EFDA Bases, Liners, and Matrices 2

Question 1

Which material is most commonly used as a cavity liner under composite resin restorations to promote pulpal healing?

Accepted Answer

Calcium hydroxide

Answer

Zinc phosphate cement

Answer

Glass ionomer base

Answer

Zinc oxide eugenol

Question 2

A Tofflemire retainer and matrix band are assembled with the retainer positioned on which surface of the tooth?

Accepted Answer

Buccal

Answer

Lingual

Answer

Occlusal

Answer

Incisal

Question 3

What is the primary purpose of using a matrix band when restoring a proximal surface?

Accepted Answer

To replace the missing tooth wall during condensation

Answer

To protect the pulp from thermal shock

Answer

To etch the enamel surface

Answer

To provide a base for the liner

Question 4

Which liner has the advantage of releasing fluoride while also bonding chemically to dentin?

Accepted Answer

Resin-modified glass ionomer

Answer

Calcium hydroxide

Answer

Zinc oxide eugenol

Answer

Copal varnish

Question 5

When placing zinc phosphate cement as a base, why must mixing be done on a cool glass slab?

Accepted Answer

To slow the exothermic reaction and extend working time

Answer

To speed up the setting reaction

Answer

To prevent moisture contamination

Answer

To increase the powder-to-liquid ratio

Question 6

Which wedge placement is correct when using a Tofflemire matrix system for a Class II restoration?

Accepted Answer

Gingival embrasure, buccal to lingual

Answer

Occlusal embrasure, buccal to lingual

Answer

Gingival embrasure, lingual to buccal

Answer

Occlusal embrasure, lingual to buccal

Question 7

Which base material is contraindicated under composite resin due to its eugenol content interfering with polymerization?

Accepted Answer

Zinc oxide eugenol (ZOE)

Answer

Resin-modified glass ionomer

Answer

Calcium hydroxide

Answer

Zinc phosphate cement