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Root canal morphology of primary molars: a micro-computed tomography study

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European Archives of Paediatric Dentistry Aims and scope Submit manuscript

Abstract

Aim

This was to investigate the root canal morphology of primary molar teeth using micro-computed tomography.

Methods

Primary maxillary (n = 20) and mandibular (n = 20) molars were scanned at a resolution of 16.7 μm and analysed regarding the number, location, volume, area, structured model index (SMI), area, roundness, diameters, and length of canals, as well as the thickness of dentine in the apical third. Data were statistically compared by using paired-sample t test, independent sample t test, and one-way analysis of variance with significance level set as 5 %.

Results

Overall, no statistical differences were found between the canals with respect to length, SMI, dentine thickness, area, roundness, and diameter (p > 0.05). A double canal system was observed in the mesial and mesio-buccal roots of the mandibular and maxillary molars, respectively. The thickness in the internal aspect of the roots was lower than in the external aspect. Cross-sectional evaluation of the roots in the apical third showed flat-shaped canals in the mandibular molars and ribbon- and oval-shaped canals in the maxillary molars.

Conclusions

External and internal anatomy of the primary first molars closely resemble the primary second molars. The reported data may help clinicians to obtain a thorough understanding of the morphological variations of root canals in primary molars to overcome problems related to shaping and cleaning procedures, allowing appropriate management strategies for root canal treatment.

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References

  • Aminabadi NA, Farahani RM, Gajan EB. Study of root canal accessibility in human primary molars. J Oral Sci. 2008;50:69–74.

    Article  PubMed  Google Scholar 

  • Badger GR. Three-rooted mandibular first primary molar. Oral Surg Oral Med Oral Pathol. 1982;53:547.

    Article  PubMed  Google Scholar 

  • Bagherian A, Kalhori KA, Sadeghi M, Mirhosseini F, Parisay I. An in vitro study of root and canal morphology of human deciduous molars in an Iranian population. J Oral Sci. 2010;52:397–403.

    Article  PubMed  Google Scholar 

  • Beltrame AP, Triches TC, Sartori N, Bolan M. Electronic determination of root canal working length in primary molar teeth: an in vivo and ex vivo study. Int Endod J. 2011;44:402–6.

    Article  PubMed  Google Scholar 

  • Caceda JH, Creath CJ, Thomas JP, Thornton JB. Unilateral fusion of primary molars with the presence of a succedaneous supernumerary tooth: case report. Pediatr Dent. 1994;16:53–5.

    PubMed  Google Scholar 

  • Cleghorn BM, Boorberg NB, Christie WH. Primary human teeth and their root canal systems. Endod Topics. 2012;23:6–33.

    Article  Google Scholar 

  • Eden EK, Koca H, Sen BH. Dens invaginatus in a primary molar: report of case. ASDC J Dent Child. 2002;69:49–53.

    PubMed  Google Scholar 

  • Falk WV, Bowers DF. Bilateral three-rooted mandibular first primary molars: report of case. ASDC J Dent Child. 1983;50:136–7.

    PubMed  Google Scholar 

  • Fornari VJ, Silva-Sousa YT, Vanni JR, et al. Histological evaluation of the effectiveness of increased apical enlargement for cleaning the apical third of curved canals. Int Endod J. 2010;43:988–94.

    Article  PubMed  Google Scholar 

  • Fuks AB. Pulp therapy for the primary and young permanent dentitions. Dent Clin N Am. 2000;44:571–96.

    PubMed  Google Scholar 

  • Goodacre CJ. Atlas of the human dentition. 2nd ed. Loma Linda: Loma Linda School of Dentistry; 2003.

    Google Scholar 

  • Hibbard ED, Ireland RL. Morphology of the root canals of the primary molar teeth. J Dent Child. 1957;24:250–7.

    Google Scholar 

  • Hülsmann M, Peters OA, Dummer PMH. Mechanical preparation of root canals: shaping goals, techniques and means. Endod Topics. 2005;10:30–76.

    Article  Google Scholar 

  • Johnston NJ, Franklin DL. Dental findings of a child with Wolf-Hirschhorn syndrome. Int J Paediatr Dent. 2006;16:139–42.

    Article  PubMed  Google Scholar 

  • Kavanagh C, O’Sullivan VR. A four-rooted primary upper second molar. Int J Paediatr Dent. 1998;8:279–82.

    Article  PubMed  Google Scholar 

  • Liu JF, Dai PW, Chen SY, et al. Prevalence of 3-rooted primary mandibular second molars among Chinese patients. Pediatr Dent. 2010;32:123–6.

    PubMed  Google Scholar 

  • Metzger Z, Teperovich E, Zary R, Cohen R, Hof R. The self-adjusting file (SAF). Part 1: respecting the root canal anatomy - a new concept of endodontic files and its implementation. J Endod. 2010;36:679–90.

    Article  PubMed  Google Scholar 

  • Peters OA, Laib A, Ruegsegger P, Barbakow F. Three-dimensional analysis of root canal geometry by high-resolution computed tomography. J Dent Res. 2000;79:1405–9.

    Article  PubMed  Google Scholar 

  • Poornima P. Subba Reddy VV. Comparison of digital radiography, decalcification, and histologic sectioning in the detection of accessory canals in furcation areas of human primary molars. J Indian Soc Pedod Prev Dent. 2008;26:49–52.

    Article  PubMed  Google Scholar 

  • Pratt WK. Digital image processing. 2nd ed. New York: Wiley; 1991.

    Google Scholar 

  • Ribeiro MVM, Silva-Sousa YT, Versiani MA, et al. Comparison of the cleaning efficacy of self-adjusting file and rotary systems in the apical third of oval-shaped canals. J Endod. 2013;39:398–410.

    Article  Google Scholar 

  • Ringelstein D, Seow WK. The prevalence of furcation foramina in primary molars. Pediatr Dent. 1989;11:198–202.

    PubMed  Google Scholar 

  • Salama FS, Anderson RW, McKnight-Hanes C, Barenie JT, Myers DR. Anatomy of primary incisor and molar root canals. Pediatr Dent. 1992;14:117–8.

    PubMed  Google Scholar 

  • Simpson WJ. An examination of root canal anatomy of primary teeth. J Can Dent Assoc. 1973;39:637–40.

    PubMed  Google Scholar 

  • Siqueira JF Jr, Alves FR, Almeida BM, de Oliveira JC, Roças IN. Ability of chemomechanical preparation with either rotary instruments or self-adjusting file to disinfect oval-shaped root canals. J Endod. 2010;36:1860–5.

    Article  PubMed  Google Scholar 

  • Song JS, Kim SO, Choi BJ, et al. Incidence and relationship of an additional root in the mandibular first permanent molar and primary molars. Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2009;107:e56–60.

    Article  PubMed  Google Scholar 

  • Versiani MA, Pécora JD, Sousa-Neto MD. Flat-oval root canal preparation with self-adjusting file instrument: a micro-computed tomography study. J Endod. 2011;37:1002–7.

    Article  PubMed  Google Scholar 

  • Versiani MA, Pécora JD, Sousa-Neto MD. Root and root canal morphology of four-rooted maxillary second molars: a micro-computed tomography study. J Endod. 2012;38:977–82.

    Article  PubMed  Google Scholar 

  • Versiani MA, Steier L, De-Deus G, et al. Micro-computed tomography study of oval-shaped canals prepared with the Self-adjusting File, Reciproc, WaveOne, and Protaper Universal systems. J Endod. 2013;39:1060–6.

    Article  PubMed  Google Scholar 

  • Winkler MP, Ahmad R. Multirooted anomalies in the primary dentition of Native Americans. J Am Dent Assoc. 1997;128:1009–11.

    Article  PubMed  Google Scholar 

  • Wrbas KT, Kielbassa AM, Hellwig E. Microscopic studies of accessory canals in primary molar furcations. ASDC J Dent Child. 1997;64:118–22.

    PubMed  Google Scholar 

  • Zoremchhingi, Joseph T, Varma B, Mungara J. A study of root canal morphology of human primary molars using computerized tomography: an in vitro study. J Indian Soc Pedod Prev Dent. 2005;23:7–12.

    Article  PubMed  Google Scholar 

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Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Pediatric Dentistry, Dental School of Ribeirão Preto, University of São Paulo, Av. do Café s/no, Bairro Monte Alegre, São Paulo, Ribeirão Preto, CEP 14049-904, Brazil

    A. C. Fumes, L. A. B. da Silva, R. A. B. da Silva & A. Consolaro

  2. Department of Restorative Dentistry, Dental School of Ribeirão Preto, University of São Paulo, Av. do Café s/no, Bairro Monte Alegre, São Paulo, Ribeirão Preto, CEP 14049-904, Brazil

    M. D. Sousa-Neto, G. B. Leoni & M. A. Versiani

  3. Rua Célia de Oliveira Meirelles 350, São Paulo, Ribeirão Preto, CEP 14024-070, Brazil

    M. D. Sousa-Neto

Authors
  1. A. C. Fumes
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  2. M. D. Sousa-Neto
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  3. G. B. Leoni
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  4. M. A. Versiani
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  5. L. A. B. da Silva
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  6. R. A. B. da Silva
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  7. A. Consolaro
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Correspondence to M. D. Sousa-Neto.

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Fumes, A.C., Sousa-Neto, M.D., Leoni, G.B. et al. Root canal morphology of primary molars: a micro-computed tomography study. Eur Arch Paediatr Dent 15, 317–326 (2014). https://doi.org/10.1007/s40368-014-0117-0

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  • DOI: https://doi.org/10.1007/s40368-014-0117-0

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