title: Shear bond strength of self-etching bonding systems in combination with various composites used for repairing aged composites.
abstract: OBJECTIVE
  Repair of worn, broken or discolored composite restorations can be accomplished using new composite material and dentin bonding systems. The purpose of this study was to investigate the effectiveness of self-etching adhesive systems for composite re-bonding procedures onto different composite substrates that had been aged for 6 years prior to testing.
  
  
  METHODS
  Two hundred cylinders (4 mm x 5 mm) of composite were fabricated using 4 hybrid composites [AeliteFil (Bisco), Prodigy (SDS Kerr), TPH (Dentsply Caulk), and Z100 (3M ESPE)] following manufacturers' directions and stored for 6 years in 1% NaCl solution. After aging, each specimen was wet polished through 600-grit SiC and randomly assigned to a self-etching bonding system (Adper Prompt L-Pop/Z100 [3M ESPE]; Tyrian One-Step Plus/AeliteFil [Bisco]; OptiBond Solo Plus SE/Prodigy [SDS Kerr], Xeno III/TPH [Dentsply Caulk]) or a total-etch control (Prime&Bond NT/TPH [Dentsply Caulk]) (n = 10 per group). Shear bond strengths (SBS) for repairs were evaluated after 48 h (crosshead speed = 0.5 mm/min) and were compared by two-way ANOVA (p = 0.05) with Tukey post-hoc tests.
  
  
  RESULTS
  Significant differences (p < or = 0.05) were detected for the main effects (substrates and bonding systems), but the interaction was not significant. SBS for bonding systems were from highest to lowest: (1) Prime&Bond NT, (2) OptiBond Solo Plus SE, (3) Adper Prompt L-Pop, (4) Xeno III, (5) Tyrian One-Step Plus. SBS of the repair systems to Z100 were significantly lower than those to the other composite substrates.
  
  
  CONCLUSIONS
  Self-etching systems can be used to repair aged composite, but the efficacy of repair of aged composite is system dependent.
authors.affiliation: Department of Operative Dentistry, School of Dentistry, CB#7450, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7450, USA. teixeire@dentistry.unc.edu
authors.forename: Erica C
authors.initials: EC
authors.lastname: Teixeira
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Bayne
authors.forename: Jeffrey Y
authors.initials: JY
authors.lastname: Thompson
authors.forename: Andre V
authors.initials: AV
authors.lastname: Ritter
authors.forename: Edward J
authors.initials: EJ
authors.lastname: Swift
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods; D017269:Dental Prosthesis Repair; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000145:classification; D006801:Humans; D008422:Materials Testing; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012965:Sodium Chloride; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry
chemical_list: C098721:Aelitefil; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C451600:OptiBond Solo Plus; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C099128:Prodigy; C408584:Prompt L-Pop; D019279:Resin Cements; D012821:Silanes; C113300:TPH hybrid; C481138:Tyrian SPE; C487957:Xeno III; C083568:Z100 composite resin; D012965:Sodium Chloride; D017438:Bisphenol A-Glycidyl Methacrylate; D012822:Silicon Dioxide; D015040:Zirconium