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BDS3 OSCE > Pros: partial dentures > Flashcards

Pros: partial dentures Flashcards

1
Q

You have taken primary impressions, what will you write on the lab card

A

Next stage: master impressions

Please pour cast in 50/50 plaster/stone and construct light cured non-perforated acrylic special trays with intraoral & extra oral handles
Please use 3mm spacer (if alginate) for master impressions

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2
Q

You have taken master impressions, what will you write on the lab cards

A

next stage: framework trial (CoCr only)

please pour cast in 100% improved stone and construct the chrome framework as per design below
please also construct a working duplicate cast of the master impression in 100% stone

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3
Q

You have done the framework trial, what will you write on the lab card for the next stage

A

next stage: record blocks

please construct upper/lower record blocks with a shellac base in the upper and a wire strengthener in the lower

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4
Q

You have done the jaw registration, what will you say to the lab next

A

next stage: tooth trial

Please set the lower teeth to the uppers in the registration provided and construct the metal framework wax trial. Tooth shade, material and mould

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5
Q

You have done the tooth trial, what is the next stage on the lab card

A

next stage: delivery

please flask and finish the denture in cocr and process in acrylic resin

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6
Q

What is kennedy class 1

A

bilateral free end

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7
Q

What is kennedy class 2

A

unilateral free end

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8
Q

What is kennedy class 3

A

unilateral bounded

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9
Q

What is kennedy class 4

A

anterior bounded (crossing the midline)

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10
Q

How is kennedy classification named

A

Named after the most posterior saddle, any other saddles result in mod

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11
Q

What is support

A

resistance of a denture to occlusally directed load

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12
Q

What is craddock class 1

A

tooth borne

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13
Q

What is craddock class 2

A

mucosa borne

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14
Q

What is craddock class 3

A

mucosa borne

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15
Q

What is support provided by mostly

A

rests

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16
Q

What do rests do

A

direct force down long axis of tooth

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17
Q

What are 3 types of rests

A 
Occlusal (molars & premolars)
Cingulum rests (where there is good cingulums e.g upper incisors and canines)
Incisal rests (can be used on incisors and canines)
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18
Q

What are functions of rests

A

Distributing load
Distribute horizontal force (bracing)
Maintaining components in right position
Protecting denture/abutment tooth junction
Providing indirect retention
Reciprocation
Preventing overeruption

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19
Q

What does selecting teeth that will provide support depend on

A

Root area of abutments
Health of abutments
Extend of saddles
Expected force on saddle

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20
Q

Where should a rest not be placed

A

somewhere that will interfere with occlusion

on the distal of abutments in free end saddle

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21
Q

What is retention

A

resistance of a denture to lifting away from the tissues

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22
Q

What are the 3 types of retention

A

Physical
Muscular
Mechanical

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23
Q

Where do we want direct retention

A

as close tos addle as possible

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24
Q

What can direct retention be provided by

A

guide planes and clasps

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25
Q

Where do clasps engage

A

undercut

26
Q

What are the 2 types of clasps

A

Occlusally approaching or gingivally approaching

Work best with a rest

27
Q

How much of the clasp sits in the undercut

A

Only terminal ⅓ sits below undercut

28
Q

How long is CoCr occlusally approaching clasps

A

15mm long

29
Q

What teeth can occlusally approaching only be used on

A

molars

30
Q

What pattern of retention do we want

A

triangular

31
Q

What is an RPI

A

Stress relieving clasp system

32
Q

What is the aim of the RPI

A

Prevents stress on last abutment

33
Q

How does the RPI prevent stress

A

Distal guide plate and I bar disengage from the tooth on loading to prevent harmful torque

34
Q

What are the 3 components of an RPI

A

rest
proximal plate
I bar clasp

35
Q

Where does the RPI rest sit

A

mesial side

36
Q

What is the proximal plate for in RPI

A

Reciprocation

Disengages when px bites and will move from above undercut to below undercut but not applying any pressure

37
Q

What is an I bar clasp

A

When patient bites it disengages

38
Q

What is indirect retention

A

Resistance to rotational displacement of denture

39
Q

What do we require to give indirect retention

A

Require something perpendicular to the clasp axis

If there is more than one clasp axis, look at the one closest to the saddle

40
Q

What is indirect retention provided by

A 
Major connectors
Minor connectors
Rest
Saddle
Denture base
NOT CLASPS
41
Q

What is reciprocation provided by

A

Clasp arm contacting a guide surface of a similar height to the retention distance
Plate making continuous contact with the tooth surface as the retentive arm moves through its retention distance

42
Q

What are the guidelines of minor connectors

A

Rigid
Finish above survey line
Cross GM at right angle
Cover as little gingival tissue as possible

43
Q

What are the guidelines of major connectors

A

Be rigid
Avoid covering GM
Be comfortable

44
Q

What are plates

A

Plate connector are thinner in cross section and give more mucosal support

45
Q

What are bars

A

Thicker in cross section (2mm thick)

Bar connector has less mucosal coverage

46
Q

What are the maxillary connectors

A 
Anterior palatal strap 
·       Mid palatal strap 
·       Posterior palatal strap 
·       Anterior posterior ring
·       Horseshoe 
·       Full palatal coverage
47
Q

What are the features of anteriro plate

A

Plate
· Good if you are avoiding a large torus
· Poor connector - lacks rigidity
· May provide indirect retention

48
Q

What are features of mid palatal strap

A

Plate
· Leave most gingival margins uncovered
· Well tolerated by patients - allows sensation to uncovered mucosa (incisive papillae left uncovered)

49
Q

What are features of posterior palatal bar

A

Bar
· Set to anterior border of vibrating line
· Greater part of palate left uncovered
· Not well tolerated if patient has an easily triggered gag reflex

50
Q

What are features of anterior posterior ring design

A

Bar
· Window allows for sensation but also a plaque trap
· Indicated where there is torus
· Good rigidity for low bulk
· Many edges for tongue to explore
· Greater cross sectional thickness

51
Q

What are features of a full palatal plate

A

Plate
· Can equally distribute forces between teeth and mucosa as it covers large areas
· It is possible to leave gingival margins of majority of teeth uncovered although this may act as a potential food trap

52
Q

What are features of the horseshoe

A

Plate or bar
· Good for when anterior also missing
· Always preferable to keep incisive papilla uncovered if possible
o Incisive papilla covered in this design
· A lot of palate uncovered

53
Q

What are the mandibular connectors

A 
Lingual bar
·       Lingual plate
·       Dental bar
·       Sublingual bar
·       Labial bar
54
Q

When is a labial bar chosen

A

Used when the lower anterior teeth are lingually inclined and therefore preventing a lingual bar

55
Q

What are features of a lingual bar

A

Ideal choice for mandible
· Well tolerated
· Less of a plaque trap
· Cannot be used when there is inadequate space (lingual recession) or prominent lingual frenulum

56
Q

What is the space required for a lingual bar

A

3mm clear of GM
o 4mm for lingual bar
o 1mm above the raised functional depth of the floor of the mouth

57
Q

What is a lingual plate

A

The lingual plate is well tolerated, presenting a smooth surface to the tongue, and is largely self cleansing on the lingual surface
Rests on the teeth so acts as a indirect retainer for free end saddle
Engages the mesial embrasure of abutment teeth so can’t move backwards
· GM covered - loss of natural friction and stagnation
· Oral hygiene must be meticulous
· Can act as a gum stripper

58
Q

What is the function of the dental bar

A

Like a shortened lingual plate
Lies on the teeth to avoid gingival damage
Used when there is insufficient room between GM and floor of the mouth
Difficult to ensure it is rigid
Due to the reduced height available on lingual sides of the teeth, the bar must be considerably thicker than a plate and therefore bulkier
Added bulk allows for debris to collect and some patients do not tolerate it well due to where the tip of the tongue sits in rest and in speech

59
Q

What is the function of a sublingual bar

A

Superior border should be 3mm from the GM and the inferior border located at the height of the alveolar sulcus when the patient’s tongue is slightly elevated, allowing for function
Very good functional impression is required

60
Q

What are different acrylic denture designs

A

spoon
modified spoon
every

BDS3 OSCE (65 decks)

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