title: Cross-sectional morphology and minimum canal wall widths in C-shaped roots of mandibular molars.
abstract: 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.
authors.affiliation: General Dental Practice Unit, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia. chaiwl@um.edu.my
authors.forename: Wen Lin
authors.initials: WL
authors.lastname: Chai
authors.forename: Yo Len
authors.initials: YL
authors.lastname: Thong
mesh_terms: D000328:Adult; D019412:Anatomy, Cross-Sectional; D003786:Dental Pulp Cavity / Q000473:pathology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008334:Mandible; D018715:Microscopy, Video; D008875:Middle Aged; D008963:Molar / Q000473:pathology*; D009811:Odontometry; D014092:Tooth Root / Q000473:pathology*; D014743:Videotape Recording