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REMOVABLE PROSTH > RPD Lecture 1 > Flashcards

RPD Lecture 1 Flashcards

1
Q

what is the most common reason for PRDP?

A

age factor! usually posteriors go first

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2
Q

is the proportion of edentulous adults in the US increasing or decreasing?

A

decreasing for sure…
13% of the population in the US is 65 % or older. this number is expected to double by 2030
**so this means that the projected unmet needs for FDPs, PRDPs and implants will increase between 2005 and 2020

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3
Q

what is the metal framework composed of?

A

cobalt chrome

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4
Q

what is the purpose of the reciprocal arm?

A

it’s for support and stability

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5
Q

what is the kennedy classification of partially edentulous arches based on?

A

the frequency of observation in a patient population

and the suggested design principles.

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6
Q

describe kennedy class I

A

it’s a BILATERAL edentulous located posterior to the natural teeth
MOST COMMON

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7
Q

describe class Kennedy Class II?

A

it’s a unilateral edentulous area located posterior to the remaining teeth

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8
Q

describe kennedy class III?

A

a unilateral edentulous area with natural teeth ANTERIOR and POSTERIOR to it

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9
Q

this class is bound on BOTH sides by abutment teeth?

A

class III

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10
Q

describe kennedy class IV?

A

a single, bilateral (crosses midline) edentulous area located ANTERIOR to the remaining teeth

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11
Q

what are class IV generally caused by?

A

trauma.
*must cross midline to be a class IV
anteriors

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12
Q

what dicates the path of insertion for removable?

A

the TEETH

external surfaces of the teeth and their relationship (parallelism to each other)

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13
Q

what is the INFRABULGE?

A

that’s what is apical to the survey line-

that’s where we place the RETAINING cusp to resist VERTICAL displacement.

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14
Q

infrabulge resists what?

A

vertical displacement.

it’s for retention

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15
Q

does the supra bulge help with retention?

A

no, just to brace to tooth

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16
Q

what kind of forces does the supra bulge resist?

A

lateral stresses on abutment tooth

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17
Q

frictional forces that increase the PRDP retention, help control stress, and define the path of insertion?

A

guide plane/plates

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18
Q

because these have destrutvie potential during rotation of the PRDP, in most cases, use them sparingly to reduce stress?

A

claps

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19
Q

what’s the most favored clasp position?

A

quadrilateral- super stress reducer.

all occlusal forces are supported by the abutment teeth.

20
Q

what classifications allow to use quadrilateral support?

A

Kennedy III and IV

21
Q

chewing efficiency of quadrilateral?

A

30%

22
Q

what class is associated with Kennedy II?

A

tripod.

place cusps on dentate side as far away as possible.

23
Q

what is the worst clasp position?

A

bilateral.
unavoidalbe in conventional PRDP design.
use for Kennedy I mods/no mods

24
Q

what kind of undercut to most retentive clasps use?

A

.01 undercut apical to the survey line

25
Q

resistance to displacement towards teeth and soft tissue

A

support

26
Q

resistance to displacement in a mediolateral or anteroposterior direction.

A

stability

27
Q

what does occlusion depend on?

A

the type (canine protected, group function, or bilaterally balanced) depends on the opposing occlusion

28
Q

what is the purpose of surveying?

A

it determines what tooth mods will be needed to facilitate the design
USES surveyor and the DIAGNOSTIC casts

29
Q

what is the instrument called that measures the path of insertion with the surveyor?

A

the STYLUS

30
Q

what does the PATH of placement identify?

A

it will eliminate or minimize interference upon insertion and removal.
it will identify interferences that cannot be eliminated or minimized without corrective action

31
Q

are ALL proximal surfaces adjacent to the edentulous spaces involved in path of placement?

A

yes, IN GENERAL

32
Q

where the horizontal disc meets the tooth surface and the barrel is tangent to the survey line?

A

that’s the .01 mid facial undercut

33
Q

what is TRIPODING or INDEXING?

A

this si to record the cast position in relation to the path of insertion. So that we can see this anywhere in the world?
**3 points is the most stable

34
Q

what are advantages of using Kennedy’s classes?

A
  • immediate visualization of the arch
  • distingushies between tooth and tooth/soft tissue supported PRDPs.
  • permits a logical approach to design.
35
Q

RULE 1 APPELLATE

do you classify before or after extraction?

A

after duh.

36
Q

if a third molar is missing, is it considered in the classification?

A

NOPE

37
Q

if a third molar is PRESENT and to be used as an abutment, do we consider it/

A

makes sense-duh

38
Q

what happens if a second molar is missing and not to be replaced?

A

don’t include it

39
Q

what is RULE 5!?!? of applegate

A

the most POSTERIOR edentulous area or areas always determines the classification

40
Q

what do you call edentulous areas other than those determining the classification?

A

those are MODIFICAITONS and designated by the absolute number observed.
Class II with 2 mod spaces

41
Q

is the extent of the modification considered?

A

NO, just the absolute number of additional edentulous areas.

42
Q

What class Kennedy has no mods?

A 
class IV
because of rule 5? the posterior rule?
43
Q

do the mods change depending on how many teeth missing?

A

nope

44
Q

what does length os span have to do with abutment teeth force?

A

the greater the edentulous span, the greater to force to the abutment teeth

45
Q

what is the best Ridge shape?

A

inverted U

size = you want large in height and width

46
Q

what determines the clasp and stress?

A

so with clasps, the longer and more flexible= less stress

47
Q

what metals are more rigid than gold?

A

base metals.

REMOVABLE PROSTH (18 decks)

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