title: Quantitative contribution of resin infiltration/hybridization to dentin bonding.
abstract: This study determined, quantitatively, the role of resin infiltration in dentin bonding. Four groups contained 10 molar teeth. Thirty were sectioned in the mid-coronal region and the dentin ground flat with 600 grit silicon carbide paper. Group 1: smear layer intact; Group 2: smear layer removed with a Prophy Jet; Group 3: conditioned with 10% H3PO4 for 20 seconds; Group 4: comprised dentin exposed by a transverse, mid-coronal fracture. Dentin surfaces were treated with All-Bond 2, its companion bonding agent, followed by P50 resin composite, polymerized in 1 mm increments. After storage in water at 37 degrees C for 24 hours, the assemblies were tested to failure in a shear mode at a crosshead speed of 5 mm/minute. Surface and interfacial morphology was characterized using SEM. Values in MPa were: Group 1: 10.24 +/- 2.98; Group 2: 20.37 +/- 4.62; Group 3: 32.68 +/- 7.12; and Group 4: 26.77 +/- 4.85. ANOVA and student t-test showed the means statistically different (P < 0.05). Since resin penetration was only found appreciably in dentin tubules in Group 4 and tubular and intertubular penetration in Group 3, it was concluded that resin infiltration can contribute approximately one third of the shear bond strength of this total etch system.
authors.affiliation: Department of Oral Biology & Pathology, SUNY at Stony Brook, Stony Brook, NY 11794.
authors.forename: A J
authors.initials: AJ
authors.lastname: Gwinnett
mesh_terms: D000134:Acid Etching, Dental; D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D016369:Smear Layer; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: C074864:All-Bond system; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C065771:P50 composite resin; D017438:Bisphenol A-Glycidyl Methacrylate