The effect of acid etching solution on the Vickers hardness number of enamel.
D000134:Acid Etching, Dental / Q000009:adverse effects; D001840:Dental Bonding / Q000009:adverse effects; D003743:Dental Enamel / Q000187:drug effects*; D006244:Hardness; D006801:Humans; D066298:In Vitro Techniques; D008437:Maxilla; D008963:Molar