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Removable Partial Prosthodontics > RPD HOLY GRAIL > Flashcards

RPD HOLY GRAIL Flashcards

1
Q

Which of the following are done last?

A) Framework try in
B) Create rests
C) CR Record
D) Altered cast

A

D) Altered casts; assure support for RPD

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2
Q

List the order of the following:

  • CR Record
  • Framework try in
  • Altered cast
  • Create rests
A
  1. Framework try in
  2. Create rests
  3. CR Record
  4. Altered cast
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3
Q

If an RPD is part of planned treatment; plan the RPD:

A

Before beginning any other treatment

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4
Q

These are the clinical steps for an RPD fabrication
1. Diagnosis, treatment plan, hygiene
2. Diagnostic casts
3. Draw design & list abutment modifications on the prosthesis design page
4. Instructor approval
5. Complete Phase I treatment
6. Abutment modifications
7. Preliminary impression to check abutment modifications
8. Fabricate and cement crowns or fixed partial dentures
9. Final framework impression
10. Make two casts
11. Draw design on 2nd cast
12. Instructor approval/ corrections of drawing/design on cast
13. Complete RPD framework prescription (instructor signature required)
14. Second pour cast with design sent to lab with first pour
15. Inspect wax-up
16. Framework adjustments (create rests)
17. Altered cast impressions if needed
18. Jaw relation records (CR record)
19. Select & set denture teeth
20. Try-in with teeth in wax
21. Process, adjustment, deliver to patient (altered cast)

A
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5
Q

How far distally should the denture base extend in a class 1 distal extension case?

A

2/3 of the retromolar pad

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6
Q

Bilateral edentulous area posterior to remaining teeth describes:

A

Kennedy Class I

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7
Q

Maxillary framework extends (in Kennedy class I)

A

2/3 distance to hamular notch (resin engages further)

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8
Q

How far distally should the retention extend for a distal extension case?

A

Extends to 2/3 from the guide plate to 2/3 of the retromolar pad

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9
Q

Which of the following is the hardest to obtain with a distal extension case?

A

VDO record (possibly also establishing plane of occlusion)

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10
Q

Essential to prevent displacement or deformation of the metal framework during resin-packing procedures

A

cast stop

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11
Q

Cast stops project from the tissue surface of the ____ to contact the ___

A

minor connector; dental cast

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12
Q

A ____ should be used to join acrylic resin and metal components at the internal surface of an RPD

A

butt joint

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13
Q

A butt joint should be used to join ____ an d____ components at the ____ surface of an RPD

A

acrylic resin; metal components; internal

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14
Q

Each internal finish line of a butt joint should display an angle of:

A

90 degrees

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15
Q

The internal angles of external finish lines should be:

A

sightly less than 90 degrees

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16
Q

The internal angles of external finish lines should be slightly less than 90 degrees, what does this result in?

A

improved mechanical retention for acrylic resin components

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17
Q

In a butt joint the internal angle = ____; the external angle = ____

A

internal= 90

external= acute

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18
Q

Base plate wax on cast for relief in edentulous areas:

A

wax patterns

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19
Q

Wax patterns are made on the:

A

refractory cast

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20
Q

The cast that is used for fabricating the framework:

A

refractory cast

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21
Q

What does “support” mean for direct retainers?

A

resists vertical movement towards the soft tissue

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22
Q

Resistance to removal from the tissues or teeth:

A

retention

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23
Q

Resistance to movement in a horizontal direction (anterior-posteriorly or medio-laterally)

A

Stability

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24
Q

Resistance to movement towards the tissues or teeth:

A

Support

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25
Q

A tooth that supports a partial denture:

A

abutment

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26
Q

A component of a partial denture that provides both retention and support for the partial denture:

A

retainer

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27
Q

What three components are required clasp assembly?

A

support, resistance & retention

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28
Q

T/F: The completed RPD must be passive

A

true

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29
Q

T/F: The RPD should exert forces on the teeth and soft tissue

A

false- the RPD should NOT exert forces on the teeth or soft tissue

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30
Q

T/F: The toe of each retentive clasp should lie passively in a measured undercut

A

false- The tip of each retentive clasp should lie passively in a measured undercut

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31
Q

Where should the tip of each restive clasp lie?

A

passively in a measured undercut

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32
Q

Clasps should be ____ when fully seated, meaning:

A

passive; not directing force on the tooth

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33
Q

The reciprocal arm of the clasp should contact the tooth:

A

before the retentive tip passes the height of contour

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34
Q

The reciprocal arm of the clasp should contact the tooth before the retentive tip passes the height of contour so it can:

A

hold the tooth in place as the retentive tip puts off-axis pressure on it

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35
Q

The reciprocal arm of the clasp should contact the tooth before the retentive tip passes the height of contour so it can hold the tooth in place as the retentive tip puts off-axis pressure on it. This:

A

neutralizes the stress from the retentive tip

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36
Q

T/F: A class I lever is ideal. RPI is an example of a class I lever.

A

False; false

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37
Q

Class I Lever=

A

most detrimental

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38
Q

Class II lever=

A

ideal- RPI is an example of a class II lever

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39
Q

RPI is an example of a:

A

class II lever

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40
Q

RPI stands for:

A

Rest (mesial), Proximal plate, I-bar

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41
Q

What type of support allows for an RPI?

A

Tooth tissue (class I, II, & long class IV)

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42
Q

Does an RPI satisfy the principle of encirclement?

A

NO

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43
Q

RPI= class II lever =

A

stress release

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44
Q

Wrought wire needs an elongation factor of:

A

more than 6%

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45
Q

It is important that a wrought wire clasp have an elongation percentage of more than 6% (PTQ) allowing _____ without microstructure hangers that could compromise its physical properties (like creating a fracture)

A

allowing clasp to bend

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46
Q

Check biting is caused by:

A

a) lack of horizontal overlap
b) Mandibular teeth too far buccal

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47
Q

Moving the buccal cusp lingually increases

A

horizontal overlap

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48
Q

Caused by insufficient overlap between maxillary and mandibular teeth:

A

cheek biting

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49
Q

If artificial teeth are correctly positioned and cheek biting occurs:

A

round the buccal cusps of mandibular posterior teeth to move buccal cusps slightly lingually (thereby creating a greater horizontal overlap)

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50
Q

If cheek biting occurs and artificial teeth are incorrectly positioned or rounding does not help:

A

remove the artificial teeth and reset them

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51
Q

Caused by the artificial teeth being positioned too far lingually, resulting in a decrease in tongue space:

A

tongue biting

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52
Q

Tongue biting is caused by the artificial teeth being positioned too far _____, resulting in a ____ of tongue space

A

lingually; decrease

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53
Q

How do you fix tongue biting?

A

by rounding lingual cusps/recontour lingual surface

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54
Q

What would the following alterations help?

  • gentle “rounding or rolling” of lingual cusps and recontouring of the lingual surfaces of the mandibular teeth
A

tongue biting

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55
Q

What do you do if tongue biting continues after teeth have been reshaped?

A

Remove and reset artificial teeth

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56
Q

Which of the following doesn’t call for a rebase?

A

dentition or moveable

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57
Q

_____ is a laboratory technique in which the bulk of the denture base is removed and replaced using new resin

A

rebasing

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58
Q

The rebasing approach results in a ______, but is technically complicated by the fact that the retentive meshwork is buried within the denture base- often without sufficient relief beneath the mesh to allow for adequate bulk of new resin

A

base of uniform quality

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59
Q

Rebasing is indicated when: (3)

A
  1. denture bases do not extend to cover all of the denture bearing tissues
  2. denture base has been fractured
  3. denture base has become irreparably discolored
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60
Q
  1. denture bases do not extend to cover all of the denture bearing tissues
  2. denture base has been fractured
  3. denture base has become irreparably discolored

What would you do for the listed situations?

A

rebase

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61
Q

_____ when both denture base and denture teeth need work

____ when atleast 2mm is present under denture base OR indirect retainer lifts 2mm+

A

Remake; Reline

62
Q

When should you reline the denture base?

A
  1. when atleast 2mm is present under denture base
  2. when indirect retainer lifts 2mm+
63
Q

The anterior teeth disclude the posterior teeth when the mandible moves in protrusion:

A

anterior guidance

64
Q

Anterior guidance describes the anterior teeth disclude the posterior teeth when the:

A

mandible moves in protrusion

65
Q

With anterior guidance, the ____ , ____, and ____ disclude the posterior teeth when the mandible moves in protrusion

A

canines; central incisors; lateral incisors

66
Q

With anterior guidance, the canines, central incisors, and lateral incisors disclude the posterior teeth when the mandible moves in:

A

protrusion

67
Q

Contacts between the posterior teeth during excursive movements are considered ____ that can create damaging effects on the teeth and periodotnium.

A

interferences

68
Q

With anterior guidance, describe what should occur with the posterior teeth:

A

Posterior teeth SHOULD NOT touch (in excursive movements)

69
Q

These create off-axis forces in posterior teeth, where you’re close to the TMJ. Meaning high load in off-axis direction, leading to damage to the teeth

A

Interferences (posterior teeth)

70
Q

Which of the following are involved in support?

A) Rest
B) Major connector
C) Denture base
D) All of the above

A

D) All of the above

71
Q

What material is most commonly used to make denture bases?

A

PMMA

72
Q

What denture base material is being described?

  • Difficult to adjust
  • Poor esthetics
  • Part of cast framework
  • Good thermal conductivity
  • Can be kept thin
A

Metal

73
Q

What denture base material is being described?

  • Acrylic resin
  • Most common
  • Easily adjusted and relined
  • Good esthetics
  • Attached to framework by lattice or mesh
A

Polymethyl methacrylate (PMMA)

74
Q

_____ is the most common material used for a denture base

A

PMMA

75
Q

What type of material should be used in distal extension cases?

A

PMMA

76
Q

What type of joint should be used with PMMA?

A

Butt joint (90 degrees) with major and minor connector

77
Q

Can you reline a PMMA base?

A

yes

78
Q

Advantages of acrylic resin bases (PMMA) (3):

A
  1. ability to reline the base as the supporting tissue changes
  2. Esthetically superior to metal bases
  3. Ease of repair
79
Q

Disadvantages of acrylic resin bases (PMMA) (4):

A
  1. Dimensional stability less than metal base- warpage
  2. Lower strength than metal- long spans
  3. Porous- hygiene
  4. Low thermal conductivity
80
Q

What occurs if instead of a butt joint (90 degrees) for acrylic resin bases, a feathered edge is used?

A

distortion, breakage, or separation from the framework causing injury to the underlying soft tissue

81
Q

Which of the following is true about PIP? For the false options make them true!

A) PIP means pink indicating paste
B) Should be put on camio surfaces
C) Should be put in great amounts
D) Should be in brush strokes

A

True: D- should be in brush strokes

A- PIP means pressure indicating paste
B- Should be put on intaglio surface
C- Should be put in small amounts

82
Q

Checks soft tissue impingement during framework adjustment step:

A

PIP

83
Q

PIP is placed on the ____ surface to check for ____ areas

A

intaglio; pressure

84
Q

If clasps are tight on a class III with circumferential clasp you use what to adjust?

A) 139
B) Hemostat
C) 200
D) Remake

A

A- 139

85
Q

A class III is ___ supported

A

tooth

86
Q

Indications for circlet:

A

undercut OPPOSITE of edentulous site

87
Q

An undercut adjacent to the edentulous site means NO:

A

circlet

88
Q

For adjusting retentive clasps as a general rule, at the time of insertions ____ retention should be used

A

slightly less than maximum

89
Q

Only the ____ should be used when adjusting a half round cast circumferential cast

A

139 plier

90
Q

Only the 139 plier should be used when adjusting:

A

half round cast circumferential clasp

91
Q

Clasps should be adjusted in:

A

small increments

92
Q

Excessive bending of a clasp in one direction only will lead to:

A

accelerated fatigue and failure of the clasp

93
Q

The surveyor is used for:

a) undercuts
b) interferences
c) path of draw
d) all of the above

A

d) all of the above

94
Q

If there isn’t a lot of inter arch space, what material should be used for the denture base?

A

metal

95
Q

Metal bases cannot be relined so they are generally not used for:

A

tooth-tissue borne removable RPDs or in areas where teeth has been removed in 12 months

96
Q

Why are metal bases not used for teeth that have removed within 12 months?

A

resorption will still be occurring at an increased rate, and relining will usually be required

97
Q

T/F: All distal extension cases require clinical remount. All class 3 might require clinical remount

A

first true; second false

98
Q

All ____ cases require a clinical remount

A

distal extension

99
Q

All ____ supported RPDs will require clinical remounting

A

tooth-tissue

100
Q

Which of the following will require a remount?

a) class III tooth supported
b) class I tissue supported
c) Class II tissue supported

A

B & C

101
Q

Chromium-cobalt shrinks:

A

2.2-2.4 %

102
Q

What metal is used at UMKC?

A

CoCr

103
Q

Why is CoCr used more than NiCr?

A

due to nickel allergy

104
Q

Possible causes of failure of chromium-cobalt alloys include:

A
  1. cold-working
  2. shrinkage-porosity
  3. low percent elongation
  4. excessive carbon in the allow
105
Q

Cause of chromium-cobalt failure that reduces the percentage of elongation that causes a decrease in hardness:

A

Cold working

106
Q

Cause of chromium-cobalt failure due to the alloys shrinking approximately 2.3% resulting in porosity

A

shrinkage porosity

107
Q

Cause of chromium-cobalt failure directly related to greater brittleness

A

low percentage elongation

108
Q

Cause of chromium-cobalt failure that involves reactions with other constituents to form carbides:

A

excessive carbon in the alloy

109
Q

which occurs last?

A- altered cast technique
B- CR record
C- Framework made
D- Rest created

A

A- Altered cast technique

110
Q

Put the following in order:

  • create rests
  • framework try-in
  • altered casts
  • CR record
A
  1. framework try in
  2. create rests
  3. CR record
  4. altered cast
111
Q

What is the purpose of an altered cast impression?

A

To capture an accurate relation between the teeth, framework, and residual ridge (in distal extension cases)

112
Q

What do you need a clinical remount?

A

interocclusal record (jaw relation)

113
Q

Clinical remounting procedure:

A
  1. face bow preservation
  2. pickup impression
  3. block out undercuts
  4. remount cast and interocclusal record
  5. articulate
114
Q

Describe a pick up impression:

A

When you insert the RPD in the mouth, then take an impression so that the impression pick ups the RPD plus shows where the teeth are

115
Q

Which of the following is NOT an advantage of chromium-cobalt alloys?

A- low density (weight)
B- high modulus of elasticity (stiffness)
C- low material cost
D- resistance to tarnish
E- increased flexibility

A

E- increased flexibility (we want rigid; not flexible)

116
Q

Necessary to ensure that the partial denture functions as one unit:

A

rigidity

117
Q

If the denture flexes, ____ & ____ can be compromised

A

cross arch stabilization and stress distribution

118
Q

A major connector can be made more rigid by:

A

using a more rigid alloy (CrCo)

119
Q

Chromium cobalt alloys are ___ in comparisons to gold or palladium alloys

A

more rigid

120
Q

Chromium cobalt alloy stiffness can be overcome by including:

A

wrought-wire retentive elements in there framework

121
Q

_____ alloys are approximately twice as flexible as the ____ alloys

A

gold alloys; chromium cobalt alloys (PTQ)

122
Q

Kellys Combination syndrome would present as:

A

Lack of osseous tissue in the anterior maxillary

123
Q

What does NOT describe Kelly’s combination syndrome:

  • Lack of osseous tissue in the anterior maxilla
  • Loose tissue in the posterior maxilla
  • Intrusion of the mandibular anteriors
  • cystic palatine nerve
A

Loose tissue in the posterior maxilla

124
Q

T/F: Guide plane should be 1/2 distance between cusp tips. Guide plane is as wide as rest.

A

Both true

125
Q

How wide should the guide plane be?

A
  • as wide as the widest portion of the occlusal rest
  • 1/3 the BL width of the tooth
  • 1/2 distance between cusp tips
126
Q

With a guide plane, the normal tooth contour is maintained:

A

buccolingually

127
Q

T/F: The gingival margin to superior border of lingual bar is 3-4 mm. Measure the distance on the cast, not in the mouth.

A

First statement true; second statement false. Measure the gingival margin to superior border of lingual bar in the mouth

128
Q

Beaded border depth:

A

1mm deep; 1.5mm wide

129
Q

a prepared groove on the master cast along the designated borders of maxillary major connectors:

A

bead

130
Q

What is the purpose of a bead?

A
  1. increased rigidity
  2. guide for finishing
  3. compensate for casting inaccuracies
  4. displaces soft tissue, prevent food/air/fluid collection
131
Q

What is the primary action of a bead?

A

displaces soft tissue, preventing food/air/fluid collection

132
Q

Describe the dimensions of a beaded border:

A

using 1/2 round bur, 1 mm deep and 1.5 mm wide; feathers out to nothing 6mm from the free gingival margin; shallower over the mid palatal suture

133
Q

If you have a large inoperable torus you need to use:

A

horseshoe

134
Q

If you have a very high palatal vault you need to use:

A

horseshoe

135
Q

I-bar with distal extension does NOT use:

A

DF undercut (it does use MF and mid-f)

136
Q

Papillary hyperplasia is all except:

A

destructive bone disease

137
Q

Papillary hyperplasia is a form of:

A

denture stomatitis

138
Q

Where is papillary hyperplasia found at?

A

palatal vault

139
Q

Causes of papillary hyperplasia include:

A
  1. local irritation
  2. poor fitting dentures
  3. poor oral hygiene
  4. leaving denture in 24 hrs a day
140
Q

Treatment for papillary hyperplasia includes:

A
  1. educate patient on oral hygiene
  2. advise patient to leave denture out at night
  3. soak denture for 30 min in 1% sodium hypochlorite & rinse thoroughly
  4. use tissue conditioner
  5. patient should brush irritated area lightly with a soft brush
141
Q

T/F: A cingulum rest is placed between the incisal and middle one third of incisors

A

False- its near the cervical end for maxillary anterior teeth

142
Q

Indications for lingual rest seats include:

A
  1. primarily maxillary canines- not incisors
  2. canines with gradual lingual slope
143
Q

____ transmits the forces along the long-axis of the tooth; prevents migration

A

Postive rest seat

144
Q

A positive rest for a cingulum rest is used because:

A

it prevents lateral movement

145
Q

A positive rest for a cingulum rest directs forces:

A

toward long axis of tooth

146
Q

A surveyed crown is indicated when:

a- the survey line is in the gingival 1/3
b- no undercuts exist on abutment teeth
c- with the help of enamels-last, one cannot have the changes necessary for the abutment teeth without cutting into dentin
d- all of the above are true

A

all of the above are true

147
Q

Indirect retainers have all of the following characteristics except:

A

Its a DO rest on a posterior abutment (Want as far forward as possible so use an MO)

148
Q

Hyuperplastic tissue should be removed prior to construction of your RPD to:

A

provide a firm, stable base for the denture

149
Q

Before construction of a CD or RPD, it is very important to:

A

surgically remove the hyperplastic tissue

150
Q

The best impression technique for a patient with loose hyperplastic tissue is to:

A

register the tissue in its passive position (PTQ)

151
Q
A

Removable Partial Prosthodontics (12 decks)

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