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.
Results : Mean (std dev) SBS in MPa and p -values (two-sample t -tests, p < 0.05) are listed in the table ( n = 8).
| 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 |
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