title: [Study of the root canal characteristics of mandibular central incisors in 150 patients using cone-beam computed tomography].
abstract: OBJECTIVE
  To investigate the root canal characteristics of mandibular central incisors using a cone-beam computed tomography (CBCT) technique.
  
  
  METHODS
  One hundred and fifty patients (79 males and 71 females) receiving CBCT scan at Shanghai Ninth People's Hospital were recruited into this study. A total of 295 image samples of mandibular central incisors were obtained and analyzed in terms of the number and type of root canals.
  
  
  RESULTS
  The majority of mandibular central incisors had a single canal (61% possessed a Type I canal system). Although 39% of the roots possessed two canals, only 8.8%had two separate apical foramina.
  
  
  CONCLUSIONS
  The prevalence of two canals of mandibular central incisors in this case series was 39% and is within the range reported by previous studies on case series of different racial origin.
authors.affiliation: Department of General Dentistry, Ninth People's Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine; Shanghai Key Laboratory of Stomatology. Shanghai 200011, China.E-mail:muduproject@aliyun.com.
authors.forename: Lu-dong
authors.initials: LD
authors.lastname: Zhang
authors.forename: Hai-ning
authors.initials: HN
authors.lastname: Wang
authors.forename: Ya-qin
authors.initials: YQ
authors.lastname: Zhu
mesh_terms: D002681:China; D054893:Cone-Beam Computed Tomography; D003786:Dental Pulp Cavity; D005260:Female; D006801:Humans; D007180:Incisor; D008297:Male; D008334:Mandible; D012390:Root Canal Therapy; D014092:Tooth Root