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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
Craddock's Class 1
Tooth borne support
26
Craddock's Class 2
Mucosa borne support
27
Craddock's Class 3
Combination tooth and mucosa support
28
Support
Resistance to vertical movement
29
Retention
Resistance to displacement in a vertical direction
30
Stability
Resistance to horizontal movement
31
Retention methods for RPD (3)
1. Clasps 2. Soft tissue undercuts 3. Path of insertion
32
Indirect Retention
Resistance to rotational displacement
33
Stages in producing a RPD (5)
1. Assessment, primary impressions and denture design 2. Master impressions 3. Framework trial + record occlusion 4. Tooth trial 5. Review
34
Why would you need a Primary Record Block (RPD)
To see how the teeth meet if it is not obvious
35
What does a Primary Record Block do to the treatment plan
Adds an extra session before the casts can be mounted on an articulator
36
Instructions to the technician after master impressions for RPD for a cobalt chrome base
Pour model in improved stone Construct framework as per design
37
Instructions to technician after master impressions for RPD for an acrylic denture base
Pour model in stone Construct record block with shellac base
38
When should radiographs be taken for denture patients (2)
To assess abutment teeth To check for pathologies and/or retained roots
39
How do you use adhesive for impression material
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
How is a border seal achieved on dentures
Achieved by extending the denture flanges to the depth of the functional sulcus
41
How should you test the retention of an upper denture
Pull on an anterior tooth
42
How should you test stability of a denture
Try and rock it back and forth
43
Definition of impressions
A reverse or negative of the tissues
44
Decontamination of an impression
Rinse under the tap to remove gross saliva then perform for 10 minutes afterwards
45
What should be mentioned on a prescription card for special trays (5)
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
What should you mark on a primary impression
Where you would like the special tray with an indelible pencil
47
What should the nasolabial angle be with good lip support from a denture
90 degrees
48
How do you check the incisal level of a denture (2)
Get the patient to say f or v Drop the lower lip should have around 1mm of tooth showing
49
Upper anterior tooth position on complete dentures
Ideally less than 1cm to incisive papilla. 1cm isn’t very stable
50
Where should canines be on a complete denture
Below the nose
51
What should you use and how should you adjust the wax record block for the occlusal plane (4)
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
Lower anterior tooth position for complete dentures
Should be over the ridge or very slightly forward
53
Lower posterior tooth position for complete dentures
Should be over the residual ridge in the neutral zone
54
In a tooth trial which denture should be inserted first
Lower Upper can be dislodged when placing lower
55
What should you check during a tooth trial (5)
1. Extension 2. Retention 3. Stability 4. Occlusion (Resting Face Height first) 5. Appearance
56
SDA
Shortened Dental Arch
57
How much of the undercut should a clasp arm engage
1/3
58
Classification of Ridges (6)
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
Advice for new dentures regarding pain (3)
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
What aspect should not be recorded by compound impression material
The teeth If this happens, simply cut the impression compound to cut out the teeth
61
What helps check occlusion for a partial denture
Use a natural tooth contact
62
Types of Gypsum Product (3)
Dental Plaster Dental Stone Improved Stone
63
Modifications made to teeth for dentures (3)
Cutting rest seats Composite build up Cutting guide planes
64
When should a denture design be completed for a cobalt chrome denture
Before master impressions are taken At the primary impression stage
65
Bracing
Prevents a clasp arm from moving the tooth
66
RPI
Rest (mesial) Proximal guide plate Gingivally approaching I bar clasp

BDS Finals (22 decks)

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