Objectives : It is known that cross-linking agents, such as carbodiimide (EDC), are effective at reducing matrix metalloproteinases (MMPs) activity, when it is applied to acid-etched dentin. The purpose of this study was to evaluate the µTBS using experimental all-in-one adhesives containing EDC, after immersion in water for 24 hours.
Methods : Five experimental all-in-one self-etching adhesives (13wt% 4-META; 15% comonomers; 43% aceton; 28% water; 1% CQ) containing 0, 0.5, 1, 2 or 3% EDC were used in this study. The dentin surfaces of three teeth in each group were treated with one of the self-etching adhesive for 20 sec, followed by resin composite built-up to 5 mm thick with Clearfil AP-X. Resin-bonded teeth were vertically sectioned into slabs after 24 hours storage in water. Each slab was cut to a dumbbell shaped specimens for µTBS.
Results : The µTBS of experimental adhesives containing 0.5 or 1% EDC were not different from the same experimental adhesive containing 0% EDC (Control), while experimental adhesives containing 2 or 3% gave lower µTBS than the control. (One-way ANOVA, Tukey’s test;
p<0.05). Incorporating 2 or 3% EDC into all-in-one self-etching adhesive inhibited the µTBS seen in non-EDC treated controls after 24 hours. High concentrations of EDC may cause lower polymerization of adhesive resin.
Conclusion: The addition of up to 1% EDC in all-in-one adhesive did not lower the 24 hrµTBS.
|
Experimental
adhesive
|
Experimental
adhesive
Plus (0.5% EDC)
|
Experimental
adhesive
Plus (1% EDC)
|
Experimental
adhesive
Plus (2% EDC)
|
Experimental
adehsive
Plus (3% EDC)
|
µTBS
(MPa ± S.D.)
|
42.6 ± 8.2A
|
43.1 ± 11.5A
|
41.7 ± 11.2A
|
14.0 ± 7.9B
|
5.3 ± 2.2B
|