IADR Abstract Archives
Bond Strength of Self–Etching Adhesives to Enamel and Dentin in-Vitro
Purpose: To evaluate shear bond strength of new self-etching adhesives to dentin, cut-enamel, and uncut enamel and the effect of storage time on bonds to cut enamel.
Methods: Seven adhesive systems were tested: A. Adper- Prompt (3M ESPE); B. AdheSE (Ivoclar); C. G-bond (GC); D. I-Bond (Heraus Kulzer) E. Xeno IV (Densply); F. Xeno III (Densply) and G. Adper Single + (3M ESPE). Mounted extracted teeth were prepared by either sectioning through the dentin layer (Dentin Group), abrading the surface enamel (Cut–Enamel Group) or cleaning with pumice (Uncut-Enamel Group). Composites resins (corresponding manufacturers) were bonded to all surfaces using a mold with a 2mm cylindrical opening. Shear bond strengths were tested (Instron) after 24 Hrs water storage at room temperature (n=315). Cut enamel (n=105) samples were also tested after 20 weeks of water storage. ANOVA was used for analysis.
Results:
|
Group
Substrate |
Time |
A |
B
|
C
|
D
|
E
|
F
|
G |
| Dentin |
24 Hrs |
29.3 (11) |
25.35 (12) |
28.77 (6) |
19.87 (8) |
31.74 (6) |
21.22 (9) |
27.22 (12) |
| Enamel UC |
24 Hrs |
24.73 (11) |
22.87 (7) |
27.35 (6) |
18.58 (7) |
22.14 (7) |
23.61 (7) |
30.87 (7) |
| Enamel C |
24 Hrs |
22.71 (7) |
21.09 (6) |
26.84 (7) |
21.88 (4) |
25.3 (7) |
21.68 (8) |
28.88 (11) |
|
Enamel C |
20 Wks |
24.9 (8.6) |
18.24 (5) |
27.1(6.1) |
16.6(11.6) |
20.08(7.7) |
18.24 (9) |
28.28 (6.3) |
Conclusions: Bonds to dentin in groups A, C, E and G were not significantly different. Bonds in groups D and F were significantly lower (p=0.5)..
Groups C, D, F, and G did not exhibit a difference in bonds to the various substrates. A significant difference in bonds to cut enamel after 24 hr vs. 20 week storage was found in groups D and E. The study confirms the potential of new self-etching adhesive systems to perform at levels similar to conventional systems.