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Removable II > Before midterm: Tooth Modification/ Principles of Design II > Flashcards

Before midterm: Tooth Modification/ Principles of Design II Flashcards

1
Q

Fxn of major connectors:

A

join components on both sides of arch

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2
Q

TF? All components of partial are directly or indirectly attached to the major connector.

A

T

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3
Q

5 types of Max major connectors:

A

palatal bar, palatal strap, Horse-shoe, A-P palatal strap, complete palate

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4
Q

Horse-shoe major connector is aka:

A

U-shaped

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5
Q

A-P palatal strap is aka:

A

A-P strap or O-Bar

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6
Q

When to use Palatal Bar:

A

Anchor-span Class III, 1-2 teeth missing on each side

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7
Q

Disadv of palatal bar:

A

little vertical support from palate, relatively bulky

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8
Q

Don’t position a palatal bar more anterior than:

A

2nd premolar, may affect speech

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9
Q

Why not to place palatal bar more anterior than 2nd premolar:

A

may affect speech

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10
Q

Which is thinner, palatal bar or palatal strap?

A

strap

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11
Q

Which Class partial are palatal strap typically used for?

A

Class II and III

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12
Q

Width of palatal strap should be at least:

A

8mm

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13
Q

Horse-shoe connector is indicated for:

A

prominent median palatine suture or an inoperable toris

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14
Q

TF? Horseshoe connector may be flexible.

A

T. bc it is curved

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15
Q

Contraindications of horse shoe connector:

A

Class I or II arches

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16
Q

Disadv of horseshoe connector:

A

little cross-arch stabilization

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17
Q

Adv of horseshoe connnetor:

A

may be flexible, rigid framework helps to distribute forces

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18
Q

This type of connector is preferred over Horseshoe connector:

A

rigid major connector

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19
Q

A-P palatal strap indications:

A

large edentulous span, prominent median palatine suture, inoperable torus

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20
Q

Width of each A-P palatal strap should be at least:

A

8mm

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21
Q

Open area on palatal region of A-P palatal strap should be at least:

A

15 X 20mm

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22
Q

Connectors to use for pts with inoperable torus or prominent median palatine suture:

A

horseshoe, A-P palatal strap

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23
Q

Posterior segment of the A-P palatal strap adds:

A

rigidity

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24
Q

Benefit of keeping open palatal portion bw straps of A-P palatal strap connector:

A

tongue / palate contact, taste, temperature

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25
Q

Connector that provides that greatest rigidity and support:

A

complete palate

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26
Q

Indications, complete palate

A

all posterior teeth replaced, perio compromised teeth, provides additional vertical support

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27
Q

Disadv of compete palate connector:

A

tissue health may be compromised POH

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28
Q

TF? Complete palate connector provides additional horizontal support.

A

F. Vertical

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29
Q

6 types of Man major connectors:

A

Lingual bar, lingual plate, sublingual bar, double lingual bar, cingulum bar, labial bar 5 bars and a plate)

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30
Q

double Lingual bar is aka:

A

continuous bar

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31
Q

Most freq used man major connector:

A

lingual bar

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32
Q

Adv of lingual bar for man major connector:

A

minimizes contact w teeth/ soft tissue

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33
Q

Contraindications of lingual bar:

A

lingual tori (usually)

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34
Q

Where to place bar for pt w lingual tori:

A

past contacting lingual aspect

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35
Q

Lingual bar requires at least __mm of space bw gingival margins and floor of mouth.

A

8mm

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36
Q

Lingual bar should be located here:

A

in the most apical position the movable soft tissues will allow

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37
Q

Type of man major connector to use if you don’t have room for the 8mm bw gingival margins and floor of mouth:

A

lingual plate

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38
Q

Shape of lingual bar in X-section:

A

half-pear

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39
Q

Adv of lingual bar:

A

wider, stronger at bottom

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40
Q

Indications for lingual plate

A

1’: less than 8mm for lingual bar, 2’: reduced perio support

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41
Q

Why is a lingual plate man major connector good if the remaining teeth have reduced perio support?

A

Force distribution over teeth and soft tissue

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42
Q

This man major connector scallops around anteriors:

A

Lingual plate

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43
Q

When to use lingual plate:

A

when not enough room for lingual bar

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44
Q

Disadv of Lingual plate:

A

covers a lot of tooth surface, minimizes cleansing action

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45
Q

TF? Teeth can easily be added to lingual plate.

A

T

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46
Q

TF? Lingual plate can often be used to avoid covering lingual tori.

A

T

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47
Q

Where should the inferior border of the lingual plate be positioned?

A

as low in the floor of the mouth as possible wo interfering w functional movements of tongue and soft tissues

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48
Q

TF? The major connector of the lingual plate should extend as far as movement allows.

A

T

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49
Q

From where to where is the superior border of the lingual plate scalloped?

A

from cingulum to interproximal contact

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50
Q

Lingual plate should eb supported by:

A

rests on mesial fossae of 1st premolars

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51
Q

What give vertical suppport for the lingual plate?

A

Rests on either end of plate

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52
Q

Disadv of lingual plate:

A

extensive coverage, decalcification, irritation of soft tisuse w POH

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53
Q

Scalloping of lingual plate is aka:

A

“step backs”

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54
Q

What are step backs of the lingual plate used for?

A

to accommodate diastemas (prevents display of metal)

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55
Q

TF? Lingual plate extends up to the cingulum and around the M and D surfaces of each tooth, but not into the interproximal area.

A

F. does not extend to M or D aspects of each tooth

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56
Q

Man major connector to use to maintain diastema.

A

lingual plate

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57
Q

Major connector is on the labial side of teeth for this type:

A

labial bar

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58
Q

Double lingual bar is aka:

A

continuous bar

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59
Q

What is the double lingual bar?

A

both sublingual bar and cingulum bar

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60
Q

When to use cingulum bar vs. lingual bar:

A

shallow floor of mouth (FOM)

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61
Q

Req’s of Major connector:

A

rigid, protects soft tissue, provides means for direct retention where indicated, and placement of a denture base, comfortable

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62
Q

Max major connector borders should be:

A

at least 6mm from free from, and parallel to, gingival margins

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63
Q

Man major connector borders should be:

A

at least 4mm from the free from, and parallel to, gingival margins.

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64
Q

Mandibular major connectors should be below:

A

sulcular depth, not occlusion blood supply

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65
Q

TF? Anterior border of man major connectors should end on anterior slope of rugae

A

F.

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66
Q

Anterior border of man major connector should end here:

A

posterior border of rugae

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67
Q

Man major connectors should be:

A

as symmetrical as possible, cross palatal midline at R angles

68
Q

What happens when the length of the major connector is reduced?

A

red irritation potential (?)

69
Q

Man major connector to avoid tori:

A

lingual plate w lingual connector

70
Q

TF? Small torus can be covered.

A

T, but provide relief

71
Q

Harder to avoid, man or max torus.

A

Man

72
Q

TF? Mandibular tori usually require removal for partial fabrication.

A

T

73
Q

Sharp corners on a partial can lead to:

A

Discomfort, stress concentration, susceptible to fracture

74
Q

Fxn of minor connectors:

A

join partial to major connector

75
Q

parts joined to major connector via minor connectors:

A

clasp assemblies, indirect retainers or auxiliary rests, denture bases, approach arms for infrabulge clasps

76
Q

TF? Denture base joined via latice-work is consider a minor connector

A

T

77
Q

minor connectors should have sufficient bulk of metal wo:

A

encroaching on tongue

78
Q

Minor connectors are positioned in:

A

lingual embrasures

79
Q

What to avoid when designing minor connectors:

A

narrow windows

80
Q

Windows of minor connectors should be at least _mm wide.

A

5mm

81
Q

how are rest seat connected?`

A

via minor connect + proximal plate`

82
Q

Examples of minor connectors:

A

indirect retainer, proximal plate, latticework

83
Q

Fxn of indirect retainers:

A

resist forces acting to dislodge prosthesis from seated

84
Q

Forces attempting to dislodge prosthesis come from:

A

sticky foods, gravity, etc.

85
Q

TF? Indirect retainer is considered a minor connector.

A

This is the framework component that resists rotational displacement of an extension base away from the supporting tissues

86
Q

Forces exerted down the long axis of a tooth via the clasp lead to forces being exerted here:

A

up on the distal portion of distal extension

87
Q

When does partial denture exhibit indirect retention?

A

When rotational forces are counteracted by placing indirect retainers

88
Q

Which type of partials require indirect retention?

A

All Kennedy Class I, II, and IV (III doesn’t)

89
Q

TF? The proximal plate is broad M-D and thin B-L

A

F. vice versa

90
Q

Benefit of proximal plate being broad BL and thin MD:

A

easier to put denture tooth in natural position

91
Q

M-D dimension should of proximal plate should be:

A

as narrow as possible, to preserve denture tooth space (about 1mm+)

92
Q

GP criteria:

A

2/3 width of BL cusps, MR to junction of middle and gingival 3rd

93
Q

GP criteria for GP adjacent to distal extension:

A

2/3 width of B-L cusps, Mr to middle 1/3

94
Q

Benefit of GP adjacent to distal extenion being shorted I-G than all others:

A

Allows framework rotation

95
Q

Types of lattice ork;

A

mesh, open loop

96
Q

Lattice work to use w limited space:

A

mesh

97
Q

Fxn of lattice work:

A

hold acrylic

98
Q

How far to extend distal extension lattice work

A

2/3 of alveolar ridge, past most prominent area of tuberosity

99
Q

TF? Extend lattice work to hamular notch.

A

F. to most prominent area of tuberosity

100
Q

This is where the acrylic joins the framework:

A

finish lines: external and internal

101
Q

What’s the difference bw the internal and external finish lines?

A

check?

102
Q

Desired angulation of internal finish line:

A

<90’ for flush junction and mech retention

103
Q

Function of internal finish line angulation less than 90’:

A

provide flush junction and provide mechanical retention

104
Q

Open loop lattice work is only needed for:

A

distal extension

105
Q

Fxns of tissue stops:

A

vertical stop on cast, flexing of framework during acrylic processing, stability to framework while setting teeth

106
Q

TF? All cross bars of distal extension provide vertical stops.

A

F. not the most posterior portion

107
Q

Tissue stops are only relevant:

A

during acrylic processing and evaluating on cast, not to support framework in mouth!!

108
Q

What does it mean if the tissue stop is not contacting after processing of the cast?

A

Error during fabrication. in contact w cast

109
Q

Only time to adjust the most distal portion of lattice work:

A

Pain and a pressure spot

110
Q

When are abutment teeth prepared?

A

prior to tooth modifications

111
Q

Before tx plan can be modified, you must:

A

mount dx cast, survey and design RPD

112
Q

Steps that must be done bf tooth modifications:`

A

relief of pain/ infection, complete surgical proc, correction of occ plane/ malalignment

113
Q

When to extract teeth for partials:

A

non-restorable, inadequate perio support unerupted/impacted

114
Q

Do we have all unerupted 3rd molars extracted before any partial fabrication?

A

check. If so, why?

115
Q

Surgeries that should be done before partial design:

A

extractions, tori / exostoses removal, reduction of enlarged tuberosities (no room for denture)

116
Q

Issue for ppl w large tuberosities:

A

no space for dentures

117
Q

How to manage minor supraeruption of teeth:

A

recontour occ surface (enamoplasty)

118
Q

How to manage moderate supraeruption of teeth:

A

onlay or crown

119
Q

How to manage severe supraeruption of teeth:

A

extraction

120
Q

When to expose dentin when recontouring tooth to correct occlusal plane:

A

never

121
Q

When is ortho indicated bf partial design:

A

distal molar tilted mesially, most pts won’t spend the $

122
Q

Define enamelplasty:

A

recontouring of axial surface

123
Q

TF? Enamelplasty requires local anesthetic.

A

F

124
Q

Enamelplasty:

A

conservative, in enamel, polished, practice on cast if substantial recontouring needed bc you want to know if pt is becoming sensitive to adjustment

125
Q

Why not to give pt LA for enamelplasty:

A

you want to know if the pt is becoming sensitive to the adjustments

126
Q

one way to correct clinical orientation of crown to avoid over contouring (excessive or insufficient undercut):

A

Survey crown, optimally contoured

127
Q

Survey sequence:

A

rest seat, GP, retention, reciprocation

128
Q

Sequence of tooth mods:

A

GP, HOC, rest preps

129
Q

GP of tooth mods for partial must allow:

A

direct seating and stabilize against lateral forces

130
Q

GP criteria for tooth mods for partial insertion:

A

2/3 width of B-L cusps, MR to junction of middle and gingival 3rd

131
Q

GP for tooth supported partial require GP with these dimensions:

A

2/3 width of B-L cusps, MR to junction of middle and gingival 3rd, maintain B-L contour

132
Q

GP for distal extension (tissue supported partial, Class I or II:

A

MR to middle 3rd, permits rotation of framework

133
Q

Benefit of additional rotation of distal extension:

A

minimizes torsion on abutment tooth (smaller GP)

134
Q

Any partial that is supported by ___ will rotate.

A

tissue

135
Q

TF. The bur should always be aligned with the long axis of tooth when making tooth mods.

A

F. with POI

136
Q

Survey crown is indicated when:

A

modification would expose dentin and compromise contour bc crown is tilted too much

137
Q

When to reduce on the cervical aspect of a tooth:

A

never, thin enamel

138
Q

Desired edge when making GPs:

A

Featheredge

139
Q

Location of retentive clasp:

A

gingival 3rd, 1.5-2mm from gingival margin

140
Q

Location of middle/ shoulder region of retentive clasp:

A

above HOC

141
Q

Reciprocal arm location:

A

junction of middle and gingival 3rd, always at or above HOC

142
Q

Place ___ clasp as low as possible and __ clasp as high as possible.

A

retentive, reciprocal

143
Q

Lateral force on tooth start when:

A

the retentive and reciprocal clasps touch the tooth for the first time and at same time

144
Q

Ideal location of HOC undercut in relation to margin:

A

1.5-2mm from margin

145
Q

When developing a retentive UC, this is the desired contour change:

A

Gradual, subtle contour change, not a semicircle 1.5-2mm away from gingival margin

146
Q

Other indication for recontouring:

A

adjust excessively convex proximal surfaces for improved esthetics, mesially drifting tooth encroaching on edentulous area to idealize spacing, lingually tipped teeth, for better adaptation of minor connectors

147
Q

When to recontour mesially tilted teeth:

A

to allow better adaptation of minor connectors or proper seating of major connector

148
Q

When should aspects of framework crossing over undercut regions of tooth engage the UC region?

A

never

149
Q

Minor connection in relation to tooth:

A

must be well off tooth, better to recontour tooth so framework components can be fabricated closer to tooth and not be annoying to pt

150
Q

Pour cast in this stone to quickly check tooth mods against surveyor:

A

snap stone

151
Q

When to do rest preps:

A

after verifying GP’s and HOC

152
Q

How to get snap stone cast back in same orientation as the original cast:

A

no way to, reestablish based on new snap stone

153
Q

Bur shape to use when making rest preps:

A

bullet shaped

154
Q

Additional space must be allotted for this when prepping survey crown:

A

rest seat

155
Q

Materials that can be used for survey crowns:

A

CCC, MCC

156
Q

TF? Tooth mods on other abutment teeth should be done bf final impression for survey crown:

A

T

157
Q

When doing SC, at what point do you do tooth modification?

A

Prior to survey crown bc it is more ideal to have already done tooth mods on all other teeth, then fabricate survey crown to develop ideal contours in relation to abutments and to utilize the contours of the other teeth (lab tech)

158
Q

Which is better, to make tooth mods before or after survey crown is inserted?

A

before

159
Q

Have these completed bf clinic for RPD pt:

A

mounted dx cast, surveyed, with drawn design (some faculty want mods done on duplicate cast), approved tx plan in Picasso, Chart design form, completed and signed

160
Q

Instruments to bring to a RPD appt:

A

surveyor, proper burs and polishers, snap stone, stock impression trays, alginate

161
Q

Common mistakes:

A

presenting tx plan to pt wo considering RPD design, make tooth mods prior to impression for survey crown, explain to pt the need for tooth mods

162
Q

Pts most likely to object to tooth mods;

A

those w prior RPDs

163
Q

How might the RPD design influence the overall tx plan?

A

need for survey crowns may not be obvious until surveying cast

164
Q

TF? Finalization of tx plan can be done before surveying dx cast.

A

F.

165
Q

Faculty to sign up w when working w RPD pts:

A

removable faculty

166
Q

Which faculty can approve RPD final design?

A

only removable faculty

Removable II (12 decks)

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