Influence of enamel surface preparation on composite bond strength.
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.
Matos
Adriana Bona
AB
Department of Operative Dentistry, University of São Paulo, São Paulo Dental School, Brazil.
Tate
William H
WH
Powers
John M
JM
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
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