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D2 Fall - Fixed Prosth > 9/11: Crown Preparation > Flashcards

9/11: Crown Preparation Flashcards

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1
Q
  1. What are the parts of a crown preparation?
A

a. Axial wall
b. Interproximal wall
c. Finish line
d. Occlusal anatomy

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2
Q
  1. A full coverage restoration can survive in the biologic environment of the oral cavity only if
A

a. Margins are closely adapted to the surface finish line

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3
Q
  1. The design of what dictates the shape and bulk of restorative material in the marginal area of the restoration
A

a. Finish line

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4
Q
  1. What are the types of finish line designs?
A

a. Knife edge
b. Chamber: light and heavy
c. Shoulder
d. Beveled shoulder

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5
Q
  1. The knife edge is primarily used for what kind of crowns?
A

a. Metal specifically gold crowns

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6
Q
  1. What marginal design is the most conservative?
A

a. Knife edge

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7
Q
  1. What are the disadvantages of the knife edge?
A

a. Difficult to see finish line
b. Metal can be thin and susceptible to distortion
c. Overbulking of crown material

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8
Q
  1. What are the indications for a knife edge margin?
A

a. Generally not indicated
i. Maybe tipped molar

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9
Q
  1. When should you use a light chamfer?
A

Metal crowns
Zirconia crowns

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10
Q

When should you use a heavy chamfer?

A

Ceramic crowns
Zirconia crown
Metal-ceramic crowns

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11
Q
  1. What bur should you use to create a chamfer?
A

a. Round ended

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12
Q
  1. Light chamber is how deep into axial wall?
A

a. 0.3-0.5mm

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13
Q
  1. The light chamfer produces what degree of margin?
A

a. 30-45 degree

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14
Q
  1. What finish work for every material?
A

a. Heavy chamfer

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15
Q
  1. How deep is a heavy chamfer?
A

a. 1-1.2mm

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16
Q
  1. A shoulder creates what degree angle?
A

a. Close to 90 degrees

17
Q
  1. When should a shoulder be used?
A

a. Metal crowns
b. All ceramic crowns
c. Zirconia crowns

18
Q
  1. What finish is used for inlays and onlays?
A

a. Beveled shoulder

19
Q
  1. What can be used for a metal ceramic crown that has a metal collar?
A

a. Shoulder with bevel

20
Q
  1. This _______ finish line can prevent close adaptation of crown margin
A

a. Rough preparation

21
Q
  1. If you have recurrent decay on the margin, what could be a possible cause?
A

a. Roughened finish line

22
Q
  1. What is the disadvantage of the shoulder?
A

a. Marginal adaptation can be affected

23
Q
  1. What gives you the best finish line for a ceramic crown?
A

a. Heavy chamfer

24
Q
  1. A rise in pulp temperature by ___ degrees can significantly increase the chance of pulpal necrosis
A

a. 10 degrees

25
Q
  1. These burs remove enamel and dentin by grinding it away
A

Diamond burs

26
Q
  1. These burs remove tooth by shearing it away
A

a. Carbide burs

27
Q
  1. Are carbide or diamond burs more efficient?
A

a. Diamond by 2-3x

28
Q
  1. What is not a benefit of full metal crowns?
A

a. Esthetics

29
Q
  1. This is a newer material that is tooth-colored ceramic-like material
A

a. Zirconia

30
Q
  1. Zirconia is considered to be
A

a. Metal free

31
Q
  1. Zirconia is ___________ than natural tooth
A

a. Less translucent

32
Q
  1. The more aesthetic your zirconia is, the more
A

a. Reduction you need

D2 Fall - Fixed Prosth (6 decks)

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