Figure 1
Representative of SEM images of dentin surface after treatment of each group. (A) ×500, G1 (F = 4 J/cm2, PO = 0), some of the dentin surface remained intact, clear ridges and valleys were produced, the dentin surface seemed rougher but regular; G2 (F = 4 J/cm2, PO = 50%), the dentin surfaces were flatter, no smear layer was observed; (C) ×500, G3 (F = 6 J/cm2, PO = 0), some of the dentin surface remained intact, clear ridges and valleys were produced, the dentin surface seemed rougher but regular; (D) ×500, G4 (F = 6 J/cm2, PO = 50%), the dentin surfaces were flatter, no smear layer was observed; (E) ×500, G5 (F = 8 J/cm2, PO = 0), the dentin surface were flatter, ridges and valleys were not obvious, no smear layer was observed; (F) ×500, G6 (F = 8 J/cm2, PO = 50%), the dentin surfaces were flatter, no smear layer was observed; G7 (Er:YAG laser), irregular and scaly morphology with open dentinal tubules could be observed, no smear layer could be observed; G8 (control group), smooth surface covered with debris, dentin tubules are closed based on smear layer.
