Bond strength to deep coronal dentin: effect of bonding strategies.
OBJECTIVE
The aim of this study was to evaluate bond strength at the composite-adhesive-deep dentin interface following pre-treatment with sodium hypochlorite using 4 different types of enamel-dentin adhesive and a composite for the core.


METHODS
From 60 healthy human molars, cylindrical samples (3 mm high) were obtained using a special slow-speed saw. Cavities with 2-5-mm diameters were made in all the samples. Samples were assigned to 8 groups, 4 groups were designated as experimental groups and were irrigated with NaOCl and the other 4 groups designated as control groups were irrigated with distilled water. Adhesive systems were applied to the samples and then restored using a core build-up composite. Samples were subjected to shear stress test using an electronic dynamometer.


RESULTS
The data were analyzed using one-way ANOVA and the Tukey test (P<0.05). The results, in terms of bond strength, demonstrate that the two-step self-etch adhesive systems generate a stronger bond than the other systems considered in the study (P<0.05). The results also show that pre-treatment with hypochlorite does not seem to influence the bond strength of self-etch adhesive systems.


CONCLUSIONS
This in vitro study demonstrates that there exist differences in bond strength between self-etch and etch & rinse adhesive systems on deep dentin pretreated with sodium hypochlorite to simulate endodontic treatment.
Giovannone
T
T
Unit of Endodontics, Department of Conservative Dentistry, La Sapienza University, Policlinico Umberto I, Rome, Italy.
Migliau
G
G
Bedini
R
R
Ferrari
M
M
Gallottini
L
L
D001840:Dental Bonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D006801:Humans; D012973:Sodium Hypochlorite / Q000494:pharmacology*; D019228:Tooth Crown
D017220:Dentin-Bonding Agents; D012973:Sodium Hypochlorite