Influence of photodynamic and sonodynamic disinfection on the bond strength of caries-affected dentin bonded to three different tooth-colored restorative materials: A comparative study.

AIM AND

OBJECTIVES

The aim of the study was to evaluate the influence of photodynamic and sonodynamic disinfection on the bond strength of caries-affected dentin bonded to three different restorative materials, i.e. Cention N, RMGIC, and Synergy D6.

METHODS

One hundred and eight carious and 18 noncarious teeth were collected, ground to expose affected dentin, and were arbitrarily allocated into 12 groups (n = 9). Fifty-four samples were disinfected with photodynamic therapy (PDT) and the other half with sonodynamic therapy (SDT). Samples were further randomly subdivided based on photosensitizers used methylene blue (M) (100 mg/ml) or indocyanine green (I) (500 mg/ml). Each sample was bonded to Cention N (C)/RMGIC (R)/Synergy D6 (S) and was subjected to shear bond strength (SBS) testing. Data were analyzed using ANOVA, post hoc Tukey, and unpaired t-test and the level of significance was established at P ≤ 0.05.

RESULTS

All tested materials showed the highest SBS with SDT irrespective to the dye used. Indocyanine green enhanced the SBS of all tested materials compared to methylene blue (P < 0.05) (photodynamic indocyanine Synergy D6 vs. photodynamic methylene Synergy D6 = 8.61, 7.16; photodynamic indocyanine RMGIC vs. photodynamic methylene RMGIC = 4.95, 4.06; photodynamic indocyanine Cention N vs. photodynamic methylene Cention N = 6.44, 5.56 and sonodynamic indocyanine Synergy D6 vs. sonodynamic methylene Synergy D6 = 9.52, 8.53; sonodynamic indocyanine RMGIC vs. sonodynamic methylene RMGIC = 9.75, 5.37; sonodynamic indocyanine Cention N vs. sonodynamic methylene Cention N = 7.48, 6.44).

CONCLUSION

Besides their antimicrobial action, PDT and SDT techniques can augment the bond strength of carious dentin with restorative material. Nanocomposites bond stronger postdisinfection as compared to RMGIC and Cention N.