title: Clinical evaluation of four dentin bonding agents in Class V abrasion lesions: a four-year follow-up.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D017438:Bisphenol A-Glycidyl Methacrylate; D016009:Chi-Square Distribution; D003188:Composite Resins; D001840:Dental Bonding; D003793:Dental Restoration, Permanent / Q000379:methods*; D017220:Dentin-Bonding Agents; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008689:Methacrylates; D008875:Middle Aged; D011140:Polyurethanes; D019279:Resin Cements; D013997:Time Factors; D014072:Tooth Abrasion / Q000628:therapy*; D017211:Treatment Failure
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C070605:Mirage-Bond; D011140:Polyurethanes; D019279:Resin Cements; C069300:Tripton resin; C067788:scotchbond 2; C029824:urethane dimethacrylate luting resin; C074811:Tenure adhesive; D017438:Bisphenol A-Glycidyl Methacrylate