title: Repair of glass ionomer restorative materials: flexure strength of specimens repaired by two methods.
abstract: This study evaluated the adhesion of newly mixed glass ionomer restorative materials to set materials. The flexure strength of specimens formed by the addition of new material to week-old material by using two different surface treatments was compared with the flexure strength of solid specimens that were 1 week old. All repaired specimens attained at least 44% of the average strength of unrepaired specimens of the same material. Repairs made with a combination of unlike materials were not significantly different from most repairs with like materials. For all materials collectively, repairs made with a 37% phosphoric acid pretreatment were significantly stronger than repairs made with a 40% polyacrylic acid pretreatment.
authors.affiliation: Ohio State University, College of Dentistry, Columbus.
authors.forename: W W
authors.initials: WW
authors.lastname: Brackett
authors.forename: W M
authors.initials: WM
authors.lastname: Johnston
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D001840:Dental Bonding; D003738:Dental Cements; D004548:Elasticity; D005899:Glass Ionomer Cements; D008298:Maleates; D008422:Materials Testing; D010756:Phosphoric Acids; D012823:Silicate Cement; D013314:Stress, Mechanical; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003738:Dental Cements; D005899:Glass Ionomer Cements; D008298:Maleates; D010756:Phosphoric Acids; C054101:ChemFil II; D012823:Silicate Cement; C006903:carbopol 940; C037885:Fuji-ionomer; C040964:Ketac-Fil