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Removable Partial Dentures > BioMechanics/Design for Kennedy Class I and II > Flashcards

BioMechanics/Design for Kennedy Class I and II Flashcards

1
Q

_______ forces acting on teeth are thought to be biologically conducive to bone stimulation and periodontal health; these forces are distributed to the surrounding bone via Sharpey’s fibers.

A

Vertical

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2
Q

Forces ________ transmitted to teeth are destructive and apply prying or “lever-like” vectors

A

laterally

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3
Q

A distal rest, circumferential retainer and a distal extension = WHAT TYPE OF lever

A

Class I lever = destructive-lateral forces

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4
Q

***the SAGITTAL plane makes the ________ axis (aka ________ axis)

A

MedioLateral axis (transverse axis)

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5
Q

***the FRONTAL plane makes the ________ axis (aka _______ axis)

A

AnteriorPosterior Axis (sagital axis)

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6
Q

*** the HORIZONTAL plane makes the ________ axis

A

Vertical axis

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7
Q

IMPORTANT CONCEPT: The sagittal plane and its MedioLateral Axis when applying a down force are concerned with ______ of the denture (so rests and soft tissue)

A

SUPPORT

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8
Q

IMPORTANT CONCEPT: The sagittal plane and its MedioLateral Axis when applying an UP force are concerned with ______ of the denture (so rests and soft tissue)

A

Retention

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9
Q

IMPORTANT CONCEPT: What three components to an RPD are focused on retention when an upward force is applied via the Sagittal plane?

A

retentive arm, indirect retainer and soft tissue (some)s

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10
Q

IMPORTANT CONCEPT: The horizontal plane is concerned with _______ of the RPD. What are the three components that aid in this?

A

stability…minor connector, rest seats, soft tissue

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11
Q

IMPORTANT CONCEPT: the frontal plane is concerned with ________ of the RPD. What are the two components that aid in this?

A

stability…teeth and soft tissue

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12
Q

A ______ consists of a rigid bar, a fulcrum, an object to be moved, and an applied force

A

lever

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13
Q

A _____ class lever has the potential to be very efficient, and the _____ class lever the least efficient

A

first…third

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14
Q

Which three Kennedy classes function around levers?

A

I, II, IV

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15
Q

The ______ the extension base, the greater the potential for damaging loads to be generated on the opposite side of the fulcrum line

A

longer

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16
Q

WHICH FULCRUM?? Extends through two principle abutments, one on each side of the arch.

A

horizontal fulcrum (principle fulcrum line)

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17
Q

Which FULCRUM controls rotational movement of the denture in sagittal plane (denture movement toward or away from the supporting ridge)?

A

Horizontal Fulcrum (principle fulcrum line)

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18
Q

Which FULCRUM line extends through the occlusal rest on the terminal abutment and along the crest of the residual ridge, on one side of the arch.

A

Horizontal Fulcrum Line

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19
Q

Which FULCRUM line controls rotational movement of the denture in Frontal plane (a rocking movement over the crest of the ridge)

A

Horizontal Fulcrum line

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20
Q

Which FULCRUM line extends vertical just lingual to the anterior teeth and in the vicinity of the midline.

A

the vertical fulcrum

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21
Q

Which FULCRUM line controls rotational movement of the denture in horizontal plane??

A

the Vertical fulcrum line

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22
Q

Which FULCRUM line is almost entirely horizontal forces, so extremely damaging??

A

Vertical Fulcrum line

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23
Q

EVERY EFFORT should be made to keep a ________ as a vertical stop.

A

posterior abutment

24
Q

The thickness and health of the _________ influences the loads transferred to abutment teeth

A

mucoperiosteum

25
Q

Large, well formed _____ are capable of withstanding greater loads than are small, thin, or knife edged ridges

A

ridges

26
Q

The more _____ the clasp the less the force to the abutment tooth but the greater the forces to the residual ridge

A

flexible

27
Q

Which material clasp places a small percentage of the load on the abutment, and a greater percentage on the residual ridge?

A

Wrought Wire

28
Q

Framework must be fully SEATED for the clasp to be totally ________

A

passive

29
Q

________ clasp must contact the tooth before and while the retentive tip passes over the undercut

A

Reciprocal

30
Q

The longer the clasp the more flexible it is (Double the length will increase flexibility ___ times)

A

5 times

31
Q

A _______ based alloy will exert a greater load on the abutment teeth than will a gold alloy

A

chromium

32
Q

INTERESTING!!! The surface of a ______ restoration offers MORE frictional resistance to clasp arm movement than does the _______ surface of a tooth, therefore a crowned tooth experiences (GREATER/LESSER?) stresses than one with intact enamel!!

A

cast gold…enamel…GREATER

33
Q

REVIEW from Complete Dentures…What are the 2 primary bearing areas on the maxilla? What is the primary bearing area on the mandible?

A

Max: Hard Palate and ridge crests Mand: buccal shelves

34
Q

WHAT TWO LANDMARKS (1 Mx, 1Md) need to be covered by acrylic for support of the RPD???

A

the tuberosity on the maxilla, the retro-molar pad on the mandible

35
Q

What is the standard amount of undercut used for MOST clasps?? What about for the odd ball wrought wire?

A

0.01” for MOST…0.02” for WW

36
Q

What is the gauge of Wrought Wire?

A

18 gauge

37
Q

BOOO….Use ______ rests rather than ______ rests to reduce lever arm.

A

cervical RATHER THAN incisal

38
Q

Place RETENTIVE and RECIPROCAL clasps near the junction of the _______ and _______ thirds of the abutment.

A

middle and cervical

39
Q

DONE BE THAT PERSON!!!! Do not place retentive components anterior to the ________!

A

fulcrum line

40
Q

WHY NO Retentive clasp ANTERIOR TO the FULCRUM line?Clasp components located posterior to the fulcrum line axis move _______ during occlusal loading

A

gingivally

41
Q

WHY NO Retentive clasp ANTERIOR TO the FULCRUM line? Clasp components located anterior to the fulcrum line axis move ________ during occlusal loading

A

occlusally

42
Q

During function: The Akers clasp arm and proximal plate move in a __________ direction disengaging from the tooth

A

mesiogingival

43
Q

As an occlusal load is placed the I bar clasp arm and the proximal plate move in a ________ direction disengaging from the tooth

A

mesiogingival

44
Q

IFFF Retention is to be used ANTERIOR to the fulcrum line, a _______ (______) clasp is the only acceptable retainer.

A

wrought wire (combination)

45
Q

A retainer ANTERIOR to the fulcrum line: A wrought wire will limit the torquing action due to its _______

A

flexibility

46
Q

WHAT ARE THE 4 components of an RPD that provide SUPPORT????

A

1.Rest 2.Major Connector 3.Denture base 4.Teeth through the base

47
Q

These components…..Guide Plate (Proximal Plate) Lingual Plates, Rest, Rigid portions of retainers, Direct Retainers,
Major Connector, Minor connector, Denture Bases …….are all providing ________

A

Stability

48
Q

What are the two components of an RPD providing RETENTION?

A

1.Direct Retainers 2.Guide plate (proximal plate)

49
Q

In a Kennedy Class I or II, what are the 3 times you CANNOT use an RPI??? What would you turn to instead?

A

1.Frenum 2.Shallow Vestibule 3.Deep soft tissue undercut…use an RPA!

50
Q

IN a Kennedy Class I or II, what are the 3 times you CANNOT use an RPA? What would you use instead?

A

1.Rotation 2.heavy centric contact on mesial 3.Large amalgam restoration on mesial…use a COMBINATION clasp

51
Q

A distal guiding plane EXTENDS FROM the ________ to the junction of the ______ and ______ thirds of the abutment tooth. (SO it leaves a GAP on the gingiva!!)

A

MARGINAL RIDGE to the junction of the MIDDLE and GINGIVAL thirds

52
Q

RPI: The proximal plate, in conjunction with the minor connector supporting the rest, provides the ________ and ________ aspects of the clasp assembly

A

STABILIZING….RECIPROCAL

53
Q

RPI: The area of contact, along with the rest and proximal plate contact, provides stabilization through _________.

A

encirclement

54
Q

I BAR: The HORIZONTAL portion of the approach arm must be located at least ___mm from the gingival margin

A

4mm

55
Q

With the RPA clasp system the circumferential clasp is placed so that the rigid portion of the clasp arm will contact the tooth only along its _______ border at the level of the survey line.

A

superior

Removable Partial Dentures (7 decks)

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