03: All Metal Crown Prep #30

Question 1

What is the dimension of the Chamfer margin

Answer 1

0.5 mm

Question 2

What is the depth of the Secondary Retention groove

Answer 2

Full depth of 170L bur

Question 3

What is the dimension of the axial reduction?

Answer 3

0.5-1.0 mm

Question 4

What is the dimension of the functional cusp bevel

Answer 4

1.5 mm tapers to 1.0 mm

Question 5

What are the two types of morphologic occlusal reductions

Answer 5

Functional areas and non-functional areas

Question 6

What is the dimension of the functional occlusal reduction

Answer 6

1.5 mm

Question 7

What is the dimension of the non-functional occlusal reduction

Answer 7

1.0 mm

Question 8

What steps should be taken before beginning?

Answer 8

Fabricate putty preparation

Reduction guide

Matrix

Question 9

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

Answer 9

Identify M & D cusp tips prior to sectioning

Question 10

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

Answer 10

Verify and equilibrate articulation of dentoform

Evaluate occlusal contacts

Question 11

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

Answer 11

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

Question 12

What is Step 1 of the procedure

Answer 12

Occlusal reduction

Question 13

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

Answer 13

They typically follow the inclines of the tooth

Consider the planned restoration

Question 14

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

Answer 14

1.5 mm clearance

Question 15

What structures are considered functional areas?

Answer 15

Functional cusps
Central Groove
Functional inclines of Non-Functional cusps

Question 16

How wide is the tapered diamond bur at the tip?

Answer 16

1.2 mm

Question 17

What is Step 2 of the procedure?

Answer 17

Functional Cusp Bevel

Question 18

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

Answer 18

Round-end, course tapered diamond

Question 19

What are three facts of the functional cusp bevel?

Answer 19

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

Question 20

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

Answer 20

45 degrees

Question 21

What is Step 3 of the procedure?

Answer 21

Facial and Lingual Axial Reduction

Question 22

What type of bur is used for the axial reduction?

Answer 22

Round-end taper diamond

Small chamfer tapered diamond

Question 23

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

Answer 23

0.5 - 1.0 mm

Question 24

What two surfaces should be parallel?

Answer 24

Facio-lingual

Mesio-lingual

Question 25

When should the path of draw be determined?

Answer 25

Prior to starting the axial wall preparation

Question 26

What is the ideal taper TOC of opposing walls

Answer 26

6-10

Question 27

What might be present in an INADEQUATE Axial Wall Reduction

Answer 27

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

Question 28

What is Step 4 of the Procedure?

Answer 28

Proximal axial reduction

Question 29

What burs are used for the Proximal axial reduction?

Answer 29

Needle chamfer diamong Small chamfer diamond

Question 30

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

Answer 30

To avoid damage to the adjacent teeth

Question 31

What is Step 5 of the Preparation?

Answer 31

Margination

Question 32

What bur is used for margination?

Answer 32

Small chamfer tapered diamond

Question 33

What is the dimension of the finish line chamfer?

Answer 33

0.5 mm light chamfer

Question 34

What is a good way to estimate 0.5 mm?

Answer 34

1/2 the diameter of the small chamfer diamond bur

Question 35

What qualities does a good chamfer posess?

Answer 35

Smooth Continuous Well-defined

Question 36

What is Step 6 of the procedure?

Answer 36

``` Finishing Verify occlusal clearance Verify morphologic reduction Round occlusal-axial line angles Verify the draw ```

Question 37

How do you verify the occlusal clearance?

Answer 37

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

Question 38

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

Answer 38

Smooth preparation transitions

Question 39

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

Answer 39

Small chamfer bur

Question 40

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

Answer 40

Direct: Handpiece Visual: Mirror