title: Thickness of enamel layers removed by HClO4 etching.
mesh_terms: D000134:Acid Etching, Dental; D002118:Calcium / Q000032:analysis; D001840:Dental Bonding; D003743:Dental Enamel / Q000032:analysis / Q000033:anatomy & histology*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D010472:Perchlorates / Q000008:administration & dosage*; D013054:Spectrophotometry, Atomic; D013997:Time Factors
chemical_list: D010472:Perchlorates; D002118:Calcium