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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
TF? All stress releasing clasps are infrabulge clasps.
F. wrought wire is not infrabulge
26
Where does the framework fulcrum with occlusal loading of the distal extension for T clasp?
at the rest
27
Direction of forces w occ loading of distal extension with a T clasp:
M and apical, abutment moves M (down and forward)
28
What resists M movement of teh abutment with a T clasp distal extension?
mesial contact
29
Aspect of the T clasp assembly that decreases forces on the abutment tooth:
When retentive feature moves down it disengages form the UC
30
Location of the retentive feature of clasp:
right below rest
31
Occlusal loading of the distal extension w an I bar causes:
retentive clasp moves M and A, disengaging from UC
32
Where does the framework fulcrum with occlusal loading of the distal extension for I bar?
mesial rest
33
I bar is similar to which Class lever system?
Class II
34
Most favorable clasp for distal extension:
I bar (check)
35
Is the fulcrum anterior or posterior to the resistance in I bar clasp?
anterior
36
All distal extensions req one of these clasp types:
I bar, T clasp or circumferential
37
Types of rests we could use for the abutment for the distal extension:
D or M-O (any others?)
38
The longer the extension base, the greater the potential for:
damaging loads generated on the abutments
39
Is the p[otential for damaging loads greater or less the further away from the abutment the forces are applied?
greater (check)
40
Occlusal forces are (normally?) centered over these teeth:
2nd premolar and 1st molar
41
These resist forces acting to dislodge prosthesis:
indirect retainers
42
These resist rotational displacement of an extension bae away from the supporting tissues
idirect retainers
43
Is it prefered to rotate about the fulcrum or the rest?
rest, down forces on real teeth, up force on fake teeth
44
The additional of this to a framework will prevent rotation of the distal extension:
vertical stop (indirect retainer)
45
Use these to counteract rotational forces:
indirect retainers
46
Kennedy Classes that require indirect retention:
1, 2, 4
47
Define fulcrum line:
runs thru the rest of the most distal abutment
48
Where to place indirect retainer on the framework:
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
Don't place indirect retainer on these teeth
incisors
50
Ideal teeth or indirect retainer placement:
canines, premolars (I would assume molars, too)
51
Class II mod I with 3rd molar behind modification space, do you want the clasp on the molar to be retentive or non-retentive?
non-retentive
52
Does a lingual plate provide indirect retention?
no
53
Why doesn't a lingual plate provide indirect retention?
bc the contact bw the lingula plate and the teeth occurs on inclined planes
54
Indirect retention will never work if the contacting surfaces are on this type of plane:
inclined
55
Clasp configuration of Class III arch:
Quadrilateral configuration, A and P to each edentulous span
56
Clasp configuration of Class II arch:
Tripodal Configuration
57
Clasp location for Class II arch with edentulous span on opposite side of arch:
adjacent to distal extension, A and P to edentulous span
58
Clasp location for Class II arch wo edentulous span on opposite side of arch:
adjacent to distal extension, separate clasp assemblies on the intact side of arch
59
Clasp configuration of Class I arch:
Bilateral
60
Clasp configuration of Class I arch:
most posterior teeth + indirect, bilateral retainers
61
Factors influencing stresses transmitted to abutment teeth:
length of edentulous span, quality of ridge support, claps design, occlusal factors, clasp flexibility
62
Factors affecting clasp flexibility:
clasp length, diameter, taper and material used
63
The more flexible the retentive arm of the clasp, the less/more load is transferred to the abutment
less
64
Disadv of a flexible clasp:
less resistance to horizontal displacement, increasing non-axial loads to the edentulous ridge and other abutments
65
Clasp recommended on abutments opposite fulcrum line:
wrought wire
66
Flexibility of clasp is directly proportional to:
the cube of its length
67
How to increase clasp length
by using a curved (instead of straight) path on a tooth (I don't understand. check)
68
This type of clasp is tapered from its origin to its tip:
retentive cast clasp
69
Dimension of tip in relation to origin for retentive clasp:
about 1/2 it's origin
70
How many times more flexible are tapered clasps than non?
2X
71
A clasp constructed of a _____ alloy places a greater load on an abutment than a alloy
chromium-based, gold-based
72
A clasp constructed of a _____ alloy places a greater load on an abutment than a alloy
chromium-based, gold-based
73
How do the diameters of the clasp arms compare bw chromium based and gold-based?
similar diamters
74
How to increase the retentive force of a retentive clasp:
have it engage a greater angle of cervical convergence (theta)
75
Any of these partials require indirect retainers:
tissue supported
76
Where is the fulcrum placed for distal retainers?
around the distal rest
77
Direction of movement of any portion of framework anterior to the fulcrum (rest) for the distal extension:
apically toward tissue
78
TF? Tooth-tissue supported should have indirect retainer.
T
79
Reasons to choose a non-retentive clasp vs. retentive for an edentulous span with teeth on either side:
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
These provide indirect retention for Class IV partial:
rest seats
81
TF? The lingual plate is a vertical stop.
F, no indirect retention
82
To where does the lingual plate extend?
all the way through the posterior
83
TF? Use quadrilateral configuration for Class II arch.
F. tripod
84
How to increase horizontal stability of the partial:
Make clasp less flexible (shorter is the most common way to modify)
85
Most common way to modify clasp flexibility:
clasp length
86
What type of alloy is wrought wire?
chrome based
87
More flexible, gold or base metal?
gold
88
Material no longer used for framework anymore:
cast gold
89
Greater flexure over a shorter amt of time requires more/less force to dislodge
less

Removable II (12 decks)

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