Objectives: This study investigated the effects of long-term storage on the shear bond strengths (SBS) of a new two-bottle self-etch adhesive AdperTM ScotchbondTM SE (SBSE, 3M ESPE) versus a fifth generation total-etch adhesive, AdperTM Single Bond Plus (SB+, 3M ESPE) on two substrates: bovine cut enamel (E) and superficial dentin (D).
Methods: A notched-edge shear method was used to measure the SBS to bovine E and D (composite: FiltekTM Z250 A2, 3M ESPE). Bonded specimens were stored in water at 37C and tested after storage intervals of 24 hr (baseline data, "t=0") and 3, 6, 9, 12 and 18 months.
Results: Mean (std dev) SBS in MPa and p-values (two-sample t-tests, p<0.05) are listed in the table.
Storage Time (mo) | SBSE, E | SB+, E | SBSE, D | SB+, D |
0 | 41.6 (7.3) n=8 | 28.0 (6.2) n=7 | 36.0 (5.5) n=7 | 37.3 (6.7) n=7 |
3 | 38.6 (4.8) n=8 | 38.1 (2.9) n=8 | 42.1 (7.8) n=8 | 43.9 (6.5) n=7 |
6 | 37.8 (4.2) n=8 | 37.5 (5.8) n=8 | 37.3 (6.2) n=7 | 43.6 (5.3) n=8 |
9 | 37.3 (5.6) n=8 | 38.1 (4.4) n=7 | 35.6 (8.7) n=7 | 45.0 (10.4) n=7 |
12 | 39.5 (7.8) n=8 | 31.4 (8.0) n=8 | 31.8 (5.4) n=8 | 30.8 (5.2) n=6 |
18 | 38.4 (5.2) n=8 | 38.2 (3.6) n=8 | 32.6 (3.1) n=8 | 33.9 (5.7) n=8 |
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p-value, t=0 vs. 18 mo. | 0.330 | 0.002 | 0.149 | 0.308 |