title: Diametral tensile strength and bonding to dentin of type I glass ionomer cements.
abstract: This study evaluated the diametral tensile strength of type I glass ionomer cements and measured their tensile and shear bond strengths to dentin with and without conditioning. Four brands of glass ionomer cement and one brand of zinc phosphate cement were tested. Disks of each cement type were prepared and the 7-day diametral compression test for tension was conducted. The shear and tensile tests, with and without 10% polyacrylic acid dentin conditioning, were performed with an Instron testing machine. Two additional groups, one for each bond test, were prepared and conditioned with 90% trichloracetic acid. No significant differences of the diametral strength were found among the various glass ionomer cements. The comparison of means suggests that, except for trichloracetic acid dentin pretreatment, the conditioning is an effective promoter of shear strength and has no significant effect (p < 0.01) on the tensile bond strength. However, trichloracetic acid was found to be a most effective dentin conditioner for both shear and tensile bond strengths (p < 0.01).
authors.affiliation: Laboratory for Biomaterials, Hebrew University-Hadassah School of Dental Medicine, Jerusalem, Israel.
authors.forename: E A
authors.initials: EA
authors.lastname: Galun
authors.forename: N
authors.initials: N
authors.lastname: Saleh
authors.forename: I
authors.initials: I
authors.lastname: Lewinstein
mesh_terms: D000134:Acid Etching, Dental; D000180:Acrylic Resins / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis; D003804:Dentin / Q000648:ultrastructure*; D005069:Evaluation Studies as Topic; D005899:Glass Ionomer Cements / Q000737:chemistry* / Q000145:classification; D006801:Humans; D008277:Magnesium Oxide / Q000737:chemistry; D008422:Materials Testing; D011076:Polycarboxylate Cement / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength; D014238:Trichloroacetic Acid / Q000737:chemistry; D015034:Zinc Oxide / Q000737:chemistry; D015036:Zinc Phosphate Cement / Q000737:chemistry
chemical_list: D000180:Acrylic Resins; D005899:Glass Ionomer Cements; D011076:Polycarboxylate Cement; C062270:Shofu Hybond; C045751:Aqua-cem; D008277:Magnesium Oxide; C006903:carbopol 940; D014238:Trichloroacetic Acid; C037885:Fuji-ionomer; D015036:Zinc Phosphate Cement; C040235:Ketac-cem; D015034:Zinc Oxide