Department of Conservative Dentistry and Endodontics, Nair Hospital Dental College, Mumbai, Maharashtra, India.
Department of Conservative Dentistry and Endodontics, Government Dental College and Hospital, Mumbai, Maharashtra, India.
Clin Oral Investig. 2017 Dec;21(9):2801-2809. doi: 10.1007/s00784-017-2082-6. Epub 2017 Mar 9.
This study aims to investigate the root canal morphology of permanent mandibular second molars of an Indian population in vivo using cone-beam computed tomography (CBCT) images.
CBCT images (n = 983; males = 489, females = 494) of untreated, completely developed permanent mandibular second molar teeth were examined. CBCT scans were acquired as part of diagnosis and treatment planning for treatments unrelated to the present study. The number of roots and root canals were recorded. Canal configuration was classified based on Vertucci's and Fan's classifications.
The most common configuration was two-root (79.35%) and three-root canals (53.50%). The incidence of three-rooted molars was 7.53%, whereas 13.12% of the studied teeth studied have fused roots with C-shaped canals. The predominant canal morphology in the mesial roots was Vertucci's type IV (45.17%), followed by type II (32.55%), type I (7.23%), type V (1.02%), and type III (0.91%). The distal root in contrast showed type I (61.14%) as the predominant canal configuration, followed by type II (18.21%) and type IV (7.53%). The incidence of three-rooted molars was higher in males (n = 55; 5.59%) than in females (n = 19; 1.94%) (p < 0.01). The canals in the extra roots exhibited type I (100%) root canal morphology. In teeth with C-shaped root canal (13.12%), the variations in the coronal, middle, and apical third ranged from C1 to C4.
Root canal systems of the mesial roots of mandibular second molars of the study population demonstrated a high degree of variability. While three roots were rare, there was a sexual predisposition. Fused roots with C-shaped canals were rare and demonstrated significant variations from the coronal to apical third.
Root canal morphology can demonstrate variations based on race and sex of patients. Clinicians must always consider the possible variations to ensure successful endodontic treatment.
本研究旨在通过锥形束 CT（CBCT）图像对印度人群未治疗的完全发育的下颌第二磨牙的根管形态进行研究。
检查了 983 名（男性 489 名，女性 494 名）未接受治疗的完全发育的下颌第二磨牙的 CBCT 图像。CBCT 扫描是作为与本研究无关的治疗的诊断和治疗计划的一部分获得的。记录了根和根管的数量。根据 Vertucci 和 Fan 的分类法对根管形态进行分类。
最常见的形态是双根（79.35%）和三根根管（53.50%）。三根管牙的发生率为 7.53%，而研究中 13.12%的牙齿有融合根伴 C 形根管。近中根的主要根管形态为 Vertucci 型 IV（45.17%），其次为 II 型（32.55%）、I 型（7.23%）、V 型（1.02%）和 III 型（0.91%）。相比之下，远中根以 I 型（61.14%）为主导根管形态，其次为 II 型（18.21%）和 IV 型（7.53%）。男性（n=55；5.59%）三根管牙的发生率高于女性（n=19；1.94%）（p<0.01）。额外根管的根管形态均为 I 型（100%）。在 C 形根管（13.12%）的牙齿中，冠、中、根尖三分之一的变异从 C1 到 C4。
研究人群下颌第二磨牙近中根的根管系统表现出高度的可变性。虽然三根管很少见，但存在性别倾向。融合根伴 C 形根管很少见，从冠部到根尖部有明显的变化。
根管形态可根据患者的种族和性别而有所不同。临床医生必须始终考虑可能的变化，以确保根管治疗的成功。
