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PRS03 - Removable Partial Dentures > PRS03 - Lecture 10 - Denture Design > Flashcards

PRS03 - Lecture 10 - Denture Design Flashcards

1
Q

What are the different kennedy classes?

A

Kennedy Class I - Bilateral free-end saddles

Kennedy Class II - Unilateral free-end saddle

Kennedy Class III - Unilateral bounded saddle

Kennedy class IV - Anterior bounded saddle (no mods possible)

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2
Q

Identify the classification of the picture below:

A

Kennedy Class I Modication I

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3
Q

Identify the classification of the picture below:

A

Kennedy Class II Modification I

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4
Q

Identify the classification of the picture below:

A

Kennedy Class III Modification I

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5
Q

What are the 3 support classifications?

A

Class I - Tooth Supported

Class II - Tissue supported

Class III - Tooth and tissue supported

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6
Q

What are the functions of rest seats? (2)

A

Vertical support

Direct functional forces to the long axis of the tooth

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7
Q

What are the 2 types of rest seats?

A

Occlusal

Cingulum

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8
Q

What are major connectors? (3)

A

Rigid connector that crosses palatally or lingually

Unites and stabilises parts of the prothesis on either side of the arch

By rigid x-arch construction

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9
Q

What are the 4 types of maxillary major connectors?

A

Strap

Horseshoe

Plate

Ring

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10
Q

What are the 4 types of mandibular major connectors?

A

Lingual bar - pear shaped in cross section

Lingual plate

Buccal bar - labial/buccal sulcus (used when you have lingual undercuts or lingual tori)

Dental bar

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11
Q

When should you use a lingual bar (over a plate)? (4)

A

2mm = from gingival margin -> top of bar

2mm = bottom of bar -> lingual sulcus

4mm = depth of bar

8mm = minimum space required from gingival margin -> depth of lingual sulcus

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12
Q

When would you use a buccal bar?

A

Lingual tori

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13
Q

What are minor connectors? (1)

A

Strong rigid part of the denture that connects other units to major connector

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14
Q

Give an example of a minor connector

A

Proximal plate - contacts the guide planes enabling the denture to follow the path of insertion

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15
Q

What is the function of retainers?

A

Components that help prevent displacement when under occlusal or masticatory load

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16
Q

What is retention? (1)

A

Resistance to vertically displacing forces

17
Q

Where is direct and indirect retention obtained from? (2:5)

A

Direct retention (2)

Clasps (predominantly)

Tissue undercuts

Indirect retention (5)

Continous clasp (kennedy bar) - prevents forward rotation

Cummer arm (on canines) - prevents forward rotation

Occlusal rest

Major connector

Denture flange

18
Q

What is indirect retention? (2)

A

Extention of the denture base that prevents displacement of the RPD through rotation

Considered for all cases but particularly for kennedy class I and 2 arches

19
Q

How would you determine where indirect retention will come from? (3)

A

Pass a line through tips of most anterior and posterior clasps on opposing sides of the arch

Bisect the line (90o) on opposite side of the arch to the free end saddle

Saddles cannot be displaced by forward rotation due to diagonal opposing contact with natural tooth

20
Q

What is denture base retention? (2)

A

Strong, rigid support for attachment of acrylic resin portion that carries artificial teeth

Retention is entirely mechanical

21
Q

What is denture base material? (2)

A

Part of the denture that rest on oral mucosa (where there are missing teeth)

Functions to: (3)

Support artificial teeth in desired position

Unite metal base with artificial teeth

Restores contour where natural tissues are lost

22
Q

What are the 3 components of a clasp?

A

Retentive

Support

Bracing

23
Q

What are the different types of clasps? (3:3)

A

Occlusal approaching clasps

C (or semi-encircling)

Ring (or fully-encircling)

Recurve arm

GIngival approaching clasps

I bar

T (roach)

1/2 T (one armed T roach)

24
Q

What determines clasp you would use? (4)

A

Survey lines (4)

High (very deep undercut) -> requires high flexibility class type

Medium -> occlusal + gingival approaching clasps

Low (little or no usable undercut) -> cant use gingival approaching clasps because it would be too close to soft tissues. You can either:

Add composite to create undercut

Create dimple preparation

Diagonal -> suitable for either type of clasp

25
Q

Describe the arm of an occlusal approaching clasp (2)

A

Terminal 1/3 of clasp arm engages with the undercut area (retentive)

Remaining 2/3 of clasp arm lies on or above the survey line (non-retentive)

26
Q

Describe the arm of a gingival approaching clasp (2)

A

Whole arm of clasp is beneath the survery line

Terminal tip is the only part that is in contact with tooth

27
Q

What is the function of the bracing component of the clasp? (4)

(green)

A

1) When the denture is placed under load -> retentive portion of clasp flexes

2) This will exert pressure on tooth -> possible movement of teeth

3) The bracing component counters this movement - action is known as reciprocation

4) This effect can also be provided by the non-retentive part of the clasp

28
Q

What materials are used for clasps? (4)

A

Gold - cast or wrought

Cobalt-chrome - cast or wrought (wiptam)

Stainless steel (SS) - wrought

Acetyl resin (dental D)

29
Q

What are the properties of acetyl resin (dental D) clasps? (5)

A

Flexible

Aesthetic (tooth coloured)

Brittle

Need to be thick in cross-section

Expensive

30
Q

How does the cross-section of occlusal and gingival approaching clasps differ?

A

Occlusal approaching - D-shape (flat surface against tooth) -> ↑ Rigid

Gingival approaching - O-shape (only tip in contact with tooth) -> ↑ Flexible

31
Q

Compare the flexibility (modulus of elasticity) of the different clasp materials (6)

(highest to lowest)

A

Wrought gold

Wrought S.S

Wrought Co-Cr

Cast gold

Cast Co-Cr

32
Q

What undercut gauge should be used for the different clasp materials (4)

A

Wrought gold -> 0.75mm

Wrought S.S -> 0.5mm

Wrought Co-Cr -> 0.5mm

Cast Co-Cr -> 0.25mm (occlusal approaching) + 0.5mm (gingival approaching)

33
Q

Why should you use a 0.25mm undercut gauge for occlusally approaching Co-Cr clasps that have mesial and distal occlusal rests? (2)

A

Addition of distal rest ↓ flexibility of clasp by 50%

Retentive arm becomes stiffer

PRS03 - Removable Partial Dentures (10 decks)

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