Question 324 · LDEK · Adhesive systems
Indicate the true statements concerning enamel adhesion:
1) it relies on the formation of microtags within the enamel structure;
2) etched enamel looks like a honeycomb under SEM magnification;
3) 37% phosphoric acid is the most commonly used etching agent;
4) acid-etching transforms the smooth enamel into an irregular surface ready for adhesion;
5) etching agent incorporates the smear layer into the interface tooth-composite;
6) enamel bonds chemically with the collagen from the bonding agent.
The correct answer is:
2) etched enamel looks like a honeycomb under SEM magnification;
3) 37% phosphoric acid is the most commonly used etching agent;
4) acid-etching transforms the smooth enamel into an irregular surface ready for adhesion;
5) etching agent incorporates the smear layer into the interface tooth-composite;
6) enamel bonds chemically with the collagen from the bonding agent.
The correct answer is:
- A. 1,3,4,5.
- B. 1,2,3,4.
- C. 2,3,5,6.
- D. 3,4,5,6.
- E. 3,4,5.
Hint
Think about what acid etching does to enamel prisms, and whether enamel contains collagen or keeps a smear layer after phosphoric acid.
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