title: Comparative Analysis of Root Dentin Morphology and Structure of Human Versus Bovine Primary Teeth.
abstract: This study evaluated the structural and morphological differences between human and bovine primary root canals. Primary human maxillary central incisors (H) (n=9) and primary bovine incisors (B) (n=9) were selected. The roots were sectioned in the vestibular-lingual direction, planed and delimited in cervical, middle, and apical thirds. Tubule density (number of tubules per mm2) and diameter were analyzed by scanning electron microscopy (1,000 and 5,000×) using Image J 1.47 software. Data were submitted to two-way repeated measures ANOVA and Tukey tests (α=0.05). The highest tubule density was observed for B (28.527±1.717 mm2) compared with H (15.931±0.170 mm2) (p<0.01). Regarding root thirds, the cervical third presented a greater tubule density (26.417±11.654 mm2) than the apical third (17.999±5.873 mm2). The diameter of the dentin tubules was not different for cervical (3.50±0.08 µm), middle (3.45±0.30 µm) and apical thirds (3.42±0.33 µm) and substrate (H-3.29±0.14 µm; B-3.63±0.06 µm). It could be concluded that: (1) the radicular dentin structure of human and bovine primary teeth and root thirds differ in terms of the tubule density; (2) the radicular dentin morphology of human and bovine primary teeth and root thirds are similar in terms of the diameter of the dentin tubules.
authors.affiliation: Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil.
authors.forename: Bruna M
authors.initials: BM
authors.lastname: Costa
authors.affiliation: Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil.
authors.forename: Alexsandra S
authors.initials: AS
authors.lastname: Iwamoto
authors.affiliation: Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil.
authors.forename: Regina M
authors.initials: RM
authors.lastname: Puppin-Rontani
authors.affiliation: Pediatric Dentistry Department,Piracicaba Dental School,University of Campinas,Av. Limeira, 901,Piracicaba,SP 13414-903,Brazil.
authors.forename: Fernanda M
authors.initials: FM
authors.lastname: Pascon
mesh_terms: D000818:Animals; D002417:Cattle; D003804:Dentin / Q000648:ultrastructure*; D006801:Humans; D007180:Incisor / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D014092:Tooth Root / Q000648:ultrastructure*; D014094:Tooth, Deciduous / Q000648:ultrastructure*
keywords: bovine; human; primary teeth; root canal; scanning electron microscopy