title: A micro-computed tomography study of the relationship between radicular grooves and root canal morphology in mandibular first premolars.
abstract: OBJECTIVE
  This study aims to explore the correlation between radicular grooves and root canal types by quantitatively detecting the radicular groove of mandibular first premolars using micro-computed tomography.
  
  
  METHODS
  A total of 127 mandibular first premolars were scanned by micro-computed tomography, and 52 teeth with radicular grooves were identified. Details of root canal type and groove length, depth, and location were analyzed from three-dimensional images.
  
  
  RESULTS
  A total of 40.9 % (52/127) of teeth had radicular grooves. Most of the grooves (69.5 %) were located on the mesial surface of the root. The prevalence of radicular grooves in single canals (17.4 %; 15/86) was lower than that in multiple and complex canals (90.2 %; 37/41); this difference was statistically significant (P < 0.001). The mean length and depth of radicular groove in type V (7.7 ± 2.16 and 0.87 ± 0.39 mm, respectively) and other types of canals (6.91 ± 2.67 and 0.63 ± 0.27 mm, respectively) were significantly longer and deeper than type I canals (6.06 ± 2.12 and 0.43 ± 0.14 mm, respectively).
  
  
  CONCLUSIONS
  Multiple and complex canals had a higher incidence of radicular grooves and more complicated root morphology than single and simple canals. Therefore, the anatomy of radicular grooves may influence root canal morphology.
  
  
  CONCLUSIONS
  The existence of a radicular groove is closely related to root anatomy and root canal morphology. Anatomical complexity increases the difficulty of root canal treatment and periodontal therapy; therefore, the current data may provide clinicians with a more thorough understanding of the relationship between radicular grooves and root canal morphology.
authors.affiliation: Department of Stomatology, Institute of Surgery Research, Daping Hospital, The Third Military Medical University, 10# Changjiangzhilu, Daping, Yuzhong District, Chongqing, 400042, People's Republic of China.
authors.forename: Junhong
authors.initials: J
authors.lastname: Chen
authors.forename: Xiangjie
authors.initials: X
authors.lastname: Li
authors.forename: Yang
authors.initials: Y
authors.lastname: Su
authors.forename: Dan
authors.initials: D
authors.lastname: Zhang
authors.forename: Xiujie
authors.initials: X
authors.lastname: Wen
authors.forename: Xin
authors.initials: X
authors.lastname: Nie
authors.forename: Jianping
authors.initials: J
authors.lastname: An
authors.forename: Luchuan
authors.initials: L
authors.lastname: Liu
authors.forename: Manjing
authors.initials: M
authors.lastname: Deng
mesh_terms: D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D008334:Mandible / Q000033:anatomy & histology*; D055114:X-Ray Microtomography / Q000379:methods*
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