Fixed Prosth and Prep

Question 1

For a prep for zirconia and gold, what type of prep should be performed?

Answer 1

Shoulder prep

Question 2

For a prep for zirconia and gold, what should the axial angle be?

Answer 2

4 degrees

Question 3

For a prep for zirconia and gold, what should the axial depth be?

Answer 3

1 mm

Question 4

For a prep for zirconia and gold, what should the occlusal/incisal depth be?

Answer 4

1.5-2mm

Question 5

For a prep for zirconia and gold, what should the lingual depth be?

Answer 5

as little as 0.5

Question 6

For a prep for zirconia and gold, how much depth is taken off functional cusp?

Answer 6

1.5 mm

Question 7

For a prep for zirconia and gold, how much depth is taken off non-functional cusp?

Answer 7

1.0 mm

Question 8

The scope of _____ includes: Restoration of a single tooth or rehabilitation of entire occlusion•Improve patient’s comfort and masticatory ability•Maintain health and integrity of dental arches•Elevate patient’s self-image by restoring dento-facial harmony

Answer 8

Fixed prosth

Question 9

Which material used in fixed prosth is a crystalline structure that is 100% dense, has a tetragonal base, and extremely fine grain size that yields high strength?

Answer 9

Zirconia

Question 10

What aids us in evaluation of tooth structure removal, and when complete, can help us make a provisional restoration

Answer 10

vacuum formed matrix

Question 11

What size is the plastic sheet used to make the vacuum formed matrix

Answer 11

.020 mm

Question 12

You want to cut down the vacuum matrix to which teeth?

Answer 12

One mesial to one distal of the tooth being worked on

Question 13

Do you trim the vacuum matrix at the free gingival margin?

Answer 13

No

Question 14

How far gingival do you want to trim the matrix?

Answer 14

5-6mm

Question 15

What is used to make a putty matrix to evaluate the tooth structure reduction?

Answer 15

PVS

Question 16

Where do you cut the PVS putty matrix?

Answer 16

In the center of the tooth being prepped

Question 17

What kind of burs are used for crown preps?

Answer 17

Diamond

Question 18

Which diamond bur is wider? 3.14.021 or 3.14.016

Answer 18

.021

Question 19

What does the green stripe on diamond bur mean?

Answer 19

Course

Question 20

What does the red stripe on diamond bur mean?

Answer 20

Fine

Question 21

Where should a groove be placed on the crown prep?

Answer 21

Facial

Question 22

____ form resists movement in the lateral direction

Answer 22

Resistance form

Question 23

_____ form resists removal of the crown itself

Answer 23

Retention form

Question 24

Prevents restoration removal along the path of insertion or the long axis of the tooth preparation.•Resists sticky foods.

Answer 24

Retention

Question 25

Prevents restoration dislodgement by apical or oblique forces.•Occlusal forces.

Answer 25

Resistance

Question 26

The angle of convergence formed between 2 opposing prepared axial surfaces.

Answer 26

Total Occlusal Convergence (Taper)

Question 27

What is the ideal total occlusal convergence?

Answer 27

6-10 degrees

Question 28

What is the clinically acceptable total occlusal convergence?

Answer 28

10-20 degrees

Question 29

Does an increase in length increase or decrease resistance?

Answer 29

Increases resistance

Question 30

Does an decrease in length increase or decrease resistance?

Answer 30

Decreases resistance

Question 31

An increase in ____ produces a lock to resist lateral forces and movement

Answer 31

Height

Question 32

As the preparation ____ is increased the retention and resistance is increased.

Answer 32

length

Question 33

For every 1 mm increase in preparation length, the retention and resistance form increases up to ____.

Answer 33

10%

Question 34

The shorter the preparation, the ____ the taper must be.

Answer 34

lesser

Question 35

The longer the preparation, the ____ the taper maybe.

Answer 35

greater

Question 36

Is the arc or rotation larger for wider or narrower teeth?

Answer 36

Wider

Question 37

Do wider or narrower teeth need to be more parallel to resist lateral forces/movement?

Answer 37

Wider

Question 38

What is the minimum height that an incisor and premolar prep can be?

Answer 38

3 mm

Question 39

What is the minimum height a molar can be?

Answer 39

4 mm

Question 40

Thickness of partial veneer crowns (using high lucite porcelain) should have at least a thickness of _____ mm in stress bearing areas.

Answer 40

1.5-2.0 mm

Question 41

_____ is explained by: retention is increased by limiting the number of paths along which a restoration can be removed from tooth preparation

Answer 41

Freedom of Displacement

Question 42

Adding grooves limits the path of withdrawal to only 1 path which achieves _____ retention (greater or lesser)

Answer 42

Greater

Question 43

What bur should be used to do the occlusal reduction?

Answer 43

.016 diamond (1mm)

Question 44

At what angle should the .016 diamond bur be held to get the functional cusp bevel?

Answer 44

45 degree

Question 45

The ____ line is a line that goes around the tooth that is about 0.3-0.5 mm; easy to form, adequately distinct, adequate bulk for rigidity, adequate depth for normal contours in an all-metal crown

Answer 45

Chamfer Finish line

Question 46

To form the _____ , select a diamond that is 2x the desired depth (.3-.5mm) and place the rotating instrument into the tooth to 1/2 is diameter and move the instrument around tooth

Answer 46

Chamfer finish line

Question 47

Place the bur in the _____ to determine the proper path to perform the axial reduction

Answer 47

Center of occlusal plane

Question 48

What bur should you use for the axial reduction?

Answer 48

.021

Question 49

A slight _____ avoids abrading adjacent teeth on the proximal reductions

Answer 49

Over tapering

Question 50

Which bur should be used for the proximal reduction?

Answer 50

.016

Question 51

What bur should be used to smooth the corners of prep?

Answer 51

Red stripe football diamond

Question 52

____ is a principle of tooth prep that includes the chamfer line, more conservative so that less tooth is removed, shoulder line, modified shoulder; feather-knife edge

Answer 52

Marginal geometry

Question 53

Should porcelain or gold fill the crevice?

Answer 53

No

Question 54

____ is a marginal geometery principle that is used in metal ceramic margins and some all-ceramic crowns that is flat

Answer 54

Shoulder

Question 55

____ is a marginal geometry principle Used primarily for porcelain fused to metal crowns; flatten with a hand instrument

Answer 55

Modified Shoulder

Question 56

What is the marginal geometry principle that is contra-indicated? Causes overbulking

Answer 56

Feather/Knife edge

Question 57

_____ features include limiting the path of withdrawal and shortening the rotational radius

Answer 57

Secondary features

Question 58

_____ reduction like a functional cusp bevel provides Adequate occlusal/incisal clearance without excessive removal of tooth structure.•Anti-rotational effects for increased resistance. •Uniform restoration thickness.•Adequate room to reproduce physiologic contours and functional anatomy.•Adequate room for esthetics.

Answer 58

Morphologic reduction

Question 59

Direct evaluation of parallelism and path of draw is done with what instrument?

Answer 59

Handpiece

Question 60

Visual evaluation of parallelism and path of draw is done with what instrument?

Answer 60

Mouth mirror

Question 61

The article shows evidence that crowns with grooves in the ____ axial walls show the greatest resistance form?

Answer 61

Proximal walls