title: Initial tensile bond strength of resin-modified glass ionomers and polyacid-modified resins on perfused primary dentin.
abstract: The objective of this study was to evaluate the initial tensile bond strength of a resin-modified glass ionomer (Photac-Fil) and two polyacid-modified composite resins (Compoglass, Dyract) to primary dentin. A hybrid composite resin (Tetric) and two chemical cured glass ionomers (BaseLine, Hi-Dense) served as controls. Ninety caries-free dentinal discs were ground flat and perfused with Ringer's solution. Dentinal surfaces were conditioned (except for Base Line). From each material, fifteen standardized specimens were attached to the dentin. Light-curing of the respective materials followed (1 min), and adhesion was tested with a universal testing machine 15 min after application. The highest initial bond strength was observed with Tetric (5.17 MPa). Closed test procedure (Kruskal-Wallis) showed significant differences between all materials (P < 0.05), except for Compoglass (1.82 MPa) vs. Dyract (2.35 MPa), and BaseLine (0.37 MPa) vs. Photac-Fil (0.42 MPa). The condensable glass ionomer Hi-Dense revealed a mean tensile bond strength of 0.79 MPa. Adhesion of (polyacid-modified) composite resins is superior to the other tested glass ionomer materials, when applied to perfused primary dentin.
authors.affiliation: University Clinic of Dentistry, Department of Operative Dentistry, Freiburg, Germany.
authors.forename: A M
authors.initials: AM
authors.lastname: Kielbassa
authors.forename: K T
authors.initials: KT
authors.lastname: Wrbas
authors.forename: E
authors.initials: E
authors.lastname: Hellwig
mesh_terms: D002648:Child; D002675:Child, Preschool; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000706:statistics & numerical data; D003804:Dentin / Q000187:drug effects*; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing / Q000379:methods / Q000706:statistics & numerical data; D008963:Molar; D011897:Random Allocation; D013718:Tensile Strength; D014094:Tooth, Deciduous
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements