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Root Canal Morphology and Configuration of 118 Mandibular First Molars by Means of Micro–Computed Tomography: An Ex Vivo Study

Published:February 21, 2016DOI:https://doi.org/10.1016/j.joen.2016.01.004

      Highlights

      • Root canal configuration frequency in the mesial root: 2-2-2/2 (31.4%), 2-2-1/1 (15.3%), 2-2-2/3 (11.9%) of maxillary first molars.
      • Root canal configuration frequency in the distal root: 1-1-1/1 (58.5%) and 1-1-1/2 (10.2%) of maxillary first molars.
      • Connecting canals frequency between the mesiobuccal and mesiolingual root canals in the coronal (20.3%) and middle (14.4%) thirds.
      • Accessory apical foramina frequency in the mesiobuccal (1-4; 24.6%), mesiolingual (1-3; 28.0%), distolingual (1-4; 23.7%) and distobuccal (1; 3.4%) root canals.
      • The mesiobuccal, mesiolingual, and root canals showed accessory canals in the middle third in 18.6% and 33.9%, whereas the distobuccal and distolingual showed accessory canals in this third in only 4.2% and 4.2%.
      • The mesiobuccal root canal had 1–4 accessory apical foramina in 24.6%, and the mesiolingual had 1–3 accessory apical foramina in 28.0%. The distolingual root canal showed 1–4 accessory apical foramina in 23.7%, and in the distobuccal root canal only 1 foramen (3.4%) was observed.

      Abstract

      Introduction

      The aim of this study was to investigate the root canal system morphology of the mandibular first molar by means of micro–computed tomography.

      Methods

      The root canal configuration, foramina, and accessory canals frequency of 118 mandibular first molars were investigated by means of micro–computed tomography and 3-dimensional software imaging. A 4-digit system describes the root canal configuration from the coronal to apical thirds and the main foramina number.

      Results

      The most frequent root canal configurations in mesial root were 2-2-2/2 (31.4%), 2-2-1/1 (15.3%), and 2-2-2/3 (11.9%); another 24 different root canal configurations were observed in this root. A 1-1-1/1 (58.5%), 1-1-1/2 (10.2%), and 16 other root canal configurations were observed in the distal root. The mesiobuccal root canal showed 1–4 foramina in 24.6%, and the mesiolingual showed 1–3 foramina in 28.0%. One connecting canal between the mesial root canals was observed in 30.5% and 2 in 3.4%. The distolingual root canal showed 1–4 foramina in 23.7%, whereas a foramen in the distobuccal root canal was rarely detected (3.4%). The mesiobuccal, mesiolingual, and distolingual root canals showed at least 1 accessory canal (14.3, 10.2, and 4.2%, respectively), but the distobuccal had none.

      Conclusions

      The root canal configuration of mandibular first molars varies strongly. According to our expectations, both the mesial and distal roots showed a high number of morphologic diversifications. The root canal system of the mesial root showed more root canal configuration variations, connecting and accessory canals than the distal root.

      Key Words

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      References

        • Weine F.S.
        • Healey H.J.
        • Gerstein H.
        • Evanson L.
        Canal configuration in the mesiobuccal root of the maxillary first molar and its endodontic significance.
        Oral Surg Oral Med Oral Pathol. 1969; 28: 419-425
        • Vertucci F.J.
        Root canal anatomy of the human permanent teeth.
        Oral Surg Oral Med Oral Pathol. 1984; 58: 589-599
        • Schilder H.
        Filling root canals in three dimensions.
        Dent Clin North Am. 1967; 17: 723-744
        • Schilder H.
        Cleaning and shaping the root canal.
        Dent Clin North Am. 1974; 18: 269-296
        • Lee J.K.
        • Yoo Y.J.
        • Perinpanayagam H.
        • et al.
        Three-dimensional modelling and concurrent measurements of root anatomy in mandibular first molar mesial roots using micro-computed tomography.
        Int Endod J. 2015; 48: 380-389
        • Hull T.E.
        • Robertson P.B.
        • Steiner J.C.
        • del Aguila M.A.
        Patterns of endodontic care for a Washington state population.
        J Endod. 2003; 29: 553-556
        • Harris S.P.
        • Bowles W.R.
        • Fok A.
        • McClanahan S.B.
        An anatomic investigation of the mandibular first molar using micro-computed tomography.
        J Endod. 2013; 39: 1374-1378
        • de Pablo O.V.
        • Estevez R.
        • Péix Sánchez M.
        • et al.
        Root anatomy and canal configuration of the permanent mandibular first molar: a systematic review.
        J Endod. 2010; 36: 1919-1931
        • Rhodes J.S.
        • Ford T.R.
        • Lynch J.A.
        • et al.
        Micro-computed tomography: a new tool for experimental endodontology.
        Int Endod J. 1999; 32: 165-170
        • Plotino G.
        • Grande N.M.
        • Pecci R.
        • et al.
        Three-dimensional imaging using microcomputed tomography for studying tooth macromorphology.
        J Am Dent Assoc. 2006; 137: 1555-1561
        • Domark J.D.
        • Hatton J.F.
        • Benison R.P.
        • Hildebolt C.F.
        An ex vivo comparison of digital radiography and cone-beam and micro computed tomography in the detection of the number of canals in the mesiobuccal roots of maxillary molars.
        J Endod. 2013; 39: 901-905
        • Acar B.
        • Kamburoğlu K.
        • Tatar İ.
        • et al.
        Comparison of micro-computerized tomography and cone-beam computerized tomography in the detection of accessory canals in primary molars.
        Imaging Sci Dent. 2015; 45: 205-211
        • Briseño-Marroquín B.
        • Paqué F.
        • Willershausen B.
        • Wolf T.G.
        Root canal morphology and configuration of 179 maxillary first molars by means of micro-computed tomography: an ex vivo-study.
        J Endod. 2015; 41: 2008-2013
        • Marroquín B.B.
        • El-Sayed M.A.
        • Willershausen-Zönnchen B.
        Morphology of the physiological foramen: I—maxillary and mandibular molars.
        J Endod. 2004; 30: 321-328
        • Jordan R.E.
        • Abrams L.
        • Kraus B.S.
        Kraus' Dental Anatomy and Occlusion.
        Mosby Year Book, St Louis1992
        • Paqué F.
        • Ganahl D.
        • Peters O.A.
        Effects of root canal preparation on apical geometry assessed by micro-computed tomography.
        J Endod. 2009; 35: 1056-1059
        • Paqué F.
        • Peters O.A.
        Micro-computed tomography evaluation of the preparation of long oval root canals in mandibular molars with the self-adjusting file.
        J Endod. 2011; 37: 517-521
        • Paqué F.
        • Al-Jadaa A.
        • Kfir A.
        Hard-tissue debris accumulation created by conventional rotary versus self-adjusting file instrumentation in mesial root canal systems of mandibular molars.
        Int Endod J. 2012; 45: 413-418
        • Grande N.M.
        • Plotino G.
        • Gambarini G.
        • et al.
        Present and future in the use of micro-CT scanner 3D analysis for the study of dental and root canal morphology.
        Ann Ist Super Sanita. 2012; 48: 26-34
        • Calişkan M.K.
        • Pehlivan Y.
        • Sepetçioğlu F.
        • et al.
        Root canal morphology of human permanent teeth in a Turkish population.
        J Endod. 1995; 21: 200-204
        • Sert S.
        • Bayirli G.S.
        Evaluation of the root canal configurations of the mandibular and maxillary permanent teeth by gender in the Turkish population.
        J Endod. 2004; 30: 391-398
        • Pineda F.
        • Kuttler Y.
        Mesiodistal and buccolingual roentgenographic investigation of 7,275 root canals.
        Oral Surg Oral Med Oral Pathol. 1972; 33: 101-110
        • Gu Y.
        • Lu Q.
        • Wang H.
        • et al.
        Root canal morphology of permanent three-rooted mandibular first molars—part I: pulp floor and root canal system.
        J Endod. 2010; 36: 990-994
        • Filpo-Perez C.
        • Bramante C.M.
        • Villas-Boas M.H.
        • et al.
        Micro-computed tomographic analysis of the root canal morphology of the distal root of mandibular first molar.
        J Endod. 2015; 41: 231-236
        • Villas-Boas M.H.
        • Bernardineli N.
        • Cavenago B.C.
        • et al.
        Micro-computed tomography study of the internal anatomy of mesial root canals of mandibular molars.
        J Endod. 2011; 37: 1682-1686