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CSB- SS sheets questions > Prosthetics SS > Flashcards

Prosthetics SS Flashcards

1
Q

how can a denture be supported

A

by teeth
by mucosa
from tooth and mucosa

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2
Q

describe tooth borne dentures

A

Resistance to downward direction is placed on the teeth supporting this denture
Teeth are compressible and move in the PDL & mucosa is not compressed on biting

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3
Q

describe mucosa borne dentures

A

Resistance to downward direction is placed on the mucosa supporting this denture
Mucosa is compressed upon biting & dentures sinks into the gum

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4
Q

describe tooth and mucosa borne dentures

A

The occlusal rest acts as tooth borne and the free end saddle acts as mucosa borne

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5
Q

how is support gained

A

cingulum
tooth rests
incisal rests sometimes and onlays

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6
Q

what does every denture need

A

at least 3mm gingival clearance

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7
Q

what is a spoon denture used as

A

Used as a temporary measure to replace a small number of teeth

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8
Q

what is a saddle

A

addle is an edentulous area of the alveolar ridge

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9
Q

what types of saddles can we have

A

bounded

or free ended

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10
Q

define the path of displacement

A

vertical force directed away from the mucosa

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11
Q

why might dentures be loose

A

lack of retention/ bracing/ support

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12
Q

what is the survey line of the tooth

A

the maximum bulbosity of the tooth

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13
Q

what are the types of clasps

A

gingival approaching

occlusally approaching

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14
Q

what is bracing

A

resistance to a horizontal force

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15
Q

what do reciprocating arms have two major functions

A

resists denture moving horizontally

prevents tooth being pushed into the PDL as the denture is taken in and out and the retentive arm

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16
Q

what is indirect retention

A

esistance to rotational displacement in a tooth and mucosa borne denture

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17
Q

how do we achieve indirect retention

A

achieved by placing a rest perpendicular to the terminal hinge axis

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18
Q

describe occlusal rests

A

Rests act giving the tooth support and keeping the clasps in position
Sit on tip of the tooth and extend up to 1/3 of the occlusal surface
They are saucer shaped to allow resistance (but some movement) when moving laterally
They act on the long axis of the tooth & are clear of the occlusion

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19
Q

what is the horizontal depth required for Co/Cr

A

0.25mm

20
Q

how does the clasp engage on the tooth

A

1/3 under the undercut

2/3 above the survey line

21
Q

which tooth can we clasp

A

molars

22
Q

how long does the clasp need to be

A

15mm

23
Q

when do we use the RPI system

A

free ended lower saddles

24
Q

what Kennedy class system is needed for RPI

A

for unilateral/bilateral free ended saddles

25
Q

what is Kennedy class 1

A

bilateral free end saddle

26
Q

what is Kennedy class 2

A

unilateral free end saddle

bounded saddle

27
Q

Kennedy class 3

A

bounded saddle

28
Q

what is Kennedy class 4

A

anterior bounded saddle

29
Q

what are the four principles of co/cr dentures

A
  1. Avoid gingival coverage as this promotes plaque accumulation
  2. Provide a denture with good support
  3. Make sure the connector is rigid to distribute the loads evenly
  4. Keep it simple stupid!
30
Q

what are the eight steps to co/cr dentures

A 
Saddles 
Support 
Retention
Bracing/ Reciprocation 
Guide planes
Connectors 
Review points of design 
Review principles of design
31
Q

how do we see which teeth to replace

A

aesthetics
masticatory forces
phonetics
prevention of drifitnt/overexfolatiation

32
Q

what are disadvantages of saddles

A

plaque accumulation
trauma
pt tolerance
cost

33
Q

where does the saddle extend to in the lower free end saddle

A

to the retromolar pad and the pear shaped pad

34
Q

what does the saddle extend to in the upper arch

A

hamular notch

35
Q

what is the RPI system

A

medial rest
distal guide plane
I bar

36
Q

what type of clasps do we have

A 
3 arm 
ring
I bar 
T bar 
L bar
37
Q

how do we create an undercut

A

using composite and the undercut must be 0.25mm

38
Q

name some connectors in the upper arch

A 
Anterior palatal bar
Mid palatal bar
Posterior palatal bar
Horse shoe
Palatal plate
Ring (not suitable for free end saddles as not enough coverage to spread load and create suction
39
Q

name some connectors in the lower arch

A 
lingual bar 
sublingual bar 
lingual plate 
dental bar 
buccal bar
40
Q

how much clearance do we need for a lingual bar

A

6mm minimum sulcus depth

41
Q

how much clearance do we need for a sublingual bar

A

7mm

42
Q

what are the ways to take an impression

A

muco displasie
muco satin
differential pressure
functional

43
Q

what technique do we use nowadays for impressions

A

relatively muco static

44
Q

why do we use relative much static

A

pt comfort

45
Q

disadvantages of muco static

A

no border moulding

CSB- SS sheets questions (4 decks)

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