title: Reconditioning of self-ligating brackets.
abstract: OBJECTIVE
  To test the null hypothesis that there is no significant difference in the shear bond strength (SBS) and Adhesive Remnant Index (ARI) scores of new vs reconditioned self-ligating brackets.
  
  
  METHODS
  One hundred and twenty permanent extracted bovine teeth were embedded in resin blocks. Three different new and reconditioned self-ligating orthodontic brackets (Smart Clip [3M Unitek]; Quick [Forestadent]; and Damon3MX [Ormco]) were tested. Scanning electron microphotographs of the different new (groups 1, 3, and 5) and reconditioned (groups 2, 4, and 6) bracket bases were taken before starting the experiments. Brackets were then bonded to the teeth using an orthodontic adhesive and were then tested in shear mode using an Instron Universal Testing Machine. ARI scores were then recorded. Statistical analysis was performed to determine significant differences in SBS and ARI Scores.
  
  
  RESULTS
  Smart Clip and Damon3MX reconditioned brackets showed significantly lower SBS than did new ones. On the contrary, Quick reconditioned brackets showed significantly higher SBS than did new ones. No significant differences in ARI scores were found after the reconditioning process for the three different brackets tested.
  
  
  CONCLUSIONS
  The in-office reconditioning procedure alters the SBS of self-ligating brackets, although SBS values still remain clinically acceptable.
authors.affiliation: Department of Orthodontics, University of Pavia, Pavia, Italy.
authors.forename: Maria Francesca
authors.initials: MF
authors.lastname: Sfondrini
authors.forename: Esmeralda
authors.initials: E
authors.lastname: Xheka
authors.forename: Andrea
authors.initials: A
authors.lastname: Scribante
authors.forename: Paola
authors.initials: P
authors.lastname: Gandini
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Sfondrini
mesh_terms: D000818:Animals; D002417:Cattle; D001840:Dental Bonding; D017005:Dental Debonding; D003743:Dental Enamel; D003799:Dental Stress Analysis; D017743:Equipment Reuse; D008422:Materials Testing; D016910:Orthodontic Brackets; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties