RPD Survey and Design (Lecture 2-Part 2)

Question 1

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

Answer 1

Height of Contour

Question 2

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

Answer 2

an abutment

Question 3

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

Answer 3

Infra bulge/undercut

Question 4

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

Answer 4

Retention

Question 5

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

Answer 5

Precision

Question 6

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

Answer 6

supraBULGE

Question 7

________ retainers - Those that approach the undercut from below

Answer 7

infraBULGE

Question 8

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

Answer 8

Direct Retainer

Question 9

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

Answer 9

SUPPORT

Question 10

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

Answer 10

Stabilization

Question 11

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

Answer 11

RETENTION

Question 12

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

Answer 12

ENCIRCLEMENT

Question 13

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

Answer 13

Recaprocity

Question 14

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

Answer 14

Passivity

Question 15

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

Answer 15

assemblies

Question 16

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

Answer 16

circumferential

Question 17

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

Answer 17

supra!

Question 18

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

Answer 18

supra!

Question 19

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

Answer 19

InfraBulge

Question 20

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

Answer 20

SupraBulge

Question 21

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

Answer 21

SupraBulge…creates a CLASS I LEVER EFFECT

Question 22

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

Answer 22

length…taper

Question 23

The Clasp _______ is INVERSELY proportional to its flexability

Answer 23

DIAMETER

Question 24

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

Answer 24

Round is more flexible, but half round is the standard

Question 25

Which is the most adjustable and flexible clasp metal type?

Answer 25

whoght wire

Question 26

What is the alternate name for a circumferential clasp?

Answer 26

Akers clasp

Question 27

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

Answer 27

gingival and middle thirds (esthetics?)

Question 28

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

Answer 28

middle third

Question 29

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

Answer 29

reciprocal

Question 30

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

Answer 30

Reverse Action (Hair Pin) clasp

Question 31

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

Answer 31

Embrasure clasp

Question 32

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

Answer 32

Embrasure clasp

Question 33

Bar clasps are always which type of bulge?

Answer 33

infraBulge

Question 34

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

Answer 34

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

Question 35

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.

Answer 35

mesially

Question 36

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

Answer 36

class II...class I

Question 37

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

Answer 37

0.01" (0.01 inches)

Question 38

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.

Answer 38

2mm..2mm

Question 39

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

Answer 39

3mm

Question 40

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

Answer 40

DISTAL

Question 41

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

Answer 41

RPI clasp

Question 42

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

Answer 42

2/3...infra

Question 43

In an RPA the C-Clasp originates from the ________

Answer 43

distal guide plate

Question 44

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

Answer 44

retentive retainer

Question 45

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

Answer 45

18 guage

Question 46

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

Answer 46

middle and gingival...0.02”

Question 47

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

Answer 47

1.Tooth stuff 2. Support tissues 3.Esthetics

Question 48

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

Answer 48

Indirect Retainer

Question 49

Indirect Retainer: Resists displacement away from the ________

Answer 49

distal extension

Question 50

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

Answer 50

FULCRUM LINE

Question 51

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

Answer 51

ANTERIOR....PERPENDICULAR

Question 52

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

Answer 52

denture base. YOU KNOW IM ALL ABOUT THAT BASE.

Question 53

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.

Answer 53

Class I and II extend that shit...Class III and IV don't need to

Question 54

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

Answer 54

1.5mm to 2mm

Question 55

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

Answer 55

retromolar pad

Question 56

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

Answer 56

5-7mm...10mm

Question 57

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

Answer 57

3-4mm

Question 58

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

Answer 58

3-4mm

Question 59

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

Answer 59

4-5mm

Question 60

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

Answer 60

free gingival margin

Question 61

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

Answer 61

Tissue Stop

Question 62

A tissue stop permits encirclement of the _________ with acrylic.

Answer 62

minor connector

Question 63

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

Answer 63

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

Question 64

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

Answer 64

Tissue Stop

Question 65

TERM: An integral part of the minor connectors. | They provide stability to the framework during the stages of transfer and processing

Answer 65

Tissue Stop

Question 66

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

Answer 66

90 degree..butt joint

Question 67

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

Answer 67

LESS than 90 degree jxn