title: Influence of enamel surface preparation on composite bond strength.
abstract: OBJECTIVE
  To evaluate the influence of air-particle abrasion and treatments on in vitro tensile bond strength of resin composite bonded to human enamel was evaluated using a single-bottle adhesive.
  
  
  METHODS
  Human teeth were divided into 12 groups of three treatments (none, 27-microm Al2O3 air-particle abrasion, 50-microm Al2O3 air-particle abrasion) and four conditioners [none, phosphoric acid (PA), NRC (no-rinse conditioner), and PA/NRC]. Bonding agent (Prime & Bond NT) and a resin composite (TPH Spectrum) were applied as inverted cones. Specimens were stored for 24 hours at 37 degrees C and debonded in tension using a testing machine at 0.5 mm/minute.
  
  
  RESULTS
  Phosphoric acid treatment used with Prime & Bond NT produced the best bond strengths (24 MPa) to enamel for surfaces treated with 27-microm air-particle abrasion and for surfaces not treated with air-particle abrasion (control). With one exception, air-particle abraded surfaces resulted in bond strengths between 9 to 16 MPa. NRC with or without the use of phosphoric acid in general did not improve tensile bond strength to enamel when compared to surfaces not treated with NRC.
authors.affiliation: Department of Operative Dentistry, University of São Paulo, São Paulo Dental School, Brazil.
authors.forename: Adriana Bona
authors.initials: AB
authors.lastname: Matos
authors.forename: William H
authors.initials: WH
authors.lastname: Tate
authors.forename: John M
authors.initials: JM
authors.lastname: Powers
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods*; D000388:Air; D000537:Aluminum Oxide / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D019243:Enamel Microabrasion / Q000379:methods*; D006801:Humans; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D010756:Phosphoric Acids / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D013718:Tensile Strength
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; D008298:Maleates; D010756:Phosphoric Acids; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C467914:TPH spectrum; C444699:non-rinse conditioner; D000537:Aluminum Oxide