Question 271 · LDEK · Glass ionomer cements
The highest amounts of fluoride ions are released from glass-ionomer cements:
- A. directly after the cement is placed in the cavity and the setting reaction concludes - it can be attributed to the release of fluoride ions from the glass particles in the material structure itself.
- B. 30 days after the cement is placed in the cavity, which is due to the maturation of the cement structure.
- C. 30 days after the cement is placed in the cavity, which is due to a gradual ion exchange within the cement matrix.
- D. between the 3rd and 6th month after the cement is placed in the cavity; it can be attributed to high cement stability gained in this period.
- E. the amounts of fluoride ions that are released from the cement do not change over time.
Hint
Think of the 'burst effect' that occurs while the cement is setting and the glass particles are being attacked by acid.
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