Cross-sectional morphology and minimum canal wall widths in C-shaped roots of mandibular molars

Chai, W.L. and Thong, Y.L. (2004) Cross-sectional morphology and minimum canal wall widths in C-shaped roots of mandibular molars. Journal of Endodontics, 30 (7). pp. 509-512. ISSN 0099-2399 , DOI


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The cross-sectional canal morphology and minimum widths of buccal and lingual canal walls were studied in 20 mandibular molars with C-shaped roots and canal orifices. The roots were mounted in clear resin blocks and sectioned transversely at 1-mm intervals. A total of 154 cross-sections were evaluated with an image analyzer. Twelve different longitudinal canal configurations were identified. The most prevalent were types 1-2 and 1-2-1 with each type occurring in four roots. Evaluation of the cross-sectional morphology showed that the configurations were complete "C" (27), incomplete C (64), and non-C (9). The mean value for the minimum width of the lingual canal wall was 0.58 ± 0.21 mm and the buccal wall was 0.96 ± 0.26 mm. This suggests that there is a higher risk of root perforation at the thinner lingual walls of C-shaped canals during shaping and post canal preparation procedures. Both buccal and lingual canal walls were frequently narrower at mesial locations.

Item Type: Article
Additional Information: Cited By (since 1996): 11 Export Date: 5 April 2012 Source: Scopus CODEN: JOEND PubMed ID: 15220648 Language of Original Document: English Correspondence Address: Chai, W.L.; General Dental Practice Unit, Faculty of Dentistry, University of Malaya, 50603 Kuala Lumpur, Malaysia; email: References: Walker, R.T., Root form and canal anatomy of mandibular second molars in a southern Chinese population (1988) J Endodon, 14, pp. 325-329; Yang, Z.P., Yang, S.F., Lin, Y.C., Shay, J.C., Chi, C.Y., C-shaped root canals in mandibular second molars in a Chinese population (1988) Endod Dent Traumatol, 4, pp. 160-163; Manning, S.A., Root canal anatomy of mandibular second molars. Part II. C-shaped canals (1990) Int Endod J, 23, pp. 40-45; Melton, D.C., Krell, K.V., Fuller, M.W., Anatomical and histological features of C-shaped canals in mandibular second molars (1991) J Endodon, 17, pp. 384-388; Chen, N.N., Neo, J., Lim, K.C., Root canal morphology of mandibular second molars in Singapore Chinese (1992) J Dent Res, 71, p. 1123; Rou, W.J., Diau, M.H., Lee, I.C., Huang, T.J., Roan, R.T., Root canal system of mandibular permanent molars in a Chinese population (1994) J Endodon, 20, p. 208; Thong, Y.L., Abu Kasim, N.H., C-shaped root canals in single-rooted mandibular second molars of Malaysians (1995) J Dent Res, 74, p. 533; Weine, F.S., The C-shaped mandibular second molar: Incidence and other considerations. Members of the Arizona Endodontic Association (1998) J Endodon, 24, pp. 372-375; Abou-Rass, M., Frank, A.L., Glick, D.H., The anticurvature filing method to prepare the curved root canal (1980) J Am Dent Assoc, 101, pp. 792-794; Fujita, T., The measured criteria of tooth (1949) J Anthrop Soc Nippon, 61, pp. 1-6; Cooke III, H.G., Cox, F.L., C-shaped canal configurations in mandibular molars (1979) J Am Dent Assoc, 99, pp. 836-839; Weine, F.S., Pasiewicz, R.A., Rice, R.T., Canal configuration of the mandibular second molar using a clinically oriented in vitro method (1988) J Endodon, 14, pp. 207-213; Baisden, M.K., Kulild, J.C., Weller, R.N., Root canal configuration of the mandibular first premolar (1992) J Endodon, 18, pp. 505-508; Rice, R.T., Gilbert Jr., B.O., An unusual canal configuration in a mandibular first molar (1987) J Endodon, 13, pp. 513-515; Bolger, W.L., Schindler, W.G., A mandibular first molar with a C-shaped root configuration (1988) J Endodon, 14, pp. 515-519; Sidow, S.J., West, L.A., Liewehr, F.R., Loushine, R.J., Root canal morphology of human maxillary and mandibular third molars (2000) J Endodon, 26, pp. 675-678; Newton, C.W., McDonald, S., A C-shaped canal configuration in a maxillary first molar (1984) J Endodon, 10, pp. 397-399; Dankner, E., Friedman, S., Stabholz, A., Bilateral C-shape configuration in maxillary first molars (1990) J Endodon, 16, pp. 601-603; Yang, Z.P., Yang, S.F., Lee, G., The root and root canal anatomy of maxillary molars in a Chinese population (1988) Endod Dent Traumatol, 4, pp. 215-218; Sutalo, J., Simeon, P., Tarle, Z., "C"-shaped canal configuration of mandibular second permanent molar (1998) Coll Antropol, 22, pp. 179-186
Uncontrolled Keywords: adult article cheek mucosa controlled study female frequency analysis high risk population human human tissue image analysis male mandible molar tooth morphology perforation prevalence risk assessment tooth root tooth root canal Anatomy, Cross-Sectional Dental Pulp Cavity Humans Image Processing, Computer-Assisted Microscopy, Video Middle Aged Molar Odontometry Videotape Recording
Subjects: R Medicine > RK Dentistry
Divisions: Faculty of Dentistry > Dept of General Dental Practice And Oral & Maxillofacial Imaging
Depositing User: Associate Professor Dr. Wen Lin Chai
Date Deposited: 08 May 2012 04:35
Last Modified: 08 May 2012 04:35

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