title: Mineral content of the innermost enamel in erupted human teeth.
abstract: It has been said that the innermost enamel of erupted human teeth is either a hyper- or a hypomineralized layer. Using SEM-EDX, in the present study, the Ca and P mineral contents of the innermost 10-15 microns enamel showing a highly negative birefringence (IE-I) were analyzed and compared with those of the adjacent inner enamel (IE-II) in each cuspal-third, mid-coronal, and cervical-third region. The Ca content in the IE-I zone was significantly lower than that in the IE-II zone in the mid-coronal and cervical-third regions, whereas the significant difference of P content was seen only in the cervical-third region. In the other areas, the IE-I zone tended to be lower than the IE-II zone. These significant and no significant differences of Ca and P contents may be due to the difference in the amount of organic substance in the IE-II zone of the three regions, and that of these mineralization rates after eruption of a tooth.
authors.affiliation: Department of Oral Anatomy, School of Dentistry, Showa University, Tokyo, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kodaka
authors.forename: K
authors.initials: K
authors.lastname: Debari
authors.forename: M
authors.initials: M
authors.lastname: Kuroiwa
mesh_terms: D000293:Adolescent; D001641:Bicuspid / Q000737:chemistry / Q000648:ultrastructure; D002118:Calcium / Q000032:analysis*; D002648:Child; D003743:Dental Enamel / Q000737:chemistry / Q000648:ultrastructure*; D003804:Dentin / Q000737:chemistry / Q000648:ultrastructure; D006801:Humans; D008855:Microscopy, Electron, Scanning; D010758:Phosphorus / Q000032:analysis*; D014078:Tooth Eruption
chemical_list: D010758:Phosphorus; D002118:Calcium