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DS4101 > W1 - Cr-Co Dentures - Abbott > Flashcards

W1 - Cr-Co Dentures - Abbott Flashcards

1
Q

Overview of RPD components

A
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2
Q

Requirements of major connectors

A
  1. Rigidity
  2. Provide cross-arch stability and force-distribution
  3. No interference with tongue or disruption of anatomy (md or palate)
  4. No food trapping
  5. Cover no more tissue than absolutely necessary
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3
Q

Design guidelines of Major connectors

A
  1. Free from movable tissue
  2. Avoids impingement of gingival tissue
  3. Bony and soft tissue prominences to be avoided (if impossible, provide relief)
  4. Borders should run parallel to the gingival margins of remaining teeth
  5. If gingival margins of teeth must be crossed, should be crossed at right angles
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4
Q

How far should the border of a maxillary major connector be from the free gingival margin

A
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5
Q

How far should the border of a mandibular major connector be from the free gingival margin

A
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6
Q

2 most commonly used mandibular major connectors

A

Lingual bar

Lingual plate

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7
Q

When to use lingual bar vs lingual plate

A

Lingual bar - ideal, more comfortable, hygienic, go-to option

Lingual plate - if incisors are perio involved, if space btw gingival tissue and lingual sulcus is less than 8mm, frenum or tori

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8
Q

What can be done to lingual plate if pt has diastemas

A

Use interrupted lingual plate

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9
Q

6 Types of maxillary major connectors

A
  1. Palatal strap
  2. Anterior-posterior palatal strap
  3. Palatal plate
  4. U-shaped / horse-shoe
  5. Palatal bar
  6. Anterior-posterior bar
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10
Q

2 Types of Saddles / retentive framework

A
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11
Q

2 Functions of rests

A
  1. Provide a vertical stop
  2. Transfer force onto teeth and tissue
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12
Q

Primary rest vs secondary / auxillary rest

A

Primary - rest that is part of retentive clasp assembly

Secondary - responsible for additional support or indirect retention

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13
Q

3 types of rest design

A

Occlusal

Lingual/cingulum

Incisal

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14
Q

Supra-bulge vs Infra-bulge clasps

A

Supra- occlusal approach (circumferential clasps)

Infra- gingival approach (bar types)

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15
Q

List some examples of suprabulge clasps

A
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16
Q

How do the reciprocal and retentive arms differ in suprabulge clasps?

A

⅓ of retentive arm engages undercut

Reciprocal arm never goes below surveyed line

17
Q

Contraindications of infra-bulge clasps

A

Deep cervical tooth undercut

Severe tissue undercut

Shallow vestibule (4mm)

When survey line is close to the occlusal surface

18
Q

What is the Height of Countour?

A

Surveyed line on abutment teeth

19
Q

Where should indirect retainers be placed?

A

Perpendicularly from the fulcrum line as far forward as practical

20
Q

What are the sequences of the design system of RPD

A

Support → Retention → Stability

21
Q

What RPD components make up the support system

A

Saddles

Rests

22
Q

What RPD components make up the retention system

A

Direct retainers (clasps or attachments)

23
Q

What RPD components make up the stability system

A

Reciprocation arms

Minor connectors

Major connector

24
Q

Alternatives to clasp-retained RPD

A

Rotational Path RPD

Twin Flex clasps

Tooth-color clasps

Attachments

Locator attachment Implants

25
Q
A

kennedy class 3

26
Q
A

kennedy class 4

27
Q

Undercuts greater than ______ cannot be used for Co-Cr

A

0.25

suggest acrylic denture

28
Q

Clinical steps of making RPD

A
  1. Take alginate imps for study models
  2. Survey study model
  3. Design RPD - pencil sketch
  4. Give pt estimate $$$
  5. Make special tray
  6. Prepare dentition (ex- occlusal rests)
  7. Take secondary impression (PVS or polyether)
  8. Send imp to lab and ask for framework to be returned with wax rim attached
  9. Check framework is seating properly (now is the time to reject)
  10. Jaw relation and shade selection
  11. Try in wax up, send for processing if happy
  12. Insertion of RPD
  13. Recall in 7 days
29
Q

What should be checked at trial insertion of RPD (3)

A

Clasp engagment

Occlusal rest seating

Articulation

31
Q

How long should a retentive clasp be?

32
Q

Where should the tip end in an I-bar clasp?

A

Tip should end at the most prominent part of the bucccal surface of the abutment tooth

33
Q

Where should the clasps be placed in a kennedy class 2 pt?

A

One clasp as close to saddle as possible

Other clasp as far posteriorly as possible on opposite arch

34
Q

How should be the bur be held when preparing cingulum rest sites?

A

parallel to long axis of tooth

35
Q

Why can’t composite be used to build up a rest site instead of drilling into tooth structure?

36
Q

What are the 5 basic parts of a clasp assembly?

A
  1. Rest
  2. Body of the clasp
  3. Minor Connector
  4. Retentive arm
  5. Reciprocal arm
37
Q

Dimensions of occlusal rest seat preparation

A

1.5mm deep

2mm wide

Spoon-shaped

DS4101 (43 decks)

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