title: Effect of self-etching primer/adhesive and conventional bonding on the shear bond strength in metallic and ceramic brackets.
abstract: BACKGROUND
  Bracket debonding from the tooth surface is a common problem in fixed orthodontics. The aims of the present study were to assess the bond strength and failure sites in two ways of bonding technique, with metallic and ceramic brackets.
  
  
  METHODS
  One hundred premolars were assigned to 4 groups of 25 each: Group A, metallic brackets/conventional procedure; Group B, metallic brackets/Transbond XT; Group C, ceramic brackets/conventional procedure; and Group D, ceramic brackets/Transbond XT. Transbond XT composite paste was used for bracket bonding and cured by conventional light-cure device. Specimens were subjected to thermocycling. One week after bonding shearing force was applied to the bracket-tooth interface. Bonding failure site optically examined using a stereomicroscope under 10 × magnifications and scoring was done using the adhesive remnant index (ARI). Data were subjected to analysis of One-way variance, Tukey post hoc, Chi-square and Spearman's tests.
  
  
  RESULTS
  Mean bond strength (in MPa) were: group A=9.2, group B=8.5, group C=6.2 and group D=5.7. Bond strength differences between groups A and B, and between C and D were not significant, (p<0.0005). Insignificant difference found in ARI in all groups.
  
  
  CONCLUSIONS
  The bond strengths of metallic brackets were significantly higher than ceramic ones and the self-etching primer produce fewer bonds than the conventional method (clinically acceptable).A positive correlation found between changes in shearing bond strength and ARI.
authors: Orthodontic Department, TMSU, Tabriz, Iran. mirzakouchaki@gmail.com
authors: Behnam
authors: B
authors: Mirzakouchaki
authors: Soodabeh
authors: S
authors: Kimyai
authors: Mahboubeh
authors: M
authors: Hydari
authors: Shirin
authors: S
authors: Shahrbaf
authors: Parvin
authors: P
authors: Mirzakouchaki-Boroujeni
mesh_terms: D000269:Adhesives; D000293:Adolescent; D000328:Adult; D001840:Dental Bonding; D045662:Dental Etching; D006801:Humans; D066298:In Vitro Techniques; D008422:Materials Testing; D016910:Orthodontic Brackets; D019279:Resin Cements; D033081:Shear Strength; D013193:Stainless Steel; D055815:Young Adult
chemical_list: D000269:Adhesives; D019279:Resin Cements; C477790:Transbond XT; D013193:Stainless Steel