Journal of the California Dental Association (Dec 2023)

Internal Morphological Variations of 150 Lower Premolars: Three-Dimensional Multianalytical Study

  • Pedro Torres Dantas,
  • Thaís Martins de Souza,
  • Renata Perez Vianna Silva,
  • Amanda Assumpção Marques,
  • Cristine da Silva Furtado Amaral,
  • Renata Costa Val Rodrigues,
  • Fabiano Luiz Heggendorn,
  • Sabrina de Castro Brasil

DOI
https://doi.org/10.1080/19424396.2023.2242575
Journal volume & issue
Vol. 51, no. 1

Abstract

Read online

ABSTRACTAim The aim of this study was to investigate variations in the root canal morphology of human mandibular premolars using micro-computed tomography (micro-CT).Methods Three-dimensional images of 150 extract mandibular premolars were obtained using micro-CT. The root canal configurations were analyzed using Vertucci´s classification, volume and area of apical segment and considering the total canal length. The root canal length and apical diameter were two-dimensionally analyzed.Results The teeth were classified in the following Vertucci´s types: I (67.3%), V (16.7%), III (10%), IV (2.7%), VII (1.3%), and II (0.7%) with 1,3% not classifiable. The mean for the total length was 12.63 ± 2.20. The mean volume was 7.64 ± 5.68 mm3 for the total length and 0.89 ± 1.34 mm3 for the apical segment (5 mm). The area at 5 mm from the apical foramen was 10.57 ± 4.33 mm3 and the apical diameter was 1.68 ± 0.72 mm. Apical deltas were found in 4.7%. Lateral canals were observed in 8% and secondary in 14.7% of the teeth, with 4.7% having both a lateral canal and a secondary canal. Branches were found in 44% of the elements. Two-dimensional data showed that the mean of the total lengh and the apical diameters of the canals were 12.63 mm and 1.68 mm, respectively.Conclusion There was a high prevalence of complex morphology through the canal and variations at the apical critical zone in mandibular premolars.

Keywords