EVALUATION OF 2 DENTIN ADHESIVES IN CERVICAL LESIONS

The clinical effectiveness of two dentin adhesives, Clearfil New Bond and Scotchbond 2, was evaluated in two different cavity designs. Group A was without enamel bevel or acid etch and with a butt-joint cavity; and group B had enamel bevel, acid etch, and feather-edged cavities. The retentive rate and marginal adaptation were monitored for 2 years. In the Clearfil system, 21% of group A restorations failed after 2 ye ars, whereas virtually all the group B restorations (99%) were retaine d. In addition, after 2 years, the total of debonded group A restorati ons in the Scotchbond 2 system expanded to 13%, whereas no restoration s from group B were lost. There was clearly marginal deterioration in time irrespective of the bonding system. Nevertheless, the marginal ad aptation of cervical lesions restored with Clearfil New Bond adhesive in combination with Clearfil Ray composite resin revealed fewer defect s compared with the Scotchbond 2 adhesive with Silux Plus composite re sin restorations. SEM evaluation disclosed composite resin remnants on the dentin surface in cavities with lost fillings, which indicates pa rtial cohesive failure of the adhesive joint.