title: Morphology of Mesiobuccal Root Canals of Maxillary First Molars: a comparison of CBCT scanning and Cross-sectioning.
abstract: The aim of this study was to evaluate the mesiobuccal root of maxillary first molars, according to the root canal configuration, prevalence and location of isthmuses at 3 and 6 mm from the apex, comparing cone-beam computed tomography (CBCT) analysis and cross sectioning of roots by thirds. Images of the mesiobuccal root of 100 maxillary first molars were acquired by CBCT and then roots were cross-sectioned into two parts, starting at 3 mm from the apex. Data were recorded and analyzed according to Weine's classification for root canal configuration, and Hsu and Kim's classification for isthmuses. In the analysis of CBCT images, 8 root canals were classified as type I, 57 as type II, 35 as type III. In the cross-sectioning technique, 19 root canals were classified as type I, 60 as type II, 20 as type III and 1 as type IV. The classification of isthmuses was predominantly type I in both CBCT and cross-sectioning evaluations for sections at 3 mm from the apex, while for sections at 6 mm from the apex, the classification of isthmuses was predominantly types V and II in CBCT and cross-sectioning evaluations, respectively. The cross-sectioning technique showed better results in detection of the internal morphology of root canals than CBCT scanning.
authors.affiliation: Post-Graduate Program in Dentistry, ABO - Brazilian Dental Association, Florianópolis, SC, Brazil.
authors.forename: Carina Maria
authors.initials: CM
authors.lastname: Lyra
authors.affiliation: Post-Graduate Program in Dentistry, Dental School, UFRGS - Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
authors.forename: Débora
authors.initials: D
authors.lastname: Delai
authors.affiliation: Post-Graduate Program in Dentistry, ABO - Brazilian Dental Association, Florianópolis, SC, Brazil.
authors.forename: Keila Cristina Rausch
authors.initials: KC
authors.lastname: Pereira
authors.affiliation: Post-Graduate Program in Dentistry, ABO - Brazilian Dental Association, Florianópolis, SC, Brazil.
authors.forename: Guy Martins
authors.initials: GM
authors.lastname: Pereira
authors.affiliation: Post-Graduate Program in Dentistry, ABO - Brazilian Dental Association, Florianópolis, SC, Brazil.
authors.forename: Bráulio
authors.initials: B
authors.lastname: Pasternak Júnior
authors.affiliation: Post-Graduate Program in Dentistry, ABO - Brazilian Dental Association, Florianópolis, SC, Brazil.
authors.forename: César Augusto Pereira
authors.initials: CA
authors.lastname: Oliveira
mesh_terms: D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003786:Dental Pulp Cavity / Q000033:anatomy & histology*; D006801:Humans; D008437:Maxilla / Q000033:anatomy & histology*; D008963:Molar / Q000033:anatomy & histology*