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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
T/F just like the maxi major connector, mandi major connector should be in intimate contact with mucosa
F, need to have relief because no stress bearing area in lingual surface (not applicable kapag bungi)
25
shape, width, thickness, and location of lingual bar
tear-drop (thick part sulcular, thin part gingival), 1.5mm, 4mm, 3-4mm away from gingiva
26
design used for mandibular major connector if functional depth is <7mm
linguoplate
27
characteristics of linguoplate
scallop-shaped comes in contact short of cingulum splinting effect (debatable) need rests adjacent to plate (avoid slippage)
28
characteristic of mandi major connector integrated for patients with diastema
interrupted plate
29
type of mandi major connector when linguoplate is choice, but teeth are too far apart (tilted
continuous bar (superior border in contact like plate, middle area is open to have benefits of bar)
30
modification of continuous bar where there is not enough clearance from gingival margin
dental bar
31
type of lingual bar that goes under the tongue and is oriented horizontally (lying down on sulcus)
sublingual bar
32
combination of lingual and labial bar and is used when only incisors remain
swing lock
33
stress breaking mandibular major connector
split mandibular major connector
34
connects the major connector to the peripheral components
minor connector/truss arms
35
definition of load in prostho
resistance to penetration of denture teeth to bolus of food during mastication
36
minimum thickness at junction for minor connector with rest
base metal: 1.5mm titanium: 1.5mm gold: 2.0mm
37
dimension of guide planes
2-3mm wide occlusogingivally
38
role of acrylic base
support stability replacement of lost bone and soft tissue bind tooth to framework
39
what is the finishing line
clean transition between metal and base
40
function of tissue stop
maintains proper orientation of framework on cast during try-ins
41
types of acrylic retention areas
-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
vertical vs horizontal external finishing lines
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
why must external and internal finish line not coincide
for bulk and greater strength
44
types of rests
occlusal incisal lingual onlay
45
width of occlusal rest
1/3 of tooth buccolingually, 1/2 intercuspal wider base to reinforce junction and attach to rest
46
clearance of occlusal rest to marginal ridge
1.5-2mm
47
shape of floor of occlusal rest
spoon-shaped
48
thickness of rest at deepest part
1-1.5mm use #4 round bur
49
walls of rest seat are sloping to accommodate minimal movements that dissipate stress called
play
50
indication for onlay rest
tilted teeth infraerupted teeth
51
outline form of incisal rest
saddle-shaped
52
cingulum rest are mainly placed on these teeth only
maxi canines
53
parts of clasp
retentive component reciprocating component rest
54
advantage of c-clasp over i-bar
bracing/stability
55
advantage of i-bar over c-clasp
superior retention
56
description for how retentive arm engages undercut
dragging action
57
parts of retentive arm
rigid thirds - thickest and widest, at suprabulge semi-rigid - crosses survey line flexible third - engages undercut/below survey line
58
purpose of reciprocal arm
-while the retentive arm is flexing, the reciprocal arm should resist the pushing action -above survey line -rigid, not tapering
59
required vertical clearance for gingivally approaching clasp
5mm
60
why does i-bar have to originate one tooth away
for flexibility
61
minimum encirclement of clasp
180 degrees + 1 degree minimum
62
which components are direct retainers
clasps
63
which components are indirect retainers
rests denture bases
64
what causes creation of fulcrum lines
rests
65
most favorable placement of undercut
junction of middle and gingival third
66
most favorable placement of reciprocal arm
middle third
67
6 principles of clasp design (RSSREP)
retention stability support reciprocation encirclement passivity

142 - RPD (7 decks)

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