title: Evaluation of root morphology and root canal configuration of premolars in the Turkish individuals using cone beam computed tomography.
abstract: OBJECTIVE
  The aim of the present study is to assess the root and root canal morphology of maxillary and mandibular premolars in a Turkish population by using cone beam computed tomography (CBCT).
  
  
  METHODS
  In this study, CBCT images of 2134 premolars (987 maxillary, 1147 mandibular) were obtained from 404 patients. Details of gender, age, number of roots and canals, and canal configuration in each root were recorded. The canal configuration was classified and evaluated according to Vertucci's criteria.
  
  
  RESULTS
  The majority of maxillary premolars had two separate roots; although, three roots were identified in 1% of maxillary first premolars. However, most of the mandibular premolars had a single root. The two canals (69.9%) and type I (62.6%) and type II (34.1%) configuration for upper first premolar, one canal (82.1%) and type I (77.6%) canal configuration for second premolar was the most prevalent root canal frequency. The most prevalent root canal frequency was the one canal (96.2%) and type I (94.2%) and type V (3.2%) configuration for mandibular first premolar, one canal (98.9%) and type I (98.9%) canal configuration for second premolar. There was no difference in the root canal configurations and the numbers of canals between the left and the right side of both females and males (P > 0.05).
  
  
  CONCLUSIONS
  Recognition of morphology and anatomy of the root canal system is one of the most important factors for successful endodontic treatment. Preoperative CBCT examination allows determination of root canal configuration of premolar teeth and helps clinicians in root canal treatment.
authors.affiliation: Department of Oral and Maxillofacial Radiology, University of Erciyes, Kayseri, Turkiye.
authors.forename: Duygu Goller
authors.initials: DG
authors.lastname: Bulut
authors.affiliation: Department of Oral and Maxillofacial Radiology, University of Erciyes, Kayseri, Turkiye.
authors.forename: Emre
authors.initials: E
authors.lastname: Kose
authors.affiliation: Department of Oral and Maxillofacial Radiology, University of Erciyes, Kayseri, Turkiye.
authors.forename: Gozde
authors.initials: G
authors.lastname: Ozcan
authors.affiliation: Department of Oral and Maxillofacial Radiology, University of Erciyes, Kayseri, Turkiye.
authors.forename: Ahmet Ercan
authors.initials: AE
authors.lastname: Sekerci
authors.affiliation: Department of Oral and Maxillofacial Radiology, University of Erciyes, Kayseri, Turkiye.
authors.forename: Emin Murat
authors.initials: EM
authors.lastname: Canger
authors.affiliation: Department of Oral and Maxillofacial Radiology, University of Erciyes, Kayseri, Turkiye.
authors.forename: Yıldıray
authors.initials: Y
authors.lastname: Sisman
keywords: Cone beam computed tomography; mandibular premolars; maxillary premolars; root canal anatomy; root canal morphology