RPD Test1 Flashcards
1
Q
3 types of RPD’s:
A
Tooth borne
Tooth-mucosa borne
Implant-assisted
2
Q
Clasp-Retained RPD’s: Resistance to vertical dislodging forces:
Resistance to lateral, torsional, horizontal forces:
Resistance to vertical seating forces:
A
Retention
Stability (Bracing)
Support
3
Q
A tooth, a portion of a tooth, or that portion of a tooth or of a dental implant that serves to STABILIZE or retain a prosthesis:
A
Abutment
4
Q
Any type of device used for the stabilization or retention of a prosthesis:
A
Retainer
5
Q
6 advantages of RPD vs FPD:
A
Abutment teeth may not require restoration (more conservative)
Better OH
Cross-arch stabilization
Reduced Fees
More esthetic (sometimes - if clasps not visible )
Replace bony & soft tissue contours
6
Q
Implants can be used for Distal Support by placing as posteriorly as possible - this refers to _____ forces
A
Downward
7
Q
Support is gained by the most ______ placement possible
Retention is gained by the most ______ placement possible
A
posterior
anterior
8
Q
Treatment sequence (4 part):
A
Examination
Diagnosis
Treatment Plan
Treatment
9
Q
Hypersensitivity, mobility, and soft tissues are all part of what in the Treatment sequence?
A
Examination
10
Q
T/F
Examination phase includes radiographs
A
True
11
Q
4 things looking for in Radiographic Examination:
A
Pathology
Caries
Quantity of bone
Quality of bone
12
Q
In the Diagnosis/Tx planning phases, what 7 things can you do with Mounted Diagnostic Casts:
A
Preliminary Design
Tx Sequence
Path of Placement
Unfavorable tooth position, contours, inclinations
Embrasure clearance
Occlusion/articulation
Interarch distance
13
Q
The component of a RPD used to retain and prevent dislodgment - consists of clasp assembly or precision attachment
A
Direct Retainer
14
Q
What partially encompasses or contacts the abutment tooth - acts as a direct retainer?
A
Clasp Assembly
15
Q
What portion of the Clasp Assembly in stabilizing and retaining the RPD
A
Clasp
16
Q
What are the 3 parts of a Clasp Assembly?
A
Rest
Retention
Reciprocation
(latter 2 are the Clasp)
17
Q
Plates or Bars - connects one side to the other
Smaller portion connects to clasps or rests:
A
Major Connector
Minor Connector
18
Q
RPD component functioning through a lever action:
A
Indirect Retainer
19
Q
What area of an RPD connects the resin base and can be open lattice or mesh:
A
Plastic retention (Denture base) area
20
Q
Most posterior portion of an open lattice w/ no posterior teeth in an RPD
A
Tissue stop
21
Q
The location of the Fulcrum Line is criteria for selection of the Maxillary Major Connector
A
True
22
Q
Maxillary Major Connector has to be ___mm from gingival margins
If less, use what type of design?
A
6mm
Plate type design
23
Q
The Maxillary Major connector’s anterior borders must follow what?
The posterior borders end where?
A
Valleys of Rugae
Hard palate - do NOT extend onto soft palate
24
Q
What type of Maxillary Major connector is used with questionable teeth?
A
Plate type design
25
5 types of Maxillary Major Connectors:
Anterior palatal strap
Posterior palatal strap
Ateroposterior palatal strap
Modified palatal plate
Complete palatal plate
26
Location of edentulous area, functional depth of lingual vestibule, anticipated loss of natural teeth, inclination of remaining teeth - all are criteria selection for what?
Mandibular Major Connector
27
How deep does the Lingual Vestibule need to be for a Mandibular Major Connector?
7mm
| 3mm from tooth, 4mm of connector
28
If 3mm from gingival margins cannot be obtained for a Mandibular Major Connector (for total of 7mm), what type of designs should be used?
Plate type designs
29
Metal of the surface of ______ is highly polished
on _____ isn' t highly polished
Mandibular Major Connector
Maxillary
30
The portion of a dental prosthesis (RPD) that is reduced to eliminate excessive pressure:
Relief Area
31
Name 2 types of RPD:
Tooth borne
Tooth-mucosa borne
32
4 types of Mandibular Major Connectors:
Lingual bar
Sublingual bar
Lingual plate
Labial bar
33
2 requirements for a Minor Connector:
Rigid
Max exposure (must not impinge on marginal gingival tissues)
34
How thick should the Minor Connector-Rest Junction be?
1.5mm
35
The Minor Connector should be located __mm from other vertical components
5mm
36
4 components of a Clasp Assembly:
Clasp
Reciprocal Clasp
Cingulum
Rest
Minor connector
37
3 types of Rests:
Cingulum
Incisal
Occlusal
38
2 components of a Clasp:
Retentive component
Bracing (stabilizing) component
39
What side of the Clasp engages the Undercut?
What side doesn't?
Retentive
Bracing
40
T/F
| Encirclement (180 at least) and Passivity are requirements of Clasps
True
41
3 Clasp Categories:
Suprabulge - cast circumferential
Infrabulge - cast bar
Combo
42
3 types of Suprabulge (circumferential) Clasps:
Cast circlet (Akers)
Embrasure
RPC (RPA)
43
2 types of Bar (Infrabulge) clasps:
RII
RPI
44
T/F
| Rests are a type of Indirect Retainer
True
45
3 types of Indirect Retainers:
Rests
Minor connectors/proximal plates
Lingual plate major connector
46
If you have a Clasp, you need a _____
Rest
47
T/F
| RPD clasp needs a rest otherwise would move in a cervical direction and cause trauma
True
48
A Rest directs forces where?
Long axis of tooth
49
Rest dimension should be ____ faciolingual width of tooth
Marginal ridge reduced ___ mm
(__mm if using Gold)
1/3
1. 5 mm
2. 0 mm
50
The angle of the minor connector and the rest should be ____
less than 90 degrees
51
2 adjacent occlusal rest seats form what?
Embrasure clasps
52
What type of Rest Seat is saddle shaped, has a potentially objectionable metal display, and has greater mechanical advantage than lingual rest seats?
Incisal rest seats
53
Type of rest seat w/ inverted U/V that may require use of restoration to establish
Cingulum
54
What Rest seat is placed in the mesial or distal half o fthe tooth at the junction of the middle and gingival one third?
Ball
55
Rest Seat prep sequence:
Guiding plane
Rest seat
smooth/polish
56
2 types of denture bases that contact mucosa:
Resin on metal
metal
57
What type of RPD has an internal finish line of the metal component?
Maxillary (tooth or tooth-mucosa borne)
58
If Internal/External finish line, External should be ____
Internal should be ____
less than 90 degrees
90 degrees
59
T/F
| Use a metal denture base for max strength and when relining is not anticipated
True
60
T/F
| A surveyor can be used to evaluate esthetics
True
61
T/F
| The height of contour and the survey line are the same
False
*different if tilt
62
T/F
RPD should help to eliminate oral disease, preserve what remains, restore function and esthetics and not interfere with patients speech
True
63
What teeth are lost first?
Which tend to be last?
Posteriors
Mandibular anteriors
64
Resistance to removal from the tissues or teeth
Retention
65
Resistance to movement in a horizontal direction
Stability
66
Resistance to movement towards the tissues or teeth
Support
67
A tooth that supports a partial denture
Abutment
68
A component of a partial denture that provides both retention and support for the partial denture
Retainer
69
Angle viewed between a vertical rod contacting an abutment tooth and the axial surface of the abutment cervical to the height of contour
Angle of Cervical Convergence
70
A Palatal Major Connector is greater than ____mm in width
Palatal Bar is less than __mm in width
8mm
8mm
71
Vertically parallel surfaces of abutment teeth shaped to direct a prosthesis during placement/removal
Guiding Planes
72
Functional Impression vs. Static Form
Harder vs softer matl.
*records in function vs. not supporting a functional load
73
Simultaneous contact of both maxillary and mandibular teeth
Balanced Occlusion
74
Dynamic registration of opposing dentition
Functional Occlusal Registration
75
More than relining - replacement of the entire denture base w/o changing occlusion
Rebasing
76
Resurfacing of denture base with new matl to make it fit the underlying tissue more accurately
Relining
77
RPD component used to retain or prevent dislodgment (consists of clasp assembly or precision attachment)
Direct Retainer
78
RPD part that assists in preventing vertical displacement of distal extension via lever over fulcrum
Indirect Retainer
79
Clasp Assemblies partially encompass of contact the ______
Abutment
80
2 types of clasp arms that terminate in the undercut
Bar Clasp (comes off denture framework)
Circumferential
81
Clasp arms operate by friction
False
82
Resists movement away from tissue:
Resists lateral movement:
Resists movement toward tissue:
Retention
Stability
Support
83
4 Tx objectives for RPD's
Eliminate disease
Preserve remaining teeth and supporting structures
Restore/improve mastication esthetics and phonetics
Restore health, comfort, quality of life
84
5 phases of the Problem List
Urgent
Control
Re-evaluation
Definitive
Maintenance
85
Major connectors must be ______
Rigid
86
3 Functions of the Major Connector:
Unification
Stress Distribution
Cross-Arch Stabilization (Counterleverage)
87
T/F
| Major connectors should be placed as far from the FGM as possible and practical
True
88
What 2 soft tissue areas are of utmost concern when designing a Major Connector
Moveable part of Mx Soft Palate
Mb lingual frenum
89
Major connectors in the upper arch should terminate ___mm or more from the gingival crest tissues
6mm
90
What Maxillary design is circular and especially useful in cases with a torus
Anterior-Posterior Palatal Strap
*If less than 8mm, Palatal Bar
91
3 cases to use a Full Palatal Plate:
Long distal extension
6 or less Ant. teeth
Primary abutments periodontically involved
92
When to use a Palatal Bar?
When no other option viable
*usually too much bulk
93
What type of connector is poor from a biomechanical standpoint and shouldn't be used unless absolutely necessary?
*Tori prevents use of other connectors
Palatal Horseshoe Plate
94
Maxillary Major connectors should be how far away from the FGM?
Mandibular Major connectors should be how far away from the FGM?
If this distance isn't possible in either arch, where should the border of the connector be?
6 mm
3 mm
On teeth
95
The most commonly used Mandibular Major Connector:
Lingual bar
96
A Lingual Bar (Mandibular) requires a vestibule how deep?
Flat on the tissue side, ____ on the tongue
Occluso-gingival width of ____to____ mm
Thickness of ____to_____mm
7-8 mm or more
convex
4 - 6 mm
1.5 - 2 mm
97
A Lingual Bar with extension over the cingula of Anterior Teeth:
* most often used when there is less than 3mm from the FGM
* can be contraindicated by mobile teeth (perio)
Lingual Plate
98
Lingual bar + secondary bar on cingula (mandibular):
*not recommended
Continuous Bar Retainer (Kennedy Bar, Double Lingual Bar)
99
T/F
| Indications for a Mandibular Labial Bar are extremely rare and may include severe lingual inclination of the teeth
True
100
2 Types of gridwork minor connectors connecting denture base and teeth to the major connectors:
Open Lattice - can interfere if too thick
Mesh - less retention of acrylic
101
Relief under the Gridwork should start how far away from the tooth?
*metal wears less, better hygiene next to tooth
1.5 - 2 mm
102
Junction of Gridwork to major connector is a Butt joint with relief so must be at what angle?
Acute
103
Mandibular Gridwork should extend ____ the way from abutment to the retromolar pad
It should NOT extend where?
2/3
Ascending portion of the pad
104
Maxillary gridwork extension to Hamular notch:
2/3
105
Major connector should be at least __mm away from imaginary line of teeth
2mm
106
T/F
| A tissue stop is an extension of metal through the framework contacting the ridge
True
107
What contacts guide planes (a type of minor connector)?
Proximal Plates
108
T/F
| Guide plates can't be in undercut so wax is used to create zero degree blockout
True
109
4 parts, extra-coronal direct retainer:
retentive arm
reciprocal (bracing) arm
rest
minor connector
110
T/F
| Retention should be uniform (undercuts should be the same measurement e.g. 0.1)
True
111
T/F
| The clasp arm engaging the undercut should be flexible
True f
112
What type of clasp is used for Kennedy Class III's?
Cast Circumferential (Circlet/Akers)
113
Wha is the clasp of choice in tooth-borne cases?
Cast Circumferential (Circlet/Akers)
114
Cast Circumferential has a ______-bulge bracing (reciprocal) arm that is thicker and located in the _____ 1/3 of the tooth
the _____-bulge retentive arm is in the ____ 1/3 of the tooth
Suprabulge, Middle 1/3
Infrabulge, Gingival 1/3
115
A double Akers Clasp, aka...
Embrasure Clasp
116
3 Stress-Releasing clasp assemblies for Class I and II RPD's
RPI (bar clasp w/ mesial rest)
RPA
Combo
117
Rests should be in contact with the adjacent teeth
False
118
The proximal plate in an I-bar construction should be ___mm thick
(the I-bar itself comes off of the gridwork)
1 mm
119
A combination clasp has what shape wire?
Round (flexible)
120
Cast Circumferential clasps are used for every class except?
Indirect Retainers are used for every Class except?
Class I
Class III
121
Indirect Retainers should be placed where?
As far as possible from distal extension base
BUT, incisors often not strong enough, so furthest Canine/Premolar
122
T/F
| Indirect retainers are auxiliary cingulum rests or occlusal rests, not bar retainers or lingual plates
True
123
The struts of an Open Lattice in the Mb and Mx are _____ wide (the struts themselves)
The distance between struts is 5-7 mm for premolars and ____ for molars (Mb and Mx)
1.5-2.0 mm
7-10 mm
124
T/F
| The Flange should generally be shortened rather than extended to adapt mucosa
True
125
T/F
Denture bases should have internal/external finish lines that do not coincide and are acute
The external metal finish line should end 2mm lingual to replacement teeth
True
True
126
Occlusal rests for molars and Mx premolars are ____ the facio-lingual tooth width or ___ the inter-cusp width.
____ the mesio-distal tooth length
1/3
1/2
1/4-1/3
127
The marginal ridge must be lowered ___to ____ mm to allow sufficient bulk of metal
1 to 1.5 mm
128
Deepest occlusal portion of a rest should be ____ mm and angle of rest should be ACUTE
1.5 mm
129
A positive rest seat is _____
If not positive work is done by ______
Acute
Incline Plane
130
If a rest is prepared next to an existing tooth the seat is flared which direction?
Lingually
*don't want to impinge marginal ridge
131
Embrasure occlusal rests have additional marginal ridge reduction to ______
1.5 mm
132
Lingual rest seats (cingulum) are used for what 2 situations?
No posterior teeth available
Indirect retention
133
Cingulum rests are an inverted V or U and broadest in the middle, measuring ____ mm F/L in a Positive Rest Seat
M/D length is ____
1 mm
2.5 - 3 mm
134
A guide plane in Tooth Supported Segments should be ___ to ___ mm in height
in Distal Extension should be __ to ___ mm in height
2 to 4 mm
1.5 to 2.0 mm
135
What RPD is tooth borne with little, if any, soft tissue support?
Class III
136
T/F
| Class III RPD's generally do not rotate and no compensation for rotational forces is needed
True
137
T/F
| Class III RPD's preferred base is acrylic b/c relining an issue
False
*metal preferred, lining not an issue b/c tooth-borne
138
T/F
| Three is a Fulcrum Line in Class III RPD's
False
139
T/F
| The indirect retention in a Class IV is posterior
True
140
T/F
| Use a cutting tool to construct guide planes on proximal surfaces using Surveyor
True
141
3 planes of rotation:
Sagittal
Horizontal
Frontal
142
What Classes are partially tooth and partially tissue supported?
I, II, and IV
143
T/F
| Soft tissue is 250x more depressable than hard tissue
True
144
1st class Lever like a:
2nd class:
3rd class:
teeter totter
wheel barrow (fulcrum at wheel)
fishing rod (fulcrum at hand)
145
Distal extension RPD has distal rest on distal abutment, what Class Lever is created?
Class I (Pry bar effect extracts tooth)
Retainer at junction of middle/cervical 1/3's
146
What 6 Methods can decrease the effect of Class I Lever acting on a distal extension RPD?
Retention/Retainer
RPI/RPA retainer
Wire clasps
Extended Soft Tissue Bases
Indirect Retainers
Make sure occlusal forces directed in long axis
147
Maxillary Major connector provides ______ and is Polished
Mandibular Major connector doesn't provide _____ and is NOT polished
Support
Support
148
In Hernandez review, anything beyond ___mm is more of a Plate than a Strap
12 mm
*but actually 8, no?
149
Polish what surface of a Mandibular Bar?
Intaglio
150
What is the ideal undercut for a Rigid Component?
.010
151
180 circumference, Retention, Bracing, Support, Reciprocation, Encirclement, Passivity are all requirements of what?
Clasp
152
A complete circle flexes in what direction?
Wrought wire semi circle flexes in how many directions?
all
2
153
3 types of Suprabulge clasps:
Cast circlet (Akers)
Embrasure
RPC (RPA)
154
Rest seat prep sequence:
| 3 steps
Guide planes
Rest seats
polish
155
A Mesial rest disengages ____ and _____
apically
mesially
156
An I-bar should be placed where buccally?
mid to mesial
157
When would you NOT use a positive rest?
Wrought wire clasp
*Flat pulpal floor, circumferential wire around tooth
158
A cingulum rest should be positive
True
159
4 types of rests:
Occlusal
Incisal
Cingulum
Ball
