Class I Amalgam

Question 1

Which walls are internal walls?

Answer 1

axial and pulpal

Question 2

What are walls that contact the cavosurface margins of the preparation?

Answer 2

external walls

Question 3

For amalgam how wide should the marginal ridge be for a premolar and what instrument can it be measured with?

Answer 3

1.2mm (hatchet)

Question 4

For amalgam how wide should the marginal ridge be for a molar and what instrument can it be measured with?

Answer 4

1.5mm (hoe)

Question 5

In order for the bur to be perpendicular to the occlusal plane, how should the bur be oriented in respect to maxillary teeth?

Answer 5

along the long axis of the tooth

Question 6

In order for the bur to be perpendicular to the occlusal plane, how should the bur be oriented in respect to mandibular teeth?

Answer 6

with a slight tilt because of the orientation of the occlusal table

Question 7

True or False? The pulpal floor should be parallel to the imaginary line joining the tips of the lingual and buccal cusps.

Answer 7

True

Question 8

What is the ability of the restorative material and the tooth not to fracture once placed into function?

Answer 8

resistance form

Question 9

What are the 5 factors that make good resistance form?

Answer 9

• box shape
• flat pulpal wall
• adequate bulk of amalgam
• defined internal line angles
• marginal ridge integrity

Question 10

True or False? All enamel rods must be supported by dentin.

Answer 10

True

Question 11

True or False? Mesial and distal walls should be slightly divergent while lingual and buccal walls should be convergent.

Answer 11

True

Question 12

What is the shape of the prepared cavity that resists displacement or removal of the restoration from lifting or tipping forces?

Answer 12

retention form

Question 13

What is the ability of the operator to visualize all remaining caries and to also be able to use the appropriate instruments in the preparation?

Answer 13

convenience form

Question 14

True or False? For additional caries after initial prep, the pulpal wall is modified only in the area of the caries.

Answer 14

True

Question 15

What angle should the cavosurface margin be to produce maximum effectiveness for amalgam?

Answer 15

90-110 degrees

Question 16

What is the sequence of preparation for amalgam?

Answer 16

• visualize occlusal outline
• execute outline
• refine the outline for smooth cavosurface margins
• modify the pulpal wall in the area of caries
• remove carious dentin with hand instrument or round bur on slow speed