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Figure 1. Transmission electron micrographs (TEM) of undemineralized specimens. (A) Unstained section of the resin-dentin interface in a specimen bonded by means of the self-etch ABF system. A 1-µm-thick hybrid layer (H) could be seen within the partially demineralized dentin. Sodium fluoride crystals (pointer) were present in the filled adhesive (A). D, undemineralized sound dentin. (B) Stained section of the resin-dentin interface in a specimen bonded with the total-etch adhesive Single Bond. A thick layer of the polyalkenoic acid copolymer (P) component of the adhesive (A) was formed on top of a 5-ìm-thick hybrid layer. C, resin composite; U, undemineralized sound dentin.
