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Flashcards in RPD II Deck (109):
1

How is the Tx plan for an RPD pt finalized?

Diagnostic Assessment

*with casts

2

T/F
You might need to remove Tori surgically before making an RPD

True

3

What is the final mouth prep alteration done before accepting the definitive RPD design?

Alteration of Abutment contours

*can only be limited changes in enamel

4

How are major contour changes prior to RPD definitive design accomplished?

Crown

5

T/F
Rest seats are done entirely in enamel

True

6

T/F
Because rest seats are done entirely in enamel anesthesia is avoided so pt can tell dentist when sensitivity is felt

True

7

Prepare occlusal rest seats with medium round burs # ___ or # ___

#2 or #4

8

Tooth prep sequence (3 things):

Guide Planes

Enameloplasty

Rest seats

9

T/F
Undercuts should be gentle when making enameloplasty

True

10

M/D measurement for Rest Seats:

2.5 mm

11

T/F
Alternative cingulum rests are smile shaped

True

12

For a Master Cast: How much space should be in the Custom Tray made by light cured resin?

How is this attained?

2 mm

Wax spacer

13

How many pounds should stone be vacuumed under?

27 lbs

14

In what 2 cases would you use Record Bases?

Not enough teeth for stable interdigitation

if mount in CR

15

T/F
Making Record Base: Blue line at vestibule depth, , adapt 15 mm strip of Triad, cut with Bard Parker knife

True

16

T/F
Do not remove material from the Intaglio Surface of a Record Base

True

17

How much space should there be between the Record Base and the opposing teeth?

1-2 mm

18

2 options for making a bite registration for a Record Base:

Notch ridge and apply PVS (Regisil), trim to cusp tips

Notch ridge and apply Aluwax, trim to cusp tips

19

Most states require lab work authorizations to be made in ______

Duplicate

(both dentist and laboratory must keep on record for specified period)

20

Cobalt - Chromium:
According to ANSI/ADA Specification 14, weight of chromium shouldn't be less than ____%

Total weight of chromium, ____, and _____, should be no less than ______

20%


cobalt, nickel, 85%

21

Alloys used in RPD's must comply with requirements to what 3 factors?

Toxicity

Hypersensitivity

Corrosion

22

Alloy minimum value for elongation:

Yield Strength:

Elastic modulus:

1.5%

500 MPa

170 GPa

23

3 elements accounting for 82 - 92% of weight for most dental restoration alloys?

Chromium

Cobalt

Nickel

24

T/F
Chromium, Cobalt, and Nickel have relatively little effect on alloy properties

True

*properties determined by carbon, molybdenum, beryllium, tungsten, and aluminum

25

When Chromium content is above ___%, the alloy is difficult to cast and forms a ____ phase

30%

brittle

26

Of the 3 main elements in RPD alloy, which 2 are interchangeable?

Which one increases elastic modulus, strength, and hardness a little more?

Cobalt and Nickel

Cobalt

27

T/F
Increasing Carbon content is a good way to increase hardness of alloy

True

.2% change can make alloy unusable

28

T/F
Molybdenum decreases strength of alloy

False

*increases

29

What incorporates a curved, arcuate, or variable path of placement allowing one or more of the rigid components of the framework to gain access to and engage an undercut?

Rotational Path RPD

30

3 Categories of Rotational Path RPD's

Posterior to Anterior

Anterior to Posterior

Lateral to Lateral

31

When is the Altered Cast Method for impression making often used?

Mandibular distal extension arch forms

32

What procedure compensates for greater soft tissue displacement of the Mandible and is seldom used in the Maxilla?

Altered Cast

33

The goal of the Altered Cast is to more accurately record the soft tissues with a _______ impression

second

34

Gingival stippers, flippers, muco-adhesion RPD's aks...

Provisional RPDs

35

Patrix into Matrix is an example of what?

Attachment Retained RPD

**precision attachment

36

In a precision Attachment Retained RPD, where is the receptacle usually located?

Fitting part?

Crown of Abutment tooth (matrix)

Pontic or Denture framework (patrix)

37

Matrix and Patrix can be switched in Extracoronal Locator Attachment

True

38

A Master Cast or Diagnostic Cast should have a minimum cross section of ___ to ____ mm through its narrowest section

10-12mm

39

T/F
Preprosthetic surgery includes removal of gross bony undercuts, enlarged tuberosities, large tori

True

40

If there is inflammation/irritation, distortion of anatomic features (rugae, etc) or a burning sensation of ridges, tongue, cheeks, lips - what is needed?

Conditioning of Abused/Irritated tissues

*remove insult, adjust denture

41

What are 3 preps for Abutment Teeth?

Enameloplasty

Existing restoration

New restoration (Survey Crown)

42

Class III guide planes should be how tall?

Class I or II?

2-4 mm

1.5-2 mm

43

Tooth prep sequence on Enamel/Existing Restorations:

4 steps

Prep guide planes

Modify contours

Alginate

Rest seat prep

44

When should the need for crowns on abutment teeth for RPD's be established?

Diagnosis/Tx planning phase

45

Extensive caries, heavily restored teeth, ______ treated teeth, recontouring, ______, and intra or extra _____ attachments

All are indications for Survey Crowns:

Endodontically

Splinting

Coronal

46

Patrix to Matrix intracoronal attachment must have enough ______ on the survey crown

Occlusal space

47

RPD survey crown sequence of tooth prep:

(4 steps)

Prox/lingual guiding planes

Proximal box

Final prep

Full arch impressions

48

T/F
Take a Survey Crown with a Triple Tray

False

***Full Arch Impression (never triple tray)

49

RPD Survey Crown wax pattern formation (5 steps):

Guiding plane

Retentive undercut

Reciprocating arm

Rest seat

Cutback for PFM

50

How deep should rest seats be on a Survey Crown?

Survey Crown embrasure Rest Seat depth?

1.5 mm

2 mm

51

Prior to cementation what should be done to a Survey Crown?

Survey

52

What are the 2 reasons to use a Custom Tray for Final RPD Impressions?

Increases accuracy (less tissue displacement)

Lowers cost (less matl used)

53

Shaping the border of a custom tray by manipulating the tissues adjacent to the borders to duplicate the contour and size of the vestibule:

Border Molding

54

Metal Alloys must meet what 5 criteria for RPD's?

Biocompatible

Biologically inert

Versatile (castability)

Rigidity

Resilient (proper give/flex)

55

Type IV gold (extra hard):

Low gold:

75% or greater Au and Pt

less than 75% Au and Pt

56

Cobalt Chromium %'s

***most common

60% cobalt

30% chromium

5% molybdenum

57

Nickel Chromium %'s

*less common

65% nickel

16% chromium

9% Molybdenum

58

T/F
Nickel Chromium is more common than Cobalt Chromium

False

59

What increases strength, hardness, and casting temp?

What increases ductility, decreases strength and casting temp?

What increases corrosion resistance?

Cobalt

Nickel

Chromium

60

3 advantages to Base Metal Allow vs Gold:

2 advantages:

Decrease weight, cost, Increase corrosion resistance

casting technique, clasp adjustability

61

T/F
Gold must be thicker to achieve same rigidity and therefore has more bulk in pts mouth

True

62

The addition of what will cause the Framework or an RPD to seat tighter and prevent food impaction?

Bead lines

63

3 Types of Block Out:

Shaped (follows contour)

Parallel (guide planes)

Arbitrary (undercuts could be anywhere)

64

To make a Framework, you make a _____ cast from a duplicate master cast, wax up, add _____ and Invest with ______

(then burn out the wax pattern and cast framework)

Refractory

Sprue

Ethyl Silicate

65

The Ethyl Silicate Investment is removed from the casted framework with what?

sand blaster

66

T/F
The framework can be electrolytically polished

True

67

T/F
You can section and solder a frame that isn't fitting correctly

True

68

What is the step after fabrication?

Try in

*must be passive fit

69

If the impression is distorted, the framework will not fit ______

Passively

70

3 Types of Indicating Medium for Framework Insertion/Adjustment:

Aerosol spray (doesn't convey distance)

Disclosing Wax (conveys distance)

Silicone (Fit Checker - expensive)

71

T/F
With opposing frameworks, adjust the arches together

False

**individually, then together

72

Show through means you have what?

Incompletely seated framework

73

A negative likeness of a portion/portions of edentulous denture bearing areas made independent of and after the initial impression of natural teeth - employs impression tray attached to RPD framework.

Altered Cast Impression

74

An Altered Cast Impression must capture what 2 things?

How?

Anatomic Ridge Form - frame impression

Functional/Supporting Ridge Form - selective pressure

75

A custom tray should be ___ mm short of the vestibule

2-3 mm

76

An Altered Cast gives you ______, not ______ of the Edentulous Ridge

Functional form

Anatomical form

77

An Occlusal Record is taken with what?

Record Base and Wax Occlusal Rim

78

The final record in the Record Base/Wax Occlusal Rim should have how much separation from wax to teeth?

1-2 mm

79

Complete Natural Dentition has what type of Occlusion?

Partial Edentulism?

Complete Edentulism?

MIP

MIP or MIP=CR

MIP=CR

80

The best fit for the teeth regardless of Condylar Position:

MIP

81

CR:

superior/anterior position of condyle

82

You should always mount the occlusal relationship by considering which arch?

Weaker

83

Tooth borne RPD vs Natural Dentition:

Tooth borne RPD vs Complete Denture

Tooth mucosa RPD vs Natural Dentition

Tooth mucosa RPD vs Complete Denture

Tooth mucosa RPD vs Tooth mucosa RPD

MIP

CR (balanced occlusion)

MIP

CR

CR

84

CR should be in Balanced Occlusion in _____ positions while MIP should provide working side contacts in what positions?

Eliminate what interferences?

Eccentric

Eccentric

Excursive

85

3 methods to establish occlusal relationships:

Hand articulate

Interocclusal reg

Record bases w/ interocclusal reg

86

What denture tooth material is most often used?

What isn't used any more?

Acrylic resin

Porcelain

87

Replacement teeth should oppose natural teeth with minimal wear and what tooth form?

22 or 33 degree cuspal inclination

88

External finish line:

Internal finish line:

undercut

butt joint (90 degrees)

89

RPD acrylic resin added how?

Wax up, invest, burnout, acrylic resin mixed, adapted

90

3 steps in delivery of RPD:

Denture base fit

Correct occlusion

Adjust retentive clasps

91

How is the Intaglio of the denture base checked?

Same direction PIP

(pressure indicating paste)

92

What 2 materials are used to detect pressure spots in an RPD?

Where are they used?

PIP for Intaglio

Disclosing wax for edges of denture borders

93

What should you do if there are large occlusal discrepancies?

Clinical Remount

94

Adjust Clasp with Bird Beak, what technique?

Adjust Clasp with Three Prong, what technique?

hold pliers and move frame

squeeze gently

95

2 reasons not to use bleach:

pores on acrylic resin

corrode metal

96

3 post delivery adjustment time scale:

24 hours

72 hours

1 week

97

After 24 hour, 72 hour, and 1 week adjustments to RPD's, what is the recall schedule after that?

6 month hygiene

annual periodic (clinical/radiographic)

98

Resurfacing the tissue side of RPD w/ new base matl

Reline

99

Lab process of replacing entire denture base matl on existing prosthesis

Rebase

100

2 Types of Reline:

Direct

Indirect

101

T/F
Denture base repair by opening up, repair resin, cure in vacuum

True

102

RPD designed for esthetics, stabilization/function used for limited time
(often used to assist determination of therapeutic effectiveness prior to definitive prosthesis)

Interim RPD

103

Interim RPD that adds artificial teeth upon loss of natural teeth

Transitional RPD

104

Prosthesis to treat/condition tissues

(placed in prep for future therapy)

Treatment RPD

105

Examination and Diagnosis

Survey/design of diagnostic casts

Tx plan

Mouth prep

Final impressions

Survey/design master casts

Work authorization form

RPD Tx sequence

106

Framework try-in

Altered cast impression

Record bases

JRR

Esthetic tooth try in

Processing

Lab remount

RPD Tx sequence

107

Finish/polish

Clinical remount at delivery

Post op instructions

Post delivery adjustment

RPD Tx sequence

108

the distal extension should go how far onto the Retromolar Pad?

1-2 mm

109

Clean once a day

Remove at night

No bleach

RPD post op instructions

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