title: Microhardness of sound, decalcified and etched tooth enamel related to the calcium content.
mesh_terms: D000818:Animals; D002118:Calcium / Q000032:analysis*; D003648:Decalcification Technique; D003743:Dental Enamel / Q000033:anatomy & histology*; D006244:Hardness; D006801:Humans; D008854:Microscopy, Electron; D013057:Spectrum Analysis
chemical_list: D002118:Calcium