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BDS2 OSCE PREP > RPD OSCE > Flashcards

RPD OSCE Flashcards

1
Q

what are saddles?

A

the teeth being replaced by RPD

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2
Q

what is seen in a patient with Kennedy Class I ?

A

bilateral free end saddle

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3
Q

what is seen in a patient with Kennedy Class II?

A

Unilateral free end saddle

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4
Q

what is seen in a patient with Kennedy Class III ?

A

bounded saddle

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5
Q

what is seen in a patient with Kennedy Class IV ?

A

anterior bounded saddle that crosses the midline

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6
Q

if there are multiple saddles, what saddle is the Kennedy Classification score based on?

A

the MOST POSTERIOR saddle

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7
Q

what is support defined as in relation to RPD design?

A

the resistance of the denture to occlusally directed load

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8
Q

what is seen in a patient with Craddock Class 1?

A

tooth borne support

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9
Q

what is seen in a patient with Craddock Class 2?

A

mucosa borne support

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10
Q

what is seen in a patient with Craddock Class 3?

A

combination of tooth and mucosa borne support

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11
Q

what is retention defined as in relation to RPD design?

A

the resistance of the denture to vertical displacement/lifting away from the tissues

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12
Q

What are the different methods of providing retention to an RPD?

A
  • clasps
  • soft tissue undercuts
  • path of insertion
  • adhesion
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13
Q

what is indirect retention defined as in relation to RPD design?

A

the resistance of the denture to rotational displacement

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14
Q

what is indirect retention provided by?

A

rests! (not clasps)

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15
Q

what is reciprocation defined as in relation to RPD design?

A

reciprocation prevents a clasp arm moving a clasped tooth

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16
Q

what are the undercut gauges used when surveying for clasps?

A
  1. 25mm
  2. 50mm
  3. 75mm
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17
Q

There is an undercut of 0.25mm, what material would the clasp be made of?

A

Cobalt Chromium

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18
Q

There is an undercut of 0.5mm, what material would the clasp be made of?

A

wrought gold

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19
Q

There is an undercut of 0.75mm, what material would the clasp be made of?

A

stainless steel

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20
Q

What method of support is better, tooth borne or mucosa borne? WHY?

A

TOOTH BORNE

  • transmits load via periodontal ligament, more natural for patient
  • more comfortable for patient
  • protects soft tissue from trauma
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21
Q

Why are the problems with Mucosal Support?

A
  • Must cover as large an area as possible or there will be REDUCTION OF OCCLUSAL TABLE
  • Allows the denture base to move slightly which can cause TRAUMA TO ADJACENT GINGIVAL MARGINS
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22
Q

What load of support can a healthy tooth carry? (potentially)

A

A healthy tooth can potentially carry its own load plus one and a half similar teeth

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23
Q

What teeth are best for providing support?

A 
1st = molars
2nd = canines
3rd = premolars
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24
Q

What teeth should be avoided when looking to provide support?

A

The incisors

- lower incisors are weakest (smallest root)

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25
Q

How should rests be positioned?

A

Rests positioned so that they transfer load through the long axis of the tooth to prevent tilting

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26
Q

Why shouldn’t the denture base be positioned within 3mm of the gingival margin?

A

Soft tissue is compressible, this will place pressure at the gingival margin

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27
Q

Where does mucosal support mainly come from in a maxillary denture?

A

Hard palate

28
Q

Where does mucosal support come from in a Mandibular denture?

A
  • Tends to come from the buccal shelf (on right and left area)
  • Edentulous area may gain support from pear shaped pad
29
Q

Why is having support from the alveolar bone bad?

A

Alveolar bone RESORBS

30
Q

What are the tooth supportive components used in RPD design?

A

RESTS

31
Q

Where is an Occlusal Rest located?

A

On the occlusal surface of the tooth

32
Q

Where is a Cingulum rest located?

A

on the cingulum of the cingulum of the anterior teeth

33
Q

What type of rests can be used on purely acrylic dentures? Why is this tricky?

A

Wrought stainless steel

- causes a low base strength

34
Q

Why are small rests NOT recommended?

A

They apply large forces per unit area…

- Large rests direct the force down the long axis of the tooth

35
Q

Why are incisal rests not commonly used?

A

Poor aesthetics

Usually interferes with occlusion

36
Q

Where are cingulum rests most commonly located?

A

On maxillary and mandibular canines

- Unless prominent cingulum is present A REST PREPARATION IS REQUIRED

37
Q

What material type denture base is preferred? Why?

A

Metal framework base > PMMA (acrylic resin) base

- metal framework rigid and strong

38
Q

What is the root to crown ratio for lower central and lateral incisors?

A

1.0

39
Q

What is the root to crown ratio for lower canines?

A

1.7

40
Q

What is the root to crown ratio for lower 1st & 2nd premolars?

A

1.25

41
Q

What is the root to crown ratio for lower molars?

A

2.7

42
Q

What is the root to crown ratio for upper central incisors?

A

1.3

43
Q

What is the root to crown ratio for upper lateral incisors?

A

1.1

44
Q

What is the root to crown ratio for upper canines?

A

1.7

45
Q

What is the root to crown ratio for upper 1st and 2nd premolars?

A

1.4

46
Q

What is the root to crown ratio for upper molars?

A

2.7

47
Q

Where is the ‘default’ position to place a rest for a bounded saddle?

A

immediately adjacent to the saddle area.

48
Q

Where is the ‘default’ position for a rest in a free ended saddle?

A

The rests should be placed on the opposite side of the tooth adjacent to the saddle area (eg. mesial of tooth)

49
Q

Why can preparing a rest seat potentially be problematic?

A
  • destruction of tooth surface

- exposure of dentine

50
Q

What is a clasp ?

A

A metal arm that when in position contacts the tooth and prevents removal of the denture base

51
Q

Where must the clasp be located in order to be successful?

A

Below the bulbous part of the tooth (in an undercut)

52
Q

What are the different types of clasps known as?

A
  • occlusally approaching (clasps approach undercut from occlusal surface)
  • gingivally approaching (clasps approach undercut from gingival margin)
53
Q

What is an example of a gingivally approaching clasp?

A

I-Bar Clasp

54
Q

What are examples of occlusally approaching clasps?

A
  • self reciprocating clasps

- single arm clasp (with reciprocal arm)

55
Q

What is the ideal pattern of retention?

A

Triangular (as big as possible)

56
Q

What pattern of retention is provided by 2 claps?

A

straight line retention

57
Q

what is meant by CONNECTORS?

A

A term used to describe the rigid part of a RPD that unites all the components

  • minor connectors
  • major connectors
58
Q

What are the guidelines a major connector should follow?

A
  • be rigid
  • avoid covering gingival margins
  • cover as little tissue has possible
59
Q

What is the default connector for a lower RPD?

A

Lingual bar if possible

60
Q

There is less than 8mm of lingual space on the lower arch, what connector will be used?

A

Lingual plate design

61
Q

How thick should a lingual bar be to maintain rigidity?

A

2mm

62
Q

What connector design is desirable for a craddock class 2 denture? (mucosa borne)

A

Plate design

63
Q

What is the common choice connector design for a craddock class 1? (tooth borne)

A

Bar design

64
Q

What is the purpose of the RPI clasp system?

A

Stress relieving system

- prevents torking/rotation/tilting of the last standing abutment tooth

65
Q

What length should a CoCr clasp be?

A

15mm

BDS2 OSCE PREP (28 decks)

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