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Thursday, January 24, 2008

Operative Dentistry MCQ 06

Thursday, January 24, 2008

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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