title: Effects of sandblasting and silica coating on the bond strength of rebonded mechanically retentive ceramic brackets.
abstract: BACKGROUND
  The aim of this study was to determine the bond strength of rebonded mechanically retentive ceramic brackets after treatment with 2 abrasive techniques.
  
  
  METHODS
  In addition to a group of new brackets, 3 groups were treated according to the following conditions of debonded ceramic bracket bases: sandblasting, sandblasting + silane, and silica coating + silane (15 in each group). Treated ceramic brackets were rebonded on premolars. The samples were stored in distilled deionized water for 24 hours at 37 degrees C in an incubator and then thermocycled for 1000 times between 5 degrees C and 55 degrees C. Shear force was applied to the enamel-adhesive interface until debonding.
  
  
  RESULTS
  The highest bond strength values were in the silica coating + silane and the new bracket groups (12.7 and 12.0 MPa, respectively), followed by the sandblasting + silane group (10.5 MPa). The sandblasting group had a significantly lower bond strength value (4.5 MPa). No enamel fracture was noted in any sample tested. In the new bracket and the sandblasting + silane groups, 20% of the samples had adhesive remnant index scores of 2, and 80% had scores of 3. In the sandblasting group, all specimens debonded at the bracket-adhesive interface. The silica coating + silane group showed mixed failures.
  
  
  CONCLUSIONS
  Sandblasting + silane and silica coating + silane applications on debonded ceramic bracket base can produce bond strengths comparable with new brackets.
authors.affiliation: Department of Orthodontics, Cukurova University, Balcali, 01330, Adana, Turkey. storoglu@cu.edu.tr
authors.forename: M Serdar
authors.initials: MS
authors.lastname: Toroglu
authors.forename: Sirin
authors.initials: S
authors.lastname: Yaylali
mesh_terms: D020906:Air Abrasion, Dental; D000704:Analysis of Variance; D001641:Bicuspid; D002516:Ceramics; D001840:Dental Bonding; D017005:Dental Debonding; D003799:Dental Stress Analysis; D017743:Equipment Reuse / Q000191:economics; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D016910:Orthodontic Brackets; D033081:Shear Strength; D012821:Silanes; D013314:Stress, Mechanical; D013499:Surface Properties; D016019:Survival Analysis
chemical_list: D012821:Silanes