Clinical evaluation of four dentin bonding agents in Class V abrasion lesions: a four-year follow-up.

OBJECTIVES

The purpose of this study was to clinically evaluate the long-term retention of four dentin bonding agents in Class V abrasion/erosion lesions during a four-year period.

METHODS

Two hundred twenty-three restorations were placed in 81 patients. Four bonding agents and composite resins (Mirage bond/Silux, Tenure/Opalux, Tripton/Opalux and Scotchbond 2/Silux) were placed according to the manufacturers' instructions. No additional undercuts or etching of adjacent enamel was done. The restorations were evaluated every six mon during a four-year period.

RESULTS

Two restorations developed secondary caries during the study. After six mon, three y, and four y, respectively, the loss rates for the dentin bonding agents were: Mirage bond, 38.6%/73.0%/74.6%; Tenure, 8.5%/51.2%/56.1%; Tripton, 30.2%/83.0%/83.0%; and Scotchbond 2, 9.6%/21.2%/23.1%. Scotchbond 2 showed significantly fewer failures than the other three bonding agents. No correlation was found between retention failure frequency and age of the patients. After two years, 88.0% of all the retention failures were registered.

SIGNIFICANCE

Despite the promise of dentin bonding agents to form a resin-reinforced layer in the dentin, a high clinical failure rate was registered for three of the four evaluated bonding agents in Class V restorations.