title: Six-month bracket survival with a self-etch adhesive.
abstract: OBJECTIVE
  To evaluate, over a 6-month period, the clinical performance of a self-etch adhesive (Transbond Plus Self-Etching) compared with a conventional adhesive that uses the etch and rinse approach (Transbond XT).
  
  
  METHODS
  One operator, using the straight-wire technique, placed 567 metallic brackets in 30 patients (age range 12-18 years) such that homologous teeth from the same arch received different materials. The brackets were bonded following the manufacturer's instruction except for the fact that the self-etch system was brushed for a longer time than recommended (10-15 seconds). The failure modes were visually classified into three modes: adhesive-enamel, adhesive-bracket, and cohesive failure. The survival rate of the brackets was estimated by Kaplan-Meier and log-rank test (P < .05).
  
  
  RESULTS
  The failure rates of the conventional and self-etch [corrected] adhesives were 10.6% and 7.4%, respectively. The failure rate of the conventional system was 0.43 [corrected] times greater than that of the self-etch system. The self-etch adhesive showed a higher survival rate compared with the conventional system (P < .05). Most of the failures were cohesive and at the adhesive-enamel surface. No difference in the fracture debonding mode was observed for the materials.
  
  
  CONCLUSIONS
  These findings indicate that the self-etch Transbond Plus Self-Etching can be safely used for orthodontic brackets because it provides higher survival rates than does the conventional Transbond XT.
authors.affiliation: Department of Orthodontics, University of Oeste de Santa Catarina, Brazil.
authors.forename: José Elui
authors.initials: JE
authors.lastname: dos Santos
authors.forename: Jonas
authors.initials: J
authors.lastname: Quioca
authors.forename: Alessandro Dourado
authors.initials: AD
authors.lastname: Loguercio
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
mesh_terms: D000134:Acid Etching, Dental; D000268:Adhesiveness; D000293:Adolescent; D002648:Child; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D004868:Equipment Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D019279:Resin Cements / Q000737:chemistry*; D013499:Surface Properties; D016019:Survival Analysis
chemical_list: D019279:Resin Cements; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT