title: Dens invaginatus in ancient Chinese teeth of 2,000 years ago.
abstract: Dens invaginatus (DI) is a developmental anomaly of teeth. Here we observed the characteristics of DI in 517 permanent teeth from 67 ancient Chinese people using micro-computed tomography (micro-CT) scanning techniques. The individuals were excavated from Shaanxi province of China and identified to be about 2,000 years old. Four DI categories are proposed to distinguish the different types of DI. The invaginated lingual fossa is classified into three classes. The overall prevalence of DI in 67 individuals was 31.34% (21 of 67). DI was found in 25 of 517 teeth (4.83%). All affected teeth were maxillary lateral incisors. The invaginated lingual fossa (Type I DI) occurred most frequently (84%), followed by radicular grooves (Type II; 16%), while Type III and Type IV were not found in the present study. Some of fossae correspond with radicular grooves (8 of 21; 3 located at mesial, 5 were distal). The bilateral incidence of DI was 19.05%. Comparing our results to those of a retrospective survey of DI from 1873 to present, we found a higher rate of DI in the excavated teeth of Chinese individuals 2,000 years ago. The use of the micro-CT technique and ethnic origin might have contributed to the higher incidence of DI.
authors.affiliation: Department of Orthodontics School of Stomatology, Fourth Military Medical University, Xi'an, 710032, People's Republic of China; Department of Oral Biology School of Stomatology, Fourth Military Medical University, Xi'an, 710032, People's Republic of China.
authors.forename: Sasa
authors.initials: S
authors.lastname: Shi
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Duan
authors.forename: Jinling
authors.initials: J
authors.lastname: Shao
authors.forename: Qingbo
authors.initials: Q
authors.lastname: Duan
authors.forename: Shaobin
authors.initials: S
authors.lastname: Peng
mesh_terms: D000293:Adolescent; D000328:Adult; D002681:China / Q000453:epidemiology; D003719:Dens in Dente / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000266:history*; D049690:History, Ancient; D006801:Humans; D007180:Incisor / Q000002:abnormalities*; D008297:Male; D008875:Middle Aged; D014057:Tomography, X-Ray Computed; D014070:Tooth / Q000000981:diagnostic imaging*; D014092:Tooth Root / Q000000981:diagnostic imaging*; D055815:Young Adult
keywords: archaeology; classification; dens in dente; image reconstruction; lateral incisor; micro-computed tomography; prevalence; teeth abnormalities