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Quantitative contribution of resin infiltration/hybridization to dentin bonding.
American Journal of Dentistry 1993 Februrary
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.
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