Intro to Partials Flashcards

1
Q

Kennedy class I

A

Bilateral distal extension

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2
Q

Kennedy class II

A

unilateral distal extension

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3
Q

Kennedy class III

A

unilateral tooth borne

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4
Q

Kennedy class IV

A

bilateral tooth born

  • space must cross mid-line with no additional teeth missing for KC IV
  • NEVER has modification space and ALWAYS crosses mid-line
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5
Q

all guide planes are…

A

minor connectors

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6
Q

T/F all minor connectors are guide planes

A

FALSE

- BUT all guide planes are minor connectors

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7
Q

path of insertion for removable abutments vs fixed

A
  1. identical (everywhere in arch)
  2. Guiding
  3. External
  4. Done by ‘surveying’

FIXED

  1. similar
  2. non-interfering
  3. internal
  4. done by eye (in the mouth)
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8
Q

guide planes determine

A
  1. path of insertion and withdrawl
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9
Q

path of insertion determines

A

height of contour

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10
Q

height of contour determines

A

location of undercuts

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11
Q

rests in function

A

stop GINGIVAL MOVEMENT

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12
Q

CLASPS in funciton

A

stop OCCLUSAL MOVEMENT

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13
Q

difference between cast partial and provisional partial

A

provisionals have no rests, no guide planes, no major connectors (cast partials do )

may or may not have wire claps

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14
Q

indications for removable partials

A
  1. distal extension
  2. long tooth borne span
  3. severe bone loss
  4. recent extraction
  5. high caries index
  6. poor crown/root ratio
  7. cost
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15
Q

all guide planes are?

A

minor connectors

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16
Q

we classify partials by?

A

the MOST POSTERIOR SPACE to be RESTORED by the partial

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17
Q

we modify partials by?

A

the number of REMAINING spaced to be RESTORED by the partial

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18
Q

rules for kennedy class IV

A

NEVER has modification spaces and ALWAYS crosses midline

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19
Q

kennedy classification DETERMINED BY

A

occlusal analysis

- why we MOUNT our cases

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20
Q

two types of partial denture movement

A
  1. vertical

2. rotational

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21
Q

tooth borne movement

22
Q

distal extension movement

A

rotational

  • down ward
  • up ward
23
Q

will a class III mod 1 rotate

A

likely not - but not a definitie answer if a hard yes or no choose no

24
Q

what defines the axis of rotation?

A

the two most posterior rests

25
tooth borne class IV rotation implication?
if restoring a lot then absolutley will back two define axis of rotation
26
tooth borne class III and IV with rotation are termed what?
MESIAL extensions
27
when are you more likely to have anterior rotation?
when pt. does not have cuspids/ canines and these need restoring as well
28
what does rotation depend upon?
the size of the anterior-posterior space
29
retention can be what two forms?
1. direct | 2. indirect
30
what keeps the denture down?
retention
31
direct retention prevents?
prevents VERTICAL MOVEMENT
32
Indirect retention prevents?
rotational movement
33
what does direct retention use to prevent vertical movement?
CLAPS
34
what does indirect retention use to prevent rotational movement?
RESTS | - think R and R (rests for rotation)
35
direct retainer aka
clasp
36
clasp assembly
1. rest 2. retainer (crosses height of contour and in undercut area) 3. bracer (oppsoite and above height of contour)
37
absence of a bracer will cause what?
tooth movement so the bracer is there to prevent tooth movement as clasp crosses the bulge
38
three types of rotation
1. Antero-posterior (front to back) 2. lateral (side to side) 3. horizontal (twisting)
39
how many axes of rotation? what are they
three 1. A/P 2. Lateral = midline of arch 3. H = perpendicular to center of arch
40
A/P line =
line connecting last 2 rests and determines the A/P (front to back rotation)
41
where is the horizontal and lateral axes of rotaitno?
laterl = midline Horizontal = perpendicular to center of arch
42
indirect retention opposes what type of rotation?
A/P rotation
43
what happens as denture base lifts away from tissue?
an OPPOSING REST SEATS against the tooth
44
describe indirect retention
during rotation the INDIRECT RETAINERS (rests) seat and prevent lifting of the distal extension
45
how to locate the indirect retainer
1. locate the most posterior rests on each side 2. connect them for form the axis of rotatin 3. locate the midpoint of the axis 4. locate the tooth PERPENDICULAR to the midpoint 5. place a rest on that tooth OR MOVE LATERALLY to the nearest acceptable tooth (no incisors)
46
which teeth cannot be indirect retainers?
central incisors | - so move laterally to cuspids
47
how many indirect retainers do you uses? What does it depend on?
1 or 2 and depends on SYMMETRY
48
describe the relationship of effectiveness of the indirect retainer
it DECREASES as the distance from the axis of rotation DECREASES
49
where do we not place guide planes
on incisors and the MESIAL aspect canines * because of esthetic reasons
50
symmetry is for what two things
rest and clasp
51
ante's rule
If space is small enough for a bridge, use 1 clasp if space is too large for a bridge, use 2 clasps