Effect of 2% iodine disinfecting solution on bond strength to dentin

Disinfection of dentin surfaces is desirable so long as it does not interfere with subsequent bonding of adhesive resins.

To test the null hypothesis that bond strengths to dentin are not affected by previous application of an iodine disinfecting solution.

Twenty-four extracted non-carious molars were selected. Occlusal enamel was removed producing a flat dentin substrate. Test teeth were all treated with 2% Iodine disclosing/disinfecting solution (I(2)DDS) for 20 sec and rinsed for 20 sec followed by the application of self- or total- etching bonding systems, generating five adhesive groups (n=3): Single Bond; Prime & Bond NT; Clearfil SE Bond; Opti-Bond Plus. The control groups (n=3 per adhesive) had no disclosing/disinfectant application prior to adhesive application. A 4-mm thick resin restoration was built up on each tooth for microtensile testing. Statistical analyses between experimental and control groups were performed by student's t-test (alpha= 0.05).

In general, experimental groups (previously treated with I(2)DDS) showed significantly lower bond strength values when compared with their respective controls (p<0.05), except for group Prime & Bond I(2) that did not significantly differ from its control (p>0.05).

Acetone-base adhesive systems seem not to be affected by the application of I(2)DDS prior to etching and bonding procedures.