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BDS2 CDS Prosthodontics Removable > RPD - Design and Construction > Flashcards

RPD - Design and Construction Flashcards

1
Q

articulator

A

a hinged instrument to which the maxillary and mandibular casts are attached and which reproduces recorded relationships of the mandible to the maxilla
- assist the study of occlusion and the formation of the occlusal surfaces of prostheses and restorations

different types

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2
Q

surveyor

A

instrument used to survey casts
- may also be used to prepare parallel surfaces on restorations

drive the design for partial denttures
OSCE station

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3
Q

6 reasons why patients can have missing teeth

A
  • caries (tooth decay
  • periodontal disease (gum disease)
  • endodontic infection
  • trauma
  • cancer
  • congenitally absent (hypodontia)
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4
Q

4 consequences of missing teeth

A
  • anatomical
  • aesthetic
  • functional
  • psychological
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5
Q

what are the extra oral anatomical consequences of missing teeth?

A

change in facial appearance

  • maxilla shrinks backwards
  • mandible goes forwards
  • exaggerate class 3

TMJ problems

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6
Q

what are the intra oral anatomical consequences of missing teeth?

A
  • alveolar resorption
  • tooth movement
  • tooth wear
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7
Q

what is a term used for unwanted tooth movement due to missing teeth?

A

drifting

tiliting

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8
Q

how can aesthetics be effected by missing teeth?

A

loss of hard and soft tissue which support the face

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9
Q

how can function be effected by missing teeth?

A

mastication

speech

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10
Q

what is the most difficult thing for dentists to manage in regards to patients missing teeth?

A

the psychological effect

  • mental health
  • effect quality of life
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11
Q

7 ways we can replace missing teeth

A
  • Resin bonded bridgework
  • Conventional bridgework
  • Implant crowns
  • Implant bridgework
  • Removable partial dentures
  • Complete dentures
  • Implant retained dentures
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12
Q

describe resin bonded bridgework

A

mesial cantilever is the most successful (abutment teeth on both sides of pontic)

fixed-fixed

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13
Q

descrive conventional bridgework

A

cantilever

fixed-fixed

need to do a lot of preparation
- more destructive
retainers usually metal ceramic crowns

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14
Q

what is the preferred method of placing an implant crown?

A

with a screw rather than cement

- can remove easier if something goes wrong

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15
Q

what is implant bridgework?

A

similar to conventional bridgework apart from use implant screws on abutments rather than retainer clasps

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16
Q

removable complete denture

A

conventional denture

  • no attachments for stability
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17
Q

implant retained complete denture

A

abutments are attached to implants to be attached

- ‘snaps in place’

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18
Q

implant supported complete denture

A

screw retained and removable

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19
Q

what does ‘saddle’ mean?

A

area with no teeth

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20
Q

bi-lateral free-end saddle

A

anterior teeth only, no posterior teeth on either side

21
Q

uni lateral free-end saddle

A

anterior teeth and one side of posterior teeth present

22
Q

bounded saddle

A

gap in running row of teeth

e.g. between canine and molar (missing premolars); between canines

23
Q

do we replaces all missing teeth?

A

no

depends on ones missing (need 20 teeth according to WHO)

24
Q

shortened dental arch

A

A dentition where most posterior teeth are missing
- Satisfactory oral function without use of RPD

Priority given to maintaining an anterior and premolar dentition in one or both jaws
- In the right circumstances, non-replacement of posterior missing teeth can provide a stable and acceptable dentition

25
Q

3 ways to extend the shortened dental arch

A

bridgework

implants

RPD

26
Q

what are the 3 classes of support a removable partial denture can have?

A
  • tooth borne
  • mucosa borne
  • tooth and mucosa borne
27
Q

what is tooth borne support?

A

everything rests on teeth (no free end saddle)

desirable

28
Q

what is mucosa borne support?

A

everything rests on mucosa

29
Q

what is tooth and mucosa borne support?

A

mixture of retainers on teeth and RPD resting on mucosa

30
Q

what type of material (base) can you get for an RPD?

A
  • acrylic

- cobalt chrome

31
Q

what are the 5 stages in patient assessment?

A
  • history
  • examination
  • special investigations
  • diagnosis
  • treatment plan
32
Q

what do you need to get when taking patient’s history for RPD?

A

Full denture history
- Why were teeth lost? How long have they worn dentures for? How many dentures have they had? Have they got a favourite denture? Previous denture causing problems? Have they got a preferred design? Which do they prefer -metal or acrylic resin denture?Periodontal disease? (Means ridges going to change)

Medical history
- particularly identify problems which could affect treatment; Arthritis, Neuromuscular, Mucosal disease, Xerostomia (denture may not stay inn well, uncomfy), Osteoporosis/bisphosphonates

Social history
- esp hobbies - wind instruments

33
Q

extra oral points to look for in the RPD patient examination

A
  • Lower facial height - Too short dentures would mean lower facial height reduced
  • Nasio-labial angle
  • Limited Opening
  • Any abnormalities
  • Smile line
  • Aesthetics of existing dentures
34
Q

intra oral points to look for in the RPD patient examination

A

General Examination

  • Periodontal status
  • Endodontic status
  • Caries
  • Tooth wear
  • Indirect restorations

Edentulous spaces

  • Number
  • Position
  • Length
  • Ridge form
  • Displaceable tissue

Occlusion

  • Occlusal vertical Dimension
  • Occlusal contacts
  • Freeway Space
35
Q

kennedy class I

A

bilateral free end saddle

e.g. only 4 to 4 present

36
Q

kennedy class II

A

unilateral free end saddle

missing one side of posteriors

37
Q

kennedy class III

A

uni lateral bounded saddle

missing some posterior teeth on one side but have the 7 or 8

38
Q

kennedy class IV

A

anterior bounded saddle

missing incisors

39
Q

craddock class I

A

Saddles supported on both sides by substantial abutments

All tooth borne

40
Q

craddock class II

A

Vertical biting forces resisted entirely by soft tissues

All mucosa borne

41
Q

craddock class III

A

Tooth supported at only one end of the saddle

Tooth and mucosa borne

42
Q

9 points to look at in denture examination

A
  • Support -The resistance to vertical movement of the denture towards the tissue
    (too supported teeth resist movement)
  • Retention - The resistance to displacement of the denture away from the tissue
  • Stability -The resistance to horizontal (lateral) movement of the denture
    (Is occlusion meeting directly)
  • Aesthetics - Primary for patients
  • Extension - How far denture base extends
  • Occlusion -bite
  • Material
  • Design
  • Condition of teeth and base- How long in at a time and age of denture – assess teeth wear, fractures of denture
43
Q

what is denture support?

A

The resistance to vertical movement of the denture towards the tissue

Too supported teeth resist movement

44
Q

what is denture retention?

A

The resistance to displacement of the denture away from the tissue

45
Q

denture stomatitis

A

mixed bacteria and yeast infection

can occur if wear denture overnight

asymptotic infection if mild
- can cause chest infection

46
Q

abutments teeth requirements

A
  • structurally sound, with satisfactory appearance (Really strong teeth either side to make bridge, Need to pick best condition teeth as additional forces on them)
  • in good alignment and position
  • any previous restorations and endodontic treatments are satisfactory
  • tooth roots and supporting alveolar bone are adequate (You don’t want to use teeth with bone loss. No RCT, need good bone support)
  • soft tissue of the edentulous ridge is satisfactory in quantity and quality
47
Q

what special investigations need to be undertaken for abutment teeth? (4)

A
  • Periapical radiographs
  • Sensibility testing – blood and nerve supply (EPT, Ethyl chloride)
  • Surveyed study models
  • Clinical photographs
48
Q

what is denture over extensions

A

too much material

49
Q

what is under extension of denture

A

palate or flanges are too shallow which causes air to undermine the denture, therefore, it drops or has excessive movement.

Under extension can also cause a gagging sensation.

BDS2 CDS Prosthodontics Removable (10 decks)

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