Abstract
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.