Objectives: This study investigated the effect of bonding to bovine enamel (E) and dentin (D) surfaces at various time points after their preparation. Adhesives from the 4th (OptiBond™ FL, OFL, Kerr), 5th (Adper™ Single Bond Plus, ASB+, 3M ESPE; OptiBond™ Solo Plus, OS+, Kerr), 6th (Clearfil™ SE Bond, CSE, Kuraray), and 7th (Adper™ Easy Bond, AEB, 3M ESPE) generations were tested.
Methods: Potted teeth were prepared to E and D surfaces with 120-grit followed by 320-grit sandpaper. Teeth were randomly selected for each day of testing. On test days 1, 2, and 3 the surfaces were refreshed by hand with 320-grit sandpaper. Bonded specimens were stored in water at room temperature and tested on the same day. A notched-edge shear method was used to measure adhesion (composite: Filtek™ Z250 A2, 3M ESPE).
Results: Mean(std dev) adhesion values in MPa and p-values (two-sample t-tests) are listed in the tables (n=5 unless otherwise noted).
OFL, E | ASB+, E | OS+, E | CSE, E | AEB, E | |
0 (control) | 34.5(4.9) | 29.0(4.0) | 25.9(5.6) | 27.6(4.6) | 22.0(2.1) |
1 | 31.0(7.4) | 29.9(4.2) | 28.6(3.7) | 31.4(3.5) | 24.2(3.2) |
2 | 44.9(2.7) | 30.9(5.2) | 27.7(6.9) | 33.4(3.5) | 23.0(2.9) |
3 | 26.3(10.5) | 29.8(6.9) | 28.1(3.9) | 32.4(6.7) | 23.7(3.0) |
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p-value, 0 vs. 3 days | 0.152 | 0.828 | 0.492 | 0.223 | 0.330 |
Days after Tooth Preparation | OFL, D | ASB+, D | OS+, D | CSE, D | AEB, D |
0 (control) | 36.6(9.7) | 29.1(5.9) | 39.3(4.4) | 33.3(8.4) | 29.3(1.3), n=4 |
1 | 32.4(9.5) | 28.8(5.9) | 35.2(5.1) | 28.0(6.3) | 26.9(2.7) |
2 | 34.2(5.0) | 33.1(4.8) | 39.4(6.3) | 35.2(5.4) | 30.7(4.0) |
3 | 29.7(8.8) | 33.0(2.7) | 33.4(11.1) | 27.5(10.4) | 28.1(1.9) |
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p-value, 0 vs. 3 days | 0.273 | 0.216 | 0.301 | 0.360 | 0.319 |
Conclusions: There were no statistical differences (p>0.05) in adhesion for any of the adhesives between 0 and 3 days after tooth preparation.