title: Root and canal morphology of maxillary second molars by cone-beam computed tomography in a native Chinese population.
abstract: Objective To evaluate the root and root canal morphology of the maxillary second molars (MSMs) in a native Chinese population by cone-beam computed tomography. Methods Cone-beam computed tomography images of 2412 MSMs from 1294 Chinese patients were analyzed to determine the number and morphology of the roots, the root canal morphology, the bilateral symmetry, and the correlations of these parameters with sex and age. Results The percentage of fused roots increased with age, while the percentage of fused roots in women was higher than that in men. The percentage of second mesiobuccal (MB2) canals in MSMs with three separate roots was higher in men than women. Patients aged 31 to 40 years showed a higher prevalence of MB2 canals, while those aged ≥51 years showed the lowest prevalence of MB2 canals among both men and women. There was a significant difference in bilateral symmetry of MSMs between men and women. Conclusion Root fusion of MSMs increased with age, while the root canal morphology was more complex in patients of intermediate ages.
authors.affiliation: 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.|2 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Radiology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Daming
authors.initials: D
authors.lastname: Wu
authors.affiliation: 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Guangdong
authors.initials: G
authors.lastname: Zhang
authors.affiliation: 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Ruizhen
authors.initials: R
authors.lastname: Liang
authors.affiliation: 2 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Radiology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Guangchao
authors.initials: G
authors.lastname: Zhou
authors.affiliation: 1 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Endodontics, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Younong
authors.initials: Y
authors.lastname: Wu
authors.affiliation: 2 Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University; Department of Radiology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China.
authors.forename: Chao
authors.initials: C
authors.lastname: Sun
authors.affiliation: 3 The State Key Laboratory Breeding Base of Basic Science of Stomatology (Hubei-MOST) & Key Laboratory of Oral Biomedicine Ministry of Education, School & Hospital of Stomatology, Wuhan University, Wuhan, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Fan
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D044466:Asian People; D054893:Cone-Beam Computed Tomography; D003786:Dental Pulp Cavity / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D008875:Middle Aged; D008963:Molar / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D012737:Sex Factors; D014092:Tooth Root / Q000033:anatomy & histology* / Q000000981:diagnostic imaging
keywords: Cone-beam computed tomography; maxillary second molar; root canal morphology; root fusion