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BDS Finals > Prosthodontics > Flashcards

Prosthodontics Flashcards

1
Q

How much of the retromolar pad should be covered by a complete dentrue

A

2/3

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2
Q

What are the stages in conventional complete denture design (7)

A

Assessment
Primary impressions
Master impressions
Registration
Trial insertion
Insertion/Delivery
Maintenance/Review

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3
Q

What makes it easier to see a patients vibrating line

A

Get them to say ah

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4
Q

How do you know an impression tray is too small

A

The flanges hit the ridge or do not cover all the areas

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5
Q

How do you know which kind of impression material to use? (3)

A

If there are undercuts use an elastic material
If there are bounded saddles - alginate.
Free end saddles - alginate + compound

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6
Q

Where should you stand to take a maxillary impression

A

Behind the patient

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7
Q

Where should you stand to take a mandibular impression

A

In front of the patient

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8
Q

How should you assess/inspect a primary impression (4)

A
  1. Denture bearing area covered?
  2. Peripheral seal achieved?
  3. Adequate surface detail?
  4. No or minimal voids
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9
Q

What are the steps in a complete denture registration visit? (7)

A
  1. Measure vertical dimension and establish face height
  2. Adjust upper block for retention
  3. Adjust upper for tooth position
  4. Adjust upper for occlusal plane
  5. Lower tooth position
  6. Registration
  7. Selection of teeth
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10
Q

What equipment is needed at a complete denture registration visit? (4)

A
  1. Iron
  2. Wax knife
  3. Foxes bite plane
  4. Willis bite gauge
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11
Q

What does LIMBO stand for (Complete dentures)

A

Lip Support
Incisal Level
Midline
Buccal Corridor
Occlusal Plane

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12
Q

What should you mark on an occlusal record block (Complete dentures) (3)

A
  1. Midline
  2. Canine line
  3. High lip line
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13
Q

How do you calculate freeway space?

A

Resting vertical dimension - OVD

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14
Q

How do you decide what width of teeth to use for complete dentures?

A

Using a transparent flexible mirror, measure from the distal side of each canine and use this to select teeth

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15
Q

What different types of posterior teeth are available for dentures (3)

A

Cuspless
Hybrid (12 degree angle)
Cuspled teeth (33 degree angle)

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16
Q

What should you do with a trial wax denture before the patient arrives

A

Test it on an articulator

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17
Q

How can you tell if a complete denture is underextended

A

Insert the denture and move the tissues away

If the denture drops, it is under/over extended

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18
Q

What is a post dam

A

A lip on the back of a denture to give a better peripheral seal

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19
Q

Instructions for patients that have been given a complete denture (3)

A
  1. Remove the denture at night
  2. Clean it regularly
  3. Build up difficulty of food
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20
Q

Kennedy Class I

A

Bilateral free end saddle

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21
Q

Kennedy Class II

A

Unilateral free end saddle

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22
Q

Kennedy Class III

A

Bounded Saddle

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23
Q

Kennedy Class IV

A

Anterior bounded saddle crossing midline

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24
Q

Modification of Kennedy classes

A

How many extra saddles there are, not included in the classification

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25
Q

Craddock’s Class 1

A

Tooth borne support

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26
Q

Craddock’s Class 2

A

Mucosa borne support

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27
Q

Craddock’s Class 3

A

Combination tooth and mucosa support

28
Q

Support

A

Resistance to vertical movement

29
Q

Retention

A

Resistance to displacement in a vertical direction

30
Q

Stability

A

Resistance to horizontal movement

31
Q

Retention methods for RPD (3)

A
  1. Clasps
  2. Soft tissue undercuts
  3. Path of insertion
32
Q

Indirect Retention

A

Resistance to rotational displacement

33
Q

Stages in producing a RPD (5)

A
  1. Assessment, primary impressions and denture design
  2. Master impressions
  3. Framework trial + record occlusion
  4. Tooth trial
  5. Review
34
Q

Why would you need a Primary Record Block (RPD)

A

To see how the teeth meet if it is not obvious

35
Q

What does a Primary Record Block do to the treatment plan

A

Adds an extra session before the casts can be mounted on an articulator

36
Q

Instructions to the technician after master impressions for RPD for a cobalt chrome base

A

Pour model in improved stone
Construct framework as per design

37
Q

Instructions to technician after master impressions for RPD for an acrylic denture base

A

Pour model in stone
Construct record block with shellac base

38
Q

When should radiographs be taken for denture patients (2)

A

To assess abutment teeth
To check for pathologies and/or retained roots

39
Q

How do you use adhesive for impression material

A

Apply the adhesive to all sides of the tray, including the outside. Then wait for the solvent to evaporate before applying there impression material

40
Q

How is a border seal achieved on dentures

A

Achieved by extending the denture flanges to the depth of the functional sulcus

41
Q

How should you test the retention of an upper denture

A

Pull on an anterior tooth

42
Q

How should you test stability of a denture

A

Try and rock it back and forth

43
Q

Definition of impressions

A

A reverse or negative of the tissues

44
Q

Decontamination of an impression

A

Rinse under the tap to remove gross saliva then perform for 10 minutes afterwards

45
Q

What should be mentioned on a prescription card for special trays (5)

A
  1. Light cured acrylic special trays
  2. Intra/Extra-oral handles
  3. Spacing
    - Alginate (3mm)
    - Silicone/Polyether
    - Spaced 2mm (upper)
    - Close fitting 0.5mm-1mm (lower)
46
Q

What should you mark on a primary impression

A

Where you would like the special tray with an indelible pencil

47
Q

What should the nasolabial angle be with good lip support from a denture

A

90 degrees

48
Q

How do you check the incisal level of a denture (2)

A

Get the patient to say f or v
Drop the lower lip should have around 1mm of tooth showing

49
Q

Upper anterior tooth position on complete dentures

A

Ideally less than 1cm to incisive papilla. 1cm isn’t very stable

50
Q

Where should canines be on a complete denture

A

Below the nose

51
Q

What should you use and how should you adjust the wax record block for the occlusal plane (4)

A

Foxes bite plane
Hold a ruler parallel to it
Should be flat or angled up slightly at the back
Don’t alter incisors, only the back

52
Q

Lower anterior tooth position for complete dentures

A

Should be over the ridge or very slightly forward

53
Q

Lower posterior tooth position for complete dentures

A

Should be over the residual ridge in the neutral zone

54
Q

In a tooth trial which denture should be inserted first

A

Lower
Upper can be dislodged when placing lower

55
Q

What should you check during a tooth trial (5)

A
  1. Extension
  2. Retention
  3. Stability
  4. Occlusion (Resting Face Height first)
  5. Appearance
56
Q

SDA

A

Shortened Dental Arch

57
Q

How much of the undercut should a clasp arm engage

A

1/3

58
Q

Classification of Ridges (6)

A

I. Dentate
II. Post extraction
III. Broad alveolar process
IV. Knife edge
V. Flat ridge (no alveolar process)
VI. Submerged ridge (loss of basal bone)

59
Q

Advice for new dentures regarding pain (3)

A
  1. If there is minor pain, persevere it will subside
  2. If there is major pain take them out and wear old dentures
  3. Put new dentures in the morning of dental appointment so we can see where they rub
60
Q

What aspect should not be recorded by compound impression material

A

The teeth
If this happens, simply cut the impression compound to cut out the teeth

61
Q

What helps check occlusion for a partial denture

A

Use a natural tooth contact

62
Q

Types of Gypsum Product (3)

A

Dental Plaster
Dental Stone
Improved Stone

63
Q

Modifications made to teeth for dentures (3)

A

Cutting rest seats
Composite build up
Cutting guide planes

64
Q

When should a denture design be completed for a cobalt chrome denture

A

Before master impressions are taken

At the primary impression stage

65
Q

Bracing

A

Prevents a clasp arm from moving the tooth

66
Q

RPI

A

Rest (mesial)
Proximal guide plate
Gingivally approaching I bar clasp

BDS Finals (23 decks)

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