H. Ahmed, N. Abu-bakr, N. Yahia, and Y. Ibrahim, Root and canal morphology of permanent mandibular molars in a Sudanese population, International Endodontic Journal, vol.14, issue.10, pp.766-771, 2007.
DOI : 10.1111/j.1600-9657.1988.tb00315.x

E. Amos, Incidence of bifurcated root canals in mandibular bicuspid, Journal of the American Dental Association, vol.50, p.70, 1955.

K. Al-fouzan, H. Ounis, K. Merdad, and K. Hezaimi, Incidence of canal systems in the mesio-buccal roots of maxillary first and second molars in Saudi Arabian population, Australian Endodontic Journal, vol.23, issue.3, pp.98-101, 2013.
DOI : 10.1111/j.1747-4477.2010.00289.x

A. Al-qudah and L. Awawdeh, Root canal morphology of mandibular incisors in a Jordanian population, International Endodontic Journal, vol.21, issue.11, pp.873-877, 2006.
DOI : 10.1046/j.1365-2591.1999.00186.x

L. Awawdeh and A. Qudah, Root form and canal morphology of mandibular premolars in a Jordanian population, International Endodontic Journal, vol.97, issue.3, pp.240-248, 2008.
DOI : 10.1016/0030-4220(73)90147-3

M. Baisden, Root canal configuration of the mandibular first premolar, Journal of Endodontics, vol.18, issue.10, pp.505-513, 1992.
DOI : 10.1016/S0099-2399(06)81352-X

J. Barbizan, R. Ribeiro, and M. Filho, Unusual Anatomy of Permanent Maxillary Molars, Journal of Endodontics, vol.30, issue.9, pp.668-71, 2004.
DOI : 10.1097/01.DON.0000121618.45515.5A

M. Barrett, The internal anatomy of the teeth with special reference to the pulp with its branches, Dental Cosmos, vol.67, pp.581-92, 1925.

R. Bellizzi and G. Hartwell, Radiographic evaluation of root canal anatomy of in vivo endodontically treated maxillary premolars, Journal of Endodontics, vol.11, issue.1, pp.37-46, 1985.
DOI : 10.1016/S0099-2399(85)80104-7

K. Benjamin and J. Dowson, Incidence of two root canals in human mandibular incisor teeth. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.38, pp.122-128, 1974.

B. Bolhari, H. Assadian, and T. Fattah, Evaluation of the root canal morphology of mandibular second premolars in an Iranian population, Journal of Dentistry, vol.10, pp.516-521, 2013.

J. Bond, G. Hartwell, and F. Portell, Maxillary first molar with six canals, Journal of Endodontics, vol.14, issue.5, pp.258-60, 1988.
DOI : 10.1016/S0099-2399(88)80180-8

Y. Boucher, L. Matossian, F. Rilliard, and P. Machtou, Radiographic evaluation of the prevalence and technical quality of root canal treatment in a French subpopulation, International Endodontic Journal, vol.4, issue.3, pp.229-238, 2002.
DOI : 10.1046/j.1365-2591.1997.00092.x

D. Bulut, E. Kose, G. Ozcan, A. Sekerci, E. Canger et al., Evaluation of root morphology and root canal configuration of premolars in the Turkish individuals using cone beam computed tomography, European Journal of Dentistry, vol.9, pp.551-557, 2015.

R. Burnes, R. Herbranson, S. Cohen, and R. Burnes, Tooth morphology and cavity preparation, Pathways of the pulp 7 th edn, pp.150-202, 1998.

M. Caliskan, Y. Pehlivan, F. Sepetcioglu, M. Turkun, and S. Tuncer, Root canal morphology of human permanent teeth in a Turkish population, Journal of Endodontics, vol.21, issue.4, pp.200-204, 1995.
DOI : 10.1016/S0099-2399(06)80566-2

P. Cambon, Etude anatomique des canaux aberrants des molaires et des prémolaires permanentes. Revue Française, pp.1359-74, 1967.

A. Caumontat, Etude statistique de la morphologie canalaire de la deuxième prémolaire maxillaire (Thèse Chirurgie Dentaire), 1974.

P. Cecic, G. Hartwell, and R. Bellizzi, The multiple root canal system in the maxillary first molar: a case report, Journal of Endodontics, vol.8, issue.3, pp.113-118, 1982.
DOI : 10.1016/S0099-2399(82)80245-8

K. Chan, S. Yew, and S. Chao, Mandibular premolar with three root canals?two case reports, International Endodontic Journal, vol.4, issue.5, pp.261-265, 1992.
DOI : 10.1016/0030-4220(73)90147-3

B. Cleghorn, W. Christie, and C. Dong, The Root and Root Canal Morphology of the Human Mandibular First Premolar: A Literature Review, Journal of Endodontics, vol.33, issue.5, pp.509-516, 2007.
DOI : 10.1016/j.joen.2006.12.004

F. Covello, V. Franco, R. Schiavetti, M. Clementini, A. Mannocci et al., Prevalence of apical periodontitis and quality of endodontic treatment in an Italian adult population, Oral & Implantology, vol.3, pp.9-14, 2011.

D. Arcangelo, C. Varvara, G. , D. Fazio, and P. , Root canal treatment in mandibular canines with two roots: a report of two cases, International Endodontic Journal, vol.58, issue.4, pp.331-335, 2001.
DOI : 10.1046/j.1365-2591.2001.00376.x

S. Demirbuga, A. Sekerci, A. Dinçer, M. Cayabatmaz, and Y. Zorba, Use of cone-beam computed tomography to evaluate root and canal morphology of mandibular first and second molars in Turkish individuals, Medicina Oral Patolog??a Oral y Cirugia Bucal, vol.18, pp.737-744, 2013.
DOI : 10.4317/medoral.18473

D. Filippo, G. Sidhu, S. Chong, and B. , Apical periodontitis and the technical quality of root canal treatment in an adult sub-population in London, BDJ, vol.201, issue.10, p.22, 2014.
DOI : 10.1038/sj.bdj.2014.404

A. Dutta, F. Smith-jack, and W. Saunders, Prevalence of periradicular periodontitis in a Scottish subpopulation found on CBCT images, International Endodontic Journal, vol.12, issue.9, pp.854-863, 2014.
DOI : 10.1111/iej.12228

H. Fogel, M. Peikoff, and W. Christie, Canal configuration in the mesiobuccal root of the maxillary first molar: A clinical study, Journal of Endodontics, vol.20, issue.3, pp.135-142, 1994.
DOI : 10.1016/S0099-2399(06)80059-2

F. Frisk, A. Hugoson, and M. Hakeberg, Technical quality of root fillings and periapical status in root filled teeth in J??nk??ping, Sweden, International Endodontic Journal, vol.14, issue.Suppl. 21, pp.958-968, 2008.
DOI : 10.1111/j.1365-2591.2008.01457.x

P. Geider, Recherche sur l'anatomie endodontique des prémolaires inférieures : à propos de 669 cas, JOC, pp.11-16, 1989.

M. Georgopoulou, A. Spanaki-voreadi, N. Pantazis, and E. Kontakiotis, Frequency and distribution of root filled teeth and apical periodontitis in a Greek population, International Endodontic Journal, vol.13, issue.2, pp.105-111, 2005.
DOI : 10.1046/j.1365-2591.1998.00136.x

D. Green, Double canals in single roots Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.35, pp.689-96, 1973.

J. Guo, A. Vahidnia, P. Sedghizadeh, and R. Enciso, Evaluation of Root and Canal Morphology of Maxillary Permanent First Molars in a North American Population by??Cone-beam Computed Tomography, Journal of Endodontics, vol.40, issue.5, pp.635-639, 2014.
DOI : 10.1016/j.joen.2014.02.002

T. Han, Y. Ma, L. Yang, X. Chen, X. Zhang et al., A Study of the Root Canal Morphology of Mandibular Anterior Teeth Using Cone-beam Computed Tomography in a Chinese Subpopulation, Journal of Endodontics, vol.40, issue.9, pp.1309-1314, 2014.
DOI : 10.1016/j.joen.2014.05.008

W. Harris, Unusual root canal anatomy in a maxillary molar, Journal of Endodontics, vol.6, issue.5, pp.573-578, 1980.
DOI : 10.1016/S0099-2399(80)80154-3

W. Hess, The anatomy of the root canals of the teeth in the permanent dentition, 1925.

R. Hession, Endodontic morphology. II. A radiographic analysis Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.44, pp.610-630, 1977.

M. Hulsmann, Mandibular first premolar with three root canals, Dental Traumatology, vol.36, issue.4, pp.189-91, 1990.
DOI : 10.1016/0030-4220(73)90037-6

I. Jersa and R. Kundzina, Periapical status and quality of root fillings in a selected adult Riga population, Stomatologija, vol.15, pp.73-77, 2013.

A. Jiménez-pinzón, J. Segura-egea, M. Poyato-ferrera, E. Velasco-ortega, and J. Ríos-santos, Prevalence of apical periodontitis and frequency of root-filled teeth in an adult Spanish population, International Endodontic Journal, vol.13, issue.3, pp.167-173, 2004.
DOI : 10.1111/j.0143-2885.2004.00759.x

Y. Jing, X. Ye, D. Liu, Z. Zhang, and X. Ma, [Cone-beam computed tomography was used for study of root and canal morphology of maxillary first and second molars], Health Sciences, vol.46, pp.958-962, 2014.

S. Johal, Unusual Maxillary First Molar with 2 Palatal Canals Within a Single Root: A Case Report, Journal of the Canadian Dental Association, vol.67, pp.211-215, 2001.

Y. Kabak and P. Abbott, Prevalence of apical periodontitis and the quality of endodontic treatment in an adult Belarusian population, International Endodontic Journal, vol.13, issue.4, pp.238-245, 2005.
DOI : 10.1034/j.1600-9657.2000.016005218.x

B. Kamberi, V. Hoxha, M. Stavileci, E. Dragusha, A. Kuci et al., Prevalence of apical periodontitis and endodontic treatment in a Kosovar adult population, BMC Oral Health, vol.2, issue.3, p.32, 2011.
DOI : 10.1111/j.1600-9657.1986.tb00134.x

M. Kazemipoor, M. Poorkheradmand, M. Rezaeian, and Y. Safi, Evaluation by CBCT of Root and Canal Morphology in Mandibular Premolars in an Iranian Population. The Chinese journal of dental research: the official journal of the Scientific Section of the Chinese Stomatological Association (CSA, pp.191-196, 2015.

K. Kerekes, Morphometric observations on root canals of human premolars, Journal of Endodontics, vol.3, issue.2, pp.74-83, 1977.
DOI : 10.1016/S0099-2399(77)80019-8

A. Khraisat and L. Smadi, Canal configuration in the mesio-buccal root of maxillary first molar teeth of a Jordanian population, Australian Endodontic Journal, vol.52, issue.1, pp.13-17, 2007.
DOI : 10.1067/moe.2002.118285

Y. Kim, S. Lee, and J. Woo, 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, Journal of Endodontics, vol.38, issue.8, pp.1063-1068, 2012.
DOI : 10.1016/j.joen.2012.04.025

L. Kirkevang, P. Hörsted-bindslev, D. Ørstavik, and A. Wenzel, A comparison of the quality of root canal treatment in two Danish subpopulations examined 1974-75 and 1997-98, International Endodontic Journal, vol.98, issue.8, pp.607-612, 2001.
DOI : 10.1046/j.1365-2591.1997.00092.x

L. Kirkevang, M. Vaeth, and A. Wenzel, Ten-year follow-up observations of periapical and endodontic status in a Danish population, International Endodontic Journal, vol.36, issue.Suppl 3, pp.829-839, 2012.
DOI : 10.1111/j.1365-2591.2012.02040.x

J. Kulid and D. Peters, Incidence and configuration of canal systems in the mesiobuccal root of Maxillary first and second molars, Journal of Endodontics, vol.16, issue.7, pp.311-318, 1990.
DOI : 10.1016/S0099-2399(06)81940-0

M. Kuzekanani and E. Asgari, The incidence of mandibular first premolar teeth with 2 canals in a group of Kerman population, Shahid Beheshti University Dental Journal, vol.23, pp.286-293, 2002.

K. Lahlou, M. Jabri, R. Mennani, and J. Lasfargues, Anatomie endodontique des secondes prémolaires maxillaires, Information Dentaire, vol.78, pp.2493-501, 1996.

A. Laws, Prevalence of canal irregularities in mandibular incisors: a radiographic study, New Zealand Dental Journal, vol.67, pp.181-187, 1971.

G. Leoni, M. Versiani, J. Pécora, D. De-sousa-neto, and M. , Micro???Computed Tomographic Analysis of the Root Canal Morphology of Mandibular Incisors, Journal of Endodontics, vol.40, issue.5, pp.710-716, 2014.
DOI : 10.1016/j.joen.2013.09.003

N. Liu, X. Li, N. Liu, A. J. Nie, X. Liu et al., A micro-computed tomography study of the root canal morphology of the mandibular first premolar in a population from southwestern China, Clinical Oral Investigations, vol.89, issue.12, pp.999-1007, 2013.
DOI : 10.1007/s00784-012-0778-1

C. Llena, J. Fernandez, P. Ortolani, and L. Forner, Cone-beam computed tomography analysis of root and canal morphology of mandibular premolars in a Spanish population, Imaging Science in Dentistry, vol.44, issue.3, pp.221-227, 2014.
DOI : 10.5624/isd.2014.44.3.221

J. Loftus, A. Keating, and B. Mccartan, Periapical status and quality of endodontic treatment in an adult Irish population, International Endodontic Journal, vol.13, issue.2, pp.81-86, 2005.
DOI : 10.1046/j.1365-2591.1998.00136.x

J. López-lópez, E. Jané-salas, A. Estrugo-devesa, L. Castellanos-cosano, J. Martín-gonzález et al., Frequency and distribution of root-filled teeth and apical periodontitis in an adult population of Barcelona, Spain, International Dental Journal, vol.30, issue.1, pp.40-46, 2012.
DOI : 10.1111/j.1875-595X.2011.00087.x

L. Lupi-pegurier, M. Bertrand, M. Muller-bolla, J. Rocca, and M. Bolla, Periapical status, prevalence and quality of endodontic treatment in an adult French population, International Endodontic Journal, vol.13, issue.8, pp.690-697, 2002.
DOI : 10.1046/j.1365-2591.1998.00136.x

A. Macari, Etude de l'anatomie canalaire des prémolaires inférieures (Thèse Chirurgie Dentaire), 1995.

S. Manning, Root canal anatomy of mandibular second molars. Part I, International Endodontic Journal, vol.4, issue.1, pp.34-43, 1990.
DOI : 10.1016/0030-4220(84)90085-9

S. Manning, Root canal anatomy of mandibular second molars., International Endodontic Journal, vol.4, issue.1, pp.40-45, 1990.
DOI : 10.1016/0030-4220(84)90085-9

A. Martinez-berna and P. Ruiz-badanelli, Maxillary first molars with six canals, Journal of Endodontics, vol.9, issue.9, pp.375-81, 1983.
DOI : 10.1016/S0099-2399(83)80188-5

M. Mbaye, B. Touré, A. Kane, F. Leye, K. Bane et al., Radiographic study of the canal anatomy of mandibular premolars in a Senegalese population], Dakar Medical, vol.53, pp.267-271, 2008.

A. Mueller, Anatomy of the Root Canals of the Incisors, Cuspids and Bicuspids of the Permanent Teeth**Read before The Odontographic Society of Chicago, Dec. 5, 1932., The Journal of the American Dental Association (1922), vol.20, issue.8, pp.1361-86, 1933.
DOI : 10.14219/jada.archive.1933.0229

M. Naseri, Y. Safi, A. Baghban, A. Khayat, A. Eftekhar et al., Survey of Anatomy and Root Canal Morphology of Maxillary First Molars Regarding Age and Gender in an Iranian Population Using Cone-Beam Computed Tomography, Iranian Endodontic Journal, vol.11, pp.298-303, 2016.

P. Neelakantan, C. Subbarao, R. Ahuja, C. Subbarao, and J. Gutmann, Cone-Beam Computed Tomography Study of Root and Canal Morphology of Maxillary First and Second Molars in an Indian Population, Journal of Endodontics, vol.36, issue.10, pp.1622-1627, 2010.
DOI : 10.1016/j.joen.2010.07.006

P. Neelakantan, C. Subbarao, R. Ahuja, and C. Subbarao, Root and canal morphology of Indian maxillary premolars by a modified root canal staining technique, Odontology, vol.9, issue.1, pp.18-21, 2011.
DOI : 10.1007/s10266-010-0137-0

Y. Ng, T. Aung, A. Alavi, and K. Gulabivala, Root and canal morphology of Burmese maxillary molars, International Endodontic Journal, vol.4, issue.8, pp.620-630, 2001.
DOI : 10.1046/j.1365-2591.1999.00186.x

E. Ok, M. Altunsoy, B. Nur, O. Aglarci, M. Çolak et al., A cone-beam computed tomography study of root canal morphology of maxillary and mandibular premolars in a Turkish population, Acta Odontologica Scandinavica, vol.97, issue.8, pp.701-706, 2014.
DOI : 10.1097/00004770-200406000-00004

T. Okumara, Anatomy of the root canals, Journal of the American Dental Association, vol.41, pp.632-638, 1927.

G. Ozcan, A. Sekerci, K. Cantekin, M. Aydinbelge, and S. Dogan, Evaluation of root canal morphology of human primary molars by using CBCT and comprehensive review of the literature, Acta Odontologica Scandinavica, vol.17, issue.4, pp.250-258, 2016.
DOI : 10.3923/rjbsci.2010.488.491

V. Parekh, N. Shah, and H. Joshi, Root Canal Morphology and Variations of Mandibular Premolars by Clearing Technique: An in vitro Study, The Journal of Contemporary Dental Practice, vol.12, pp.318-321, 2011.
DOI : 10.5005/jp-journals-10024-1052

J. Park, J. Lee, B. Ha, J. Choi, and H. Perinpanayagam, Three-dimensional analysis of maxillary first molar mesiobuccal root canal configuration and curvature using micro-computed tomography. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics, vol.108, pp.437-442, 2009.

N. Pattanshetti, M. Gaidhane, A. Kandari, and A. , Root and canal morphology of the mesiobuccal and distal roots of permanent first molars in a Kuwait population - a clinical study, International Endodontic Journal, vol.24, issue.9, pp.755-762, 2008.
DOI : 10.1111/j.1365-2591.2008.01427.x

J. Pecora, S. Neto, M. Saquy, P. Woelfel, and J. , In vitro study of root canal anatomy of maxillary second premolars, Brazilian Dental Journal, vol.3, pp.81-86, 1993.

H. Peeters, K. Suardita, and D. Setijanto, Prevalence of a second canal in the mesiobuccal root of permanent maxillary first molars from an Indonesian population, Journal of Oral Science, vol.53, issue.4, pp.489-494, 2011.
DOI : 10.2334/josnusd.53.489

H. Peiris, T. Pitakotuwage, M. Takahashi, K. Sasaki, and E. Kanazawa, Root canal morphology of mandibular permanent molars at different ages, International Endodontic Journal, vol.14, issue.10, pp.828-835, 2008.
DOI : 10.1111/j.1365-2591.2008.01428.x

F. Pineda and Y. Kuttler, Mesiodistal and buccolingual roentgenographic investigation of 7,275 root canals, Oral Surgery, Oral Medicine, Oral Pathology, vol.33, issue.1, pp.101-110, 1972.
DOI : 10.1016/0030-4220(72)90214-9

H. Pomeranz and G. Fishelberg, The secondary mesiobuccal canal of maxillary molars, The Journal of the American Dental Association, vol.88, issue.1, pp.119-143, 1974.
DOI : 10.14219/jada.archive.1974.0045

S. Rahimi, A. Milani, S. Shahi, Y. Sergiz, S. Nezafati et al., Prevalence of two root canals in human mandibular anterior teeth in an Iranian population, Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research, vol.24, pp.234-236, 2013.

R. Rankine-wilson and P. Henry, The Bifurcated Root Canal in Lower Anterior Teeth, The Journal of the American Dental Association, vol.70, issue.5, pp.1162-1167, 1965.
DOI : 10.14219/jada.archive.1965.0189

A. Reis, R. Grazziotin-soares, F. Barletta, V. Fontanella, and C. Mahl, Second Canal in Mesiobuccal Root of Maxillary Molars Is Correlated with Root Third and Patient Age: A Cone-beam Computed Tomographic Study, Journal of Endodontics, vol.39, issue.5, pp.588-592, 2013.
DOI : 10.1016/j.joen.2013.01.003

E. Revel, Etude de l'anatomie canalaire des incisives inférieures (Thèse Chirurgie Dentaire), 1994.

L. Rocha, S. Neto, M. Fidel, S. Da-costa, W. Pécora et al., External and internal anatomy of mandibular molars, Brazilian Dental Journal, vol.7, pp.33-40, 1996.

T. Rózy?o, M. Miazek, I. Rózy?o-kalinowska, and F. Burdan, Morphology of root canals in adult premolar teeth, Folia Morphologica, vol.67, pp.280-285, 2008.

R. Sandhya, N. Velmurugan, and D. Kandaswamy, Assessment of root canal morphology of mandibular first premolars in the Indian population using spiral computed tomography: an in vitro study, Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research, vol.21, pp.169-173, 2010.

T. Schwarze, C. Baethge, T. Stecher, and W. Geurtsen, Identification Of Second Canals In The Mesiobuccal Root Of Maxillary First And Second Molars Using Magnifying Loupes Or An Operating Microscope, Australian Endodontic Journal, vol.26, issue.2, pp.57-60, 2002.
DOI : 10.1111/j.1747-4477.2002.tb00379.x

B. Seidberg, M. Altman, J. Guttuso, and M. Suson, Frequency of Two Mesiobuccal Root Canals in Maxillary Permanent First Molars, The Journal of the American Dental Association, vol.87, issue.4, pp.852-858, 1973.
DOI : 10.14219/jada.archive.1973.0489

S. Sert, V. Aslanalp, and J. Tanalp, Investigation of the root canal configurations of mandibular permanent teeth in the Turkish population, International Endodontic Journal, vol.17, issue.7, pp.494-499, 2004.
DOI : 10.1046/j.1365-2591.1998.00126.x

S. Sert and G. Bayirli, Evaluation of the Root Canal Configurations of the Mandibular and Maxillary Permanent Teeth by Gender in the Turkish Population, Journal of Endodontics, vol.30, issue.6, pp.391-398, 2004.
DOI : 10.1097/00004770-200406000-00004

R. Sharma, J. Pecora, P. Lumley, and A. Walmsley, The external and internal anatomy of human mandibular canine teeth with two roots, Endodontics and Dental Traumatology, vol.14, pp.88-92, 1998.

S. Singh and M. Pawar, Root Canal Morphology of South Asian Indian Mandibular Premolar Teeth, Journal of Endodontics, vol.40, issue.9, pp.1338-1341, 2014.
DOI : 10.1016/j.joen.2014.03.021

A. Skidmore and A. Bjorndal, Root canal morphology of the human mandibular first molar, Oral Surgery, Oral Medicine, Oral Pathology, vol.32, issue.5, pp.778-784, 1971.
DOI : 10.1016/0030-4220(71)90304-5

J. Stopko, Canal morphology of maxillary molars: Clinical observations of canal configurations, Journal of Endodontics, vol.25, issue.6, pp.446-50, 1999.
DOI : 10.1016/S0099-2399(99)80276-3

H. Sunay, J. Tanalp, I. Dikbas, and G. Bayirli, Cross-sectional evaluation of the periapical status and quality of root canal treatment in a selected population of urban Turkish adults, International Endodontic Journal, vol.27, issue.2, pp.139-145, 2007.
DOI : 10.1046/j.1365-2591.2003.00711.x

R. Thomas, A. Moule, and R. Bryant, Root canal morphology of maxillary permanent first molar teeth at various ages, International Endodontic Journal, vol.15, issue.5, pp.257-67, 1993.
DOI : 10.1016/0030-4220(74)90142-X

M. Trope, Mandibular premolars with more than one root canal in different race groups, Journal of Endodontics, vol.12, issue.8, pp.343-388, 1986.
DOI : 10.1016/S0099-2399(86)80035-8

D. Van-der-veken, F. Curvers, S. Fieuws, and P. Lambrechts, Prevalence of apical periodontitis and root filled teeth in a Belgian subpopulation found on CBCT images, International Endodontic Journal, vol.52, issue.4, 2016.
DOI : 10.1111/iej.12631

N. Velmurugan and R. Sandhya, Root canal morphology of mandibular first premolars in an Indian population: a laboratory study, International Endodontic Journal, vol.36, issue.1, pp.54-58, 2009.
DOI : 10.1111/j.1365-2591.2008.01494.x

F. Vertucci, The endodontic significance of the mesiobuccal root of the maxillary first molar, US Navy Medecine, vol.63, pp.29-31, 1974.

F. Vertucci, Root canal morphology of mandibular premolars, The Journal of the American Dental Association, vol.97, issue.1, pp.47-50, 1978.
DOI : 10.14219/jada.archive.1978.0443

F. Vertucci, Root canal anatomy of the human permanent teeth Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.58, pp.589-99, 1984.

F. Vertucci, A. Seeling, and R. Gillis, Root canal morphology of the human second premolar. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.38, pp.456-64, 1975.

S. Vigouroux and S. Trugeda, Anatomy of the pulp chamber floor of the permanent maxillary first molar, Journal of Endodontics, vol.4, issue.7, pp.214-223, 1978.
DOI : 10.1016/S0099-2399(78)80186-1

F. Wasti, A. Shearer, and N. Wilson, Root canal systems of the mandibular and maxillary first permanent molar teeth of South Asian Pakistanis, International Endodontic Journal, vol.28, issue.4, pp.263-266, 2001.
DOI : 10.1046/j.1365-2591.1999.00186.x

F. Weine, Endodontic therapy, 5 th edn, 1994.

F. Weine, H. Healey, H. Gerstein, and L. Evanson, Canal configuration in the mesio-buccal root of the maxillary first molar and its endodontic significance. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.28, pp.419-444, 1969.

X. Weng, S. Yu, and S. Zhao, Root Canal Morphology of Permanent Maxillary Teeth in the Han Nationality in Chinese Guanzhong Area: A New Modified Root Canal Staining Technique, Journal of Endodontics, vol.35, issue.5, pp.651-656, 2009.
DOI : 10.1016/j.joen.2009.02.010

L. Yang, X. Chen, C. Tian, T. Han, and Y. Wang, Use of Cone-beam Computed Tomography to Evaluate Root Canal Morphology and Locate Root Canal Orifices of Maxillary Second Premolars in a Chinese Subpopulation, Journal of Endodontics, vol.40, issue.5, pp.630-634, 2014.
DOI : 10.1016/j.joen.2014.01.007

X. Yu, G. Guo, K. Li, R. Zhang, Y. Tian et al., Cone-beam computed tomography study of root and canal morphology of mandibular premolars in a western Chinese population, BMC Medical Imaging, vol.58, issue.2, p.18, 2012.
DOI : 10.1016/0030-4220(84)90085-9

E. Zaatar, S. Anizi, and . Duwairi, A study of the dental pulp cavity of mandibular first permanent molars in the Kuwaiti population, Journal of Endodontics, vol.24, issue.2, pp.125-127, 1998.
DOI : 10.1016/S0099-2399(98)80092-7

X. Zhang, S. Xiong, Y. Ma, T. Han, X. Chen et al., A Cone-Beam Computed Tomographic Study on Mandibular First Molars in a Chinese Subpopulation, PLOS ONE, vol.17, issue.8, p.134919, 2015.
DOI : 10.1371/journal.pone.0134919.t006

R. Zillich and J. Dowson, Root canal morphology of mandibular first and second premolars. Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, vol.36, pp.738-782, 1973.