Brainscape's Knowledge GenomeTM

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


See full index

BDS Exam style questions > Prosthodontics > Flashcards

Prosthodontics Flashcards

1
Q

What does RPI stand for?

A

R- Mesial Rest

P- Proximal guide plate

I- Gingival approaching I Bar clasp

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

What is the mechanism of action for an RPI?

A

On loading- clasp and proximal plate disengage
-> Clasp moved down and forward
-> Place moves into undercut

Relieves pressure/traumatic torque

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

What radiographic views can be used to asses position of an unerupted tooth?

A

OPT and occlusal- vertical parallax

2 PA- horizontal parallax

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

What complications can arise when extracting unerupted premolar tooth in very resorbed denture bearing area in a patient with OP?

A

MRONJ- if patient on bisphosphonates

Nerve damage

Jaw fracture

Pain, bleeding, bruising, swelling, infection, dry socket

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

When are the aspects to consider when designing a replacement complete lower denture, with partially erupted tooth to be kept in situ?

A

Extension

Support and stability

Retention

Occlusion- FWS, OVD, RVD, occlusal and incisal planes

Comfort- relief around partially erupted tooth, soft lining

Appearance- tooth shape, shade, mould

Speech- ensure patient can speak

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

What measurements are required for a lingual bar?

A

8mm in total
-> 3mm below gingival margin, 4mm height of bar, 1mm clearance to functional floor of mouth

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

What is the method of producing a new denture of the same spec?

A

Replica method

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

How can a loose denture be adjusted?

A

Reline- soft and hard

Rebase

Remake

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

What should you check at the try-in stage?

A

LIMBO

ESROCAS

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

What is retention?

A

Resistance to vertical displacement

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

What is stability?

A

Resistance to lateral displacement

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

How are upper complete dentures retained?

A

Muscular

Extension into sulcus

Adhesion and cohesion

Post dam

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

What is biometric guidance when setting upper and lower teeth?

A

Aim to place teeth in pre extraction sites

Maxillary teeth placed buccally to the ridge promotes lower denture stability

Mandibular teeth placed over the ridge
-> palatal cusps of uppers occlude with fossa of lowers
-> forces are appropriately directed
-> reduces tongue restriction

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

What are the aetiological factors involved in Denture stomatitis?

A

Poor denture hygiene

Dentures worn at night

Immunocompromised patient- diabetes

Deficiency

Old dentures

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

How is Denture stomatitis managed?

A

Take denture out at night

Clean denture with a soft brush

Steep denture- Milton (3 x 30 mins per week- not chrome)

Chlorhexidine mouthwash

Use of nystatin or fluconazole
Consider making new denture

Consider deficiency/disease that may be underlying- diabetes or haematinic deficiency

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

How do you restore FWS in very worn dentures?

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

What issue is caused by complete upper denture occluding against partial lower?

A

Combination syndrome- results in flabby ridge

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

What occurs in combination syndrome?

A

Bone loss from the anterior part of the maxillary ridge

Hypertrophy of the tuberosities

Papillary hyperplasia in the hard palate

Extrusion of the mandibular anterior teeth
-> Bone loss under the opposing denture base

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

How is flabby ridge managed?

A

Mucostatic impression technique

Removing fibrous tissue- less denture bearing area

Implant retained denture

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

What is Kennedy classification 2 modification 1?

A

Unilateral free end saddle with additional bounded saddle

21
Q

What are the steps in the system of design used in designing partial dentures?

A
  1. Saddles
  2. Support
  3. Retention
  4. Bracing/reciprocation
  5. Connectors
  6. Indirect retention
  7. Simplification
22
Q

What are the advantages and disadvantages of upper horseshoe connector?

A

ADV
* Wider so can be thinner
* Comfort- less edges
* Doesn’t cover any more gingival margins than full coverage

DIS
* Not as rigid

23
Q

What are the ADV/DIS of upper ring connectors?

A

ADV
* Palate free for sensation
* Strong
* Posterior bar can act as main connector allowing anterior to be thinner

DIS
* More edges
* Difficult impression
* Less support for FES

24
Q

What are the ADV/DIS of lingual plates?

A

ADV
* Thinner
* Provides indirect retention

DIS
* Covers gingival margin and cingulum

25
Q

What are the ADV/DIS of lingual bar connectors?

A

ADV
* Less noticeable
* Doesn’t cover margin

DIS
* week if long span
* not great for FES
* Difficult to obtain functional impression
* Requires 8mm clearance

26
Q

What is support?

A

Resistance to occlusal directed load

27
Q

What is indirect retention?

A

Resistance to rotational displacement
-> place components on both sides of axis of rotation
-> good for FES/long bounded saddles

28
Q

What are the Cawood and Howell’s ridge classifications?

A
  1. Dentate
  2. Post extraction
  3. Broad alveolar process
  4. Knife edge
  5. Flat ridge (no alveolar process)
  6. Submerged/ inverted ridge (loss of basal bone)
29
Q

What is a knife edge ridge?

A

Ridge with adequate height but not width

30
Q

What are the causes of a Knife edge ridge?

A

Faster resorption at buccal and lingual aspects of ridge

31
Q

How is a knife edge ridge managed?

A

Take flap and smooth edge

32
Q

What is the difference between a soft-lining and tissue conditioner?

A

Soft linings are used for:
* Parafunctional habits
* If ridges very atrophic
* On obturators in cancer and cleft patients
-> good for sensitive naso-pharngeal tissues

Tissue conditioners are used:
* if grossly ill-fitting dentures
* for reducing inflammation in denture bearing area to aid healing

33
Q

What is a functional impression?

A

Mucompressive impression
-> denture bearing area is loaded produce uniform reduction in volume which will be compressed during denture wearing
-> uses high viscosity material like compound

34
Q

How can retention of dentures be improved?

A

Reline

Rebase

Implant retained

Precision attachments in tooth supported dentures

35
Q

How is retention checked clinically?

A

Pull on anterior teeth, canines and premolars

36
Q

What are the steps in making a Replica Denture?

A

Stage 1
1. Disinfect denture
2. Modify denture with greenstick if required (minor)
3. Replicate dentures using lab made putty and 2 large stock trays with adhesive on them (out of the mouth)
4. Remove denture from mould, clean and return to patient
5. Disinfect moulds
6. Get lab to make replica wax blocks with shellac base

Stage 2:
1. Disinfect blocks
2. Upper/lower master imps on record block (doubles as special tray)- border mould etc
3. Jaw reg with both blocks in- use jet bite
4. Choose shade and mould (technician will see previous mould)
5. Disinfect
6. Ask lab to cast impressions, mount on articulator and set upper and lower teeth in wax

Carry on as normal

37
Q

Landmarks on Upper cast:

A

Labial Frenum
Incisive papilla
Buccal sulcus
Labial sulcus
Rugea area
Hauler notch
Tuberosity
Palatine Raphe
Palatine fovea

38
Q

Landmarks on lower cast:

A

Retromolar pad
Mylohyoid ridge
Lingual sulcus
Buccal shelf
Buccal sulcus
Labial sulcus
Lingual frenum

39
Q

What are the issues with incorrect OVD?

A

Instability
Clicking
Whistling
Pain
Occlusal trauma in RPD
TMD aggravation
Angular cheilitis

40
Q

What medicines are used for Denture stomatitis?

A

Topical
* Miconazole
* Nystatin
* CHX

Systemic
* Fluconazole
* Itraconazole

41
Q

Where should the post dam be?

A

At vibrating line (between hauler notches)- junction of hard and soft palate

42
Q

What is the distal extension of lower complete denture?

A

2/3 along the retromolar pad

43
Q

Why is the buccal shelf used for support?

A

Non-resorbable

44
Q

What anatomical features helps set incisors?

A

1cm anterior to incisive papilla

Parallel to inter-pupillary line

Using philtre as midline

Have 1-2mm incisal edge showing at rest

45
Q

What 4 things make up shade?

A

Value

Chroma

Hue

Translucency

46
Q

What are the advantages of immediate dentures?

A

Maintains aesthetics

Haemorrhage control

Maintains soft tissue

Helps with transition

Protects socket

Maintains jaw relationship

Maintains face height

47
Q

What are the disadvantages of immediate dentures?

A

Patient needs to pay for 2 sets or reline/rebase

Resorption makes fit poor

No trial stage

Difficult after surgical extractions

48
Q

What should a prescription for special tray for upper and Lower dentures contain?

A

Please construct upper and lower special trays in light cure acrylic with IO/EO handles and spacing

Spacing:

Alginate- 3mm

Silicone or polyether:
Upper- 2mm
Lower- 0.5-1mm

BDS Exam style questions (15 decks)

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