What structure forms when resin infiltrates the demineralized dentin matrix and binds with collagen?

What structure forms when resin infiltrates the demineralized dentin matrix and binds with collagen?

• A. Hybrid layer
• B. Adhesive layer
• C. Resin tags
• D. Interfacial zone

Answer: (A)

When resin infiltrates the demineralized dentin matrix and binds with collagen, a resin–dentin interface called the hybrid layer forms. After acid etching, the mineral component is removed and a collagen network is exposed. Resin monomers infiltrate this exposed collagen and, upon polymerization, lock into the collagen fibrils to create a continuous, resin-embedded layer within the dentin. This hybrid layer provides the primary micromechanical bond between the tooth and the adhesive resin. Resin tags are extensions of resin into the dentinal tubules and can contribute to retention, but they are separate from the main hybrid layer. The interfacial zone is the broader region at the boundary that includes the hybrid layer and any adhesive layer, but the specific structure formed by resin infiltrating collagen is the hybrid layer.

When resin infiltrates the demineralized dentin matrix and binds with collagen, a resin–dentin interface called the hybrid layer forms. After acid etching, the mineral component is removed and a collagen network is exposed. Resin monomers infiltrate this exposed collagen and, upon polymerization, lock into the collagen fibrils to create a continuous, resin-embedded layer within the dentin. This hybrid layer provides the primary micromechanical bond between the tooth and the adhesive resin.

Resin tags are extensions of resin into the dentinal tubules and can contribute to retention, but they are separate from the main hybrid layer. The interfacial zone is the broader region at the boundary that includes the hybrid layer and any adhesive layer, but the specific structure formed by resin infiltrating collagen is the hybrid layer.