title: Laboratory study of the Herculite XR system.
abstract: The shear bond strengths of the Herculite XR system to dentin were determined the quantitative microleakage of Class V restorations in dentin evaluated; the fluoride release from the XR-Ionomer determined, and fractured test specimens depicting various failure patterns examined in the scanning electron microscope. The shear bond strength of the XR-Ionomer to dentin was 6.6 +/- 1.7 MPa and the Herculite XR 15.4 +/- 3.7 MPa. Sixteen of the 20 Herculite XR test specimens fractured in dentin. The quantitative microleakage of Class V Herculite XR restorations in dentin was 2.22 +/- 1.94 micrograms dye which was significantly reduced to 0.91 +/- 0.63 micrograms when the XR-Ionomer was placed in the floors of the preparations. The fluoride release from the XR-Ionomer dropped sharply during the first 6 days after which it reached a plateau at approximately 0.5 microgramsF.mm-2.
authors.affiliation: University of Alabama School of Dentistry, Birmingham.
authors.forename: F M
authors.initials: FM
authors.lastname: Kamel
authors.forename: D H
authors.initials: DH
authors.lastname: Retief
authors.forename: R S
authors.initials: RS
authors.lastname: Mandras
authors.forename: C M
authors.initials: CM
authors.lastname: Russell
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D003763:Dental Leakage; D003804:Dentin; D005459:Fluorides; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008963:Molar; D019279:Resin Cements; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D019279:Resin Cements; C065770:Herculite XR; D005459:Fluorides