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2 - Prosthodontics (Removable) > System Of Design > Flashcards

System Of Design Flashcards

1
Q

What are the alternatives treatments to partial dentures?

A

No treatment
Conventional bridge
Resin-bonded (Maryland) bridge
Implants retained prostheses

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2
Q

What GDC standard is important when informing patient?

A

Montgomery consent - 2.2

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3
Q

Why do clinicians design the denture and not technicians?

A

We have seen the patient:

Patient story & expectations
Condition of teeth & periodontium/oral health
Assessment of current dentures (if any)
Assessment of occlusion
More complete understanding of alternatives
To give clear cost information (GDC Standard 2.4)

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4
Q

What are the key principles of partial denture design

A

Replace lost teeth & tissues, restoring function, speech, & aesthetics
Minimize damage to adjacent teeth, restorations & tissues
Designed with periodontal health in mind

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5
Q

What are the components of a CrCo partial denture?

A

Major Connector (lingual bar) – connects parts

Cingulum rest (Support & indirect retention)

Acrylic tooth restoring natural tooth

Pink acrylic restoring lost mucosa & bone

Occlusal rest (Support)

(Ring) clasp (Retention)

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6
Q

What do the rests aim to do?

A

Avoid denture sinking into tissue

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7
Q

What do clasps engage in?

A

The undercut of the tooth

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8
Q

What is a saddle?

A

An area of oral mucosa where teeth are being replaced

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9
Q

What is craddock class 4? (added later)

A

Implant borne

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10
Q

What is craddock class 5? (added later)

A

Implant and mucosa borne

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11
Q

What is the craddock claddification?

A

Classifies how the saddle is loaded

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12
Q

What is Kennedy classification?

A

Classifies by position of saddles

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13
Q

What is Kennedy class 3?

A

Single bounded saddle not crossing the midline

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14
Q

What is Kennedy class 4?

A

Single bounded saddle crossing the midline

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15
Q

What happens if there is more than 1 edentulous saddle present?

A

Modifications
Use the most posterior saddle to define the main Kennedy classification

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16
Q

What does modification 1 mean?

A

One other saddle present

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17
Q

What class cannot be the main class if there is a modification?

A

Class 4 as any modification will be posterior to the midline

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18
Q

What is PEEK?

A

Poly ether ether ketone
Alternative to CoCr
Thin and strong
Expensive
Used for allergies to metal

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19
Q

What is flexible denture material made off?

A

Nylon
Very bad (porous)

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20
Q

Why is gold not used?

A

Expensive

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21
Q

What does a major connector connect?

A

Connects all the components

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22
Q

What do minor connectors connect?

A

Rests, clasps and bracing arms

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23
Q

What are the common mandibular major connectors?

A

Acrylic plate
Lingual bar
Lingual plate

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24
Q

What are the common maxillary major connectors?

A

Acrylic plate
Mid palatial bar/ strap
Anterior palatial bar (horseshoe)
Ring

25
Q

Why is a lingual bar good?

A

Not close to teeth therefore good for PD tissues

26
Q

Why is a lingual plate good?

A

Prevents rocking
good for space <8mm
Splints pd anterior teeth

27
Q

Why should the denture be surveyed? (I.e. surveyor or digital surveying)

A

Help us choose retentive elements (clasps)
Path of insertion (and removal) of denture

28
Q

What is retention?

A

Resistance of the denture to vertical displacement (lifting away from the tissues)

29
Q

What method is used for retention?

A

Clasps

30
Q

What is indirect retention?

A

Resistance to rotational displacement around a fulcrum axis

*fulcrum axis = the line of rotation – it is an imaginary line between the most posterior rest seats on the end of each arch

31
Q

What classes is indirect retention seen mostly?

A

Class 1 and 2

32
Q

What components give indirect rentention?

A

Occlusal and incisal rests
Connectors

33
Q

What is used to give support?

A

Occlusal rests
Cingular rests
Incisal rests

34
Q

What must sometimes happen for rests to be inserted? And what happens if there is inadequate support?

A

Sometimes we must prepare rests seats with a drill as we have insufficient occlusal space for a rest

Inadequate support: denture sinks into the tissues and traumatizes them

35
Q

What does a high arched palate provide?

A

Better horizontal resistance

36
Q

What is reciprocation of dentures?

A

Reciprocal arm of clasp prevents movement of clasped tooth

37
Q

What is given to the technician regarding the denture?

A

The design sheet which you have provided

38
Q

What should the width of a mid palatial bar be between?

A

7-12mm

39
Q

What are the steps of designing as denture?

A

Consider;
1. Saddle(s)
2. Support
3. Retention
4. Indirect retention
5. Bracing
6. Connectors
7. Review & simplify

40
Q

What is support?

A

“The resistance of the denture to occlusally directed load”
Resist movement TOWARDS the soft tissues, (vertical downwards)

Craddock classifications

41
Q

What type of saddle has a craddock class 3?

A

free end saddle

42
Q

What type of saddle has a craddock class 1?

A

bounded

43
Q

Where should support (rests) be placed in a RPD?

A

as close as possible to a bounded saddle

on the mesial side of the abutment in a free-end saddle

44
Q

What will happen if the rest is placed distally?

A

the tooth will want to tilt distally

45
Q

When preparing an anterior tooth clasp what can be used instead of cutting tooth?

A

add composite instead

46
Q

Why are incisal rests less common now?

A

due to apperance

47
Q

What are the methods of direct retention?

A
  • Clasps
  • Soft tissue undercuts
  • Adhesion (maxillary plates)
  • Friction
  • Path of insertion
    muscle control
48
Q

Why should the extension of the saddle have the max surface area possible?

A

increasing the footprint of the saddle and spreading the load more widely

49
Q

In what pattern should the clasps be placed to increase max retention?

A

triangular

50
Q

What is the RPI system and why is it used?

A

Type of Clasp.

Allows the free saddle to rotate slightly without damaging the soft tissues or abutment tooth

51
Q

What does bracing/reciprocation aim to do?

what are they both provided by?

A

bracing - resistance against horizontal displacing forces acting on the denture base provided by major connectors and flanges

reciprocation - counteracts the tipping forces created by the clasps during denture placement and removal. provided by reciprocal clasp arm and connectors

52
Q

What plate materials can be used?

A

PMMA
CoCr

53
Q

What are the saddle choices?

A

flanged (flange goes directly into sulcus)
gum-fitted/ open-face

54
Q

What are the disadvantages to each saddle choice?

A

flanged
if taking out many teeth, the buccal plate may fracture

gum-fitted
no retention from sulcus
difficult to clean
any alveolar resorption leaves a space

55
Q

In partial denture construction a pin dam improves…

A

improves adaptation to underlying tissues

56
Q

What is the minimum length of a CoCr occlusally approaching clasp?

A

15mm

57
Q

The RPI is a stress relieving clasp system that works by

A

eliminating axial rotation (torque) from the distal of the abutment tooth

58
Q

What is the distance for a mandibular lingual bar indicated?

A

at least 8mm from the floor of the mouth to the gingival margin

2 - Prosthodontics (Removable) (16 decks)

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