Objectives : This study investigated the bonding efficacy of Adper™ Easy Bond (EB, 3 M ESPE), a 7th generation adhesive, when used in total-etch (5th generation) mode on either moist (EB-TE-moist) or dry (EB-TE-dry) superficial bovine dentin. The moist or dry condition of the tooth is after etching. The dry condition represents a product misuse scenario.
Materials and methods : A notched-edge shear method was used to measure the shear bond strengths (SBS) to dentin (composite: Filtek™ Z250 A2, 3M ESPE). EB in standard self-etch mode and the 5th generation adhesive Adper™ Single Bond Plus (SB+, 3M ESPE) were tested as controls. Bonded specimens were stored in water at 37 °C for 24 h. Half of the specimens were then randomly selected and tested for baseline data, and the remaining half were thermocycled between 5 and 55 °C (30 s each per cycle) and then tested after 7000 cycles.
|Number of cycles||EB (control)||EB-TE-moist||EB-TE-dry||SB+ (control)|
|0 (baseline)||28.2 (4.6)||35.4 (4.3)||29.5 (9.7)||29.4 (7.5)|
|7000||39.1 (5.2)||42.0 (2.3)||37.8 (5.3)||34.1 (5.7)|
|p -Value, 0 vs. 7000 cycles||0.001||0.002||0.052||0.188|
|p -Value vs. EB-TE-dry, 0 cycles||0.738||0.140||NA||0.989|
|p -Value vs. EB-TE-dry, 7000 cycles||0.625||0.060||NA||0.198|