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Root Canal Anatomy: Implications in Biofilm Disinfection

  • Marco A. VersianiEmail author
  • Ronald Ordinola-Zapata
Chapter
Part of the Springer Series on Biofilms book series (BIOFILMS, volume 9)

Abstract

The primary goals of endodontic treatment are to disinfect and to seal the root canal system as effectively as possible, aiming to establish or maintain healthy periapical tissues. Treating complex and anomalous anatomy requires knowledge of the internal anatomy of all types of the teeth before undertaking endodontic therapy. Recently, three-dimensional imaging using micro-computed tomography has been used to reveal the internal anatomy of the teeth to the clinician, bringing new perspectives on the overall quality of the endodontic treatment and confirming the inability of shaping tools in acting within the anatomical complexity of the root canal. Furthermore, the disinfecting effects of instruments and irrigants may be additionally hampered in the presence of accessory canals, ramifications, intercanal connections, fins, isthmuses, and apical deltas, which can be ideal sites for microbial biofilm formation and cannot be properly assessed by conventional techniques. Apart from biofilms, these hard-to-reach areas may also be packed with dentin debris generated and pushed therein by endodontic instruments, interfering with disinfection by both preventing the irrigant flow into them and by neutralizing its efficacy. This chapter provides an overview of recent information on the complexity of root canal anatomy and discusses its relationship to the understanding of the principles and problems of microbial biofilm elimination.

Keywords

Root Canal Dentinal Tubule Pulp Chamber Root Canal System Maxillary Molar 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. AAE (2012) Glossary of endodontics terms, 8th edn. American Association of Endodontists, ChicagoGoogle Scholar
  2. Adcock JM, Sidow SJ, Looney SW et al (2011) Histologic evaluation of canal and isthmus debridement efficacies of two different irrigant delivery techniques in a closed system. J Endod 37:544–548PubMedCrossRefGoogle Scholar
  3. Adloff P (1913) Das Durchsichtigmachen von Zähnen und unsere Wurzelfüllungsmethoden. Dtsch Monatsschr Zahnheifkd 31:445Google Scholar
  4. Al-Fouzan KS (2002) C-shaped root canals in mandibular second molars in a Saudi Arabian population. Int Endod J 35:499–504PubMedCrossRefGoogle Scholar
  5. Al-Qudah AA, Awawdeh LA (2006) Root canal morphology of mandibular incisors in a Jordanian population. Int Endod J 39:873–877PubMedCrossRefGoogle Scholar
  6. Appel TR, Baumann MA (2002) Solid-state nuclear magnetic resonance microscopy demonstrating human dental anatomy. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 94:256–261PubMedCrossRefGoogle Scholar
  7. Backman CA, Oswald RJ, Pitts DL (1992) A radiographic comparison of two root canal instrumentation techniques. J Endod 18:19–24PubMedCrossRefGoogle Scholar
  8. Baratto-Filho F, Fariniuk LF, Ferreira EL, Pécora JD, Cruz-Filho AM, Sousa-Neto MD (2002) Clinical and macroscopic study of maxillary molars with two palatal roots. Int Endod J 35:796–801PubMedCrossRefGoogle Scholar
  9. Barker BC, Lockett BC, Parsons KC (1969) The demonstration of root canal anatomy. Aust Dent J 14:37–41PubMedCrossRefGoogle Scholar
  10. Barker BC, Parsons KC, Mills PR, Williams GL (1973) Anatomy of root canals. I. Permanent incisors, canines and premolars. Aust Dent J 18:320–327PubMedCrossRefGoogle Scholar
  11. Barker BC, Parsons KC, Mills PR, Williams GL (1974a) Anatomy of root canals. III. Permanent mandibular molars. Aust Dent J 19:408–413PubMedCrossRefGoogle Scholar
  12. Barker BC, Parsons KC, Mills PR, Williams GL (1974b) Anatomy of root canals. II. Permanent maxillary molars. Aust Dent J 19:46–50PubMedCrossRefGoogle Scholar
  13. Barton DJ, Clark SJ, Eleazer PD, Scheetz JP, Farman AG (2003) Tuned-aperture computed tomography versus parallax analog and digital radiographic images in detecting second mesiobuccal canals in maxillary first molars. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 96:223–228PubMedCrossRefGoogle Scholar
  14. Bauman R, Scarfe W, Clark S, Morelli J, Scheetz J, Farman A (2011) Ex vivo detection of mesiobuccal canals in maxillary molars using CBCT at four different isotropic voxel dimensions. Int Endod J 44:752–758PubMedCrossRefGoogle Scholar
  15. Baumann MA (1994) A new approach to demonstration of root canal anatomy. J Dent Educ 58:704–708PubMedGoogle Scholar
  16. Baumann MA, Doll GM (1997) Spatial reproduction of the root canal system by magnetic resonance microscopy. J Endod 23:49–51PubMedCrossRefGoogle Scholar
  17. Baumann MA, Schwebel T, Kriete A (1993) Dental anatomy portrayed with microscopic volume investigations. Comput Med Imaging Graph 17:221–228PubMedCrossRefGoogle Scholar
  18. Bergenholtz G, Spångberg LS (2004) Controversies in endodontics. Crit Rev Oral Biol Med 15:99–114PubMedCrossRefGoogle Scholar
  19. Bergmans L, Van Cleynenbreugel J, Wevers M, Lambrechts P (2001) A methodology for quantitative evaluation of root canal instrumentation using microcomputed tomography. Int Endod J 34:390–398PubMedCrossRefGoogle Scholar
  20. Berutti E (1993) Computerized analysis of the instrumentation of the root canal system. J Endod 19:236–238PubMedCrossRefGoogle Scholar
  21. Bjørndal L, Carlsen O, Thuesen G, Darvann T, Kreiborg S (1999) External and internal macromorphology in 3D-reconstructed maxillary molars using computerized X-ray microtomography. Int Endod J 32:3–9PubMedCrossRefGoogle Scholar
  22. Black GV (1890) Descriptive anatomy of the human teeth. The Wilmington Dental Manufacturing Co, PhiladelphiaGoogle Scholar
  23. Blašković-Šubat V, Marićić B, Sutalo J (1992) Asymmetry of the root canal foramen. Int Endod J 25:158–164PubMedCrossRefGoogle Scholar
  24. Blašković-Šubat V, Smojver B, Marićić B, Sutalo J (1995) A computerized method for the evaluation of root canal morphology. Int Endod J 28:290–296PubMedCrossRefGoogle Scholar
  25. Boveda C, Fajardo M, Millan B (1999) Root canal treatment of an invaginated maxillary lateral incisor with a C-shaped canal. Quintessence Int 30:707–711PubMedGoogle Scholar
  26. Burch JG, Hulen S (1972) The relationship of the apical foramen to the anatomic apex of the tooth root. Oral Surg Oral Med Oral Pathol 34:262–268PubMedCrossRefGoogle Scholar
  27. Burger CL, Mork TO, Hutter JW, Nicoll B (1999) Direct digital radiography versus conventional radiography for estimation of canal length in curved canals. J Endod 25:260–263PubMedCrossRefGoogle Scholar
  28. Calberson FL, De Moor RJ, Deroose CA (2007) The radix entomolaris and paramolaris: clinical approach in endodontics. J Endod 33:58–63PubMedCrossRefGoogle Scholar
  29. Carabelli G (1842) Systematisches Handbuch der Zahnheilkunde II Anatomic des Mundes. Braumuller and Siedel, ViennaGoogle Scholar
  30. Carlsen O, Alexandersen V (1991) Radix paramolaris in permanent mandibular molars: identification and morphology. Scan J Dent Res 99:189–195Google Scholar
  31. Cheung LH, Cheung GS (2008) Evaluation of a rotary instrumentation method for C-shaped canals with micro-computed tomography. J Endod 34:1233–1238PubMedCrossRefGoogle Scholar
  32. Cimilli H, Cimilli T, Mumcu G, Kartal N, Wesselink P (2005) Spiral computed tomographic demonstration of C-shaped canals in mandibular second molars. Dentomaxillofac Radiol 34:164–167PubMedCrossRefGoogle Scholar
  33. Cleghorn BM, Christie WH, Dong CC (2006) Root and root canal morphology of the human permanent maxillary first molar: a literature review. J Endod 32:813–821PubMedCrossRefGoogle Scholar
  34. Cleghorn BM, Christie WH, Dong CC (2008) Anomalous mandibular premolars: a mandibular first premolar with three roots and a mandibular second premolar with a C-shaped canal system. Int Endod J 41:1005–1014PubMedCrossRefGoogle Scholar
  35. Cooke HG 3rd, Cox FL (1979) C-shaped canal configurations in mandibular molars. J Am Dent Assoc 99:836–839PubMedCrossRefGoogle Scholar
  36. Cunningham CJ, Senia ES (1992) A three-dimensional study of canal curvatures in the mesial roots of mandibular molars. J Endod 18:294–300PubMedCrossRefGoogle Scholar
  37. Cutright DE, Bhaskar SN (1969) Pulpal vasculature as demonstrated by a new method. Oral Surg Oral Med Oral Pathol 27:678–683PubMedCrossRefGoogle Scholar
  38. Dammaschke T, Witt M, Ott K, Schafer E (2004) Scanning electron microscopic investigation of incidence, location, and size of accessory foramina in primary and permanent molars. Quintessence Int 35:699–705PubMedGoogle Scholar
  39. De Deus QD (1975) Frequency, location, and direction of the lateral, secondary, and accessory canals. J Endod 1:361–366PubMedCrossRefGoogle Scholar
  40. De Moor RJ (2002) C-shaped root canal configuration in maxillary first molars. Int Endod J 35:200–208PubMedCrossRefGoogle Scholar
  41. De Moor RJ, Deroose CA, Calberson FL (2004) The radix entomolaris in mandibular first molars: an endodontic challenge. Int Endod J 37:789–799PubMedCrossRefGoogle Scholar
  42. Degerness R, Bowles W (2008) Anatomic determination of the mesiobuccal root resection level in maxillary molars. J Endod 34:1182–1186PubMedCrossRefGoogle Scholar
  43. Dewey M (1916) Dental anatomy. C.V. Mosby Company, St. LouisGoogle Scholar
  44. Dobó-Nagy C, Keszthelyi G, Szabó J, Sulyok P, Ledeczky G, Szabó J (2000) A computerized method for mathematical description of three-dimensional root canal axis. J Endod 26:639–643PubMedCrossRefGoogle Scholar
  45. Dowker SE, Davis GR, Elliott JC (1997) X-ray microtomography: nondestructive three-dimensional imaging for in vitro endodontic studies. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 83:510–516PubMedCrossRefGoogle Scholar
  46. Dummer PM, McGinn JH, Rees DG (1984) The position and topography of the apical canal constriction and apical foramen. Int Endod J 17:192–198PubMedCrossRefGoogle Scholar
  47. Endal U, Shen Y, Knut A, Gao Y, Haapasalo M (2011) A high-resolution computed tomographic study of changes in root canal isthmus area by instrumentation and root filling. J Endod 37:223–227PubMedCrossRefGoogle Scholar
  48. Estrela C, Pereira HL, Pécora JD (1995) Radicular grooves in maxillary lateral incisor: case report. Braz Dent J 6:143–146PubMedGoogle Scholar
  49. Fabra-Campos H (1989) Three canals in the mesial root of mandibular first permanent molars: a clinical study. Int Endod J 22:39–43PubMedCrossRefGoogle Scholar
  50. Fan B, Cheung GS, Fan M, Gutmann JL, Bian Z (2004) C-shaped canal system in mandibular second molars: part I–Anatomical features. J Endod 30:899–903PubMedCrossRefGoogle Scholar
  51. Fan B, Yang J, Gutmann JL, Fan M (2008) Root canal systems in mandibular first premolars with C-shaped root configurations. Part I: Microcomputed tomography mapping of the radicular groove and associated root canal cross-sections. J Endod 34:1337–1341PubMedCrossRefGoogle Scholar
  52. Fan B, Min Y, Lu G, Yang J, Cheung GS, Gutmann JL (2009) Negotiation of C-shaped canal systems in mandibular second molars. J Endod 35:1003–1008PubMedCrossRefGoogle Scholar
  53. Fan B, Pan Y, Gao Y, Fang F, Wu Q, Gutmann JL (2010) Three-dimensional morphologic analysis of isthmuses in the mesial roots of mandibular molars. J Endod 36:1866–1869PubMedCrossRefGoogle Scholar
  54. Fan B, Ye W, Xie E, Wu H, Gutmann JL (2012) Three-dimensional morphological analysis of C-shaped canals in mandibular first premolars in a Chinese population. Int Endod J 45:1035–1041PubMedCrossRefGoogle Scholar
  55. Fasoli G (1913) Sull’anatomia dei canali radicolari dei denti umani. Stomatologia 11:409–415Google Scholar
  56. Ferraz JA, de Carvalho Junior JR, Saquy PC, Pécora JD, Sousa-Neto MD (2001) Dental anomaly: dens evaginatus (talon cusp). Braz Dent J 12:132–134PubMedGoogle Scholar
  57. Fisher G (1908) Beitrage zur behandlung enkrankter zahne mit besonderer beucksichtigung der anatomie und pathologie der wurzelkanale. Georg Thiéme, LeipzigGoogle Scholar
  58. Gambill JM, Alder M, del Rio CE (1996) Comparison of nickel-titanium and stainless steel hand-file instrumentation using computed tomography. J Endod 22:369–375PubMedCrossRefGoogle Scholar
  59. Gao Y, Fan B, Cheung GS, Gutmann JL, Fan M (2006) C-shaped canal system in mandibular second molars part IV: 3-D morphological analysis and transverse measurement. J Endod 32:1062–1065PubMedCrossRefGoogle Scholar
  60. Garg AK, Tewari RK, Agrawal N (2013) Prevalence of three-rooted mandibular first molars among Indians using SCT. Int J Dent 2013:183869PubMedCentralPubMedCrossRefGoogle Scholar
  61. Gilles J, Reader A (1990) An SEM investigation of the mesiolingual canal in human maxillary first and second molars. Oral Surg Oral Med Oral Pathol 70:638–643PubMedCrossRefGoogle Scholar
  62. Grande NM, Plotino G, Gambarini G et al (2012) 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 48:26–34PubMedGoogle Scholar
  63. Green D (1955) Morphology of pulp cavity of the permanent teeth. Oral Surg Oral Med Oral Pathol 8:743–759PubMedCrossRefGoogle Scholar
  64. Green D (1956) A stereomicroscopic study of the root apices of 400 maxillary and mandibular anterior teeth. Oral Surg Oral Med Oral Pathol 9:1224–1232PubMedCrossRefGoogle Scholar
  65. Green EN (1958) Microscopic investigation of root canal diameters. J Am Dent Assoc 57:636–644PubMedCrossRefGoogle Scholar
  66. Green D (1973) Double canals in single roots. Oral Surg Oral Med Oral Pathol 35:689–696PubMedCrossRefGoogle Scholar
  67. Grover C, Shetty N (2012) Methods to study root canal morphology: a review. Quintessence Int 6:171–182Google Scholar
  68. Gu YC (2011) A micro-computed tomographic analysis of maxillary lateral incisors with radicular grooves. J Endod 37:789–792PubMedCrossRefGoogle Scholar
  69. Gu Y, Lee JK, Spangberg LS et al (2011) Minimum-intensity projection for in-depth morphology study of mesiobuccal root. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 112:671–677PubMedCrossRefGoogle Scholar
  70. Gu YC, Zhang YP, Liao ZG, Fei XD (2013a) A micro-computed tomographic analysis of wall thickness of C-shaped canals in mandibular first premolars. J Endod 39:973–976PubMedCrossRefGoogle Scholar
  71. Gu Y, Zhang Y, Liao Z (2013b) Root and canal morphology of mandibular first premolars with radicular grooves. Arch Oral Biol 58:1609–1617PubMedCrossRefGoogle Scholar
  72. Guerisoli DM, de Souza RA, de Sousa Neto MD, Silva RG, Pécora JD (1998) External and internal anatomy of third molars. Braz Dent J 9:91–94PubMedGoogle Scholar
  73. Gulabivala K, Aung TH, Alavi A, Ng YL (2001) Root and canal morphology of Burmese mandibular molars. Int Endod J 34:359–370PubMedCrossRefGoogle Scholar
  74. Gulabivala K, Opasanon A, Ng YL, Alavi A (2002) Root and canal morphology of Thai mandibular molars. Int Endod J 35:56–62PubMedCrossRefGoogle Scholar
  75. Gullickson DC, Montgomery S (1987) The study of root canal morphology using a digital image processing technique. J Endod 13:158–163PubMedCrossRefGoogle Scholar
  76. Gutierrez JH, Aguayo P (1995) Apical foraminal openings in human teeth. Number and location. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 79:769–777PubMedCrossRefGoogle Scholar
  77. Gysi A, Röse C (1894) Sammlung von Mikrophotographien zur Veranschaulichung der mikroscopischen Struktur der Zähne des Menschen. Mikrophotographien der Zahnhistologie. Schweiz, ZürichGoogle Scholar
  78. Haddad GY, Nehme WB, Ounsi HF (1999) Diagnosis, classification, and frequency of C-shaped canals in mandibular second molars in the Lebanese population. J Endod 25:268–271PubMedCrossRefGoogle Scholar
  79. Han X, Yang H, Li G, Yang L, Tian C, Wang Y (2012) A study of the distobuccal root canal orifice of the maxillary second molars in Chinese individuals evaluated by cone-beam computed tomography. J Appl Oral Sci 20:563–567PubMedCentralPubMedCrossRefGoogle Scholar
  80. Hargreaves KM, Cohen S (2011) Cohen’s pathways of the pulp, 10th edn. Mosby, St. LouisGoogle Scholar
  81. Harris SP, Bowles WR, Fok A, McClanahan SB (2013) An anatomic investigation of the mandibular first molar using micro-computed tomography. J Endod 39:1374–1378PubMedCrossRefGoogle Scholar
  82. Hassan BA, Payam J, Juyanda B, van der Stelt P, Wesselink PR (2012) Influence of scan setting selections on root canal visibility with cone beam CT. Dentomaxillofac Radiol 41:645–648PubMedCentralPubMedCrossRefGoogle Scholar
  83. Hegedus C, Flora-Nagy E, Martos R et al (2000) 3D reconstruction based on hard tissue microtome cross-section pictures in dentistry. Comput Methods Programs Biomed 63:77–84PubMedCrossRefGoogle Scholar
  84. Hess W (1917) Die pulpaamputation als selbstandige wurzelbehandlungs method. Georg Thiéme, LeipzigGoogle Scholar
  85. Hess W, Zurcher E (1925) The anatomy of the root canals of the teeth of the permanent and deciduous dentitions. John Bale, Sons & Danielsson, Ltd., LondonGoogle Scholar
  86. Hsu YY, Kim S (1997) The resected root surface. The issue of canal isthmuses. Dent Clin North Am 41:529–540PubMedGoogle Scholar
  87. Huang CC, Chang YC, Chuang MC et al (2010) Evaluation of root and canal systems of mandibular first molars in Taiwanese individuals using cone-beam computed tomography. J Formos Med Assoc 109:303–308PubMedCrossRefGoogle Scholar
  88. Hülsmann M (1997) Dens invaginatus: aetiology, classification, prevalence, diagnosis, and treatment considerations. Int Endod J 30:79–90PubMedCrossRefGoogle Scholar
  89. Idiyatullin D, Corum C, Moeller S, Prasad HS, Garwood M, Nixdorf DR (2011) Dental magnetic resonance imaging: making the invisible visible. J Endod 37:745–752PubMedCentralPubMedCrossRefGoogle Scholar
  90. Jafarzadeh H, Wu YN (2007) The C-shaped root canal configuration: a review. J Endod 33:517–523PubMedCrossRefGoogle Scholar
  91. Jin GC, Lee SJ, Roh BD (2006) Anatomical study of C-shaped canals in mandibular second molars by analysis of computed tomography. J Endod 32:10–13PubMedCrossRefGoogle Scholar
  92. Jung IY, Seo MA, Fouad AF et al (2005) Apical anatomy in mesial and mesiobuccal roots of permanent first molars. J Endod 31:364–368PubMedCrossRefGoogle Scholar
  93. Kaffe I, Kaufman A, Littner MM, Lazarson A (1985) Radiographic study of the root canal system of mandibular anterior teeth. Int Endod J 18:253–259PubMedCrossRefGoogle Scholar
  94. Keith A, Knowles FHS (1911) The description of teeth of palaeolithic man from Jersey. J Anat Physiol 46:12–27PubMedCentralPubMedGoogle Scholar
  95. Keleş A, Alcin H, Kamalak A, Versiani MA (2014) Micro-CT evaluation of root filling quality in ovalshaped canals. Int Endod J 47(12):1177–1184PubMedCrossRefGoogle Scholar
  96. Kerekes K, Tronstad L (1977a) Morphometric observations on the root canals of human molars. J Endod 3:114–118PubMedCrossRefGoogle Scholar
  97. Kerekes K, Tronstad L (1977b) Morphometric observations on root canals of human anterior teeth. J Endod 3:24–29PubMedCrossRefGoogle Scholar
  98. Kerekes K, Tronstad L (1977c) Morphometric observations on root canals of human premolars. J Endod 3:74–79PubMedCrossRefGoogle Scholar
  99. Kim Y, Lee SJ, Woo J (2012) Morphology of maxillary first and second molars analyzed by cone-beam computed tomography in a korean population: variations in the number of roots and canals and the incidence of fusion. J Endod 38:1063–1068PubMedCrossRefGoogle Scholar
  100. Kim Y, Chang SW, Lee JK et al (2013) A micro-computed tomography study of canal configuration of multiple-canalled mesiobuccal root of maxillary first molar. Clin Oral Investig 17:1541–1546PubMedCrossRefGoogle Scholar
  101. Kocsis G, Marcsik A, Kokai E, Kocsis K (2002) Supernumerary occlusal cusps on permanent human teeth. Acta Biol Szeged 46:71–82Google Scholar
  102. Krasner P, Rankow HJ (2004) Anatomy of the pulp-chamber floor. J Endod 30:5–16PubMedCrossRefGoogle Scholar
  103. Lee JH, Kim KD, Lee JK et al (2011) Mesiobuccal root canal anatomy of Korean maxillary first and second molars by cone-beam computed tomography. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 111:785–791PubMedCrossRefGoogle Scholar
  104. Leoni GB, Versiani MA, Pécora JD, Sousa-Neto MD (2014) Micro–computed tomographic analysis of the root canal morphology of mandibular incisors. J Endod 40(5):710–716PubMedCrossRefGoogle Scholar
  105. Levitan ME, Himel VT (2006) Dens evaginatus: literature review, pathophysiology, and comprehensive treatment regimen. J Endod 32:1–9PubMedCrossRefGoogle Scholar
  106. Love RM, Jenkinson HF (2002) Invasion of dentinal tubules by oral bacteria. Crit Rev Oral Biol Med 13:171–183PubMedCrossRefGoogle Scholar
  107. Lu TY, Yang SF, Pai SF (2006) Complicated root canal morphology of mandibular first premolar in a Chinese population using the cross section method. J Endod 32:932–936PubMedCrossRefGoogle Scholar
  108. Luiten DJ, Morgan LA, Baugartner JC, Marshall JG (1995) A comparison of four instrumentation techniques on apical canal transportation. J Endod 21:26–32PubMedCrossRefGoogle Scholar
  109. Lyroudia K, Mikrogeorgis G, Nikopoulos N, Samakovitis G, Molyvdas I, Pitas I (1997a) Computerized 3-D reconstruction of two “double teeth”. Endod Dent Traumatol 13:218–222PubMedCrossRefGoogle Scholar
  110. Lyroudia K, Samakovitis G, Pitas I, Lambrianidis T, Molyvdas I, Mikrogeorgis G (1997b) 3D reconstruction of two C-shape mandibular molars. J Endod 23:101–104PubMedCrossRefGoogle Scholar
  111. Lyroudia K, Mikrogeorgis G, Bakaloudi P, Kechagias E, Nikolaidis N, Pitas I (2002) Virtual endodontics: three-dimensional tooth volume representations and their pulp cavity access. J Endod 28:599–602PubMedCrossRefGoogle Scholar
  112. Manning SA (1990) Root canal anatomy of mandibular second molars. Part II. C-shaped canals. Int Endod J 23:40–45PubMedCrossRefGoogle Scholar
  113. Mannocci F, Peru M, Sherriff M, Cook R, Pitt Ford TR (2005) The isthmuses of the mesial root of mandibular molars: a micro-computed tomographic study. Int Endod J 38:558–563PubMedCrossRefGoogle Scholar
  114. Marceliano-Alves MF, Sousa-Neto MD, Fidel SR, Steier L, Robinson JP, Pécora JD, Versiani MA (2014) Shaping ability of single-file reciprocating and heat-treated multifile rotary systems: a micro-CT study. Int Endod J. doi: 10.1111/iej.12412 [Epub ahead of print]
  115. Martins JN, Quaresma S, Quaresma MC, Frisbie-Teel J (2013) C-shaped maxillary permanent first molar: a case report and literature review. J Endod 39:1649–1653PubMedCrossRefGoogle Scholar
  116. Matherne RP, Angelopoulos C, Kulild JC, Tira D (2008) Use of cone-beam computed tomography to identify root canal systems in vitro. J Endod 34:87–89PubMedCrossRefGoogle Scholar
  117. Mauger MJ, Schindler WG, Walker WA 3rd (1998) An evaluation of canal morphology at different levels of root resection in mandibular incisors. J Endod 24:607–609PubMedCrossRefGoogle Scholar
  118. Mayo CV, Montgomery S, de Rio C (1986) A computerized method for evaluating root canal morphology. J Endod 12:2–7PubMedCrossRefGoogle Scholar
  119. Melton DC, Krell KV, Fuller MW (1991) Anatomical and histological features of C-shaped canals in mandibular second molars. J Endod 17:384–388PubMedCrossRefGoogle Scholar
  120. Merrill RG (1964) Occlusal anomalous tubercles on premolars of alaskan Eskimos and Indians. Oral Surg Oral Med Oral Pathol 17:484–496PubMedCrossRefGoogle Scholar
  121. Metgud S, Metgud R, Rani K (2009) Management of a patient with a taurodont, single-rooted molars associated with multiple dental anomalies: a spiral computerized tomography evaluation. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 108:e81–e86PubMedCrossRefGoogle Scholar
  122. Meyer W, Scheele E (1955) Die Anatomie der Wurzelkanäle der oberen Frontzähne. Deutsch Zahnärztl 10:1041–1045Google Scholar
  123. Michetti J, Maret D, Mallet JP, Diemer F (2010) Validation of cone beam computed tomography as a tool to explore root canal anatomy. J Endod 36:1187–1190PubMedCrossRefGoogle Scholar
  124. Min Y, Fan B, Cheung GS, Gutmann JL, Fan M (2006) C-shaped canal system in mandibular second molars Part III: the morphology of the pulp chamber floor. J Endod 32:1155–1159PubMedCrossRefGoogle Scholar
  125. Mizutani T, Ohno N, Nakamura H (1992) Anatomical study of the root apex in the maxillary anterior teeth. J Endod 18:344–347PubMedCrossRefGoogle Scholar
  126. Mjör IA (2009) Dentin permeability: the basis for understanding pulp reactions and adhesive technology. Braz Dent J 20:3–16PubMedCrossRefGoogle Scholar
  127. Moral H (1915) Uber das vorkommen eines vierten kanals in oberen molaren. Österr-Ungar Vjschr Zahnheilk 31:313–325Google Scholar
  128. Morfis A, Sylaras SN, Georgopoulou M, Kernani M, Prountzos F (1994) Study of the apices of human permanent teeth with the use of a scanning electron microscope. Oral Surg Oral Med Oral Pathol 77:172–176PubMedCrossRefGoogle Scholar
  129. Mueller AH (1933) Anatomy of the root canals of the incisors, cuspids and bicuspids of the permanent teeth. J Am Dent Assoc 20:1361–1386Google Scholar
  130. Mühlreiter E (1870) Anatomie des menschlichen Gebisses von med. Th. E. de Jonge Cohen. Arthur Felix, LeipzigGoogle Scholar
  131. Nagy CD, Szabo J, Szabo J (1995) A mathematically based classification of root canal curvatures on natural human teeth. J Endod 21:557–560PubMedCrossRefGoogle Scholar
  132. Nance R, Tyndall D, Levin LG, Trope M (2000) Identification of root canals in molars by tuned-aperture computed tomography. Int Endod J 33:392–396PubMedCrossRefGoogle Scholar
  133. Nanci A, Ten Cate AR (2013) Ten Cate’s oral histology: development, structure, and function, 8th edn. Elsevier, St. LouisGoogle Scholar
  134. Naoum HJ, Love RM, Chandler NP, Herbison P (2003) Effect of X-ray beam angulation and intraradicular contrast medium on radiographic interpretation of lower first molar root canal anatomy. Int Endod J 36:12–19PubMedCrossRefGoogle Scholar
  135. Nattress BR, Martin DM (1991) Predictability of radiographic diagnosis of variations in root canal anatomy in mandibular incisor and premolar teeth. Int Endod J 24:58–62PubMedCrossRefGoogle Scholar
  136. Nayak BG, Singh I (2013) Using spiral computed tomography for endodontic management of a mandibular first molar with a middle mesial canal: a case report. Gen Dent 61:43–46PubMedGoogle Scholar
  137. Neelakantan P, Subbarao C, Ahuja R, Subbarao CV, Gutmann JL (2011) Cone-beam computed tomography study of root and canal morphology of maxillary first and second molars in an Indian population. J Endod 36:1622–1627CrossRefGoogle Scholar
  138. Newton CW, McDonald S (1984) A C-shaped canal configuration in a maxillary first molar. J Endod 10:397–399PubMedCrossRefGoogle Scholar
  139. Ng YL, Aung TH, Alavi A, Gulabivala K (2001) Root and canal morphology of Burmese maxillary molars. Int Endod J 34:620–630PubMedCrossRefGoogle Scholar
  140. Nielsen RB, Alyassin AM, Peters DD, Carnes DL, Lancaster J (1995) Microcomputed tomography: an advanced system for detailed endodontic research. J Endod 21:561–568PubMedCrossRefGoogle Scholar
  141. Oehlers FA (1957a) Dens invaginatus (dilated composite odontome). I. Variations of the invagination process and associated anterior crown forms. Oral Surg Oral Med Oral Pathol 10:1204–1218, contdPubMedCrossRefGoogle Scholar
  142. Oehlers FA (1957b) Dens invaginatus (dilated composite odontome). II. Associated posterior crown forms and pathogenesis. Oral Surg Oral Med Oral Pathol 10:1302–1316PubMedCrossRefGoogle Scholar
  143. Oehlers FA, Lee KW, Lee EC (1967) Dens evaginatus (evaginated odontome). Its structure and responses to external stimuli. Dent Pract Dent Rec 17:239–244PubMedGoogle Scholar
  144. Okumura T (1927) Anatomy of the root canals. J Am Dent Assoc 14:632–636Google Scholar
  145. Ordinola-Zapata R, Bramante CM, Villas-Boas MH, Cavenago BC, Duarte MH, Versiani MA (2013) Morphologic micro–computed tomography analysis of mandibular premolars with three root canals. J Endod 39:1130–1135PubMedCrossRefGoogle Scholar
  146. Ordinola-Zapata R, Monteiro Bramante C, Gagliardi Minotti P, Cavalini Cavenago B, Gutmann JL, Moldauer BI, Versiani MA, Hungaro Duarte MA (2014) Micro-CT evaluation of C-shaped mandibular first premolars in a Brazilian subpopulation. Int Endod J. doi: 10.1111/iej.12380. [Epub ahead of print]
  147. Pao YC, Reinhardt RA, Krejci RF, Taylor DT (1984) Computer-graphics aided instruction of three-dimensional dental anatomy. J Dent Educ 48:315–317PubMedGoogle Scholar
  148. Pécora JD, Saquy PC, de Souza JE, Sousa-Neto MD (1991) Endodontic treatment of a maxillary lateral incisor presenting dens invaginatus and transposition to the region of the canine–case report. Braz Dent J 2:5–8PubMedGoogle Scholar
  149. Pécora JD, Saquy PC, Sousa-Neto MD, Woelfel JB (1992a) Root form and canal anatomy of maxillary first premolars. Braz Dent J 2:87–94PubMedGoogle Scholar
  150. Pécora JD, Woelfel JB, Sousa Neto MD, Issa EP (1992b) Morphologic study of the maxillary molars. Part II: Internal anatomy. Braz Dent J 3:53–57PubMedGoogle Scholar
  151. Pécora JD, Conrado CA, Zuccolotto WG, Sousa-Neto MD, Saquy PC (1993a) Root canal therapy of an anomalous maxillary central incisor: a case report. Endod Dent Traumatol 9:260–262PubMedCrossRefGoogle Scholar
  152. Pécora JD, Sousa Neto MD, Saquy PC (1993b) Internal anatomy, direction and number of roots and size of human mandibular canines. Braz Dent J 4:53–57PubMedGoogle Scholar
  153. Pécora JD, Sousa-Neto MD, Saquy PC, Woelfel JB (1993c) In vitro study of root canal anatomy of maxillary second premolars. Braz Dent J 3:81–85PubMedGoogle Scholar
  154. Peiris HR, Pitakotuwage TN, Takahashi M, Sasaki K, Kanazawa E (2008) Root canal morphology of mandibular permanent molars at different ages. Int Endod J 41:828–835PubMedCrossRefGoogle Scholar
  155. Perrini N, Castagnola L, Hess W, Keller’s O (1998) Anatomical plates: studies on the anatomical structure of root canals in human dentition by a method of making the tooth substance transparent (1928). Altini Communicazioni Grafiche, MilanGoogle Scholar
  156. Peters OA, Laib A, Ruegsegger P, Barbakow F (2000) Three-dimensional analysis of root canal geometry by high-resolution computed tomography. J Dent Res 79:1405–1409PubMedCrossRefGoogle Scholar
  157. Peters OA, Laib A, Gohring TN, Barbakow F (2001) Changes in root canal geometry after preparation assessed by high-resolution computed tomography. J Endod 27:1–6PubMedCrossRefGoogle Scholar
  158. Pineda F, Kuttler Y (1972) Mesiodistal and buccolingual roentgenographic investigation of 7275 root canals. Oral Surg Oral Med Oral Pathol 33:101–110PubMedCrossRefGoogle Scholar
  159. Ponce EH, Vilar Fernandez JA (2003) The cemento-dentino-canal junction, the apical foramen, and the apical constriction: evaluation by optical microscopy. J Endod 29:214–219PubMedCrossRefGoogle Scholar
  160. Poyton HG, Morgan GA (1966) Dens in dente. Dent Radiogr Photogr 39:27–33, passimPubMedGoogle Scholar
  161. Preiswerk G (1903) Leherbuch und Atlas der Zahnheilkunde mit Einschluβ der Mund-Krankheiten. J. F. Lehmann, MunichGoogle Scholar
  162. Pruett JP, Clement DJ, Carnes DL Jr (1997) Cyclic fatigue testing of nickel-titanium endodontic instruments. J Endod 23:77–85PubMedCrossRefGoogle Scholar
  163. Rahimi S, Shahi S, Lotfi M, Zand V, Abdolrahimi M, Es'haghi R (2008) Root canal configuration and the prevalence of C-shaped canals in mandibular second molars in an Iranian population. J Oral Sci 50:9–13PubMedCrossRefGoogle Scholar
  164. Regezi JA, Sciubba JJ, Jordan RCK (2008) Oral pathology: clinical pathologic correlations, 5th edn. Saunders/Elsevier, St. LouisGoogle Scholar
  165. Reuben J, Velmurugan N, Kandaswamy D (2008) The evaluation of root canal morphology of the mandibular first molar in an Indian population using spiral computed tomography scan: an in vitro study. J Endod 34:212–215PubMedCrossRefGoogle Scholar
  166. Rice RT, Gilbert BO Jr (1987) An unusual canal configuration in a mandibular first molar. J Endod 13:515–515PubMedCrossRefGoogle Scholar
  167. Ricucci D, Siqueira JF Jr (2010) Fate of the tissue in lateral canals and apical ramifications in response to pathologic conditions and treatment procedures. J Endod 36:1–15PubMedCrossRefGoogle Scholar
  168. Ridell K, Mejare I, Matsson L (2001) Dens invaginatus: a retrospective study of prophylactic invagination treatment. Int J Paediatr Dent 11:92–97PubMedCrossRefGoogle Scholar
  169. Robertson D, Leeb IJ, McKee M, Brewer E (1980) A clearing technique for the study of root canal systems. J Endod 6:421–424PubMedCrossRefGoogle Scholar
  170. Robinson S, Czerny C, Gahleitner A, Bernhart T, Kainberger FM (2002) Dental CT evaluation of mandibular first premolar root configurations and canal variations. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 93:328–332PubMedCrossRefGoogle Scholar
  171. Rocha LF, Sousa Neto MD, Fidel SR, da Costa WF, Pécora JD (1996) External and internal anatomy of mandibular molars. Braz Dent J 7:33–40PubMedGoogle Scholar
  172. Rotstein I, Stabholz A, Heling I, Friedman S (1987) Clinical considerations in the treatment of dens invaginatus. Endod Dent Traumatol 3:249–254PubMedCrossRefGoogle Scholar
  173. Ruprecht A, Sastry KA, Batniji S, Lambourne A (1987) The clinical significance of dental invagination. J Pedod 11:176–181PubMedGoogle Scholar
  174. Schäfer E, Diez C, Hoppe W, Tepel J (2002) Roentgenographic investigation of frequency and degree of canal curvatures in human permanent teeth. J Endod 28:211–216PubMedCrossRefGoogle Scholar
  175. Schneider SW (1971) A comparison of canal preparations in straight and curved root canals. Oral Surg Oral Med Oral Pathol 32:271–275PubMedCrossRefGoogle Scholar
  176. Seltzer S, Bender IB, Nazimov H, Sinai I (1967) Pulpitis-induced interradicular periodontal changes in experimental animals. J Periodontol 38:124–129PubMedCrossRefGoogle Scholar
  177. Seo DG, Gu Y, Yi YA et al (2012) A biometric study of C-shaped root canal systems in mandibular second molars using cone-beam computed tomography. Int Endod J 45:807–814PubMedCrossRefGoogle Scholar
  178. Sert S, Bayirli GS (2004) Evaluation of the root canal configurations of the mandibular and maxillary permanent teeth by gender in the Turkish population. J Endod 30:391–398PubMedCrossRefGoogle Scholar
  179. Sert S, Bayrl G (2004) Taurodontism in six molars: a case report. J Endod 30:601–602PubMedCrossRefGoogle Scholar
  180. Sharma R, Pécora JD, Lumley PJ, Walmsley AD (1998) The external and internal anatomy of human mandibular canine teeth with two roots. Endod Dent Traumatol 14:88–92PubMedCrossRefGoogle Scholar
  181. Shaw JC (1928) Taurodont teeth in South African races. J Anat 62:476–498PubMedCentralPubMedGoogle Scholar
  182. Shearer AC, Wasti F, Wilson NH (1996) The use of a radiopaque contrast medium in endodontic radiography. Int Endod J 29:95–98PubMedCrossRefGoogle Scholar
  183. Shemesh H, van Soest G, Wu MK, van der Sluis LW, Wesselink PR (2007) The ability of optical coherence tomography to characterize the root canal walls. J Endod 33:1369–1373PubMedCrossRefGoogle Scholar
  184. Shen Y, Gao Y, Lin J, Ma J, Wang Z, Haapasalo M (2012) Methods and models to study irrigation. Endod Topics 27:3–34CrossRefGoogle Scholar
  185. Shenoi RP, Ghule HM (2012) CBVT analysis of canal configuration of the mesio-buccal root of maxillary first permanent molar teeth: an in vitro study. Contemp Clin Dent 3:277–281PubMedCentralPubMedCrossRefGoogle Scholar
  186. Sidow SJ, West LA, Liewehr FR, Loushine RJ (2000) Root canal morphology of human maxillary and mandibular third molars. J Endod 26:675–678PubMedCrossRefGoogle Scholar
  187. Siqueira JF Jr (2005) Reaction of periradicular tissues to root canal treatment: benefits and drawbacks. Endod Topics 10:123–147CrossRefGoogle Scholar
  188. Siqueira JF Jr, Alves FRF, Versiani MA et al (2013) Correlative bacteriologic and micro–computed tomographic analysis of mandibular molar mesial canals prepared by Self-Adjusting File, Reciproc, and Twisted File systems. J Endod 39:1044–1050PubMedCrossRefGoogle Scholar
  189. Solomonov M, Paque F, Fan B, Eilat Y, Berman LH (2012) The challenge of C-shaped canal systems: a comparative study of the self-adjusting file and ProTaper. J Endod 38:209–214PubMedCrossRefGoogle Scholar
  190. Sousa Neto MD, Paiva EP, Saquy PC, Pécora JD (1998) Treatment of dens invaginatus in supernumerary teeth. Aust Endod J 24:85–87PubMedCrossRefGoogle Scholar
  191. Sustercic D, Sersa I (2012) Human tooth pulp anatomy visualization by 3D magnetic resonance microscopy. Radiol Oncol 46:1–7PubMedCentralPubMedCrossRefGoogle Scholar
  192. Sykaras SN (1971) Endodontic treatment of teeth with variations of the root canals. J Br Endod Soc 5:28–31PubMedCrossRefGoogle Scholar
  193. Szabo BT, Pataky L, Mikusi R, Fejerdy P, Dobo-Nagy C (2012) Comparative evaluation of cone-beam CT equipment with micro-CT in the visualization of root canal system. Ann Ist Super Sanita 48:49–52PubMedGoogle Scholar
  194. Tachibana H, Matsumoto K (1990) Applicability of X-ray computerized tomography in endodontics. Endod Dent Traumatol 6:16–20PubMedCrossRefGoogle Scholar
  195. Tanasiewicz M (2010) Magnetic resonance imaging in human teeth internal space requirements for visualization of dental prosthetics. J Exp Clin Dent 2:19–24Google Scholar
  196. Teixeira FB, Sano CL, Gomes BP, Zaia AA, Ferraz CC, Souza-Filho FJ (2003) A preliminary in vitro study of the incidence and position of the root canal isthmus in maxillary and mandibular first molars. Int Endod J 36:276–280PubMedCrossRefGoogle Scholar
  197. Tian YY, Guo B, Zhang R et al (2012) Root and canal morphology of maxillary first premolars in a Chinese subpopulation evaluated using cone-beam computed tomography. Int Endod J 45:996–1003PubMedCrossRefGoogle Scholar
  198. Tratman EK (1938) Three-rooted lower molars in man and their racial distribution. Br Dent J 64:264–274Google Scholar
  199. Tsesis I, Shifman A, Kaufman AY (2003) Taurodontism: an endodontic challenge. Report of a case. J Endod 29:353–355PubMedCrossRefGoogle Scholar
  200. Turner CGN (1971) Three-rooted mandibular first permanent molars and the question of American Indian origins. Am J Phys Anthropol 34:229–241PubMedCrossRefGoogle Scholar
  201. Venturi M, Prati C, Capelli G, Falconi M, Breschi L (2003) A preliminary analysis of the morphology of lateral canals after root canal filling using a tooth-clearing technique. Int Endod J 36:54–63PubMedCrossRefGoogle Scholar
  202. Versiani MA, Pécora JD, Sousa-Neto MD (2011a) The anatomy of two-rooted mandibular canines determined using micro-computed tomography. Int Endod J 44:682–687PubMedCrossRefGoogle Scholar
  203. Versiani MA, Pécora JD, de Sousa-Neto MD (2011b) Flat-oval root canal preparation with self-adjusting file instrument: a micro-computed tomography study. J Endod 37(7):1002–1007PubMedCrossRefGoogle Scholar
  204. Versiani MA, Sousa-Neto MD, Pécora JD (2011c) Pulp pathosis in inlayed teeth of the ancient Mayas: a microcomputed tomography study. Int Endod J 44(11):1000–1004PubMedCrossRefGoogle Scholar
  205. Versiani MA, Pécora JD, Sousa-Neto MD (2012) Root and root canal morphology of four-rooted maxillary second molars: a micro-computed tomography study. J Endod 38:977–982PubMedCrossRefGoogle Scholar
  206. Versiani MA, Cristescu RC, Saquy PC, Pécora JD, de Sousa-Neto MD (2013a) Enamel pearls in permanent dentition: case report and micro-CT evaluation. Dentomaxillofac Radiol 42(6):20120332PubMedCentralPubMedCrossRefGoogle Scholar
  207. Versiani MA, Leoni GB, Steier L, De-Deus G, Tassani S, Pécora JD, de Sousa-Neto MD (2013b) Microcomputed tomography study of oval-shaped canals prepared with the self-adjusting file, Reciproc, WaveOne, and ProTaper universal systems. J Endod 39(8):1060–1066PubMedCrossRefGoogle Scholar
  208. Versiani MA, Pécora JD, Sousa-Neto MD (2013c) Microcomputed tomography analysis of the root canal morphology of single-rooted mandibular canines. Int Endod J 46:800–807PubMedCrossRefGoogle Scholar
  209. Versiani MA, De-Deus G, Vera J, Souza E, Steier L, Pécora JD, Sousa-Neto MD (2015) 3D mapping of the irrigated areas of the root canal space using micro-computed tomography. Clin Oral Investig 19(4):859–866PubMedCrossRefGoogle Scholar
  210. Vertucci FJ, Williams RG (1974) Furcation canals in the human mandibular first molar. Oral Surg Oral Med Oral Pathol 38:308–314PubMedCrossRefGoogle Scholar
  211. Vertucci F, Seelig A, Gillis R (1974) Root canal morphology of the human maxillary second premolar. Oral Surg Oral Med Oral Pathol 38:456–464PubMedCrossRefGoogle Scholar
  212. Vertucci FJ (1984) Root canal anatomy of the human permanent teeth. Oral Surg Oral Med Oral Pathol 58:589–599PubMedCrossRefGoogle Scholar
  213. Vertucci FJ, Anthony RL (1986) A scanning electron microscopic investigation of accessory foramina in the furcation and pulp chamber floor of molar teeth. Oral Surg Oral Med Oral Pathol 62:319–326PubMedCrossRefGoogle Scholar
  214. Vertucci FJ (2005) Root canal morphology and its relationship to endodontic procedures. Endod Topics 10:3–29CrossRefGoogle Scholar
  215. Villas-Boas MH, Bernardineli N, Cavenago BC et al (2011) Micro-computed tomography study of the internal anatomy of mesial root canals of mandibular molars. J Endod 37:1682–1686PubMedCrossRefGoogle Scholar
  216. von Arx T (2005) Frequency and type of canal isthmuses in first molars detected by endoscopic inspection during periradicular surgery. Int Endod J 38:160–168CrossRefGoogle Scholar
  217. Wang Y, Zheng QH, Zhou XD et al (2010) Evaluation of the root and canal morphology of mandibular first permanent molars in a western Chinese population by cone-beam computed tomography. J Endod 36:1786–1789PubMedCrossRefGoogle Scholar
  218. Wang Q, Yu G, Zhou XD, Peters OA, Zheng QH, Huang DM (2011) Evaluation of x-ray projection angulation for successful radix entomolaris diagnosis in mandibular first molars in vitro. J Endod 37:1063–1068PubMedCrossRefGoogle Scholar
  219. Weine FS, Healey HJ, Gerstein H, Evanson L (1969) Canal configuration in the mesiobuccal root of the maxillary first molar and its endodontic significance. Oral Surg Oral Med Oral Pathol 28:419–425PubMedCrossRefGoogle Scholar
  220. Weine FS, Pasiewicz RA, Rice RT (1988) Canal configuration of the mandibular second molar using a clinically oriented in vitro method. J Endod 14:207–213PubMedCrossRefGoogle Scholar
  221. Weine FS (1996) Endodontic therapy, 5th edn. Mosby-Yearbook, St. LouisGoogle Scholar
  222. Weller RN, Niemczyk SP, Kim S (1995) Incidence and position of the canal isthmus. Part 1. Mesiobuccal root of the maxillary first molar. J Endod 21:380–383PubMedCrossRefGoogle Scholar
  223. Weng XL, Yu SB, Zhao SL et al (2009) Root canal morphology of permanent maxillary teeth in the Han nationality in Chinese Guanzhong area: a new modified root canal staining technique. J Endod 35:651–656PubMedCrossRefGoogle Scholar
  224. Woelfel JB, Scheid RC (2002) Dental anatomy: its relevance to dentistry, 6th edn. Lippincott Williams & Wilkins, PhiladelphiaGoogle Scholar
  225. Wu MK, R'Oris A, Barkis D, Wesselink PR (2000) Prevalence and extent of long oval canals in the apical third. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 89:739–743PubMedCrossRefGoogle Scholar
  226. Yang ZP, Yang SF, Lin YC, Shay JC, Chi CY (1988a) C-shaped root canals in mandibular second molars in a Chinese population. Endod Dent Traumatol 4:160–163PubMedCrossRefGoogle Scholar
  227. Yang ZP, Yang SF, Lee G (1988b) The root and root canal anatomy of maxillary molars in a Chinese population. Endod Dent Traumatol 4:215–218PubMedCrossRefGoogle Scholar
  228. Yilmaz Z, Tuncel B, Serper A, Calt S (2006) C-shaped root canal in a maxillary first molar: a case report. Int Endod J 39:162–166PubMedCrossRefGoogle Scholar
  229. Yu X, Guo B, Li KZ et al (2012) Cone-beam computed tomography study of root and canal morphology of mandibular premolars in a western Chinese population. BMC Med Imaging 12:18PubMedCentralPubMedCrossRefGoogle Scholar
  230. Zhang R, Yang H, Yu X, Wang H, Hu T, Dummer PM (2011a) Use of CBCT to identify the morphology of maxillary permanent molar teeth in a Chinese subpopulation. Int Endod J 44:162–169PubMedCrossRefGoogle Scholar
  231. Zhang R, Wang H, Tian YY, Yu X, Hu T, Dummer PM (2011b) Use of cone-beam computed tomography to evaluate root and canal morphology of mandibular molars in Chinese individuals. Int Endod J 44:990–999PubMedCrossRefGoogle Scholar
  232. Zheng Q, Zhang L, Zhou X et al (2011) C-shaped root canal system in mandibular second molars in a Chinese population evaluated by cone-beam computed tomography. Int Endod J 44:857–862PubMedCrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Department of EndodonticsDental School of Ribeirão Preto, University of São PauloSão PauloBrazil
  2. 2.Dental School of BauruUniversity of São PauloSão PauloBrazil

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