Question 45 · LDEK · Adhesive systems

Which of the following statements concerning the adhesion of composite resin materials to dentin is true?

1. AA. achieving reliable adhesion to the layers of dentin that lie adjacent to the pulp is more difficult, as the number of dentinal tubules and their diameter is bigger in the pulp area than in the areas located further away from the pulp.
2. BB. achieving adhesion to the layers of dentin that lie adjacent to the pulp is easier due to the lower surface wetness of dentin in this area caused by lower amounts of tubular fluid.
3. CC. dentin is a hydrophobic tissue, therefore achieving mechanical adhesion to dentin does not pose clinical difficulties.
4. DD. it is possible to achieve the adhesion of composite resin materials to dentin without removing or modifying the smear layer.
5. EE. the only dental materials that exhibit spontaneous adhesion to dentin without the necessity of preparing tooth structure are flowable composite resin materials.