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1. SBA > removable pros > Flashcards

removable pros Flashcards

1
Q

Which of the following materials is most suitable for modifying a stock tray for a primary impression?

a. green stick
b. pink stick
c. silicone putty
d. ribbon wax

A

c - silicone putty

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2
Q

What can be defined as the resistance to vertical movement of a denture away from the underlying mucosa

a. stability
b. retention
c. support
d. rigidity

A

B - retention

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3
Q

According to Cawood and Howell’s descriptive classification, a class IV ridge is:

a. negative
b. atrophic
c. recent extraction
d. knife-edged

A

D - knife edged

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4
Q

Provil putty is a type of what:

a. polysulphide
b. condensation cured-silicone
c. polyether
d. addition cured silicone

A

D - addition cured silicone

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5
Q

Which of the following can be defined as:
the difference between the resting face height and the occlusal vertical dimension?

a. interproximal space
b. vertical overlap
c. stability
d. freeway space

A

D - freeway space

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6
Q

Which impression material has a double decomposition reaction involving calcium sulphate and is popular because it is cheap and can be used in a stock tray?

a. condensation cured silicone
b. polyether
c. polysulphide
d. zinc oxide eugenol impression paste
e. irreversible hydrocolloid (alginate)

A

E - irreversible hydrocolloid

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7
Q

Which impression material is available in sheet or disc form and is softened in a water bath set to 55-60º to be used in stock trays for edentulous ridges?

a. irreversible hydrocolloid (alginate)
b. reversible hydrocolloid (agar)
c. zinc oxide eugenol impression paste
d. impression compound
e. silicone putty

A

D - impression compound

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8
Q

Overjet is defined as:

a. a horizontal measure
b. a vertical measure

A

A - horizontal measure b

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9
Q

How many times greater does ridge resorption occur in the mandible compared to the maxilla?

A

4 x

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10
Q

Define retention -

A

Resistance to displacive forces directed away from the tissues.

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11
Q

Define support -

A

resistance to forces directed towards the hard / soft tissues.

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12
Q

Define reciprocation -

A

the compensating element to counteract horizontal force from active clasps.

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13
Q

Define bracing -

A

resistance to horizontal forces when fully seated.

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14
Q

Define what a connector is -

A

links all the components of the denture together in a place that won’t damage the soft tissues.

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15
Q

Define indirect retention -

A

resistance to displacive forces along the retentive axis.

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16
Q

Define syneresis -

A

evaporation from the colloid compound, causing the alginate to shrink due to loss of water.

(prevented by wrapping the imp in damp gauze)

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17
Q

Define inbibition -

A

when a hydrocolloid compound absorbs too much water, leading to swelling.

(happens when imp is stored for too long in moist environment)

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18
Q

Define vibrating line -

A

The junction between the hard and soft palate.

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19
Q

What is the purpose of having tissue stops on special trays?

A

Ensures uniform thickness of impression material - can’t press the tray any further.

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20
Q

What should be written in the lab prescription when requesting an upper special tray for alginate?

A

please cast impressions in dental stone and construct:

upper special tray for alginate (2-3mm spacing) with tissue stops and stepped handle.

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21
Q

What should be written in the lab prescription when requesting a lower special tray for PVS?

A

please cast impressions in dental stone and construct:

lower special tray for PVS (1.5-2mm spacing) with tissue stops, sub-handle and finger rests (x2 in the premolar region).

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22
Q

What is the recommended spacing for alginate?

A

2-3mm

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23
Q

What is the recommended spacing for PVS?

A

1.5-2mm

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24
Q

Which is the only reproducible position in edentulous patients?

A

Retruded Contact Position (RCP)

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25
Q

Describe Retruded Contact Position

A

Tooth contact maintained with with jaw moved back around 1mm until the condyles can’t go any further.

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26
Q

Which positioning is not present in edentulous patients?

A

Intercuspal Position (ICP)

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27
Q

Describe Intercuspal Position

A

The vertical and horizontal position of the mandible when the upper and lower teeth are in maximum intercuspation (biting).

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28
Q

Describe Occlusal Vertical Dimension

A

The distance between 2 points (tip of nose and bottom of chin) when teeth are in occlusion.

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29
Q

How is OVD measured?

A

With a Willis Bite Gauge

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30
Q

How is freeway space calculated?

A

RFH - OVD = FWS

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31
Q

What does Foxes Occlusal Plane Guide measure?

A

The occlusal plane parallel to the alar tragal line.

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32
Q

What does the Alma gauge measure?

A

The incisal edge relationship to the incisive papilla in a horizontal and vertical measure (8-10mm)

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33
Q

Curve of Spee

A

anterior-posterior curve from the cusp tip of the mandibular canine along the cusps of rest of posterior teeth.

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34
Q

Curve of Monson

A

bilateral curve through the buccal and lingual cusps of mandibular molars going through the tongue.

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35
Q

Are radiographs justified in the treatment planning stage of complete denture provision?

A

No - unless there is a clear indication (e.g: suspected retained roots).

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36
Q

Which pathogen is associated with denture stomatitis?

A

candida albicans

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37
Q

Which condition may occur concurrently with denture stomatitis? (also fungal)

A

angular chelitis

38
Q

What is the minimum inter-occlusal clearance in the premolar region? (FWS)

A

2-4 mm

39
Q

Example of a chairside soft reline material:

A

Coe-soft

40
Q

Example of a tissue conditioner:

A

visco-gel

41
Q

Example of a definitive soft-lining material:

A

molloplast-B
(silicone based)

42
Q

Example of a definitive soft reline material:

A

self or heat cured acrylic resin

43
Q

When is a primary jaw reg indicated?

A

For cobalt-chrome - design is influenced by occlusal relationships.

44
Q

When is a primary jaw reg not indicated?

A
  1. when a complete denture is going to oppose the partial
  2. acrylic dentures only
45
Q

How deep should rests be prepared into enamel?

A

0.5-1mm

46
Q

Which stage follows second impressions when creating a cobalt chrome denture?

A

framework try-in

47
Q

Outline the clinical stages when making complete dentures.

A
  1. Treatment planning, diagnosis and 1st imps
  2. 2nd imps
  3. Jaw Reg
  4. Try In
  5. Fit
48
Q

Problems arising from insufficient FWS:

A

(teeth too big)

  • pain beneath dentures
  • MoM and TMJ pain
  • difficulty chewing and speaking
  • difficulty making an oral seal with lips
49
Q

Problems caused by excessive FWS:

A
  • poor appearance (over-closed)
  • difficulty chewing
  • TMJ discomfort
  • cheek biting
50
Q

Which 3/4 components provide support?

A
  1. rests
  2. saddles
  3. connectors and collets
51
Q

Which components provide retention?

A
  1. clasp length
  2. guide planes
  3. ridge undercut in saddle areas
52
Q

Which components provide reciprocation?

A
  1. collets
  2. passive arms opposing clasps
  3. rests
53
Q

Which components provide bracing?

A
  1. collets
  2. passive arms opposing clasps
  3. rests
  4. clasps
  5. flange extension in saddle areas
  6. connectors on vertical surfaces
  7. guide planes
54
Q

How many mm of depth does a lingual bar need?

A

8mm

55
Q

How much of a clasp needs to be in undercut?

A

the final 1/3

56
Q

Sizes of Undercut:

A

0.25mm - Co/Cr
0.5mm - stainless steel
0.75mm - gold

57
Q

Preston’s Golden Nugget

A

You can have a rest without a clasp but you can’t have a clasp without a rest.

58
Q

What do you need for stable occlusion?

A

tripodisation of 3 index teeth

59
Q

What is the path of insertion for when an anterior saddle is present?

A

anterior to posterior

60
Q

Path of insertion for when no anterior saddle is present.

A

posterior to anterior

61
Q

What type of acrylic is used for over denture bases and why?

A

polyethereytherketone (PEEK) -
used due to excellent chemical resistance.

62
Q

Which type of lower CoCr connector provides maximum indirect retention?

A

lingual plate

63
Q

When picking a mould of denture teeth, the theory of the shape of a tooth resembling the face shape can be used.
What is the name of this theory?

A

Leon-Williams face form -
(think of it as mr bassi - mrs williams collab)

64
Q

Which piece of equipment is used to measure lip support and what should the ideal reading be?

A

alma gauge - 9-12mm
(measures incisal edge position in both a horizontal and vertical plane relative to the incisal papilla)

65
Q

What material is applied to the upper and lower reg rims to record centric occlusion?

A

aquasil

66
Q

When would a reg be required for immediate dentures?

A

no stable occlusion

67
Q

What is the one surface that cannot be changed for a copy denture?

A

the polished surface

68
Q

In what situation would a jaw reg be appropriate when constructing a copy denture?

A

when a change in OVD is planned

69
Q

Classes of ridge assessment:

A

1 - dentate
2 - immediately post XLA
3 - well formed ridge
4 - knife edged ridge
5 - flat ridge
6 - negative ridge

70
Q

What is the name for the distance between upper and lower incisors in the horizontal plane and what is its average value?

A

overjet (forward), 2-4mm

71
Q

The distance between upper and lower incisors when viewed anteriorly.

A

overbite

72
Q

Saddle -

A

The part of the denture which covers the edentulous area containing toothwork etc.

73
Q

Connector -

A

Joins together the components of a denture.

(e.g: plate, ring, lingual bar / sub-lingual bar)

74
Q

Retention -

A

Resistance to displacive forces AWAY from the tissues.

(clasps, guide planes, ridge undercut in saddles)

75
Q

Support -

A

Resistance to displacive forces directed TOWARDS the tissues.

(rests, saddles, connectors and collets)

76
Q

Reciprocation -

A

The compensating element to counteract the horizontal forces from an active clasp.

(collets, passive arms, rests)

77
Q

Bracing -

A

Resistance to horizontal forces when fully seated.

(collets, passive arms, rests, clasps, flange, connector, guide planes)

78
Q

Indirect Retention -

A

Resistance to displacive forces along the retentive axis — this is through the tips of clasps.

(rests, connectors, collets, guide plates)

79
Q

Guide Planes -

A

two or more parallel surfaces on abutment teeth used to limit the path of insertion and provide retention/stability.

80
Q

Free End Saddle -

A

An edentulous area posterior to the natural teeth.

81
Q

Kennedy Class I -

A

bilateral free end saddle.

82
Q

Kennedy Class II -

A

Unilateral free-end saddle.

83
Q

Kennedy Class III -

A

Unilateral bounded saddle.

84
Q

Kennedy Class IV -

A

anterior bounded saddle only - no modifications!

85
Q

When can a lingual bar be used?

A

When there is around 8mm between the floor of the mouth and the gingival margin to give 3mm clearance from the gingivae.

86
Q

What are the 2 purposes of rests?

A

To provide support and prevent overeruption.

87
Q

How do clasps provide retention?

A

By engaging the undercut of the tooth.

88
Q

Which type of clasp can be used when there is a high survey line present?

A

ring clasp

89
Q

Which clasp can be used when a diagonal survey line is present sloping downwards?

A

gingivally approaching clasp

90
Q

What should be done when a low survey line is present?

A

Modify the tooth with composite.

91
Q

Which type of clasp can be used when a medium survey line is present?

A

C clasp

1. SBA (39 decks)

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