Objectives . The purpose of this study was to compare the ability of two adhesion test methods to differentiate performance of three dental adhesives on uncut enamel.
Materials and methods . Adhesives tested were Adper™ Scotchbond™ SE Self-Etch Adhesive (SBSE, 3M ESPE), Adper™ Prompt™ L-Pop™ (Prompt, 3M ESPE) and Adper™ Single Bond Plus (SB+, 3M ESPE). Test specimen was prepared by applying an adhesive per manufacturer’s instructions on the cleaned, unground facial enamel surface of a bovine incisor tooth. The adhesive surface was build up with Filtek™ Z250 Universal Restorative (3M ESPE). Microtensile test specimen were prepared by storing the tooth for 24 h in tap water at 37 °C, followed by sectioning the tooth perpendicular to the bonding surface with a precision diamond saw to obtain 1 mm × 1 mm wide; 8–9 mm long rectangular sticks. Tensile testing was done in a two-part jig at a crosshead speed of 1 mm/min until failure. Shear bond strength was measured according to a notched-edge shear method (Ultradent™), after 24 h storage of the test specimen in water at 37 °C.
| Adhesive | Microtensile bond strength [MPa] | Shear bond strength [MPa] | ||||
|---|---|---|---|---|---|---|
| Average | std. dev. | N | Average | std. dev. | N | |
| SB+ | 42.7 (a) | 13.1 | 26 | 38.9 (c) | 9.8 | 26 |
| Prompt | 37.4 (a) | 19.9 | 27 | 25.4 (d) | 8.0 | 25 |
| SBSE | 26.9 (b) | 11.1 | 20 | 33.4 (c) | 10.1 | 27 |
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