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CC BY-NC-ND 4.0 · Eur J Dent 2016; 10(04): 529-535
DOI: 10.4103/1305-7456.195175
Original Article
Dental Investigation Society

Prevalence of C-shaped mandibular molars in the Portuguese population evaluated by cone-beam computed tomography

Jorge N. R. Martins
1   Department of Endodontics, Implantology Institute, Lisbon, Portugal
,
António Mata
2   Department of Biology, New York University, New York, USA
3   Department of Oral Biology, School of Dental Medicine, Lisbon University, Lisbon, Portugal
4   Oral Biology and Biochemistry Group, Biomedical and Oral Sciences Research Unit (FCT Unit 4062)- Evidence Based Dentistry Center, Lisbon University, Lisbon, Portugal
,
Duarte Marques
4   Oral Biology and Biochemistry Group, Biomedical and Oral Sciences Research Unit (FCT Unit 4062)- Evidence Based Dentistry Center, Lisbon University, Lisbon, Portugal
5   Department of Anatomy and Physiology, School of Dental Medicine, Lisbon University, Lisbon, Portugal
,
João Caramês
6   Department of Implantology, School of Dental Medicine, Lisbon University, Lisbon, Portugal
› Author Affiliations
Further Information

Publication History

Publication Date:
24 September 2019 (online)

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ABSTRACT

Objective: The purpose of this study was to evaluate the prevalence of first and second C-shaped mandibular molars in a Western European population of Portuguese Caucasians. Materials and Methods: Patients having both routine panoramic radiograph and presurgical cone-beam computed tomography (CBCT) exams were selected. The CBCT examination was performed at five different axial levels and the mandibular molars were classified as C-shape according to the Fan criteria. Differences between genders, age groups, left and right side, type of tooth, and root concavity side were determined. The molars were classified as nonfused roots (NFRI–II), FRI–III, or single root with single canal (SS) groups, using the panoramic radiograph. The prevalence of C-shaped anatomy was calculated to each group. Results: A total of 1783 teeth (695 first molars and 1088 second molars) from 792 patients were included in the study. The prevalence of C-shaped configurations was 0.6% and 8.5% to mandibular first and second molars, respectively. The differences between gender, teeth, and root concavity direction were considered statistically significant (P < 0.05). The FR had a significantly higher rate of C-shapes when compared to NFR (P < 0.05). Intrarater reliability was 93.6%. Conclusions: The FR radiographic appearance may be considered a predictor of this anatomy. Second mandibular molars and females had a higher incidence ratio. Apparently, the mandibular C-shaped anatomy is more common in the population of this study than that has been previously reported for the European population.

Key words:

Cone-beam computed tomography - C-shaped root canal - dental morphology - mandibular molars - panoramic radiography
 

  • REFERENCES

  • 1 Cooke 3rd HG, Cox FL. C-shaped canal configurations in mandibular molars. J Am Dent Assoc 1979; 99: 836-9
    CrossrefPubMedGoogle Scholar
  • 2 Kato A, Ziegler A, Higuchi N, Nakata K, Nakamura H, Ohno N. Aetiology, incidence and morphology of the C-shaped root canal system and its impact on clinical endodontics. Int Endod J 2014; 47: 1012-33
    CrossrefPubMedGoogle Scholar
  • 3 Jafarzadeh H, Wu YN. The C-shaped root canal configuration: A review. J Endod 2007; 33: 517-23
    CrossrefPubMedGoogle Scholar
  • 4 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
    CrossrefPubMedGoogle Scholar
  • 5 Weine FS. The C-shaped mandibular second molar: Incidence and other considerations. Members of the Arizona Endodontic Association. J Endod 1998; 24: 372-375
    CrossrefPubMedGoogle Scholar
  • 6 Manning SA. Root canal anatomy of mandibular second molars. Part II. C-shaped canals. Int Endod J 1990; 23: 40-5
    CrossrefPubMedGoogle Scholar
  • 7 Fan B, Cheung GS, Fan M, Gutmann JL, Bian Z. C-shaped canal system in mandibular second molars: Part I – Anatomical features. J Endod 2004; 30: 899-903
    CrossrefPubMedGoogle Scholar
  • 8 Melton DC, Krell KV, Fuller MW. Anatomical and histological features of C-shaped canals in mandibular second molars. J Endod 1991; 17: 384-8
    CrossrefPubMedGoogle Scholar
  • 9 Sinanoglu A, Helvacioglu-Yigit D. Analysis of C-shaped canals by panoramic radiography and cone-beam computed tomography: Root-type specificity by longitudinal distribution. J Endod 2014; 40: 917-21
    CrossrefPubMedGoogle Scholar
  • 10 Fan B, Cheung GS, Fan M, Gutmann JL, Fan W. C-shaped canal system in mandibular second molars: Part II – Radiographic features. J Endod 2004; 30: 904-8
    CrossrefPubMedGoogle Scholar
  • 11 Nakayama A, Toda Y. Clinical observation of gutter shaped root canal. Kokubyo Gakkai Zasshi 1941; 15: 118-23
    CrossrefGoogle Scholar
  • 12 Gulabivala K, Opasanon A, Ng YL, Alavi A. Root and canal morphology of Thai mandibular molars. Int Endod J 2002; 35: 56-62
    CrossrefPubMedGoogle Scholar
  • 13 Lambrianidis T, Lyroudia K, Pandelidou O, Nicolaou A. Evaluation of periapical radiographs in the recognition of C-shaped mandibular second molars. Int Endod J 2001; 34: 458-62
    CrossrefPubMedGoogle Scholar
  • 14 Cimilli H, Cimilli T, Mumcu G, Kartal N, Wesselink P. Spiral computed tomographic demonstration of C-shaped canals in mandibular second molars. Dentomaxillofac Radiol 2005; 34: 164-7
    CrossrefPubMedGoogle Scholar
  • 15 Zheng Q, Zhang L, Zhou X, Wang Q, Wang Y, Tang L. et al. C-shaped root canal system in mandibular second molars in a Chinese population evaluated by cone-beam computed tomography. Int Endod J 2011; 44: 857-62
    CrossrefPubMedGoogle Scholar
  • 16 Scarfe WC, Levin MD, Gane D, Farman AG. Use of cone beam computed tomography in endodontics. Int J Dent 2009; 2009: 634567
    PubMedGoogle Scholar
  • 17 Zhang R, Wang H, Tian YY, Yu X, Hu T, Dummer PM. Use of cone-beam computed tomography to evaluate root and canal morphology of mandibular molars in Chinese individuals. Int Endod J 2011; 44: 990-9
    CrossrefPubMedGoogle Scholar
  • 18 Helvacioglu-Yigit D, Sinanoglu A. Use of cone-beam computed tomography to evaluate C-shaped root canal systems in mandibular second molars in a Turkish subpopulation: A retrospective study. Int Endod J 2013; 46: 1032-8
    CrossrefPubMedGoogle Scholar
  • 19 Silva EJ, Nejaim Y, Silva AV, Haiter-Neto F, Cohenca N. Evaluation of root canal configuration of mandibular molars in a Brazilian population by using cone-beam computed tomography: An in vivo study. J Endod 2013; 39: 849-52
    CrossrefPubMedGoogle Scholar
  • 20 Yang ZP, Yang SF, Lin YC, Shay JC, Chi CY. C-shaped root canals in mandibular second molars in a Chinese population. Endod Dent Traumatol 1988; 4: 160-3
    CrossrefPubMedGoogle Scholar
  • 21 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
    CrossrefPubMedGoogle Scholar
  • 22 Park JB, Kim N, Park S, Kim Y, Ko Y. Evaluation of root anatomy of permanent mandibular premolars and molars in a Korean population with cone-beam computed tomography. Eur J Dent 2013; 7: 94-101
    PubMedGoogle Scholar
  • 23 Rahimi S, Shahi S, Lotfi M, Zand V, Abdolrahimi M, Es'haghi R. Root canal configuration and the prevalence of C-shaped canals in mandibular second molars in an Iranian population. J Oral Sci 2008; 50: 9-13
    CrossrefPubMedGoogle Scholar
  • 24 Al-Fouzan KS. C-shaped root canals in mandibular second molars in a Saudi Arabian population. Int Endod J 2002; 35: 499-504
    CrossrefPubMedGoogle Scholar
  • 25 Ahmed HA, Abu-bakr NH, Yahia NA, Ibrahim YE. Root and canal morphology of permanent mandibular molars in a Sudanese population. Int Endod J 2007; 40: 766-71
    CrossrefPubMedGoogle Scholar
  • 26 Nur BG, Ok E, Altunsoy M, Aglarci OS, Colak M, Gungor E. Evaluation of the root and canal morphology of mandibular permanent molars in a south-eastern Turkish population using cone-beam computed tomography. Eur J Dent 2014; 8: 154-9
    Article in Thieme ConnectPubMedGoogle Scholar
  • 27 Nie YK, Baker WZ, Alam MK. The occurrence of C-shaped root canal in Malaysian population. Bangladesh J Med Sci 2013; 12: 286-90
    CrossrefGoogle Scholar