title: Eighteen-month clinical evaluation of a filled and unfilled dentin adhesive.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the performance of a filled (OptiBond Solo) and an unfilled (Prime & Bond 2.1) "one-bottle" adhesive in Class V restorations after 18 months of clinical service.
  
  
  METHODS
  Thirty-three patients with non-carious cervical lesions were enrolled in the study. A total of 101 lesions were restored using one of the adhesives and a hybrid composite resin. Enamel was not beveled, nor was any mechanical retention placed. The restorations were evaluated at baseline, and at 6 and 18 months after placement using modified USPHS criteria.
  
  
  RESULTS
  Cumulative 18-month retention rates were 93.6% for OptiBond Solo and 98.0% for Prime & Bond 2.1. The difference in retention rates was not statistically significant. For OptiBond Solo, the only notable problems were interfacial staining and marginal adaptation, both of which were less than ideal in 9% of restorations. Marginal problems were slightly less frequent for Prime & Bond 2.1 restorations, but the difference was not significant.
  
  
  CONCLUSIONS
  Both adhesives provided Class V retention rates exceeding the 18-month, full acceptance guidelines set by the American Dental Association. Any additional benefit provided by the use of a filled adhesive was not detected in this 18-month clinical trial.
authors.affiliation: Department of Operative Dentistry, School of Dentistry, University of North Carolina, CB#7450, 302 Brauer Hall, 27599-7450, Chapel Hill, NC, USA. ed_swift@dentistry.unc.edu
authors.forename: E J
authors.initials: EJ
authors.lastname: Swift
authors.forename: J
authors.initials: J
authors.lastname: Perdigão
authors.forename: H O
authors.initials: HO
authors.lastname: Heymann
authors.forename: A D
authors.initials: AD
authors.lastname: Wilder
authors.forename: S C
authors.initials: SC
authors.lastname: Bayne
authors.forename: K N
authors.initials: KN
authors.lastname: May
authors.forename: J R
authors.initials: JR
authors.lastname: Sturdevant
authors.forename: T M
authors.initials: TM
authors.lastname: Roberson
mesh_terms: D000269:Adhesives; D000328:Adult; D000368:Aged; D003188:Composite Resins; D001840:Dental Bonding; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D017220:Dentin-Bonding Agents; D006801:Humans; D008875:Middle Aged; D019279:Resin Cements; D014072:Tooth Abrasion / Q000628:therapy*; D019237:Tooth Cervix; D014075:Tooth Discoloration / Q000209:etiology; D014077:Tooth Erosion / Q000628:therapy*
chemical_list: D000269:Adhesives; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C092987:Optibond; C099128:Prodigy; D019279:Resin Cements