Effects of surface treatments on the retention of restorative materials to dentin

The effect of various pretreatments on shear bond strengths between dentin and three restorative materials was investigated. Pretreatments included use of cleansing agents and adhesion promoters in combination. Results indicated that: (1) phosphoric acid (50%) and EDTA (10%) were not effective in improving bonding between restorative materials and dentin; (2) NPG-GMA significantly increased resin-dentin adhesion with Cervident and Simulate resin. Silane adhesion promoter in combination with Fuji provided the greatest resistance to shear forces; and (3) Fuji Type II restorative material demonstrated more resistance to shear forces than Cervident and Simulate resins.