title: The effect of surface treatments and bonding regimens on microtensile bond strengths of repaired composite: An in vitro study.
abstract: OBJECTIVE
  To assess the microtensile bond strength of repaired composite resin that was surface treated by diamond point or silicon carbide followed by bonding using either only total- etch bonding regimen or silane coupling agent with adhesive resin.
  
  
  METHODS
  Fourteen composite blocks were aged under deionized water for 14 days. The bonding surface was prepared with coarse diamond point or silicon carbide. Two blocks with no surface treatment were used as control groups. The bonding regimen was either total-etch bonding regimen or silane coupling agent and bonding agent. The aged samples were then bonded to new composite. Five sections per block (each 1mm thick) were prepared; cut to obtain an adhesive zone of approximately 1mm(2) and subjected to microtensile bond strength testing.
  
  
  RESULTS
  The highest bond strength was obtained by surface treatment by coarse diamond point and total etch bonding regimen and least by silicon carbide and silane. A statistically significant difference was seen in all the four groups.
  
  
  CONCLUSIONS
  Surface treatment by a coarse diamond point and total-etch bonding regimen provides highest bond strength. Thus, a simpler treatment regimen can contribute to a better bond strength in repaired composites.
authors.affiliation: Department of Conservative Dentistry and Endodontics, JSS Dental College, Mysore, India.
authors.forename: Gouri Smita
authors.initials: GS
authors.lastname: Acharya
authors.forename: Mk
authors.initials: M
authors.lastname: Manjunath
keywords: Microtensile bond strength; repaired composite resin; silane primer; total-etch bonding agent