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|