title: The correlation between root canal patterns and interorificial distance in mandibular first molars.
abstract: OBJECTIVE
  The aim of this study was to investigate the relationship of the distance between mesiobuccal (MB) and mesiolingual (ML) orifices (interorificial distances) in the pulp chamber floor and the degree of canal curvature in the mandibular first molars.
  
  
  METHODS
  In this in vitro study, 102 extracted teeth were radiographed in both buccolingual (CV) and mesiodistal (PV) directions and then grouped according to the Vertucci classification. The interorificial distance was measured by the stereomicroscope method.
  
  
  RESULTS
  The interorificial distance was significantly higher in type IV compared to type II (P= .016). In the logistic regression analysis, the increase in the degree of primary canal curvature of the ML in CV was a predictive factor for increase in the primary curvature of ML in PV (P = .01).
  
  
  CONCLUSIONS
  The interorificial distance in the pulp chamber floor and primary curvatures in CV were found to be key factors for evaluation of root canal patterns in PV.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Marmara University, Istanbul, Turkey.
authors.forename: Hale
authors.initials: H
authors.lastname: Cimilli
authors.forename: Gonca
authors.initials: G
authors.lastname: Mumcu
authors.forename: Tan
authors.initials: T
authors.lastname: Cimilli
authors.forename: Nevin
authors.initials: N
authors.lastname: Kartal
authors.forename: Paul
authors.initials: P
authors.lastname: Wesselink
mesh_terms: D000704:Analysis of Variance; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D016015:Logistic Models; D008334:Mandible; D008853:Microscopy; D008963:Molar / Q000033:anatomy & histology*; D009811:Odontometry; D014092:Tooth Root / Q000033:anatomy & histology*