C-shaped root canal system in mandibular 2nd molars in Korean people evaluated by cone beam computed tomography

Cone beam computed tomography를 이용하여 한국인 제2하악 대구치에서 C형 근관계에 대한 평가

  • Received : 2015.10.27
  • Accepted : 2016.03.19
  • Published : 2016.03.31


Purpose: To determine the anatomical characteristic of C-shaped canal systems in Korean mandibular 2nd molars by cone beam computed tomography (CBCT). Materials and Methods: The 824 CBCT images were evaluated. These patients were taken CBCT for the diagnosis and treatment of dental implantation on 2013. The 711 mandibular 2nd molars were examined. The configuration of root canal systems were classified according to modified Melton's classifications. Results: Of the 711 mandibular 2nd molars, 21.5% had C-shaped canal systems. This prevalence did not differ with tooth position. Most of the C-shaped canals with bilateral molars were symmetrical. Of the C-shaped canal, the most common configuration Type were Melton's Type I (89%) in the orifice level and Melton's III (83.8%) in the apical level. The prevalence of C-shaped canal was higher in female (25%) than male (13.9%) (P < 0.05). Conclusion: A high prevalence of C-shaped canals were observed in Korean mandibular 2nd molars. For successful C-shaped root canal treatment, the comprehension of root canal systems was important.


C-shaped canal;cone beam computed tomography;Korean;mandibulat 2nd molar


  1. Manning SA. Root canal anatomy of mandibular second molars. Part II. C-shaped canals. Int Endod J 1990;23:40-5.
  2. Sikri VK, Sikri P. Mandibular premolars: aberrations in pulp space morphology. Indian J Dent Res 1994;5:9-14.
  3. Wang Y, Guo J, Yang HB, Han X, Yu Y. Incidence of C-shaped root canal systems in mandibular second molars in the native Chinese population by analysis of clinical methods. Int J Oral Sci 2012;4:161-5.
  4. Cooke HG 3rd, Cox FL. C-shaped canal configurations in mandibular molars. J Am Dent Assoc 1979;99:836-9.
  5. Melton DC, Krell KV, Fuller MW. Anatomical and histological features of C-shaped canals in mandibular second molars. J Endod 1991;17:384-8.
  6. Fan B, Cheung GS, Fan M, Gutmann JL, Bian Z. Cshaped canal system in mandibular second molars: part I-anatomical features. J Endod 2004;30:899-903.
  7. Fan B, Cheung GS, Fan M, Gutmann JL, Fan W. Cshaped canal system in mandibular second molars: part II-radiographic features. J Endod 2004;30:904-8.
  8. Patel S, Dawood A, Ford TP, Whaites E. The potential applications of cone beam computed tomography in the management of endodontic problems. Int Endod J 2007;40:818-30.
  9. Seo DG, Gu Y, Yi YA, Lee SJ, Jeong JS, Lee Y, Chang SW, Lee JK, Park W, Kim KD, Kum KY. A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography. Int Endod J 2012;45:807-14.
  10. Seo MS, Park DS. C-shaped root canals of mandibular second molars in a Korean population: clinical observation and in vitro analysis. Int Endod J 2004;37:139-44.
  11. Yang ZP, Yang SF, Lin YC, Shay JC, Chi CY. Cshaped root canals in mandibular second molars in a Chinese population. Endod Dent Traumatol 1988;4:160-3.
  12. Jin GC, Lee SJ, Roh BD. Anatomical study of C-shaped canals in mandibular second molars by analysis of computed tomography. J Endod 2006;32:10-3.
  13. Sabala CL, Benenati FW, Neas BR. Bilateral root or root canal aberrations in a dental school patient population. J Endod 1994;20:38-42.

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