Adhesion

Question 1

Give Reason
It is difficult to obtain adhesion to tooth structure.

Answer 1

-Inhomogenous composition of enamel and dentin🔀
-Unfavorable irregularities in the prepared cavity 📶
-Debris in the prepared cavity 🍝
-presence of 🚿 (should be dry).

Question 2

Give Reason
Waxes are not easily wet by water.

Answer 2

Due to their low surface energy.🤒

Question 3

Give Reason
The presence of debris on the adherend surface affects the strength of the adhesive junction.

Answer 3

Because the presence of debris decreases the surface energy of the adherend and also prevents the adhesive from coming in direct contact with the adherend which is necessary to produce adhesion.🤮