Midterm II

Question 1

What are the principles of veneers?

Answer 1

1. Enamel in right places, 2. Esthetics/good margins and 3. Adequate reduction

Question 2

What is photopic vision?

Answer 2

Vision in the light - cones

Question 3

What is scotopic vision?

Answer 3

Vision in the dark - rods

Question 4

What is hue?

Answer 4

Color

Question 5

What is chroma?

Answer 5

Color intensity

Question 6

What is value?

Answer 6

Light/dark scale

Question 7

Where is the best location to figure out the patient’s hue?

Answer 7

Cervical third of the canine

Question 8

What does squinting do?

Answer 8

Blocks out everything but the highest value objects

Question 9

What type of porcelain is the most esthetic?

Answer 9

Fieldspathic

Question 10

What post design is the most retentive?

Answer 10

Parallel post

Question 11

What post design transfers the least stress to the dentin?

Answer 11

Parallel post

Question 12

What three things can be done with posts to decrease dentin stress?

Answer 12

1. make the post longer, 2. increase post thickness and 3. bond the post

Question 13

Why do we use tapered posts?

Answer 13

To conserve tooth structure

Question 14

What is the deal with cast post and core and parallel posts?

Answer 14

You can’t do them together

Question 15

What is a 6878K-012 used for?

Answer 15

Breaks proximal contacts, light veneer preps and chamfered points

Question 16

What is a 6877K-018 used for?

Answer 16

Heavy chamfer for limited access - shorter than 6878

Question 17

What is a 6878K-018 used for?

Answer 17

Chamfer, occlusal refinement, workhorse of prosth

Question 18

What is a 5856-016 used for?

Answer 18

Rounding shoulder margins, rounded tip, heavy usage

Question 19

What is a 6845KR-018 used for?

Answer 19

Partial coverage all ceramic

Question 20

What is a 6379-023 used for?

Answer 20

Football diamond, lingual concavities

Question 21

What is a 889-009 used for?

Answer 21

Tight spaces, small flame diamond

Question 22

What is a 8862-010 used for?

Answer 22

Interproximal, long flame diamond, bevels margins

Question 23

What is metamerism?

Answer 23

When light surrounding an object affects its perception by the human eye

Question 24

What are four weaknesses of the human eye to adequately judging color?

Answer 24

1. influence of surrounding colors, 2. color adaptation, 3. metamerism and 4. color blindness

Question 25

What two reasons could an object appear to be yellow?

Answer 25

1. It reflects yellow light or 2. It reflects a combination of light wavelengths that mixes together to appear yellow

Question 26

What makes chroma appear higher than it really is?

Answer 26

Proximity of close colors with vibrant chromas - especially complimentary colors

Question 27

What colors and Munsell level should be present in the op?

Answer 27

Pastel colors with a chroma no higher than 4 on walls, 9 on ceiling

Question 28

What is the best way to avoid color adaptation?

Answer 28

Look away at something gray or pastel to rest your eyes

Question 29

How does the Vita classic guide work?

Answer 29

It uses four categories of hues/chroma and then you detect value

Question 30

How does the Vita 3D system work?

Answer 30

You first find the value, then move on to hue/chroma

Question 31

What would not be a good reason to place veneers?

Answer 31

Minor shade changes - whitening should be tried first

Question 32

What is the ideal prep depth for the lab?

Answer 32

Heavy half - 0.5 -0.7 mm

Question 33

What is the primary reason to have a lingual chamfer?

Answer 33

To help seat the restoration and guide the veneer into a full seat

Question 34

How far is the lingual extent of the proximal axial reduction?

Answer 34

About 1/2 through the tooth

Question 35

As a general rule, if you are not preparing an adjacent tooth that is in the esthetic zone for veneer, what is a potential drawback/consequence of the tooth you are preparing?

Answer 35

You usually take more off at the margin

Question 36

What are the four things we need to know about placing veneers over restorations?

Answer 36

1. Excellent condition, 2. small in size, 3. Not discolored and 4. All classes except possibly class II

Question 37

Why do we trim the silicone putty guide?

Answer 37

To help with the prep and verify the seat

Question 38

Why is the veneer temporary technique so technique sensitive (3)?

Answer 38

1. Debris from cutting holes, 2. Leaving too long of sprues and 3. wetting typodont with vasoline

Question 39

How much gutta percha can be left when doing a post?

Answer 39

4-5 mm

Question 40

What is the ideal post length?

Answer 40

2/3 to 3/4 the length of the root

Question 41

For instance, if you increase the length of the post, does it decrease or increase the stress on the dentin?

Answer 41

Decreases

Question 42

What is the ideal gap between post and radicular dentin for the passively fitting post?

Answer 42

0.3 mm

Question 43

Do you ever use core material to cement your post with?

Answer 43

Yes, if the post is loose

Question 44

What is one cement that you do not want to use on posts?

Answer 44

Glass ionomers or RMGI's

Question 45

According to Schillenberg (one of the studies that he presented), he gave a guideline for buildups. His research indicated that what is the guideline for doing a buildup?

Answer 45

1/2 crown is missing

Question 46

Why is it that we try to keep the cavosurface margins on any ceramic restoration close to 90 degrees?

Answer 46

To create thick enough ceramic to avoid chipping