title: A micro-computed tomography study of the root canal morphology of the mandibular first premolar in a population from southwestern China.
abstract: OBJECTIVE
  This study aimed to investigate the root canal morphology of mandibular first premolar teeth in a population from southwestern China by micro-computed tomography (micro-CT).
  
  
  METHODS
  Human mandibular first premolars (115) were selected and prepared for micro-CT analysis with a slice thickness of 30 μm. Details of root canal orifices, canals, accessory canals, apical foramina-apical delta intercanal communication, loops and isthmuses, and mesial invagination were analyzed from reconstructed three-dimensional (3D) images.
  
  
  RESULTS
  Canal patterns categorized according to the classification defined by Vertucci (Endod Top 10:3-29, 2005) as types I (65.2%), III (2.6%), V (22.6%), and VII were identified (0.9%). Accessory canals were present in 35.7% of the samples and were predominantly located in the apical third of the root. A single apical foramen was observed in 50.4% of the samples and two or three foramina in 28.7% and 14.8%, respectively. Apical delta was identified in 6.1% of the samples and the prevalence of intercanal communication and loops was 3.5% and 7%, respectively. Mesial invagination of the root was identified in 27.8% of the samples, the majority of which contained multiple canals.
  
  
  CONCLUSIONS
  The data obtained in this study revealed complex root morphology with high prevalence of multiple canals, more than half of which exhibited type I canal patterns.
  
  
  CONCLUSIONS
  Micro-CT was used as a noninvasive technique for 3D investigation of root canal morphology in the mandibular first premolars of a population from southwestern China. Furthermore, data obtained revealed complex anatomy of various types.
authors: Department of Stomatology, Chinese PLA General Hospital and Postgraduate Military Medical School, Beijing, 100039, China.
authors: Na
authors: N
authors: Liu
authors: Xiangjie
authors: X
authors: Li
authors: Ning
authors: N
authors: Liu
authors: Lijun
authors: L
authors: Ye
authors: Jianping
authors: J
authors: An
authors: Xin
authors: X
authors: Nie
authors: Luchuan
authors: L
authors: Liu
authors: Manjing
authors: M
authors: Deng
mesh_terms: D001641:Bicuspid / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D002681:China; D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible; D055114:X-Ray Microtomography