title: Shear bond strength of an orthodontic self-etching adhesive after intracoronary bleaching.
abstract: OBJECTIVE
  To evaluate the effects of intracoronary bleaching on the bond strength of orthodontic brackets using self-etching and total-etch adhesive systems.
  
  
  METHODS
  In 60 bovine incisors, a coronal lingual access was made to clean the pulp chamber and standardise the thickness of the dentine. The sample was randomly divided into four groups (each n = 15): (CT), control group, without bleaching and bonded with the total-etch system (Transbond(™) XT-3M); (CTSE), without bleaching treatment and bonded with the self-etching system (Transbond(™) Plus Self-Etching Primer-3M); (BT), treated with 35% hydrogen peroxide for internal bleaching and bonded with the total-etch adhesive system; and (BTSE), treated with 35% hydrogen peroxide and bonded with the self-etching adhesive system. Shear bond strength was measured using a universal testing machine (EMIC). The adhesive remnant index (ARI) score was verified. The data were analysed using a two-way anova and Tukey test (p < 0.05).
  
  
  RESULTS
  Significant differences were found, and the self-etching adhesive groups presented the highest bond strength values (CTSE=11.55 ± 2.85 MPa; BTSE=14.14 ± 2.23 MPa). The ARI scores revealed significant differences among the groups; the greater amount of remaining adhesive was observed in the CTSE group, and the lowest scores were observed in the BT group.
  
  
  CONCLUSIONS
  The use of the self-etching adhesive system, even after intracoronal bleaching, presented satisfactory adhesive strength for the bonding of brackets.
authors.affiliation: Department of Dentistry, Ceuma University, São Luís, MA, Brazil.
authors.forename: H O
authors.initials: HO
authors.lastname: Fernandes
authors.forename: L B
authors.initials: LB
authors.lastname: Santos
authors.forename: L M
authors.initials: LM
authors.lastname: Firoozmand
mesh_terms: D000268:Adhesiveness; D000818:Animals; D002417:Cattle; D055117:Curing Lights, Dental / Q000145:classification; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000187:drug effects; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure*; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000494:pharmacology; D008422:Materials Testing; D016910:Orthodontic Brackets; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry*; D018915:Root Canal Preparation / Q000379:methods; D012464:Saliva, Artificial / Q000737:chemistry; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D014073:Tooth Bleaching / Q000379:methods*; D058205:Tooth Bleaching Agents / Q000737:chemistry / Q000494:pharmacology
chemical_list: D019279:Resin Cements; D012464:Saliva, Artificial; D058205:Tooth Bleaching Agents; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT; D006861:Hydrogen Peroxide
keywords: dental bonding; orthodontic brackets; shear strength; teeth bleaching