title: Influence of different methods of cleaning custom bases on the shear bond strength of indirectly bonded brackets.
abstract: OBJECTIVE
  To determine the influence on shear bond strength and bond failure location of four cleaning methods for orthodontic bracket custom bases.
  
  
  METHODS
  In vitro laboratory study.
  
  
  METHODS
  Eighty bovine teeth were divided at random into four groups. The bracket custom bases were cleaned with different methods: group 1 with methyl methacrylate monomer, group 2 with acetone, group 3 with 50 μm aluminium oxide particles and group 4 with detergent. The brackets were indirectly bonded onto the teeth with the Sondhi Rapid-Set self-curing adhesive. The maximum required shear bond strength to debond the brackets was recorded. The bond failure location was evaluated using the Adhesive Remnant Index (ARI). One-way analysis of variance (ANOVA) analysis (P<0·05) was used to detect significant differences in the bond strength. Kaplan-Meier survival plots and log-rank test were done to compare the survival distribution between the groups. The Kruskal-Wallis test (P<0·05) was used to evaluate the differences in the ARI scores.
  
  
  RESULTS
  The mean bond strengths in groups 1, 2, 3 and 4 were 23·7±5·0, 25·3±5·1, 25·6±3·7 and 25·7±4·2 MPa, respectively. There were no significant statistically differences in either the bond strength or the ARI score between the groups.
  
  
  CONCLUSIONS
  The four custom base-cleaning methods presented the same efficiencies on indirect bond of the brackets; thus, practitioners can choose the method that works best for them.
authors: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: Lylian K
authors: LK
authors: Kanashiro
authors: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: Julissa J
authors: JJ
authors: Robles-Ruíz
authors: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: Ana L
authors: AL
authors: Ciamponi
authors: Department of Biomaterials and Oral Biology, School of Dentistry, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: Igor S
authors: IS
authors: Medeiros
authors: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: André
authors: A
authors: Tortamano
authors: Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of Sao Paulo, Sao Paulo, SP, Brazil.
authors: João B
authors: JB
authors: Paiva
mesh_terms: D000096:Acetone / Q000737:chemistry; D000134:Acid Etching, Dental / Q000379:methods; D000537:Aluminum Oxide / Q000737:chemistry; D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000648:ultrastructure; D045662:Dental Etching / Q000379:methods; D003902:Detergents / Q000737:chemistry; D008422:Materials Testing; D020366:Methylmethacrylate / Q000737:chemistry; D016910:Orthodontic Brackets; D010756:Phosphoric Acids / Q000737:chemistry; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012997:Solvents / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003902:Detergents; D010756:Phosphoric Acids; D019279:Resin Cements; D012997:Solvents; C477791:Sondhi Indirect Bonding Resin; D000096:Acetone; D020366:Methylmethacrylate; C030242:phosphoric acid; D000537:Aluminum Oxide
keywords: Bond strength; custom bases cleaning methods; indirect bonding; orthodontic brackets