Question 65 · LDEK · Adhesive systems
Indicate the false statement concerning the adhesion of restorative materials to tooth tissues:
- A. penetration of resin to etched enamel is a fundament of composite-enamel adhesion.
- B. smear layer reduces the permeability of the dentin for bonding agents.
- C. etching of the dentin exposes collagen fibers and provides micromechanical adhesion of resin to the dentin.
- D. phosphoric acid in concentration over 40% should not be used for enamel etching.
- E. the enamel contains 10-12% of water, which makes it hydrophilic.
Hint
Compare the water and organic content of enamel with that of dentin.
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