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142 - RPD > Components of RPD > Flashcards

Components of RPD Flashcards

1
Q

two types of surfaces of rpd

A

polished surface
-external surface

tissue surface
-inner surface

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1
Q

type of denture teeth not recommended

A

porcelain
-very high abrasion resistance

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2
Q

types of material for denture teeth

A

-porcelain
-acrylic resin
-metal
-composite hybrids

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3
Q

standard material used for denture base

A

polymethyl methacrylate (PMMA)

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4
Q

common types of METAL framework

A

cobalt-chromium
nickel-chromium
gold alloy
titanium

most widely used cobalt-chromium

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5
Q

common types of NON-METAL framework

A

polyoxymethylene (POM)
polyamide/nylons
polyaryletherketone polymers (PAEK
-aryl ketone polymers (AKP)
-polyetherketone (PEEK)

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6
Q

process of metal framework fabrication

A

diagnostic cast -> fabricate custom tray -> perform final impression making -> master cast -> duplicate cast -> make preps on cast -> refractory cast -> wax pattern -> casting

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7
Q

parts of metal framework

A

major connector
minor connector
proximal plates
finishing lines
acrylic retention areas
rests
clasps/retainers

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8
Q

3 functional requirements

A

support (tissueward)
stability (side-to-side)
retention (away from mucosa)

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9
Q

thickness, width, and length to achieve rigid metal

A

thick, wide, short

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10
Q

modification on surface of metal that adds rigidity

A

corrugation/stippling

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11
Q

shape, width, thickness, and location of palatal bar

A

tear drop shape, 4-6mm width anteroposterior, 2-3mm thickness, mid palatal region

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12
Q

type of palatal bar that is combination of anterior and posterior bar, and indication

A

antero-posterior bar

-to avoid prominences
-less metal coverage

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13
Q

shape, width, thickness, and location of palatal strap

A

flat with a thick part, 8-12mm (can be wider but not narrower, 1.5mm on thickest portion 1mm on other parts, classified based on location

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14
Q

indication for palatal plate

A

if 8mm width of strap cannot be reached

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15
Q

stress breaking maxillary major connector

A

split maxillary major connector

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16
Q

clearance of maxillary connector from gingival margin

A

4-6mm

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17
Q

done to maxillary major connector to establish intimate contact with mucosa

A

beading

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18
Q

posterior border of maxillary major connector should not go beyond ___

A

vibrating line

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19
Q

T/F all major connectors should be polished

A

F maxillary major connector should not be polished

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20
Q

clearance of mandibular connector from gingival margin

A

3-4mm

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21
Q

component that provides stress bearing ability for mucosa

A

keratin

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22
Q

required functional depth for mandibular major connector

A

> = 7mm

clearance from major connector to gingival margin = 3-4mm
width of major connector = 4mm

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23
Q

T/F just like the maxi major connector, tissue side of mandi major connector should not be highly polished

A

F, should be to reduce accumulation of plaque

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24
Q

T/F just like the maxi major connector, mandi major connector should be in intimate contact with mucosa

A

F, need to have relief because no stress bearing area in lingual surface

(not applicable kapag bungi)

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25
Q

shape, width, thickness, and location of lingual bar

A

tear-drop (thick part sulcular, thin part gingival), 1.5mm, 4mm, 3-4mm away from gingiva

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26
Q

design used for mandibular major connector if functional depth is <7mm

A

linguoplate

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27
Q

characteristics of linguoplate

A

scallop-shaped
comes in contact short of cingulum
splinting effect (debatable)
need rests adjacent to plate (avoid slippage)

28
Q

characteristic of mandi major connector integrated for patients with diastema

A

interrupted plate

29
Q

type of mandi major connector when linguoplate is choice, but teeth are too far apart (tilted

A

continuous bar
(superior border in contact like plate, middle area is open to have benefits of bar)

30
Q

modification of continuous bar where there is not enough clearance from gingival margin

A

dental bar

31
Q

type of lingual bar that goes under the tongue and is oriented horizontally (lying down on sulcus)

A

sublingual bar

32
Q

combination of lingual and labial bar and is used when only incisors remain

A

swing lock

33
Q

stress breaking mandibular major connector

A

split mandibular major connector

34
Q

connects the major connector to the peripheral components

A

minor connector/truss arms

35
Q

definition of load in prostho

A

resistance to penetration of denture teeth to bolus of food during mastication

36
Q

minimum thickness at junction for minor connector with rest

A

base metal: 1.5mm
titanium: 1.5mm
gold: 2.0mm

37
Q

dimension of guide planes

A

2-3mm wide occlusogingivally

38
Q

role of acrylic base

A

support
stability
replacement of lost bone and soft tissue
bind tooth to framework

39
Q

what is the finishing line

A

clean transition between metal and base

40
Q

function of tissue stop

A

maintains proper orientation of framework on cast during try-ins

41
Q

types of acrylic retention areas

A

-meshwork/ridge (interlaced thin strips of metal, should extend 1/3 to 1/2 of edentulous space)
-open lattice (highly resorbed ridges, larger spaces for more acrylic)
-posts/pins (very small edentulous spaces

42
Q

vertical vs horizontal external finishing lines

A

vertically oriented - for free end bases, whole distal extension made of acrylic, has flange (extension of base towards buccal and labial/palatal)
horizontally oriented - proximal plate continuous with finishing line, limited coverage

43
Q

why must external and internal finish line not coincide

A

for bulk and greater strength

44
Q

types of rests

A

occlusal
incisal
lingual
onlay

45
Q

width of occlusal rest

A

1/3 of tooth buccolingually, 1/2 intercuspal

wider base to reinforce junction and attach to rest

46
Q

clearance of occlusal rest to marginal ridge

A

1.5-2mm

47
Q

shape of floor of occlusal rest

A

spoon-shaped

48
Q

thickness of rest at deepest part

A

1-1.5mm

use #4 round bur

49
Q

walls of rest seat are sloping to accommodate minimal movements that dissipate stress called

A

play

50
Q

indication for onlay rest

A

tilted teeth
infraerupted teeth

51
Q

outline form of incisal rest

A

saddle-shaped

52
Q

cingulum rest are mainly placed on these teeth only

A

maxi canines

53
Q

parts of clasp

A

retentive component
reciprocating component
rest

54
Q

advantage of c-clasp over i-bar

A

bracing/stability

55
Q

advantage of i-bar over c-clasp

A

superior retention

56
Q

description for how retentive arm engages undercut

A

dragging action

57
Q

parts of retentive arm

A

rigid thirds - thickest and widest, at suprabulge
semi-rigid - crosses survey line
flexible third - engages undercut/below survey line

58
Q

purpose of reciprocal arm

A

-while the retentive arm is flexing, the reciprocal arm
should resist the pushing action
-above survey line
-rigid, not tapering

59
Q

required vertical clearance for gingivally approaching clasp

A

5mm

60
Q

why does i-bar have to originate one tooth away

A

for flexibility

61
Q

minimum encirclement of clasp

A

180 degrees + 1 degree minimum

62
Q

which components are direct retainers

A

clasps

63
Q

which components are indirect retainers

A

rests
denture bases

64
Q

what causes creation of fulcrum lines

A

rests

65
Q

most favorable placement of undercut

A

junction of middle and gingival third

66
Q

most favorable placement of reciprocal arm

A

middle third

67
Q

6 principles of clasp design (RSSREP)

A

retention
stability
support
reciprocation
encirclement
passivity

142 - RPD (7 decks)

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