Cement Base Materials

Question 1

Setting time of polycarboxylate cement?

Answer 1

2-6 minutes

Question 2

Why is polycarboxylate cement is suitable for sensitive teeth?

Answer 2

Because polyacrylic acid has large sizes of molecules so can’t penetrate into dentinal tubules

Question 3

Manipulation of polycarboxylate?

Answer 3

-using cooled slab(increasing working time)
-mixing should be done within 30-40 second
-the liquid should not be dispensed until just prior to the time of mixing (to avoid evaporation of water)

Question 4

Patient with high caries index,which type of cement should we use?why?

Answer 4

Glass ionomer cement,because it releases fluoride

Question 5

Is Glass ionomer sensitive to water?

Answer 5

Yes and the field must isolated completely

Question 6

Wich type of bonding in :-
1-polycarboxylate cement
2-glass ionomer cement

Answer 6

1-chemical adhesion to enamel and dentin wich carboxylate groups chelate with calcium in dentin and enamel
2-ionic interaction with calcium and phosphate from the surface of enamel and dentin

Question 7

How can I increase bonding of glass ionomer cement?

Answer 7

Etching with 37% phosphoric acid ,producing porosities on the surface so mechanical retention will be achieved

Question 8

Bonding in resin cement?

Answer 8

Acid-etch technique

Question 9

Polymerisation is achieved in resin cement by?

Answer 9

1-light cure
2-self cure
3-dual cure

Question 10

The amount of fillers within resin cement?

Answer 10

40%-80%

Question 11

The functions of Fillers in resin cement?

Answer 11

1-higher mechanical properties
2-reduce polymerisation shrinkage
3-lower coefficient thermal expansion