Intro to Partials

Question 1

Kennedy class I

Answer 1

Bilateral distal extension

Question 2

Kennedy class II

Answer 2

unilateral distal extension

Question 3

Kennedy class III

Answer 3

unilateral tooth borne

Question 4

Kennedy class IV

Answer 4

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

Question 5

all guide planes are…

Answer 5

minor connectors

Question 6

T/F all minor connectors are guide planes

Answer 6

FALSE

- BUT all guide planes are minor connectors

Question 7

path of insertion for removable abutments vs fixed

Answer 7

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)

Question 8

guide planes determine

Answer 8

1. path of insertion and withdrawl

Question 9

path of insertion determines

Answer 9

height of contour

Question 10

height of contour determines

Answer 10

location of undercuts

Question 11

rests in function

Answer 11

stop GINGIVAL MOVEMENT

Question 12

CLASPS in funciton

Answer 12

stop OCCLUSAL MOVEMENT

Question 13

difference between cast partial and provisional partial

Answer 13

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

may or may not have wire claps

Question 14

indications for removable partials

Answer 14

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

Question 15

all guide planes are?

Answer 15

minor connectors

Question 16

we classify partials by?

Answer 16

the MOST POSTERIOR SPACE to be RESTORED by the partial

Question 17

we modify partials by?

Answer 17

the number of REMAINING spaced to be RESTORED by the partial

Question 18

rules for kennedy class IV

Answer 18

NEVER has modification spaces and ALWAYS crosses midline

Question 19

kennedy classification DETERMINED BY

Answer 19

occlusal analysis

- why we MOUNT our cases

Question 20

two types of partial denture movement

Answer 20

1. vertical

2. rotational

Question 21

tooth borne movement

Answer 21

vertical

Question 22

distal extension movement

Answer 22

rotational

• down ward
• up ward

Question 23

will a class III mod 1 rotate

Answer 23

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

Question 24

what defines the axis of rotation?

Answer 24

the two most posterior rests

Question 25

tooth borne class IV rotation implication?

Answer 25

if restoring a lot then absolutley will

back two define axis of rotation

Question 26

tooth borne class III and IV with rotation are termed what?

Answer 26

MESIAL extensions

Question 27

when are you more likely to have anterior rotation?

Answer 27

when pt. does not have cuspids/ canines and these need restoring as well

Question 28

what does rotation depend upon?

Answer 28

the size of the anterior-posterior space

Question 29

retention can be what two forms?

Answer 29

1. direct

2. indirect

Question 30

what keeps the denture down?

Answer 30

retention

Question 31

direct retention prevents?

Answer 31

prevents VERTICAL MOVEMENT

Question 32

Indirect retention prevents?

Answer 32

rotational movement

Question 33

what does direct retention use to prevent vertical movement?

Answer 33

CLAPS

Question 34

what does indirect retention use to prevent rotational movement?

Answer 34

RESTS

- think R and R (rests for rotation)

Question 35

direct retainer aka

Answer 35

clasp

Question 36

clasp assembly

Answer 36

1. rest
2. retainer (crosses height of contour and in undercut area)
3. bracer (oppsoite and above height of contour)

Question 37

absence of a bracer will cause what?

Answer 37

tooth movement

so the bracer is there to prevent tooth movement as clasp crosses the bulge

Question 38

three types of rotation

Answer 38

1. Antero-posterior (front to back)
2. lateral (side to side)
3. horizontal (twisting)

Question 39

how many axes of rotation? what are they

Answer 39

three
1. A/P

2. Lateral = midline of arch
3. H = perpendicular to center of arch

Question 40

A/P line =

Answer 40

line connecting last 2 rests and determines the A/P (front to back rotation)

Question 41

where is the horizontal and lateral axes of rotaitno?

Answer 41

laterl = midline

Horizontal = perpendicular to center of arch

Question 42

indirect retention opposes what type of rotation?

Answer 42

A/P rotation

Question 43

what happens as denture base lifts away from tissue?

Answer 43

an OPPOSING REST SEATS against the tooth

Question 44

describe indirect retention

Answer 44

during rotation the INDIRECT RETAINERS (rests) seat and prevent lifting of the distal extension

Question 45

how to locate the indirect retainer

Answer 45

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)

Question 46

which teeth cannot be indirect retainers?

Answer 46

central incisors

- so move laterally to cuspids

Question 47

how many indirect retainers do you uses? What does it depend on?

Answer 47

1 or 2 and depends on SYMMETRY

Question 48

describe the relationship of effectiveness of the indirect retainer

Answer 48

it DECREASES as the distance from the axis of rotation DECREASES

Question 49

where do we not place guide planes

Answer 49

on incisors and the MESIAL aspect canines

• because of esthetic reasons

Question 50

symmetry is for what two things

Answer 50

rest and clasp

Question 51

ante’s rule

Answer 51

If space is small enough for a bridge, use 1 clasp

if space is too large for a bridge, use 2 clasps