title: [Cone-beam computed tomography analysis of root canal configuration of 4 674 mandibular anterior teeth].
abstract: OBJECTIVE
  To investigate the root canal configuration of mandibular anterior teeth with cone-beam computed tomography (CBCT).
  
  
  METHODS
  The CBCT imaging data of 866 patients who visited Peking University School of Stomatology from October 2012 to July 2013 were inspected by an endodontist anda radiologists together. A total of 4 674 mandibular anterior teeth were involved. The number of root, root canals and root canal configuration were observed and analyzed statistically (Chi-squared test).
  
  
  RESULTS
  All the mandibular central incisors and lateral incisors were single root, and 0.7% (11/1 542) of canines were double roots. 6.7% (105/1 566) of central incisors, 17.4% (273/1 566) of lateral incisors and 3.0% (46/1 542) of canines had double root canals. The frequency of symmetry of double root canal was 58.7% (37/63) in central incisors, 76.1% (108/142) in lateral incisors and 29.6% (8/27) in canines. The highest frequency of double root canals in different ages was 9.8% (28/287, 31-40 years) in central incisors, 21.5% (61/284, 31-40 years) in lateral incisors and 9.2% (19/207, ≥51 years) in canines. Vertucci type III canal configurations were the most prevalent in mandibular anterior teeth.
  
  
  CONCLUSIONS
  The double root canals are most common in mandibular lateral incisors. The highest incidence of symmetry of double root canal is also observed in mandibular lateral incisors. Vertucci type III canal configurations are the most frequent type in mandibular anterior teeth.
authors.affiliation: Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China; Department of Conservative Dentistry, Beijing Chongwen Hospital of Stomatology, Beijing 100062, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhao
authors.affiliation: Department of Conservative Dentistry, Beijing Chongwen Hospital of Stomatology, Beijing 100062, China.
authors.forename: Ying-tao
authors.initials: YT
authors.lastname: Dong
authors.affiliation: Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Xiao-yan
authors.initials: XY
authors.lastname: Wang
authors.affiliation: Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Zu-hua
authors.initials: ZH
authors.lastname: Wang
authors.affiliation: Department of Radiology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Li
authors.affiliation: Department of Radiology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Mu-qing
authors.initials: MQ
authors.lastname: Liu
authors.affiliation: Department of Radiology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Kai-yuan
authors.initials: KY
authors.lastname: Fu
mesh_terms: D054893:Cone-Beam Computed Tomography; D003786:Dental Pulp Cavity; D006801:Humans; D007180:Incisor; D008334:Mandible; D014092:Tooth Root