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Fixed Prosthodontics > Midterm II > Flashcards

Midterm II Flashcards

1
Q

What are the principles of veneers?

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

What is photopic vision?

A

Vision in the light - cones

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3
Q

What is scotopic vision?

A

Vision in the dark - rods

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4
Q

What is hue?

A

Color

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5
Q

What is chroma?

A

Color intensity

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6
Q

What is value?

A

Light/dark scale

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7
Q

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

A

Cervical third of the canine

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8
Q

What does squinting do?

A

Blocks out everything but the highest value objects

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9
Q

What type of porcelain is the most esthetic?

A

Fieldspathic

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10
Q

What post design is the most retentive?

A

Parallel post

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11
Q

What post design transfers the least stress to the dentin?

A

Parallel post

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12
Q

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

A
  1. make the post longer, 2. increase post thickness and 3. bond the post
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13
Q

Why do we use tapered posts?

A

To conserve tooth structure

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14
Q

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

A

You can’t do them together

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15
Q

What is a 6878K-012 used for?

A

Breaks proximal contacts, light veneer preps and chamfered points

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16
Q

What is a 6877K-018 used for?

A

Heavy chamfer for limited access - shorter than 6878

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17
Q

What is a 6878K-018 used for?

A

Chamfer, occlusal refinement, workhorse of prosth

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18
Q

What is a 5856-016 used for?

A

Rounding shoulder margins, rounded tip, heavy usage

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19
Q

What is a 6845KR-018 used for?

A

Partial coverage all ceramic

20
Q

What is a 6379-023 used for?

A

Football diamond, lingual concavities

21
Q

What is a 889-009 used for?

A

Tight spaces, small flame diamond

22
Q

What is a 8862-010 used for?

A

Interproximal, long flame diamond, bevels margins

23
Q

What is metamerism?

A

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

24
Q

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

A
  1. influence of surrounding colors, 2. color adaptation, 3. metamerism and 4. color blindness
25
Q

What two reasons could an object appear to be yellow?

A
  1. It reflects yellow light or 2. It reflects a combination of light wavelengths that mixes together to appear yellow
26
Q

What makes chroma appear higher than it really is?

A

Proximity of close colors with vibrant chromas - especially complimentary colors

27
Q

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

A

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

28
Q

What is the best way to avoid color adaptation?

A

Look away at something gray or pastel to rest your eyes

29
Q

How does the Vita classic guide work?

A

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

30
Q

How does the Vita 3D system work?

A

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

31
Q

What would not be a good reason to place veneers?

A

Minor shade changes - whitening should be tried first

32
Q

What is the ideal prep depth for the lab?

A

Heavy half - 0.5 -0.7 mm

33
Q

What is the primary reason to have a lingual chamfer?

A

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

34
Q

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

A

About 1/2 through the tooth

35
Q

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?

A

You usually take more off at the margin

36
Q

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

A
  1. Excellent condition, 2. small in size, 3. Not discolored and 4. All classes except possibly class II
37
Q

Why do we trim the silicone putty guide?

A

To help with the prep and verify the seat

38
Q

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

A
  1. Debris from cutting holes, 2. Leaving too long of sprues and 3. wetting typodont with vasoline
39
Q

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

A

4-5 mm

40
Q

What is the ideal post length?

A

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

41
Q

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

A

Decreases

42
Q

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

A

0.3 mm

43
Q

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

A

Yes, if the post is loose

44
Q

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

A

Glass ionomers or RMGI’s

45
Q

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?

A

1/2 crown is missing

46
Q

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

A

To create thick enough ceramic to avoid chipping

Fixed Prosthodontics (5 decks)

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