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Removable II > Before Midterm: Biomechanics of Partial Denture Design > Flashcards

Before Midterm: Biomechanics of Partial Denture Design Flashcards

1
Q

Which type of partial will move?

A

tooth supported

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2
Q

Tooth-tissue supported partials:

A

Class I, II, and IV

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3
Q

Residual ridge provides only ___% of the support compared to the PDL.

A

0.4

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4
Q

Soft tissues are ____ times more displaceable than the adjacent teeth

A

250

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5
Q

Thickness of periodontal membrane:

A

0.25mm

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6
Q

In Class I and II, occlusal loads caues;

A

displacement of distal extension

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7
Q

Force exerted on a Class ! or 2 tooth-tissue supported partial may cause:

A

distal tipping of abutment

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8
Q

Force exerted on a Class 4 tooth-tissue supported partial may cause:

A

displacement of anterior extension, mesial tipping of abutment

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9
Q

WHat do differences in tooth and soft tissue support result in?

A

nono-axial loading, damaging to abutments, moust be controlled

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10
Q

Non-axial loading can result in:

A

mobility and restoration failure

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11
Q

What does the force on abutment teeth depend on ?

A

ratio of tooth vs tissue support

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12
Q

Order of how effective the different class of levers are:

A

1st through 3rd

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13
Q

What class lever system can do greatest amt for work with least amt of effort

A

Class 1

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14
Q

Where is the object to be moved in relation to the fulcrum and force for a Class 1, most efficient, fulcrum?

A

opposite the force w the fulcrum in the center

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15
Q

This lever system represents the wheel barrel:

A

2nd class

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16
Q

This lever system represents a man fishing:

A

Class 3

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17
Q

What type of lever system is created with loading of distal extension base?

A

1st class lever

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18
Q

Where does rotation occur around a 1st class clever system?

A

around distal abutment

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19
Q

What does the framework rotation have a direct impact on?

A

clasp assembly

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20
Q

Consequence of poor clasp selection

A

overlioading abutment

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21
Q

Occlusal loading of the distal extension w a circumferential clasp causes:

A

rotation around fulcrum, retentive clasp to move superiorly, engaging the UC, causing the abutment to move distally (why distal?)

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22
Q

These forces are created when there is rotation about the fulcrum:

A

off axis forces

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23
Q

What can off axis forces lead to?

A

partial denture to start pulling abutment tooth posteriorly

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24
Q

TF? Circumferential clasps are recommended w a distal extension base

A

F. use stress releasing clasps (all infrabulge except for wrought wire clasp which is considered stress releasing)

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25
Q

TF? All stress releasing clasps are infrabulge clasps.

A

F. wrought wire is not infrabulge

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26
Q

Where does the framework fulcrum with occlusal loading of the distal extension for T clasp?

A

at the rest

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27
Q

Direction of forces w occ loading of distal extension with a T clasp:

A

M and apical, abutment moves M (down and forward)

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28
Q

What resists M movement of teh abutment with a T clasp distal extension?

A

mesial contact

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29
Q

Aspect of the T clasp assembly that decreases forces on the abutment tooth:

A

When retentive feature moves down it disengages form the UC

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30
Q

Location of the retentive feature of clasp:

A

right below rest

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31
Q

Occlusal loading of the distal extension w an I bar causes:

A

retentive clasp moves M and A, disengaging from UC

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32
Q

Where does the framework fulcrum with occlusal loading of the distal extension for I bar?

A

mesial rest

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33
Q

I bar is similar to which Class lever system?

A

Class II

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34
Q

Most favorable clasp for distal extension:

A

I bar (check)

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35
Q

Is the fulcrum anterior or posterior to the resistance in I bar clasp?

A

anterior

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36
Q

All distal extensions req one of these clasp types:

A

I bar, T clasp or circumferential

37
Q

Types of rests we could use for the abutment for the distal extension:

A

D or M-O (any others?)

38
Q

The longer the extension base, the greater the potential for:

A

damaging loads generated on the abutments

39
Q

Is the p[otential for damaging loads greater or less the further away from the abutment the forces are applied?

A

greater (check)

40
Q

Occlusal forces are (normally?) centered over these teeth:

A

2nd premolar and 1st molar

41
Q

These resist forces acting to dislodge prosthesis:

A

indirect retainers

42
Q

These resist rotational displacement of an extension bae away from the supporting tissues

A

idirect retainers

43
Q

Is it prefered to rotate about the fulcrum or the rest?

A

rest, down forces on real teeth, up force on fake teeth

44
Q

The additional of this to a framework will prevent rotation of the distal extension:

A

vertical stop (indirect retainer)

45
Q

Use these to counteract rotational forces:

A

indirect retainers

46
Q

Kennedy Classes that require indirect retention:

A

1, 2, 4

47
Q

Define fulcrum line:

A

runs thru the rest of the most distal abutment

48
Q

Where to place indirect retainer on the framework:

A

side opposite distal extension, perpendicular to fulcrum as far anterior as possible (meaning not perpendicular in some cases? ask) check), in a dfinitie rest seat

49
Q

Don’t place indirect retainer on these teeth

A

incisors

50
Q

Ideal teeth or indirect retainer placement:

A

canines, premolars (I would assume molars, too)

51
Q

Class II mod I with 3rd molar behind modification space, do you want the clasp on the molar to be retentive or non-retentive?

A

non-retentive

52
Q

Does a lingual plate provide indirect retention?

A

no

53
Q

Why doesn’t a lingual plate provide indirect retention?

A

bc the contact bw the lingula plate and the teeth occurs on inclined planes

54
Q

Indirect retention will never work if the contacting surfaces are on this type of plane:

A

inclined

55
Q

Clasp configuration of Class III arch:

A

Quadrilateral configuration, A and P to each edentulous span

56
Q

Clasp configuration of Class II arch:

A

Tripodal Configuration

57
Q

Clasp location for Class II arch with edentulous span on opposite side of arch:

A

adjacent to distal extension, A and P to edentulous span

58
Q

Clasp location for Class II arch wo edentulous span on opposite side of arch:

A

adjacent to distal extension, separate clasp assemblies on the intact side of arch

59
Q

Clasp configuration of Class I arch:

A

Bilateral

60
Q

Clasp configuration of Class I arch:

A

most posterior teeth + indirect, bilateral retainers

61
Q

Factors influencing stresses transmitted to abutment teeth:

A

length of edentulous span, quality of ridge support, claps design, occlusal factors, clasp flexibility

62
Q

Factors affecting clasp flexibility:

A

clasp length, diameter, taper and material used

63
Q

The more flexible the retentive arm of the clasp, the less/more load is transferred to the abutment

A

less

64
Q

Disadv of a flexible clasp:

A

less resistance to horizontal displacement, increasing non-axial loads to the edentulous ridge and other abutments

65
Q

Clasp recommended on abutments opposite fulcrum line:

A

wrought wire

66
Q

Flexibility of clasp is directly proportional to:

A

the cube of its length

67
Q

How to increase clasp length

A

by using a curved (instead of straight) path on a tooth (I don’t understand. check)

68
Q

This type of clasp is tapered from its origin to its tip:

A

retentive cast clasp

69
Q

Dimension of tip in relation to origin for retentive clasp:

A

about 1/2 it’s origin

70
Q

How many times more flexible are tapered clasps than non?

A

2X

71
Q

A clasp constructed of a _____ alloy places a greater load on an abutment than a alloy

A

chromium-based, gold-based

72
Q

A clasp constructed of a _____ alloy places a greater load on an abutment than a alloy

A

chromium-based, gold-based

73
Q

How do the diameters of the clasp arms compare bw chromium based and gold-based?

A

similar diamters

74
Q

How to increase the retentive force of a retentive clasp:

A

have it engage a greater angle of cervical convergence (theta)

75
Q

Any of these partials require indirect retainers:

A

tissue supported

76
Q

Where is the fulcrum placed for distal retainers?

A

around the distal rest

77
Q

Direction of movement of any portion of framework anterior to the fulcrum (rest) for the distal extension:

A

apically toward tissue

78
Q

TF? Tooth-tissue supported should have indirect retainer.

A

T

79
Q

Reasons to choose a non-retentive clasp vs. retentive for an edentulous span with teeth on either side:

A

Might be no UC’s, mobility, compromised tooth
(2nd molar with mobility - better to create parial including it in? Can we simply cut that clasp off when the tooth comes out? check ask)

80
Q

These provide indirect retention for Class IV partial:

A

rest seats

81
Q

TF? The lingual plate is a vertical stop.

A

F, no indirect retention

82
Q

To where does the lingual plate extend?

A

all the way through the posterior

83
Q

TF? Use quadrilateral configuration for Class II arch.

A

F. tripod

84
Q

How to increase horizontal stability of the partial:

A

Make clasp less flexible (shorter is the most common way to modify)

85
Q

Most common way to modify clasp flexibility:

A

clasp length

86
Q

What type of alloy is wrought wire?

A

chrome based

87
Q

More flexible, gold or base metal?

A

gold

88
Q

Material no longer used for framework anymore:

A

cast gold

89
Q

Greater flexure over a shorter amt of time requires more/less force to dislodge

A

less

Removable II (12 decks)

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