title: Infrared determination of the degree of substitution of hydroxyl by carbonate ions in human dental enamel.
abstract: About 11 +/- 1% of the carbonate ions in a human tooth enamel specimen (dense fraction, sp. g. greater than 2.95) were found to be in the A-sites, replacing hydroxyl ions. The determination was made with a difference infrared spectrometry technique utilizing both tooth enamel and a reconstituted biological apatite with a known amount of replacement of hydroxyl by carbonate ions.
mesh_terms: D002130:Calcium Phosphates / Q000032:analysis; D002254:Carbonates / Q000032:analysis*; D003743:Dental Enamel / Q000032:analysis*; D006801:Humans; D006878:Hydroxides / Q000032:analysis*; D006900:Hydroxylation; D013055:Spectrophotometry, Infrared / Q000379:methods; D014961:X-Ray Diffraction
chemical_list: D002130:Calcium Phosphates; D002254:Carbonates; D006878:Hydroxides