Microtensile bond strengths of one-bottle dentin adhesives.
OBJECTIVE
To investigate the in vitro performance of three one-bottle adhesives by measuring their dentin microtensile strength.


METHODS
Extracted human molars had the dentin exposed on the occlusal surface. The teeth were randomly assigned to three dentin adhesives: Group 1 - Prime & Bond 2.1; Group 2 - Prime & Bond NT; and Group 3 - Experimental (unfilled NT). All materials were applied as recommended by the manufacturer. A high-density resin composite (Surefil) was packed on the bonding area in five increments. Specimens (sticks) were obtained using a diamond disc and were stored in distilled water for 24 hrs. The microtensile bond strengths were measured with a universal testing machine.


RESULTS
Group 1: 54.3+/-15.6 MPa; Group 2: 62.0+/-17.6 MPa; Group 3: 54.6+/-16.8 MPa. Although no statistically significant difference was found between pairs of means, Prime&Bond NT showed a tendency for higher bond strengths.
Cardoso
P E
PE
Depto. de Materiais Dentários, Cidade Universitária, São Paulo, SP, Brazil. capel@fo.usp.br
Carrilho
M R
MR
Francci
C E
CE
Perdigão
J
J
D000096:Acetone / Q000737:chemistry; D000134:Acid Etching, Dental; D000704:Analysis of Variance; D003188:Composite Resins / Q000737:chemistry; D001840:Dental Bonding; D003799:Dental Stress Analysis / Q000295:instrumentation; D003804:Dentin / Q000648:ultrastructure; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008963:Molar; D011109:Polymethacrylic Acids / Q000737:chemistry; D013718:Tensile Strength; D013997:Time Factors; D014867:Water
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C403464:SureFil packable composite; C444444:prime and bond 2.1; D014867:Water; D000096:Acetone