title: Influence of food-simulating liquids on bond strength of brackets bonded with a HEMA-free and HEMA-containing self-etching primer.
abstract: OBJECTIVE
  To evaluate the effect of food-simulating liquids on bond strengths of brackets bonded with a HEMA-free and a HEMA-containing self-etching primer.
  
  
  METHODS
  Brackets were bonded to 280 bovine incisors that were divided into two groups: (1) Adper Prompt-L-Pop (Adper PLP)/Transbond-XT and (2) Transbond Plus self-etching primer (TSEP, HEMA-free)/Transbond-XT. Each group was evaluated under different storage conditions: 24 hours in water, thermocycling (T), T/12 weeks in water, T/12 weeks in 10% ethanol, T/12 weeks in 50% ethanol, T/12 weeks in 3% acetic acid, and T/12 weeks in olive oil. Shear bond strength was measured with a universal test machine.
  
  
  RESULTS
  TSEP and Adper PLP showed a significantly higher bond strength at 24 hours than at T/12 weeks in 50% ethanol (P  =  .000). For Adper PLP, the bond strength at 24 hours was significantly higher than T/12 weeks in water (P  =  .000). Significant differences were not detected between the two bonding procedures for the different storage conditions (P > .05).
  
  
  CONCLUSIONS
  Owing to its hydrophilic nature, the bond strength produced by Adper PLP (a HEMA-containing self-etching primer) decreased significantly after T/12 weeks in water. Brackets bonded with both TSEP and Adper PLP showed significantly higher bond strengths at 24 hours than at T/12 weeks in 50% ethanol, probably due to the effect of ethanol at 50% on Transbond-XT.
authors.affiliation: Department of Orthodontic, Faculty of Medicine, University of Murcia, Murcia, Spain.
authors.forename: Ascensión
authors.initials: A
authors.lastname: Vicente
authors.forename: Sara
authors.initials: S
authors.lastname: Molina
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Ortiz
authors.forename: Luis A
authors.initials: LA
authors.lastname: Bravo
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D000818:Animals; D002417:Cattle; D001840:Dental Bonding / Q000379:methods; D003799:Dental Stress Analysis / Q000295:instrumentation; D000431:Ethanol / Q000737:chemistry; D005502:Food; D057927:Hydrophobic and Hydrophilic Interactions; D055115:Light-Curing of Dental Adhesives; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry*; D031658:Olea; D000069463:Olive Oil; D016910:Orthodontic Brackets; D010938:Plant Oils / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry*; D033081:Shear Strength; D012997:Solvents / Q000737:chemistry; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry
chemical_list: D008689:Methacrylates; D000069463:Olive Oil; D010938:Plant Oils; C408584:Prompt L-Pop; D019279:Resin Cements; D012997:Solvents; C429625:Transbond Plus Self-Etching Primer; C477790:Transbond XT; D014867:Water; D000431:Ethanol; C005044:hydroxyethyl methacrylate; D019342:Acetic Acid