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Vertucci FJ (1984) Root canal anatomy of the human permanent teeth. Oral Surg Oral Med Oral Pathol 58, 589-599.","DOI":"10.1016\/0030-4220(84)90085-9"},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Plotino G, Tocci L, Grande NM, Testarelli L, Messineo D, Ciotti M et al. (2013) Symmetry of root and root canal morphology of maxillary and mandibular molars in a white population: a cone-beam computed tomography study in vivo. J Endod 39, 1545-1548.","DOI":"10.1016\/j.joen.2013.09.012"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Zheng Q, Zhang L, Zhou X, Wang Q, Wang Y, Tang L 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, 857-862.","DOI":"10.1111\/j.1365-2591.2011.01896.x"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Seo DG, Gu Y, Yi YA, Lee SJ, Jeong JS, Lee Y et al. 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Buchanan GD, Gamieldien MY, Fabris-Rotelli I, Van Schoor A, Uys A (2022) Root and canal morphology of maxillary second molars in a black South African subpopulation using cone-beam computed tomography and two classifications. Aust Endod J, Nov 14, doi: 10.1111\/aej.12720.","DOI":"10.1111\/aej.12720"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12. 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, 391-398.","DOI":"10.1097\/00004770-200406000-00004"},{"key":"13","doi-asserted-by":"crossref","unstructured":"13. Ahmed HMA, Versiani MA, De-Deus G, Dummer PMH (2017) A new system for classifying root and root canal morphology. Int Endod J 50, 761-770.","DOI":"10.1111\/iej.12685"},{"key":"14","doi-asserted-by":"crossref","unstructured":"14. Ahmed HMA (2022) A critical analysis of laboratory and clinical research methods to study root and canal anatomy. 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Rwenyonyi CM, Kutesa A, Muwazi LM, Buwembo W (2009) Root and canal morphology of mandibular first and second permanent molar teeth in a Ugandan population. Odontology 97, 92-96.","DOI":"10.1007\/s10266-009-0100-0"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29. Weine FS, Pasiewicz RA, Rice RT (1988) Canal configuration of the mandibular second molar using a clinically oriented in vitro method. J Endod 14, 207-213.","DOI":"10.1016\/S0099-2399(88)80171-7"},{"key":"30","doi-asserted-by":"crossref","unstructured":"30. Buchanan GD, Gamieldien MY, Fabris-Rotelli I, Van Schoor A, Uys A (2022) A study of mandibular premolar root and canal morphology in a black South African population using cone-beam computed tomography and two classification systems. J Oral Sci 64, 300-306.","DOI":"10.2334\/josnusd.22-0239"},{"key":"31","doi-asserted-by":"crossref","unstructured":"31. 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