Figure 2.
SEM images of the bonded interface of resin-dentin specimens assayed 24 h and after thermocycling aging. The pointers depict water-trees into the adhesive layer, arrows represent a fracture, and circles highlight silver infiltration into the hybrid layer. NC: Negative Control; CARD: Cardanol; PAC: Proanthocyanidin; LIG: Lignin; C: composite layer; Ad: adhesive layer; HL: hybrid layer; D, dentin. NC showed water-trees and striking silver uptake both in both 24 h and after aging. CARD and PAC showed areas of silver uptake both in 24 h and after aging. Water-trees were found only with PAC after aging. LIG1, LIG2 and LIG4 showed similar areas of silver uptake in HL but very little nanoleakage after aging.