Permalink : http://hdl.handle.net/2115/58247

KEYWORDS : Microtensile bond strength;All-in-one adhesive;Failure modes;Application time

The purpose of this study was to evaluate the effects of different application times in all-in-one systems on micro-tensile bond strength. Three all-in-one systems, EB （Easy Bond, 3M ESPE, St. Paul, MN, USA）, BB （BeautiBond, Shofu Inc., Japan） and BF （BondForce, Tokuyama Denetal, Ibaraki, Japan）were used with four different application times: 10s, 20s, 30s, and 40s. Bond strengths to dentin were determined using μTBS test after 24h of water storage at 37℃. In addition, an evaluation of both resin-dentin interface, and fractured surface on dentin side was performed by SEM. The maximum μTBS for each system was observed with a 20s application time. There was no positive correlation between the thickness of hybrid layers and application time, which meant hybrid layers did not increase in thickness along with the increase in application time, rather a difference of quality was detected. Prolonged application time affected the adhesive strength of all-in-one systems, and they were mostly effective for the 20s application time.