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Prosthetics > RPDs > Flashcards

RPDs Flashcards

1
Q

At what stage should denture design be completed?

A

Before secondary impressions

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2
Q

What are the stages of denture design?

A

Outline saddles
Plan support
Direct retention
Reciprocation
Indirect retention/anti-rotation
Major connectors
Minor connectors

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3
Q

2 rules of RPDs

A

Maximum support from the underlying anatomy of teeth and alveolar bone

Minimal gingival coverage

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4
Q

Why its support important?

A

Preserve remaining periodontal tissues and remaining teeth

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5
Q

Where is support derived from?

A

Remaining teeth
Underlying alveolar bone

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6
Q

Factors to consider when planning tooth support

A

Load transmitted along the long axis of tooth

Sufficient occlusal clearance for planned space

Tooth prep required

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7
Q

Which factors provide direct retention?

A

Contact points
Soft tissue engagement of alveolar undercuts
Displacing forces

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8
Q

What is reciprocation and how is it achieved?

A

Resistance to lateral displacing forces on clasped teeth

(arm/plate) No orthodontic movement

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9
Q

Why do we do composite build ups lingually of lower anteriors and canines?

A

So forces can be applied along the long axis of the tooth

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10
Q

What can be used to oppose a clasp on a long clinical crown?

A

arm

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11
Q

What can be used to oppose a clasp on a short clinical crown?

A

plate

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12
Q

What can RPDs restore?

A

Aesthetics
Function
Self esteem
Phonetics

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13
Q

What is support?

A

Resistance towards the tissues

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14
Q

What is retention?

A

Resistance away from the tissues

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15
Q

What is bracing?

A

Resistance to lateral displacing forces

enables clasps to function by keeping them opposed to the tooth

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16
Q

What can denture bases be made from?

A

Acrylic resin
CoCr
Titanium
Vinyl resin - flexible
Pecton
Stainless steel

17
Q

What is support derived from?

A

Occlusal rests
cingulum rests
Incisal rests

18
Q

What is the saddle?

A

Part of the base of the partial denture which rests on or covers the edentulous ridge - spread load applied

19
Q

What is the flange?

A

Part of the saddle that replaces missing (resorbed) buccal and lingual alveolar tissue

Flange aids retention and improves aesthetics

20
Q

Why are overdentures ideal?

A

Because they provide the perfect support BUT need good OH

21
Q

What is the purpose of rests?

A

Support framework against vertical load towards the tissues

Provides support by transferring the occlusal forces through the teeth and the PDL

When properly designed, transmit vertical loading through the long axis of abutment teeth

22
Q

What are the purpose of clasps

A

Provide retention and resistance

Flexible and act by engaging undercuts

23
Q

What portion of an occlusally approaching clasp should engage the undercut?

A

Terminal 1/3rd

24
Q

Where does a gingivally approaching clasp touch the gingivae?

A

Contact the tooth surface only at the tip
Rest of this clasp does not touch the mucosa or the gingival margin

Length of clasp makes it more flexible than occlusally approaching clasp

25
Q

Which factors affect clasp flexibility?

A

Alloy
Section
Length
Thickness
Curvature

26
Q

How much gingival clearance should a lingual bar have?

A

3mm

27
Q

When is a dental bar used?

A

Insufficient room between the gingival margin and the floor of the mouth for either a sublingual or lingual bar

Avoids damage to the periodontium

Used when there is lingual recession

28
Q

When is a lingual bar used?

A

Placed as low as the depth of the sulcus will allow

29
Q

When is a sublingual bar used?

A

Dimensions determined by master impression and it represent the functional depth and width of the sulcus

30
Q

When might a labial bar be used?

A

If teeth are severely lingually inclined

31
Q

What are the rules of rests if more than one tooth is missing?

A

rest on both adjacent teeth to saddle

32
Q

Where should a rest be placed?

A

Mesially unless the tooth is mesially angulated

33
Q

What should the functional sulcus depth be for a lingual bar?

A

> 8mm

Prosthetics (1 decks)

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