Prevalence and morphometric analysis of three-rooted mandibular first molars in a Brazilian subpopulation

Abstract

The knowledge of the internal anatomy of three-rooted mandibular molars may help clinicians to diagnose and plan the root canal treatment in order to provide adequate therapy when this variation is present.Objectives:To determine the prevalence of three-rooted mandibular molars in a Brazilian population using cone beam computed tomography (CBCT) and to analyze the anatomy of mandibular first molars with three roots through micro-CT.Material and Methods:CBCT images of 116 patients were reviewed to determine the prevalence of three-rooted first mandibular molars in a Brazilian subpopulation. Furthermore, with the use of micro-CT, 55 extracted three-rooted mandibular first molars were scanned and reconstructed to assess root length, distance between canal orifices, apical diameter, Vertucci's classification, presence of apical delta, number of foramina and furcations, lateral and accessory canals. The distance between the orifice on the pulp chamber floor and the beginning of the curvature and the angle of canal curvature were analyzed in the distolingual root. Data were compared using the Kruskal-Wallis test (α=0.05).Results:The prevalence of three-rooted mandibular first molars was of 2.58%. Mesial roots showed complex distribution of the root canal system in comparison to the distal roots. The median of major diameters of mesiobuccal, mesiolingual and single mesial canals were: 0.34, 0.41 and 0.60 mm, respectively. The higher values of major diameters were found in the distobuccal canals (0.56 mm) and the lower diameters in the distolingual canals (0.29 mm). The lowest orifice distance was found between the mesial canals (MB-ML) and the highest distance between the distal root canals (DB-DL). Almost all distal roots had one root canal and one apical foramen with few accessory canals.Conclusions:Distolingual root generally has short length, severe curvature and a single root canal with low apical diameter.

Three-Rooted Mandibular First Molars in a Saudi Arabian Population: A CBCT Study

“…Iranian population (3.1%) [15], but less than the frequency reported with the use of CBCT technique in Taiwanese population whose results were 33.3% [16] and 29% [17]. In contrast to this, our observation was higher than the frequency noted in Turkish -2.06% [18] and 2.58% [19] and in Brazilian population (2.6%) [20] using CBCT. As compared to our study, a higher values was noted by the previous studies carried out in Saudi Arabian population by conventional methods [10,11], this discrepancy may be seen due to change in sample size and the different methodology employed in these studies.…”

Prevalence and Characteristics of Three-rooted Mandibular Molars in Saudi Population: A Retrospective Radiographic Analysis

“…Nonetheless, there was disagreement observed in prior CBCT studies 20,23-25 used for the identification of three-rooted PFM in the mandibular arch. However, two studies 20,23 showed the highest occurrence (33.3% and 29%) whereas another very low occurrence was noted in the other two studies was 2.6% 24 and 2.5%, 25 respectively. Furthermore, CBCT is considered an ideal diagnostic imaging modality in the field of modern dental practice including endodontics.…”

Radix entomolaris: relatos de série de casos / Radix entomolaris: case series reports

“…No primeiro caso clínico apresentado, foi observado a necessidade de se estender o acesso para a região disto-lingual para facilitar o encontro do radix entomolaris. Fato este que, vai de encontro com os achados literários que evidenciam uma maior probabilidade de esta raiz supranumerária está localizada nesta região (RODRIGUES et al, 2016). No terceiro caso a variação anatômica foi possível ser encontrada devido a uma correta análise radiográfica, enquanto que no segundo a elevada destruição coronária proporcionou o achado dessa raiz extra.…”