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Fixed Prosthodontics > Final winter > Flashcards

Final winter Flashcards

0
Q

Benefits of crown lengthening

A

Increases ferrule size for resistance and retention

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1
Q

Five advantages of a partial veneer crown over a complete veneer crown

A 
Less hydraulic pressure when seating
Leaves tooth structure in case future pulp testing is needed
Conserves tooth structure
Easier to access margins
Less margin near the gingiva
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2
Q

Benefit of a bone graft

A

Increases support for future restorations

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3
Q

Benefits of a soft tissue graft

A

Increases esthetics

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4
Q

Two requirements of solder

A

Lower melting temp than parent metal

Good wettability

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5
Q

What does soldering flux do?

A

Reduces contaminants from oxidation

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6
Q

The most esthetic Pontic in the maxilla

A

Ovate

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7
Q

Four requirements of a Pontic

A

Restore function of the tooth it replaces
Cleans ability
Esthetics and comfort
Must not injure tissue

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8
Q

What is a nonrigid Pontic connector used for?

A

When abutment teeth have different POI

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9
Q

Which Pontic design may require tissue modification to look good?

A

Ovate

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10
Q

Two parts of a nonrigid connector

A

Matrix and patrix

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11
Q

Two factors necessary to the success of a pontic

A

Biocompatibility and mechanical strength

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12
Q

What is the role of a post when used to restore a root canal treated tooth?

A

To support the core, which supports the crown

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13
Q

3 disadvantages of cementing a post into a RCT tooth that doesn’t need a core or crown

A

Removal of tooth structure
Complicates future RCT
Increases chances of root breakage

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14
Q

What kind of post do you need for a tooth with an ovoid or irregular root canal?

A

Custom

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15
Q

What is meant by an active post?

A

It is threaded like a screw

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16
Q

2 advantages of using a longer post vs a shorter one

A

Longer = more retention

Less likely that the root will crack

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17
Q

Two things the ferrule does for your restored tooth

A

Increases resistance

Increases fracture resistance

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18
Q

Two potential problems associated with using a parapost twist drill to remove gutty percha.

A

May dig into dentin and undermine it

May perforate the root

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19
Q

3 advantages of using the indirect method to make provisionals

A

Less exposure to heat
Less exposure to potential antigens
Easier to get good margins

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20
Q

What should be overcontoured in a provisional multi unit FPD?

A

The connectors

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21
Q

Which reinforcement for provisional FPD had the highest stiffness?

A

V shaped wire

22
Q

Which tooth in the hazleton experiment lost cement seal first?

A

The premolar

23
Q

Which material withstood the highest number of load cycles in the hazleton study?

A

Luxatemp hybrid composite

24
Q

Four types of pins

A

Cast, cemented, friction grip, threaded

25
Q

How deep to set pins?

A

2-3 mm

26
Q

How far above the surface should the pins go?

A

2mm

27
Q

What tool carries impression material into the canal for a custom post?

A

Lentulo spiral

28
Q

3 important properties for a post to have

A

Stiffness
Strength
Corrosion resistance

29
Q

Which post is not recommended for patients with bruxism?

A

Zirconia- too stiff, can crack the root

30
Q

Disadvantages of zirconia post system(3)

A

Hard to remove
Hard to etch
Very stiff

31
Q

When to use composite core material

A

Under CCC

32
Q

When to use cast alloy for a core

A

When little tooth structure remains, or the tooth will be under heavy occlusal loads

33
Q

When to use a ceramic core

A

When esthetics is an issue

34
Q

What kind of core should not be used with zirconia posts?

A

Composite- poor bonding

35
Q

What two core materials can be heat pressed onto a zirconia post?

A

Zirconia and ceramic

36
Q

What is a zirconia post’s one weakness?

A

Never grind grooves into it

37
Q

Why would you want to use a parapost/para core system?

A

For esthetic purposes

38
Q

Indications for a partial veneer crown (2)

A

The tooth has an intact buccal surface and needs a cast restoration
As a retainer for a short bridge

39
Q

Contraindications for a partial veneer crown (3)

A

Maximum retention required
No metal display desired
Restoration already on buccal surface

40
Q

Occlusal clearance needed on a partial veneer crown

A

1.5mm

41
Q

Location of the functional cusp bevel on a mandibular partial veneer crown

A

1.5mm south of the centric contact

42
Q

Shoulder width on a partial veneer crown

A

.7mm

43
Q

Width of the facial shoulder in a mandibular partial veneer crown

A

.7mm

44
Q

What disaster do the grooves on a partial veneer crown prevent ?

A

The crown slipping off lingually

45
Q

Exit angle for the proximal flare on a partial veneer crown

A

110*

46
Q

What is involved with the treatment planning phase (3)

A

Establish diagnosis
Set objectives
Establish treatment sequence

47
Q

Which ASA classification may require medical consult?

A

ASA 2

48
Q

During which phase of treatment planning do you measure edentulous spaces?

A

Treatment planning stage

49
Q

Describe the pre-prosthetic phase of treatment planning

A

Stop active disease
Move teeth
Rebuild gingival architecture

50
Q

Which way do the dislodging forces work on a fixed partial denture?

A

Mesio-distally

51
Q

Which direction do dislodging forces work on a single restoration?

A

Bucco-lingually

52
Q

Where can you use a cantilever bridge?

A

Lateral maxillary incisor with no function

First premolar where both 2nd premolar and 1st molar are abutments

53
Q

Minimum ferrule length

A

2mm

Fixed Prosthodontics (1 decks)

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