title: The effect of etching on glass polyalkenoate cements.
abstract: The effect of acid etching on the surface appearance and flexural strength of four glass polyalkenoate cements was investigated. Specimens were etched for intervals of 10-60 s, both at the recommended time after mixing and after a 24-h delay. The surface texture was examined microscopically. Further specimens were subjected to a 4-point bend test following etching 1 h and 24 h after mixing. Deterioration of the surface appearance occurred as the etching time was increased beyond 10 s following immediate etching. Etching after 24 h reduced surface damage, but a 10-s etch still gave the most favourable surface appearance without loss of particulate material. Etching beyond 10 s significantly reduces flexural strength.
authors.affiliation: Department of Experimental Dentistry, University College London Dental School, U.K.
authors.forename: S E
authors.initials: SE
authors.lastname: Taggart
authors.forename: G J
authors.initials: GJ
authors.lastname: Pearson
mesh_terms: D000134:Acid Etching, Dental; D000538:Aluminum Silicates / Q000737:chemistry; D016722:Cermet Cements; D003722:Dental Alloys / Q000737:chemistry; D003775:Dental Polishing; D004548:Elasticity; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008298:Maleates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D012834:Silver / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D000538:Aluminum Silicates; D016722:Cermet Cements; D003722:Dental Alloys; D005899:Glass Ionomer Cements; D008298:Maleates; D012834:Silver; C039733:Chemfil; C040964:Ketac-Fil