located in the middle third for anterior teeth and first premolars and cervical third for posterior teeth. While gender did not play a significant role, the presence of an isthmus in the mesial root of the left second molars was associated with a younger mean patient age ( < 0.05). Root morphology varied across tooth types. Central and lateral incisors predominantly showed Vertucci's Types I and III. Canines and premolars were mostly Type I, with some variation. Molar mesial roots frequently exhibited Types IV and II, while distal roots were predominantly Type I. Statistically significant differences were found between morphology and gender in the first left premolar (Type I more common in women; Type V in men; < 0.001) and in the right canine (Type I more prevalent in men; Types III and V more prevalent in women; < 0.001). The results revealed wide variations in root canal morphology and a relatively high prevalence of isthmi in the study population. Our findings suggest a potential difference in tooth anatomy based on sex and a relationship between age and the presence of isthmi.
虽然中东人群的根管解剖结构已经得到了充分研究，但关于该地区下颌恒磨牙牙本质峡部的研究却很有限。本回顾性研究使用锥形束计算机断层扫描 (CBCT) 检查了伊朗阿尔达比勒亚种群下颌恒磨牙的牙本质峡部的流行率和位置，以及根管形态（根据 Vertucci 分类）。该研究旨在增进我们对中东人群牙齿解剖结构变异的理解。本回顾性研究共评估了 384 个 CBCT 扫描中的 3566 颗牙齿。对下颌牙齿进行矢状、冠状和轴位评估，以确定牙本质峡部和根形态（Vertucci 分类）的存在。评估了 197 名男性（51.3%）和 187 名女性（48.7%）的 CBCT 扫描，平均年龄为 41.1 ± 11.4 岁。牙本质峡部在磨牙近中根最为常见，通常位于前牙和第一前磨牙的中三分之一和后牙的颈三分之一。虽然性别没有显著作用，但左侧第二磨牙近中根的牙本质峡部的存在与患者年龄较小有关（<0.05）。根形态因牙齿类型而异。中切牙和侧切牙主要显示 Vertucci 类型 I 和 III。尖牙和前磨牙主要为 I 型，但也有一些变异。磨牙近中根常显示 IV 和 II 型，而远中根主要为 I 型。在左侧第一前磨牙（女性中 I 型更常见；男性中 V 型更常见；<0.001）和右侧尖牙（男性中 I 型更常见；女性中 III 和 V 型更常见；<0.001）中，形态和性别之间存在统计学显著差异。研究结果表明，研究人群的根管形态存在广泛差异，牙本质峡部的发生率相对较高。我们的发现表明，牙齿解剖结构可能因性别而异，并且牙本质峡部的存在与年龄之间存在关系。
