Question 98 (part 2) · LDEK · Fluoride
During the amelogenesis, fluoride:
1) serves as an inhibitor of mineral phase of enamel, which constitutes of hydroxyapatites;
2) replaces the hydroxyl ions causing the formation of fluorapatite/fluorhydroxyapatite;
3) promotes the correct formation of crystal structure of optimal physicochemical enamel stability, thus preventing the screw and edge spatial dislocations;
4) promotes formation of smaller apatite crystals with higher carbonate content;
5) inhibits the process of water and organic substances elimination from newly shelved enamel, i.e. in pre-eruptive enamel maturation.
Correct answer is:
2) replaces the hydroxyl ions causing the formation of fluorapatite/fluorhydroxyapatite;
3) promotes the correct formation of crystal structure of optimal physicochemical enamel stability, thus preventing the screw and edge spatial dislocations;
4) promotes formation of smaller apatite crystals with higher carbonate content;
5) inhibits the process of water and organic substances elimination from newly shelved enamel, i.e. in pre-eruptive enamel maturation.
Correct answer is:
- A. 2,3.
- B. 2,3,4.
- C. 1,2,3,5.
- D. 2,4,5.
- E. 1,3,4,5.
Hint
During enamel formation fluoride acts as a catalyst of apatite crystallization and alters crystal composition so as to reduce solubility.
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