title: Influence of dentin conditioning on bond strength of light-cured ionomer restorative materials and polyacid-modified composite resins.
abstract: The purpose of the study was to evaluate the dentin bond strength of restorative materials containing both glass ionomer and composite resin components. Three resin-modified glass ionomer restorative materials (Fuji II LC, Photac-Fil, Vitremer), three polyacid-modified composite resins (Dyract, Ionosit Fil, VariGlass VLC), a hybrid composite (blend-a-lux) and a chemical-cured glass ionomer cement (ChemFil Superior) were investigated for dentin tensile bond strength with and without conditioning of the tooth surfaces. For each material, tensile bond strength was determined using five conditioned and five unconditioned bovine tooth specimens. Conditioning of the specimens was performed according to the manufacturers' instructions. The tensile bond strength was tested with a universal testing machine. Statistical analysis was performed with analysis of variance, the Scheffe's-test and the Student's t-test. All materials showed higher adhesion to conditioned dentin than to unconditioned specimens. Except for Photac-Fil, the bond strength to conditioned dentin of all resin-modified glass ionomer restorative materials and polyacid-modified composite resins was higher as compared to the chemical-cured glass ionomer and the hybrid composite. However, these differences were not statistically significant. All polyacid-modified composite resins resulted in higher bond strengths to conditioned dentin as compared to the resin-modified glass ionomer restorative materials. These differences were statistically significant only for VariGlass VLC as compared to Photac-Fil. In order to improve adhesion of the tested materials to dentin it is highly recommended to follow the manufacturers' instructions concerning dentin conditioning.
authors.affiliation: Department of Operative Dentistry, University Clinic of Dentistry (Zahnklinik), Freiburg, Germany.
authors.forename: W
authors.initials: W
authors.lastname: Buchalla
authors.forename: T
authors.initials: T
authors.lastname: Attin
authors.forename: E
authors.initials: E
authors.lastname: Hellwig
mesh_terms: D000180:Acrylic Resins; D000538:Aluminum Silicates; D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D020770:Compomers; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D005069:Evaluation Studies as Topic; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008422:Materials Testing; D008689:Methacrylates; D010865:Pilot Projects; D019279:Resin Cements; D012117:Resins, Synthetic; D017640:Silicates; D013718:Tensile Strength
chemical_list: D000180:Acrylic Resins; D000538:Aluminum Silicates; D020770:Compomers; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C088486:Dyract; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; C091836:Ionosit; D008689:Methacrylates; C081144:Photac-Fil; D019279:Resin Cements; D012117:Resins, Synthetic; D017640:Silicates; C081982:VariGlass VLC; C084550:Vitremer; C098567:blend-a-lux; C039733:Chemfil