The ESEM observation on the bonding interfaces of human dentin and adhesive Single bond 2 with different painting patterns

AIM:To compare the morphology of dentin bonding interfaces with different brush ways of adhesive Single bond 2 to offer a reference to clinic application of the adhesive.METHODS:Flat dentin surfaces were created on fresh extracted human third molars.The surfaces were coateded with Single bond 2 in different painting ways,including painted forces,directions,layers and hardening ways.Then the bonding interfaces were observed using the environmental scanning electron microscope(ESEM).Based on the adhesive distribution and effect of dentin tubule occlusion,the painting patterns were evaluated.RESULTS:Gently painting was better than emphatically for adhesive distribution.Brush in the same direction was superior to do it back and forth.The interface coated with two layers of the adhesive was the best in comparing to one layer and four.Harden once was better than twice.CONCLUSION:It would be a recommended way to use Single bond 2,the 5th generation adhesive,to paint it two layers gently in the same direction onto the dentin surface and harden once after keeping still twice in clinic application for uniform adhesive distribution and effective occlusion to dentin tubule.