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IODC - RPD > Lab Course - Session 1 > Flashcards

Lab Course - Session 1 Flashcards

1
Q

How are dentures classified in terms of support?

A

Mucosa borne
Tooth borne
Mixed

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2
Q

What is a mucosa borne RPD?

A

Made primarily from acrylic - relatively cheap
Metal components can be added for strength/ clasping
Easily modified

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3
Q

What is a tooth borne RPD?

A

Metal framework - teeth attached acrylic/composite
Support gained from rests
To be purely tooth borne - must be bounded saddles
Complex, time consuming, expensive
Can’t be modified
Need good OHI

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4
Q

What is a tooth/mucosa borne?

A

When no distal supporting teeth
Acrylic fitting surface = support saddle ares
Support gained from rests
Complex and expensive - challenging to provide adequate support and retention

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5
Q

Requirements of RPD?

A 
Aesthetic
Mastication
Comfort
Distribute occlusal forces appropriately
Retention
Maintain space and OVD
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6
Q

Advantages of RPD?

A

Aesthetic
Function
Tooth movement prevention
Maintain OVD

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7
Q

Disadvantages RPD?

A

Tooth loss greater > other methods
Increased plaque accumulation -caries/ gingivitis
Damage tooth tissue
Forces on teeth may impact on supporting structures

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8
Q

What is Kennedy classification?

A

Pattern of tooth loss

Class I - bilateral edentulous area posterior to remaining teeth
Class II - unilateral edentulous area posterior to remaining teeth
Class III - edentulous area between teeth
Class IV - edentulous area anterior to remaining teeth

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9
Q

What dental hx should you consider when assessing pt for RPD?

A

Is pt suitable? - perio condition etc
Does pt want/ need RPD?
Is RPD going to be destructive
Clinical need for further tx?

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10
Q

What should study model be used to assess?

A
  1. Edentulous area
  2. Undercut on remaining teeth
  3. Occlusion - study cast will need to be articulated
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11
Q

How is an RPD designed?

A

Something Really Complicated is Best Resolved in Many Stages

  1. Saddles
  2. Rest
  3. Clasp
  4. Indirect retention
  5. Bracing
  6. Reciprocation
  7. Major/minor connector
  8. Simplify
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12
Q

What is saddles?

A

The edentulous area -number and extent
Decide in denture tooth borne or tissue borne
What teeth need to be replaced - can reduce occlusal table?

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13
Q

What are rests?

A

Resist vertical force and transmit occlusal load down vertical axis of tooth
Cingulum or occlusal

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14
Q

What are clasps?

A

Provide mechanical retention and support
Resist displacement
Occlusally (L) or gingivally (T) approaching

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15
Q

Where should clasp engage?

A

Terminal 1/3 should engage within undercut - survey

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16
Q

What are indirect retention?

A

Clasps, rests, connectors

Resist rotation about clasp axis by acting on opposite site of displacing force

17
Q

What is bracing?

A

Resist horizontal (lateral) forces
Rigid components
Clasp arm/ plates

18
Q

What is reciprocation?

A

Clasps will always have sideways load during function - reciprocation opposes force

19
Q

What are connectors?

A

Major link saddle areas - create rigidity
Minor - connect small component to major

Contribute to support, bracing, direct and indirect retention
Should finish 3mm away gingival margin or above survey line

20
Q

How is support provided in mucosa borne denture?

A

Make acrylic footprint as large as possible

21
Q

How is support provided in tooth borne denture?

A

By bounded saddles and occlusal rests - ensure loads transmitted

22
Q

How is support provided to tooth/mucosa borne denture?

A

Free-ended saddles - position occlusal rest distal to saddle areas
- Load transmitted down long axis of tooth

23
Q

What does model surveyor do?

A

Shows undercut area relative to path of displacement

24
Q

How can path of insertion be used to create retention?

A

Path of insertion differs to path of displacement = resistant to displacement and therefore retention
Do this by blocking out undercut when making RPD

25
Q

When is engaging undercut easy and hard?

A

Is bilateral free ended saddle = easy

Multiple bounded saddles = difficult

26
Q

What are guide planes?

A

Produced to improve contact between RPD and tooth

27
Q

What does a single path of insertion acheive?

A

Limit displacement of denture to single path

Allows clasps to resist movement of displacement

28
Q

What can be caused by over-engaging undercut with clasp?

A

Trauma to tooth
Clasp to fracture

Only clasp tip should be used to engage - cited away from gingival tissue

29
Q

What are the rules of clasping?

A

Clasp each abutment tooth
Occlusally approaching posterior
Gingivally approaching anterior

30
Q

What is the length of a clasp and their undercut depth?

A

Length = 14mm

CoCr = 0.25mm undercut
Gold = 0.5mm undercut
SS = 0.75mm undercut
31
Q

Give examples of mandibular connectors?

A

Lingual bar
Lingual plate
Dental bar

IODC - RPD (4 decks)

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