Operative Dentistry MCQ 06

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What makes a glass ionomer a true glass ionomer?

1. It must have an acid-base reaction (i.e. metal + acid= salt). You must mix materials together to have a true glass ionomer.
2. Calcium ions are gradually replaced by Aluminum ions to produce a more cross linked, more mechanically stronger material.
3. Glass ionomers are materials consisting of ion-cross linked polymer matrices surrounding glass-reinforcing filler particles.
4. Fluoride is an integral part of the matrix formation.
5. Polyacrylic acid may be freeze dried-(anhydrous) and combined with aluminosilicate powder.
6. Water is a key ingredient for the setting reaction.

1. All the above are true

2. none are true

3. 1,2,4 are true

4. 1,2,3,5,6 are true

5. 4,5,6 are true

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