Fixed I - Seating and Finishing Metal Crowns

What are examples of disclosing agents when seating the crown?

- fitchecker

- occlude

- accufilm

- Liqua Mark

Occlude is what color?

green

Accufilm IV is what color?

blue

Liquia-Mark is what color?

red

What is the first step after the crown is pulled from the investing material?

clean the casting

What are ways to clean the casting?

- scrub with a brush

- ultrasonic cleaner

- air abrasion

- steam cleaner

What is zone 1?

A) sprue

B) proximal contacts

C) occlusal contacts

D) internal surface

E) internal margin

E) internal margin

What is zone 2?

A) sprue

B) proximal contacts

C) occlusal contacts

D) internal surface

E) internal margin

D) internal surface

What is zone 3?

A) sprue

B) proximal contacts

C) occlusal contacts

D) internal surface

E) internal margin

A) sprue

What is zone 4?

A) sprue

B) proximal contacts

C) occlusal contacts

D) internal surface

E) internal margin

B) proximal contacts

What is zone 5?

A) sprue

B) proximal contacts

C) internal margin

D) occlusal surface

E) axial walls

F) external margin

D) occlusal surface

What is zone 6?

A) sprue

B) proximal contacts

C) internal margin

D) occlusal surface

E) axial walls

F) external margin

E) axial walls

What is zone 7?

A) sprue

B) proximal contacts

C) internal margin

D) occlusal surface

E) axial walls

F) external margin

F) external margin

The external margin is?

A) zone 1

B) zone 3

C) zone 4

D) zone 6

E) zone 7

E) zone 7

The axial wall is?

A) zone 1

B) zone 3

C) zone 4

D) zone 6

E) zone 7

D) zone 6

What is the occlusal surface?

A) zone 1

B) zone 3

C) zone 4

D) zone 5

E) zone 7

D) zone 5

What zone is the proximal contacts?

A) zone 1

B) zone 3

C) zone 4

D) zone 5

E) zone 7

C) zone 4

What zone is the sprue?

A) zone 1

B) zone 3

C) zone 4

D) zone 5

E) zone 7

B) zone 3

What zone is the internal surface?

A) zone 1

B) zone 2

C) zone 3

D) zone 4

E) zone 5

B) zone 2

What zone is the internal margin?

A) zone 1

B) zone 3

C) zone 4

D) zone 5

E) zone 7

A) zone 1

The objective of the internal margin is to establish a ___ mm wide band of closely adapted metal

A) 1

B) 2

C) 3

D) 4

A) 1

True/False: nodules need to be removed before seating the crown on the die

True

True/False: you can fit the casting on the die before examining the internal surface of the crown

False

True/False: When removing nodules from the internal surface of the crown, you should always remove enough so that it makes a small divot into the surface

True

Internal nodules should be removed from the crown BECAUSE they can damage the die

A) statement true, reason true

B) statement true, reason false

C) statement false, reason false

D) statement false, reason true

A) statement true, reason true

What is the ideal cement space?

A) 10-20 microns

B) 20-40 microns

C) 40-60 microns

B) 20-40 microns

True/False: slightly tight contacts are better than no contacts

True

How many microns is shimstock?

A) 8 microns

B) 12 microns

C) 17 microns

D) 21 microns

B) 12 microns

How many microns is articulating paper?

A) 8 microns

B) 12 microns

C) 17 microns

D) 21 microns

D) 21 microns

What tool is used to measure the thickness of the occlusal surface?

Iwansson gauge (spring caliper)

What bur can be used to define grooves and fissures?

1/2 or 3/4 round

What can be used to shape ridges?

green/white stones

What must be done to rubber points periodically?

true

What is the material used to air abrade?

50 microns Al2O3

A 5 second blast of 50 microns Al2O3 at 500 kPa removes about ___ microns of metal

A) 10

B) 20

C) 30

D) 40

B) 20

What are tools that can be used to adjust zone 6 (axial walls)?

- medium grit discs

- shaped white flexie (low RPM and high pressure)

- Tripoli

- rouge

What is Tripoli?

silica and chert from Schistose rocks

True/False: you should use Tripoli at high RPM and intermittent pressure

True

True/False: rouge should be used with low RPM

False

Polishing with rouge with a soft brush removes about ___ microns from the surface

A) 1

B) 5

C) 10

D) 15

B) 5

True/False: polishing a metal crown limits plaque accumulation

True

True/False: the most efficient method of polishing is to use a progressive sequence of finer abrasives

True