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Y2 RPD > CA1 TYS Learning Pts > Flashcards

CA1 TYS Learning Pts Flashcards

1
Q

(T/F) Roaches require less coronal modification than suprabulge clasps

A

T
- suprabulge clasp = c-clasp

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2
Q

(T/F) Suprabulge clasps will not impinge on vestibular tissues

A

T, shd only be on tooth

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3
Q

(T/F) Direct clasps must engage at least terminal 1/3 of undercut to be ideal

A

F (why tho)

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4
Q

(T/F) Mesial rest of the RPI system mitigates stress on the abutment tooth better than proximal rest

A

T

RPI System = Occlusal Rest, Distal Guide Plane, Gingivally approaching I bar
- basically udw the rest to be on the distal side then the tooth tilts distally & happens easily also cuz theres no adjacent tooth

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5
Q

(T/F) Mucosal borne dentures are usually made from Co/Cr.

A

F. (Made out of acrylic?)

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6
Q

(T/F) The fulcrum line passes through the two most posterior rests on the abutment teeth.

A

T

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7
Q

(T/F) Indirect retainers ought to be located at the posterior teeth for greater support

A

F (go read up on what indirect retainers are)

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8
Q

Which Kennedy classes require RPI?

A

KC II & III (why?)

RPI : rest(mesial), proximal plate(distal), i-bar(buccal)

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9
Q

Which of the following is not a type of rest?
1. Occlusal
2. Proximal
3. Cingulum
4. Overlays

A

Ans: Proximal

  • go study more on overlay denture rests, what r they?
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10
Q

What is not a criteria for selection of maxillary major connectors?

  1. Presence of palatal tori
  2. The need to stabilise weak teeth
  3. Depth of palate
  4. Location of edentulous areas
A

Ans: depth of palate is not a criteria of selection

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11
Q

A KC IV px is indicated for mandibular partial denture. He has extensive gingival recession and lingual tori is present. Which would be the major connector most suitable for this patients denture?

A

Lingual plate

  • used when there is insufficient lingual depth for bar
  • acts as indirect retainer, limiting denture rotation

Other answers not selected in the mcq: sublingual bar, lingual bar, labial bar

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12
Q

(T/F) Tooth replacement is always necessary in order for the patient to eat properly

A

F. A minimum of 10 pairs of teeth required for proper function, replacement not always needed.

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13
Q

(T/F) Having an RPD to replace loss of teeth helps in the transition to a complete denture.

A

T
- prolly due to training of neuromusculature

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14
Q

(T/F) Aesthetics of patient is a clinical factor that may affect the design and prognosis of the RPD

A

F
- it is a factor that will affect the design but it is not a clinical factor

  • other clinical factors: px’s age, oral hygiene, general health of patient, chemotherapy
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15
Q

The working/master cast is used for..

A

Fabrication of prosthesis
- master cast has to be accurate and reproduce all the fine details from the impression for the fabrication of prosthesis

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16
Q

List the purposes of surveying:

A
  1. Identify undercuts to be blocked out
  2. Locate existing/probable guide planes on abutment teeth
  3. Identify suitable path of insertion/withdrawal of denture
  4. Identify undercuts on teeth to aid retention of denture
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17
Q

(T/F) Full guide planes should be used on abutment teeth as it ensures the best possible path of insertion and withdrawal.

A

False
- full guide planes will put too much force on the abutment tooth
-
Guide planes:
- increase stability of denture and resistance to lateral movement
- direct the path of placement and removal of removable partial dentures.

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18
Q

(T/F) Guide planes can provide oblique or vertical path of insertion/removal

A

True

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19
Q

(T/F) Rests only help in dissipating vertical forces but not horizontal forces.

A

False
- rests help dissipate both vertical and horizontal forces

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20
Q

(T/F) Indirect retainers can take the form of rests.

A

True

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21
Q

(T/F) Rests can take the form of an overlay.

A

True

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22
Q

(T/F) Rests function to load transmission of forces through the longitudinal axis of the tooth.

A

True

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23
Q

Which component of RPD prevents displacement of denture bases by functioning through lever action on the opposite of the fulcrum line?

A

Indirect retainers
- assists in direct retainers doing so

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24
Q

(T/F) Should always use a full flange to provide as much support as possible

A

False
- over extension of flange may result in ulceration of soft tissues

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25
Q

(T/F) When choosing major connector to use, do not cover mucosa unnecessarily

A

True
- covering mucosa unnecessarily results in even more plaque retention

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26
Q

(T/F) Indirect retention is always needed

A

False
- indirect retention is only needed for free end saddles and long anterior saddles

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27
Q

(T/F) Use as many minor connectors as possible to stabilise the denture.

A

False

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28
Q

(T/F) Tilting the head backwards increases the Rest Vertical Dimension (RVD)

A

True
- gravity causes jaw to open slightly/lower slightly
-

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29
Q

(T/F) MMR should be recorded at a selected RVD with the mandible in the most retruded position

A

False
- MMR is recorded at OVD and not RVD

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30
Q

(T/F) MMR is recorded to determine the horizontal position of the upper and lower false teeth

A

True

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31
Q

(T/F) MMR is recorded to determine the midline/centre line around which the teeth are to be arranged

A

True

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32
Q

Which of the following is not a mechanism of RPD retention?
1. Muscular control
2. Chemical retention
3. Physical forces
4. Mechanical retention

A

Chemical retention

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33
Q

(T/F) Extent of guide plane on abutment tooth determines the magnitude of clasp retention

A

False
- guide planes are direct retainers that provide frictional resistance
- not part of the clasp

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34
Q

Which teeth are the best for tooth support?

A
  1. Canines
  2. 1st & 2nd molars
  • due to bulbous and long roots, most effective for axial loading
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35
Q

Which is not an indication for using the Lingual plate as a mandibular major connector?

  1. Extensive gingival recession
  2. Presence of inoperable lingual tori
  3. Support of periodontally weakened teeth
  4. Severe anterior crowding
A

Ans: Severe anterior crowding (contraindication for lingual plate)
- gingival recession has the same effect as high floor of mouth, thus, lingual plate can be used
- support of periodontally weakened teeth or mandibular teeth which may need replacement in the future are indications of lingual plate

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36
Q

Loss of ________ _______________ results in proximity of chin to nose.

A

Vertical dimension

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37
Q

A removable partial denture is a removable prosthesis that replaces one/more but not all of the _________ and __________.

A

Natural teeth and supporting structures

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38
Q

Debilitating health conditions may reduce oral tissue _______ to extra ________ ____________.

A

Oral tissue tolerance to extra occlusal loading

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39
Q

Loss of front teeth can cause the _______ to collapse while the loss of back teeth can cause _________ to collapse, resulting ________________________________.

A

Loss of:
Front teeth results in lip collapse
Back teeth results in cheek collapse
Loss of vertical dimension

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40
Q

The 2 main types of RPD are ________ & _________.

A

Cobalt-chromium & acrylic

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41
Q

(T/F) speech impairment is not a consequence of loss of posterior teeth

A

True
- is a result of loss of anterior teeth

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42
Q

(T/F) Tooth loss can further increase risk of periodontal disease

A

True

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43
Q

(T/F) master impression is done before primary impression

A

False
- primary impression is done first for primary cast for diagnosis
- thru diagnosis, treatment plan is made
- then u start w final impression for master cast

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44
Q

(T/F) RPD treatment can start w the patient having predisposed oral conditions

A

False
- any untreated dental problems should be properly treated prior to RPD treatment

45
Q

All the following are disadvantages of RPDs, except:
1. Enhanced plaque retention
2. Loads on remaining tissues
3. Components are potentially visible (during speech/smiling)
4. Occlusal forces will not be well distributed

A

4.
- occlusal forces will be better distributed w RPD

46
Q

(T/F) palatal bar is less rigid than a palatal strap

A

True

47
Q

(T/F) reciprocators usually engage undercuts

A

False

48
Q

Maximum enamel removal is ____mm

A

0.5mm

49
Q

(T/F) height of guide plane ranges from 2-4mm

A

True

50
Q

(T/F) cingulum rest should be placed at the most bulbous area of the cingulum

A

False
- should be placed at the flattest area of the the cingulum

51
Q

(T/F) floor of occlusal rest is spoon shaped

A

True

52
Q

The outline of occlusal rest should be ______________ shape

A

Rounded triangular shape

53
Q

(T/F) floor of an occlusal rest seat should be flat to ensure even distrubution of force

A

false
- angle formed by rest and minor connector is <90
- to direct occlusal load along the long/vertical axis of abutment tooth

54
Q

(T/F) enamel modification for cingulum rests should span from one marginal ridge to another

A

True

55
Q

(T/F) rests can be placed on any direct restoration

A

false

56
Q

The angle formed by rest and minor connector should be _____ than 90 degrees, so that occlusal load can be directed along the ____ axis of an abutment tooth

A

Less, long

57
Q

(T/F) preferred tooth to place cingulum rest is on the canines

A

True

58
Q

(T/F) clasp should have a lower modulus of elasticity than connector

A

True
- needs lower modulus of elasticity so that it is flexible enough to engage moderately deep undercuts

  • higher modulus of elasticity=> more rigid
  • connectors need higher modulus of elasticity
59
Q

(T/F) Chromium is responsible for corrosion resistance in CoCr alloys

A

True

60
Q

Purpose of burning out after investment of refractory cast is..

A
  1. Drive off moisture in mould
  2. Vapourize and eliminate wax pattern
  3. Expands mould to compensate for contraction of metal during cooling
61
Q

(T/F) wax used to block undercuts should have a melting temperature that is higher than 130 degrees

A

True
- e.g. kerr’s sprue wax

62
Q

Master cast for CoCr dentures should be poured in silky rock as..

A

Silky rock(type IV) is harder than dental stone(type III)

63
Q

(T/F) master cast should be poured in silky rock

A

True

64
Q

Master cast should be duplicated in..

A

Reversible hydrocolloid

65
Q

(T/F) refractory casts are not resistant to heat

A

False
- they need to be resistant to heat to withstand casting temperatures

66
Q

(T/F) refractory casts expand to compensate for shrinkage which occurs when metals cool

A

True

67
Q

(T/F) refractory casts are made of silica material

A

True
- either made of silica or phosphate bonded material

68
Q

(T/F) refractory casts are made of phosphate bonded material

A

True
- either of silica or phosphate bonded material

69
Q

(T/F) CoCr can be soaked in polident, which contains chlorine, as it has antibacterial properties

A

False
- chromium containing alloys will get attacked by the chlorine!

70
Q

List out some properties of CoCr alloys

A
  1. Resistant to corrosion
  2. High strength
  3. Rigid
  4. Low cost
  5. High melting point
71
Q

Which of the following is not a common metal material used in design of denture bases?
1. Cobalt chromium
2. Cobalt-nickel-chromium
3. Nickel chromium
4. Gold
5. Silver

A

ans: silver

72
Q

(T/F) connectors used in RPD set ups have a high modulus of elasticity and high proportional limit

A

True

73
Q

(T/F) one of the functions of burn out is to evaporate water off of the wax pattern so that further changes can be made to it

A

False

3 purposes
1. Drive off moisture from mould
2. Eliminate wax pattern
3. Expand mould to compensate for contraction of metal on cooling

74
Q

(T/F) when removing the refractory cast from the hydrocolloid, refractory cast should not be pulled away from the mould as the surface is soft and abrades easily

A

True
- cuz the surface of the cast? Is soft and abrades easily

75
Q

(T/F) bars are less rigid than straps

A

True

76
Q

(T/F) straps are able to provide support/bracing function

A

True

77
Q

(T/F) bars are useful for short-span bilateral tooth-borne RPDs

A

True

78
Q

(T/F) bars are able to provide support/bracing function

A

False
- bars are unable to provide support

79
Q

(T/F) survey lines are parallel lines on abutment teeth used for determining path of insertion

A

False

80
Q

(T/F) to improve retention, buccal and lingual clasp arms both need to engage undercut

A

False

81
Q

(T/F) to avoid food particle abrasion, major and minor connector must be designed to cover gingiva

A

False

82
Q

(T/F) indirect retention is impt for KC1 cases

A

True

83
Q

(T/F) embrasure and circumferential clasps are gingivally approaching retainers

A

False
- occlusal approaching

84
Q

(T/F) roach and I bar are occlusally approching retainers

A

False
- gingivally approaching

85
Q

(T/F) clasp assembly consists of the clasp, reciprocator, rest and major connector

A

False

Components of a clasp assembly
1. Rest
2. Retentive clasp arm
3. Reciprocal clasp arm
4. Minor connector
5. Proximal plate

86
Q

(T/F) in an RPI system, the I bar should always sit on the distobuccal surface

A

False

RPI system: rest, proximal plate, I bar

  • shd come frm mesial rest to reduce stress on abutment tooth during masticatory loading
  • so that tooth doesnt tilt
87
Q

(T/F) one of the main requirements of a major connector is rigidity

A

True

88
Q

(T/F) reciprocators and clasps shd engage more than 120 degrees of the tooth

A

True

89
Q

(T/F) in the RPI system, the I stands for I bar which will approach the abutment tooth distobucally

A

True

90
Q

(T/F) the minimum sulcus depth for roach is 4mm

A

True

91
Q

(T/F) a purpose of surveying is to ensure path of displacement is parallel to path of withdrawal

A

false
- u want paths to be different so that denture wont easily dislodge

92
Q

(T/F) a purpose of surveying is to identify the guide plane for retention

A

True

93
Q

A patient presents to you with only #34,35,43,44, what is his KC

A

Class 1 mod 1

94
Q

(T/F) a use of FWS is to estimate OVD for edentulous patients

A

True

95
Q

What is the definition of support

A

Resistance of denture to displacement by functional stress.

Supporting structure of the mouth are tissues which provide resistance to masticatory load transmitted by the denture.

96
Q

List out the denture components that help with support

A
  1. Rests
  2. Denture base and flanges
  3. Major connectors
  4. Clasps above survey line (esp ring clasps)
97
Q

Name 3 enamel modifications that need to be made before master impression

A
  1. Occlusal rests
  2. Cingulum rests
  3. Guide planes
  4. Rest seats for embrasure clasps
98
Q

Name 3 ways of obtaining retention

A
  1. Mechanical means
    - direct & indirect retainers
  2. Patient’s muscular control
  3. Physical forces
    - surface force (adhesion of saliva to denture & mucosa)
    - fluid force (surface tension, cohesive forces)
    - atmospheric pressure
99
Q

List 2 functions of rests

A
  • support
  • bracing
  • reciprocation
100
Q

List 2 functions of c-clasps

A
  • retention
  • support
  • bracing
101
Q

List 2 functions of guide planes

A
  • limit path of placement and removal
  • some retention
  • stabilisation against horizontal forces
102
Q

List 2 functions of major connectors

A
  • unify the components in an RPD
  • to distribute the occlusal loads from saddle to all abutment teeth and supporting soft tissue throughout the arch
  • to limit the potential denture movements and improve denture stability (support and bracing)
103
Q

List 3 factors that affect the choice of mandibular connector?

A
  • depth of alveolar ridge/lingual depth
  • presence of lingual tori
  • lingual inclination of remaining teeth
  • horizontal stability (bracing) & stress distribution (support)
  • need to stabilise weak teeth
  • anticipated loss of natural teeth
  • patients preference
104
Q

(T/F) indirect retention is impt for KCII

A

True

  • indirect retention is impt for KCI, II and for long span class IV cases
  • only not impt in KCIII cuz those are tooth supported, very short length, only on one side of arch
105
Q

Inadequate occlusal vertical dimension will result in all except:
1. Cheek biting
2. Angular cheilitis
3. Denture stomatitis
4. TMD
5. Wrinkles

A

TMD

106
Q

Functions of minor connectors:

A
  1. Unification
  2. Stress distribution
    - transfer stresses from major connector to other parts of RPD
  3. Bracing
107
Q

Define retention.

A
  • resistance of RPD to dislodgement
108
Q

Name 3 ways to affect flexibility of clasp

A
  1. Length of clasp
  2. Cross sectional form
  3. Diameter
  4. Material used
109
Q

(T/F) guide planes should be cut before rest seats

A

True

Y2 RPD (14 decks)

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