Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

SP15 Partial Dentures > Retainers > Flashcards

Retainers Flashcards

1
Q

This engages an abutment tooth to resist displacement of the RPD away from the tissues; keeps the RPD in place

A

direct retainer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

This type of direct retainer is cast or attached totally within the contours of the abutment tooth

A

intracornal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the two types of intracoronal retainers

A

key and keyway

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the ONLY advantage of an intracoronal retainer

A

esthetics

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the 5 disadvantages of an intracoronal retainer

A 
requires casting
complicated clinical/lab
difficult to repair
additional expense
may require the splinting of several teeth
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

This type of direct retainer resists displacement using components placed on or attached to the external surfaces of the abutment tooth

A

extracoronal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

This is the type of extracoronal direct retainer that we will be using for this course

A

clasp type retainer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What are the four parts of a basic clasp

A

rest
retentive arm
reciprocating arm
guiding plate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where would you like the arms of a cast circumferential to fall

A

in the middle 1/3 of the hight of contour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

This is used to determine the path of insertion, HoC, and under cut

A

surveyor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the function of the occlusal rests

A

in order for the partial to not seat into the tissues and irritate them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

This is used as a resistance to vertical dislodging forces

A

retentive arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

This counteracts the retentive force of the clasp

A

reciprocal arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Which arm, the retentive or reciprocal, goes beneath the height of contour in a CC clasp

A

retentive arm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Resistance to vertical seating forces is provided by what

A

the occlusal rests

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

In which tooth surface is it best to keep rests in

A

enamel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the best type of rest for anterior teeth, specifically canines

A

cingulum rest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the best type of rest for anterior teeth, especially when using the cingulum is not practical

A

incisal rest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is the indication for a CC clasp

A

Kennedy class III

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is the CC clasp excellent at

A

support
bracing
retentive properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Where is the location of the occlusal rest of a CC clasp

A

adjacent to the edentulous space

mesial or distal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Where is the location of the guide plate of a CC clasp

A

adjacent to the edentulous space

mesial or distal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Where is the location of the retentive clasp of a CC clasp

A

usually on the buccal

wherever the undercut is

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Where is the location of the reciprocating arm of a CC clasp

A

usually on the lingual

opposite of the retentive clasp

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
When is an embrasure clasp indicated
for a Kennedy class II, III or IV with no modification spaces on opposite of the arch to aid in clasping
26
Why are double occlusal rests needed with an embrasure clasp
to avoid wedging
27
What are the six requirements for every direct retainer or clasp assembly
``` support stabilization retention adequate encirclement reciprocity passivity SARRPS ```
28
This provides stabilization and unites the major connector with other components such as rests
minor connector
29
This component of the clasp provides stabilization
guide plates
30
What is adequate encirclement
greater than 180° encirclement around the tooth; engaging more than half the tooth
31
What is the passivity of the partial
there should be no active force on the tooth when the clasp is in place
32
This is the component of the RPD which contacts the oral much and to which the teeth are attached; made of pink acrylic and provides support
denture base
33
What are the three denture base retention designs
open lattice mesh nailhead (butt acrylic tooth)
34
Which denture base retention is used most frequently
open lattice denture base
35
What is the description of open lattice denture base retention
two longitudinal struts extending along the edentulous ridge, one strut buccal and the other lingual to the crest of the ridge one strut between each replaced tooth (like the edentulous space)
36
A mesh denture base is thin, which would this be indicated
when there is not a lot of inner arch distance
37
In the bead, wire, or nailhead retention the cast is formed directly on the ridge so what occurs
so there is no acrylic packed underneath; making relining impossible
38
How is retention gain via the bead, wire, or nailhead retention base
by the metal projection on the metal surface
39
When is a bead, wire, or nailhead indicated for a butt acrylic tooth
``` in 1 or 2 teeth in the anterior kennedy class III or IV ```
40
The acrylic resin joins the metal at what
at the butt joint (finish line) to prevent over thinning of the acrylic
41
Where are the internal and external finish lines
internal on the tissue side | external on the outer aspect
42
Butt acrylic teeth are not indicated for what
Kennedy class I or II
43
What are the characteristics of the external finish line
should be sharp, definite, and slightly undercut to adhere to resin angle or finish line with major connector should be less than 90°
44
What are the characteristics of the internal finish lines
formed from the margins of the relief wax, used over edentulous ridge to create space for the acrylic
45
This provides resistance which prevents the partial from being displaced toward the tissue; provided by the rests
support
46
This provides resistance to horizontal components of force; provided by the minor connector
stabilization
47
This provides resistance to dislodgment in a vertical or occlusal direction; provided by the retentive arm of the direct retainer; engaging the undercut
retention
48
This balances or counteracts the retentive force of the clasp; provided by the reciprocal arm
reciprocity
49
This is a component of a removable partial denture, located on the opposite side of the fulcrum line, that assist the direct retainer in preventing displacement of a denture base through mechanical leverage; prevents the lifting with sticky foods
indirect retainer
50
What is the purpose of the 2x2 tissue stop
prevents framework distortion during packing and processing of the acrylic resin
51
This type of direct retainer originates below the height of contour
infrabulge direct retainer
52
This type of direct retainer originates above the height of contour
suprabulge direct retainer
53
Kennedy class III uses which clasp design
CC clasp
54
Kennedy class I and II uses which clasp design
RPI and RPA
55
When is a wrought clasping system (combo included) indicated
when reduced force is desired upon the abutment; endo teeth and loss of bone support
56
This type of class is sometimes used when the available undercut is on the mesial lingual or mesial buccal of mandibular molars
ring clasp
57
Which clasp systems have a 0.02 undercut
wrought and combo clasp
58
What are four considerations when selecting the path of insertion
1. amount of tooth structure to be removed on guiding surfaces 2. correct location of undercut for clasping system selected 3. absence of tissue undercuts that will prevent the seating of the RPD along the path of insertion 4. patient's ability to place the RPD along the path of insertion
59
Why must RPD clasps be configured regarding a Ken I or II
due to the lever system; rotation occurs due to differences between the tissue and the PDL
60
How can you counteract the class 1 lever system on a Ken I or II
move the occlusal rest to the mesial
61
What are the components of the RPI clasp
R - mesial rest P - distal proximal plate I - I bar
62
What are three things to watch for when fabricating an RPI clasp
tori frenum shallow vestibule
63
When is an RPI contraindicated
when there is a bony undercut below the bar or a high frenum attachment
64
How is reciprocation provided in the RPI clasp
minor connector to the rest | proximal plate or guide plate to DL line angle
65
What are the components of the RPA clasp
R - mesial rest P - distal proximal plate A - Akers clasp, just like the CC but the ENTIRE retentive arm is below the height of contour
66
The wrought wire has what proportion above the HoC
2/3
67
What is the fulcrum line
an imaginary line though the most posterior rest;indicates around which the denture tends to rotate under masticatory forces; involved with indirect retainers
68
What are the components of the combo clasp
wrought retentive arm distal occlusal rest lingual reciprocating arm distal proximal plate
69
Which maxillary major connector is preferred for a Ken III
palatal strap
70
Which maxillary major connector is preferred for a Ken I, II, or IV
anterior-posterior palatal strap
71
At which distance from the FGM does the anterior-posterior palatal strap need to be located
5.0mm from FGM
72
What is the width of the anterior/posterior strap
8-10mm to prevent flexibility
73
What is the width of the lateral straps of the anterior-posterior palatal strap
7-9mm
74
What should the minimum width of the palatal strap connector be
8mm; should be determined by the width of the edentulous space
75
What is the approximate distance between struts
premolars; 7mm | molars; 10mm
76
What is the proper width of the struts
1.5-2mm
77
What is the proper distance between minor connectors
at least 5.0mm
78
For the RPI clasp, the proximal plate needs to extend where
to the distal lingual line angle for reciprocation

SP15 Partial Dentures (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions