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D2: 623 Fixed Pros > 03: All Metal Crown Prep #30 > Flashcards

03: All Metal Crown Prep #30 Flashcards

1
Q

What is the dimension of the Chamfer margin

A

0.5 mm

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2
Q

What is the depth of the Secondary Retention groove

A

Full depth of 170L bur

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3
Q

What is the dimension of the axial reduction?

A

0.5-1.0 mm

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4
Q

What is the dimension of the functional cusp bevel

A

1.5 mm tapers to 1.0 mm

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5
Q

What are the two types of morphologic occlusal reductions

A

Functional areas and non-functional areas

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6
Q

What is the dimension of the functional occlusal reduction

A

1.5 mm

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7
Q

What is the dimension of the non-functional occlusal reduction

A

1.0 mm

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8
Q

What steps should be taken before beginning?

A

Fabricate putty preparation

Reduction guide

Matrix

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9
Q

After getting the putty impression, what is the next step?

A

Identify M & D cusp tips prior to sectioning

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10
Q

After the putty preparation is sectioned, what else should be done before beginning preparation?

A

Verify and equilibrate articulation of dentoform

Evaluate occlusal contacts

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11
Q

What is the proper sequence for the all metal crown prep?

A 
Occlusal Reduction
  functional cusp bevel
Axial reduction
Proximal reduction
Secondary retention
  if needed
Margination
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12
Q

What is Step 1 of the procedure

A

Occlusal reduction

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13
Q

What is true about the depth cuts of the occlusal reduction?

A

They typically follow the inclines of the tooth

Consider the planned restoration

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14
Q

For all metal crowns, what is the required clearance on functional areas?

A

1.5 mm clearance

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15
Q

What structures are considered functional areas?

A

Functional cusps
Central Groove
Functional inclines of Non-Functional cusps

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16
Q

How wide is the tapered diamond bur at the tip?

A

1.2 mm

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17
Q

What is Step 2 of the procedure?

A

Functional Cusp Bevel

18
Q

What type of bur is used for the functional cusp bevel?

A

Round-end, course tapered diamond

19
Q

What are three facts of the functional cusp bevel?

A

It completes the occlusal reduction

It re-aligns the functional cusps with the opposing central groove

It provides for a uniform 1.5 mm functional occlusal clearance

20
Q

At what angle, relative to the long axis, is the bevel made?

A

45 degrees

21
Q

What is Step 3 of the procedure?

A

Facial and Lingual Axial Reduction

22
Q

What type of bur is used for the axial reduction?

A

Round-end taper diamond

Small chamfer tapered diamond

23
Q

For all metal crowns, what is the adequate dimension of axial reduction?

A

0.5 - 1.0 mm

24
Q

What two surfaces should be parallel?

A

Facio-lingual

Mesio-lingual

25
Q

When should the path of draw be determined?

A

Prior to starting the axial wall preparation

26
Q

What is the ideal taper TOC of opposing walls

A

6-10

27
Q

What might be present in an INADEQUATE Axial Wall Reduction

A

Finish line not definite
Restoration will lack bulk needed for strength
May cause over-contoured restoration

28
Q

What is Step 4 of the Procedure?

A

Proximal axial reduction

29
Q

What burs are used for the Proximal axial reduction?

A

Needle chamfer diamong

Small chamfer diamond

30
Q

Why is a TOC of up to 15 degrees allowed for the proximal axial reduction?

A

To avoid damage to the adjacent teeth

31
Q

What is Step 5 of the Preparation?

A

Margination

32
Q

What bur is used for margination?

A

Small chamfer tapered diamond

33
Q

What is the dimension of the finish line chamfer?

A

0.5 mm light chamfer

34
Q

What is a good way to estimate 0.5 mm?

A

1/2 the diameter of the small chamfer diamond bur

35
Q

What qualities does a good chamfer posess?

A

Smooth
Continuous
Well-defined

36
Q

What is Step 6 of the procedure?

A 
Finishing
  Verify occlusal clearance
  Verify morphologic reduction
  Round occlusal-axial line angles
  Verify the draw
37
Q

How do you verify the occlusal clearance?

A

Measure clearance with ball burnisher or other pre-measured instrument

Measure regisil placed b/w the prep and the opposing dentition

Measure putty matrix with perio probe

Measure the occlusal thickness of the provisional

38
Q

What is the quality of a Rounded Occlusal-Axial line angle

A

Smooth preparation transitions

39
Q

What bur is used to round the occlusal-axial line angles?

A

Small chamfer bur

40
Q

What instruments are used to evaluate Parallelism and Path of Draw?

A

Direct: Handpiece

Visual: Mirror

D2: 623 Fixed Pros (8 decks)

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