Microtensile bond strength of total-etch and self-etch adhesives to the enamel walls of Class V cavities.
OBJECTIVE
To determine the difference in microtensile bond strengths (MTBS) of resin-based composite bonded to the enamel of cavity preparations using a conventional or a self-etching adhesive.


METHODS
Buccal and lingual Class V cavities were prepared in each of 12 caries-free human molars. Six teeth were randomly selected to be restored with Spectrum TPH resin-based composite and Prime & Bond NT adhesive. The remaining six teeth were restored with the same composite and Prompt L-Pop self-etching adhesive. Enamel/composite sticks were cut from each specimen and subjected to microtensile bond testing. Each debonded specimen was evaluated by SEM to determine the mode of failure.


RESULTS
The mean MTBS for Prime & Bond NT specimens was 15.2+/-13.1 MPa. The mean MTBS for Prompt L-Pop self-etching adhesive samples was 18.2+/-14.3 MPa. ANOVA demonstrated no statistically significant difference between the mean MTBS associated with the two adhesives (P> 0.05). The results of SEM analysis revealed that the bonding failures occurred primarily at the interface between the adhesive and the enamel, suggesting a primarily adhesive failure.
Kelsey
William P
WP
Creighton University School of Dentistry, Omaha, NE 68178, USA. wpkelsey@creighton.edu
Latta
Mark A
MA
Vargas
Marco A
MA
Carroll
Lucinda R
LR
Armstrong
Steven R
SR
D000134:Acid Etching, Dental / Q000379:methods; D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D003743:Dental Enamel; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D008422:Materials Testing; D008963:Molar; D011109:Polymethacrylic Acids; D011897:Random Allocation; D019279:Resin Cements; D013718:Tensile Strength
D003188:Composite Resins; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; C408584:Prompt L-Pop; D019279:Resin Cements; C467914:TPH spectrum