title: Influence of HClO4 strength and etching time on rate of etching and surface roughness of human enamel.
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000187:drug effects / Q000648:ultrastructure*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D010472:Perchlorates / Q000008:administration & dosage* / Q000494:pharmacology; D013997:Time Factors
chemical_list: D010472:Perchlorates