Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Module 6 Exam > Fixed and removable pros > Flashcards

Fixed and removable pros Flashcards

1
Q

What fractures to a tooth would make it unrestorable with a crown?

A

Fractures that extend past the ACJ

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are the indications for a crown?

A

F - Minimise risk of tooth fracture
R - Repeated failure (of direct restoration)
A - Aesthetics
N- New crown to replace an existing crown
D - Difficulty achieving contact/occlusion w direct rest
P - For aiding removable/permanent pros (dentures/bridge abutment)

“FRANDP”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Biological width

A

~2-3mm

From junctional epithelium (where the gingival becomes attached) and connective tissue attachment to root surface of the tooth.

If this is encroached due to large crowns being made it can cause failure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When should you NOT use a crown?

A

Poor OH
Active disease (caries or periodontal disease)
Inadequate crown height
Inadequate access for tooth preparation or impression taking
When there is a more minimally invasive option

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

How many vital teeth prepared for crowns subsequently need root canal therapy?

A

20%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Cores: amalgam

A

Pros: easy, cheap, differentiates from natural tooth well, packable (no voids)

Cons: long setting time, weak in thin sections, mercury?, electrolytic action, not adhesive

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Cores: composite

A

Pros: strong in thin section, tooth coloured, light curable (so immediate setting)

Cons: moisture control, hard to distinguish

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Self threading pins

A

Not commonly used, ss pins in the dentine used to aid retention for core materials etc.

Makes the core more at risk of fracture

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Panavia

A

RMGI adhesive luting cement (active)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

NAYYAR core

A

3-4mm of canal filled with amalgam/composite above the RCT, makes a successful “NAYYAR” core - this avoids use of post.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Would you use a post in a posterior tooth?

A

No. Roots often curved. Root fracture likely as they do not reinforce the roots.

Use NAYYAR core instead.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What bur is used to prep canals for posts?

A

Blunt non-cutting tip burs (Gates-Gliddens)

Work up in size —> cuts laterally not vertically.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Describe the preparation for a post

A

Blue section = post
White section = core
Red section = GP
Light yellow = crown

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Ferrule preparation

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Active vs Passive posts

A

Active = mechanical retention

Passive = relies on frictional/cementation etc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the most important feature of a post?

A

Length

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Most commonly used post system

A

ParaPost is parallel serrated post fibre reinforced.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What else can cuspal coverage restorations offer beneficially apart from preserving the integrity of a weakened tooth?

A

Correct occlusal discrepancies and aid reorganisation of the occlusal scheme

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

EBD: crowning RCTs?

A

Non-crowned after RCT were lost six times faster than crowned RCTs.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Hydrophilic impression materials

A

Alginate (irreversible) and agar (reversible)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Hydrophobic impression materials

A

Silicones
Polysulphides (smelly not used)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What impression material is commonly used for indirect restorations and why?

A

Silicone (addition polymerisation reaction)
in DDH use Affinis.

hydrophilic properties means this won’t recoil from the detailed areas (gingival crevicular fluid)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Why is retraction cord useful for impression taking

A

Absorbs moisture and displaces soft tissue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Preformed crown

A

Polycarbonate - pre-made sizes —> trim to fit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

How many remaining occlusal units are required to allow for sufficient adaptive capacity?

A

four occlusal units

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

The Rochette bridge

A

A type of dental bridge that uses perforated metal wings (retainers) bonded to the adjacent teeth with composite resin. The perforations in the wings enhance the retention by allowing the resin to flow through and create a mechanical lock.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

The maryland bridge

A

A dental prosthesis consisting of a false tooth (pontic) with metal or porcelain wings on either side that are bonded to the back of the adjacent teeth (abutments) using a strong dental resin.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

Cantilever design

A

Replacement of one tooth, crowning the other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

Fixed-fixed bridge

A

Replacement of multiple teeth in an arch, crowning two teeth either side

30
Q

Fixed-moveable

A

Allows for two paths of insertion

Major retainer (is attached to the pontic rigidly), the minor retainer is the movable part.

31
Q

Conventional bridges: abutment

A

the prepared tooth to which the bridge fits onto

32
Q

Conventional bridges: retainer

A

The indirect restoration for the abutment

33
Q

Conventional bridges: connector

A

Part of the bridge which connects the retiner to the pontic

34
Q

Conventional bridges: pontic and the saddle

A

pontic - prosthetic tooth/teeth
saddle - alveolar ridge after tooth loss

35
Q

What are some requirements for a cantilever bridge?

A

There cannot be any excursive loading onto the pontic, pontic usually sits mesial to the retainer, can only fabricate one missing tooth.

36
Q

Which bridge is durable for the longest?

A

fixed-fixed

37
Q

spring cantilever bridge

A

For replacement of an anterior tooth where the anterior teeth are very spaced apart

38
Q

Complex bridgework

A

Where there is a combination of multiple designs to fit complex situations

39
Q

Pier abutment

A

Tooth with pontics either side (generally avoided as can act as a pivot)

40
Q

Pontic design

A

Modified ridge lap (or any variation that involves relief of the gingiva to allow cleaning underneath)

41
Q

RRBs: how is the metal retainer bonded to the palatal surface of the tooth?

A

Sandblasted with alumina particles (50um)

Enamel etched

Panavia resin then used to bond both chemically and micromechanically

42
Q

RRBs: what preparation is required of the tooth?

A

Ideally preparation to the tooth should not be done unless the path of insertion is a problem.

At DDH —> cingulum rest is created for location/occlusal rests if posterior tooth + removal of undercuts

43
Q

Why might a ridge with teeth opposing an edentulous ridge be problematic?

A

Lack of stability of the opposing denture
Trauma and resorption of the ridge
Inability to achieve balanced occlusion
Flabby/fibrous ridge

44
Q

Taking an impression of flabby ridge

A

Special tray with perforations
Mucostatic impressive (relaxed)
Two stage impression with putty and then use light bodied putty

45
Q

Combination syndrome recommendations

A

Good in this situation to include a lower denture to address this instability

46
Q

When may you consider extracting teeth?

A

Overerupted –> theres not space for them!

47
Q

Overlay appliances/overdenture benefits

A

YOU’RE KEEPING THE TEETH!
alveolar bone isn’t being lost
helps balance occlusion

48
Q

Natural upper teeth, no lower teeth

A

Implants in the lower, retaining roots and provide over denture, soft lining

49
Q

Reline vs rebase

A

Rebase - WHOLE thing entire fit surface

Reline - chair side, partial surface

50
Q

Temporary reline material uses (tissue conditioner)

A

Inflamed ridge, gives a soft ridge allowing tissues to heal

Useful in immediate dentures or after implant surgery

example - “COE-COMFORT”

51
Q

Soft relines uses

A

Bruxism, atrophic ridges

Placticisers leach, candida infections

52
Q

Soft lining examples

A

Heat cured acrylics
Self cured acrylics
Heat cured silicones - molloplast B!
Self cured silicone

53
Q

Permanent reline uses

A

Peripheral seal issues, fit isn’t very good, post immediate dentures, prolongs life span of some older dentures

54
Q

Rebase stages

A
  1. Remove undercuts from the denture
  2. Wash impression (closed mouth - to keep the occlusion the same)
  3. Cast in stone (carve post-dam)
  4. Plaster overcast (keeps occlusion the same)
  5. Cut away the palate (horse shoe)
  6. Wax up and replace with PMMA
55
Q

Repair examples

A
  1. Two pieces fit together; no impression needed –> send to lab
  2. Missing pieces; insert remaining pieces into mouth and take an impression
  3. PMMA broken off CoCr; add retentive tags/ solder? only really temporary repairs
56
Q

Additions

A

Only to partials
Tooth, clasps

57
Q

Immediate addition

A

Tooth is added onto the denture
Send impression before XLA to lab

58
Q

Post-immediate addition

A

Pt returns after XLA

Take impression with denture in mouth

59
Q

Retention addition

A

Take impression with denture in mouth

These will be stainless steel Not CoCr

60
Q

Easier to add onto a___ denture than a ____

A

Easier to add onto a PMMA denture than a CoCr denture.

61
Q

Overdenture

A

Any denture over natural teeth, roots or even dental implants

62
Q

Which patients can benefit particular from over dentures?

A

MRONJ and radiotherapy benefits

  • these pts are contraindicated for XLA so useful in these situations
63
Q

Precision attachments in over dentures

A

Metal component female, resin fibre component male. (poppy buttons vibes)

64
Q

Immediate replacement dentures considerations

A

Denture will become loose and then need a new one (2 dentures in total! this is only temporary)

Not ideal for surgical XLA

65
Q

part flange design

A
66
Q

Open face flange design

A
67
Q

Bulk upper anterior alveolar ridge with an undercut management

A

Consider an open face flange/partial design to avoid a design that acts as a food trap

68
Q

Aftercare for Immediate replacements

A

Keep them in 24hrs, ideally overnight

Ideally review the next day (or within a few days); check for areas of healing and inflammation.

Remove dentures after meals and salty mouth wash.

Consider temporary reline 1 month?

69
Q

One step immediate denture design

A

Modified spoon denture (temporary!!!)

70
Q

Clinical stages for immediate denture design

A

SAME AS for normal partial dentures.

But lab will remove the stone teeth to make the full denture (lab instructions clear)

71
Q
A

Module 6 Exam (10 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions