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Removable Partial Dentures > RPD Survey and Design (Lecture 2-Part 2) > Flashcards

RPD Survey and Design (Lecture 2-Part 2) Flashcards

1
Q

TERM: A line encircling a tooth, designating its greatest circumference at a selected position determined by a dental surveyor

A

Height of Contour

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2
Q

QUIZ Q A tooth, a portion of a tooth or a portion of an implant that serves to support and /or retain a prosthesis

A

an abutment

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3
Q

That portion of a tooth that lies between the height of contour and the GINGIVA

A

Infra bulge/undercut

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4
Q

QUIZ!!! ______ is the ability of a removable partial denture to resist dislodging forces during function.

A

Retention

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5
Q

Intra-Coronal ________ Attachments: Mechanical devices set into the casting of a full crown. Provide exceptional esthetics over extracoronal retainers

A

Precision

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6
Q

_______ retainers – Those that approach the undercut from above the height of contour

A

supraBULGE

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7
Q

________ retainers - Those that approach the undercut from below

A

infraBULGE

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8
Q

TERM: Component of a removable partial denture used to retain or prevent dislodgment; consists of a clasp assembly or precision attachment.

A

Direct Retainer

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9
Q

Requirements for a Direct Retainer1. _______-Prevents RPD movement TOWARD the tissue (function of rests).

A

SUPPORT

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10
Q

Requirements for a Direct Retainer2. _______ - Resistance to HORIZONTAL components of force (minor connectors and occlusal rests).

A

Stabilization

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11
Q

Requirements for a Direct Retainer 3. _______ -Resistance to dislodgement in a vertical or occlusal direction (retentive arm, direct retainer).

A

RETENTION

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12
Q

Requirements for a Direct Retainer 4. _______- >180° (prevents tooth movement).

A

ENCIRCLEMENT

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13
Q

Requirements for a Direct Retainer 5. ________-Counteracts the force of the retentive clasp during seating.

A

Recaprocity

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14
Q

Requirements for a Direct Retainer 6. _______- The clasp should not place any force on the tooth when the RPD is completely seated.

A

Passivity

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15
Q

Clasp ________ (arrows) grasp the associated abutments and resist removal of the prosthesis.

A

assemblies

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16
Q

A ________ clasp assembly includes a rest (a), a retentive arm (b), and a reciprocal arm (c)

A

circumferential

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17
Q

Which has less potential food impaction-supra or infra bulge?

A

supra!

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18
Q

Which is more difficult to adjust-supra or infra bulge?

A

supra!

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19
Q

These are contraindications for WHICH TYPE of retainer arm? Insufficient vestibular depth, Deep tissue undercut, Lack of facial undercut, Mesial tooth inclination

A

InfraBulge

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20
Q

These are contraindications for WHICH TYPE of retainer arm? Terminal abutments of distal extension RPD’s because of the class I lever effect, High esthetic demand areas

A

SupraBulge

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21
Q

Which retainer arm design is CONTRAINDICATED in terminal abutments of DISTAL extension RPD’s? WHYYY??

A

SupraBulge…creates a CLASS I LEVER EFFECT

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22
Q

Clasps: increased ______ increases flexibility and its is measured from the point where the _____ begins

A

length…taper

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23
Q

The Clasp _______ is INVERSELY proportional to its flexability

A

DIAMETER

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24
Q

In a cross section of a clasp arm, which form is usually more flexible? Which is the standard design?

A

Round is more flexible, but half round is the standard

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25
Q

Which is the most adjustable and flexible clasp metal type?

A

whoght wire

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26
Q

What is the alternate name for a circumferential clasp?

A

Akers clasp

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27
Q

Ideally, the terminus of the RETENTIVE clasp should be positioned no further occlusally than the junction of the ______ and _______ of the tooth

A

gingival and middle thirds (esthetics?)

28
Q

Ideally, the BRACING arm or RECIPROCAL clasp should be positioned in the ________ of the tooth

A

middle third

29
Q

The ________ clasp arm is thought to BRACE the tooth during SEATING of the retentive clasp arm in the planned undercut.

A

reciprocal

30
Q

TERM: The retentive area is adjacent to the occlusal rest, The upper arm is a minor connector giving rise to tapered lower arm, Super-bulge clasp

A

Reverse Action (Hair Pin) clasp

31
Q

What is the Retainer Clasp type we will frequently use in Class III situations?

A

Embrasure clasp

32
Q

Which clasp?: Two rests, two retentive arms, two bracing arms

A

Embrasure clasp

33
Q

Bar clasps are always which type of bulge?

A

infraBulge

34
Q

What are the three types of Stress releasing clasp assemblies? What is the order of priority?

A
  1. RPI (M rest, D plate, I Bar) 2.RPA (Mesial Rest, D Plate, Akers (circumferential)) 3.Combination Clasp
35
Q

Mastication: Because of the mesial-occlusal placement of the RPI rest, the I-bar will swing _______ and disengage the abutment tooth releasing any torquing forces.

A

mesially

36
Q

Moving the occlusal rest to the mesial aspect of the abutment tooth from the distal produces a ______ lever system rather than a _____.

A

class II…class I

37
Q

The I bar clasp requires a ____” (____ inches) undercut, midbuccally, and extends from the this amount undercut to the survey line.

A

0.01” (0.01 inches)

38
Q

The approach arm of the I bar should taper from its origin to its terminus with no more than __mm of its tip contacting the abutment. The apical contact of the I bar should be at least __mm from the FGM.

A

2mm..2mm

39
Q

The approach arm to the I bar is located as far apically as possible with its superior aspect a minimum of ___mm from the FGM

A

3mm

40
Q

WE DO NOT want the i bar to be WHICH DIRECTION from the HOC of the tooth?

A

DISTAL

41
Q

What are these CONTRAINDICATIONS for??1. Abnormally tipped teeth, especially lingually, No labial undercut 2. High frenum attachments 3. Large bony and soft tissue undercuts which would create large food traps 4. Insufficient depth of the vestibule 5. Distal buccal undercut

A

RPI clasp

42
Q

RPA-Approximately _____ of the superior surface of the circumferential clasp is positioned at the survey line; the terminal third of the clasp then drops below the survey line into the 0.01” undercut… This is an _____-bulge clasp

A

2/3…infra

43
Q

In an RPA the C-Clasp originates from the ________

A

distal guide plate

44
Q

The benefit of the combination clasp is primarily a reduction in stress on a weak abutment or when it is desirable to place a ________ ANTERIOR to the fulcrum line

A

retentive retainer

45
Q

Combination Clasp: The material selected is usually ___ gauge PGP wire (Pt-Au-Pd)

A

18 guage

46
Q

Combination clasp-The terminus is placed below the junction of the _______ and _______ thirds of the tooth crown into a mesial ____” undercut

A

middle and gingival…0.02”

47
Q

What are the three MAIN factors when selecting a direct retainer?

A

1.Tooth stuff 2. Support tissues 3.Esthetics

48
Q

TERM: A part of a removable partial denture that prevents ROTATIONAL displacement of the denture about the rests of the principle abutment teeth

A

Indirect Retainer

49
Q

Indirect Retainer: Resists displacement away from the ________

A

distal extension

50
Q

What is the axis that passes through rests of the most posterior abutment teeth??

A

FULCRUM LINE

51
Q

Indirect Retainers….. should be as far _______ to the fulcrum line as possible and _________ to it

A

ANTERIOR….PERPENDICULAR

52
Q

A _________ spans an edentulous area and provides a platform for prosthetic teeth

A

denture base. YOU KNOW IM ALL ABOUT THAT BASE.

53
Q

Denture Flange: Class ___ and ___ extend that shit as much as possible for support and retention, but for class ___ and ___ don’t need to extend for retention.

A

Class I and II extend that shit…Class III and IV don’t need to

54
Q

For GRIDWORK…What is the MINIMUM width for STRUTS no matter which arch?

A

1.5mm to 2mm

55
Q

On a mandibular Class I or II, the most distal strut will be placed at the base of the _________.

A

retromolar pad

56
Q

On a mandibular Class I or II, Distance between struts is approximately ___-___mm for premolars and about ___mm for molars.

A

5-7mm…10mm

57
Q

Mandibular: Lingual horizontal struts should be placed about __-__mm superior to the inferior border of the major connector.

A

3-4mm

58
Q

Mandibular: Facial horizontal struts should be placed about ___-___mm facial (inferior) to the crest of the ridge.

A

3-4mm

59
Q

Maxillary: Facial horizontal struts should be placed __-__mm facial to the crest of the ridge.

A

4-5mm

60
Q

Maxillary: Lingual horizontal struts should be placed to follow an imaginary line of the ______ prior to extraction.

A

free gingival margin

61
Q

This relief provides space between the minor connector and the residual ridge of the master cast

A

Tissue Stop

62
Q

A tissue stop permits encirclement of the _________ with acrylic.

A

minor connector

63
Q

While a TISSUE STOP works great with a ________ RPD, it must be modified for a _________ RPD

A

tooth supported (class III and IV)….distal extension (class I and II)

64
Q

TERM: To prevent bending, a small area at the free end of the minor connector should contact the master cast

A

Tissue Stop

65
Q

TERM: An integral part of the minor connectors.

They provide stability to the framework during the stages of transfer and processing

A

Tissue Stop

66
Q

Internal finish lines (gingival side of acrylic-metal junction) have a ___ degree junction.

A

90 degree..butt joint

67
Q

External finish lines (occlusal side of acrylic-metal junction) have a ___ degree junction.

A

LESS than 90 degree jxn

Removable Partial Dentures (7 decks)

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