Measurement Of The Enamel Thickness In People Living 3000 Years Ago By Using Micro-CT

Molar enamel thickness has played an important role in the taxonomic, phylogenetic, and dietary assessments of fossil primate teeth for nearly 90 years. Paleoanthropologists employ enamel thickness in paleodietary and taxonomic studies regarding earlier hominins, but variation in enamel thickness within the genus Homo has not been thoroughly explored .Despite the frequency with which enamel thickness is discussed in paleoanthropological discourse, methods used to attain information about enamel thickness are destructive and record information from only a single plane of section. Such semidestructive planarmethods limit sample sizes and ignore dimensional data that may be culled from the entire length of a tooth. In light of recently developed techniques to investigate enamel thickness in 3D without destroying samples.In the study, we measured the enamel thickness in maxillary second premolars of people living 3000 years ago by using Micro-CT.We fund Enamel thickness in maxillary second premolars of people about 3000 years ago from Shaanxi showed: the lingual cusp enamel is the thickest of all region, the distal enamel is obviously thicker than the buccal (P<0.05). We think 3000 years ago, the enamel thicknesses were quite distinct in different cross sections of maxillary second premolars.In the second part of our study ,we measured the enamel thickness in maxillary third molar of people living 3000 years ago by using Micro-CT. We fund enamel thickness in maxillary third molar of people about 3000 years ago from Shaanxi showed: enamel-dentine junction area is 178.70mm2; average enamel thickness is 1.29mm, relative enamel thickness is 20.7. We think average enamel thickness and relative enamel thickness have connection with race ,period and region.