Journal of Shandong University (Health Sciences) ›› 2018, Vol. 56 ›› Issue (2): 56-61.doi: 10.6040/j.issn.1671-7554.0.2017.826

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C-shaped root canal in mandibular posterior teeth evaluated by cone-beam computed tomography

ZHANG Jing1, YANG Xinghua2, LI Jianhua1, GE Tangna3, ZHANG Shucun4, XIONG Shijiang1   

  1. 1. VIP Department, Hospital of Stomatology, Shandong University, Jinan 250012, Shandong, China;
    2. Shandong Provincial Key Laboratory of Oral Biomedicine, Jinan 250012, Shandong, China;
    3. Department of Endodontics, Hospital of Stomatology, Shandong University, Jinan 250012, Shandong, China;
    4. Department of Endodontics, Chengxi Branch of Hospital of Stomatology, Shandong University, Jinan 250000, Shandong, China
  • Published:2022-09-28

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Abstract: Objective To evaluate the anatomical features of C-shaped canal system in mandibular posterior teeth using cone-beam computed tomography(CBCT)in order to provide imaging information for root canal therapy. Methods A total of 2 603 mandibular posterior teeth in 350 people were observed with CBCT. The incidence of C-shaped root canal was calculated, which was then checked with Fisher exact probability test in different age groups, and with Chi-square test in different gender and tooth position groups. Results (1) The incidence of C-shaped root canal was 2.60%, 0.00%, 0.16% and 31.65% among mandibular first premolars, second premolars, first molars and second molars. (2) In mandibular first premolar, the most common type of canal configuration was C4 in the coronal, followed by C3a in the middle and C4 in the apical. In mandibular second molar, the most common type was C1 in the coronal, followed by C2 in the middle and C3 in the apical. The deep longitudinal ditch of root surface appeared in the mesiolingual side(55.56%)of mandibular premolars and in the lingual side(97.00%)of second molars. (3) There were no significant difference in mandibular first premolars and second molars among different groups of teeth position and gender(P>0.05). Among different age groups, no significant difference was observed in mandibular first premolars(P>0.05), while in second molars, people aged 20-30 years and ≤20 years were more prone to have C-shaped root canal(P<0.001). Conclusion The C-shaped root canals in human mandibular posterior molars have various shapes, often occurring in the second molars, followed by the first premolars, and rarely occurring in the second premolars and first molars.

Key words: Mandibular posterior teeth, C-shaped root canal, Cone-beam computed tomography, Anatomic morphology, Incidence rate

CLC Number: 

  • R781
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