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Removable Partial Dentures > Principles of Surveying > Flashcards

Principles of Surveying Flashcards

1
Q

Paralleling Instrument

used in RPD fabrication

A

DENTAL SURVEYOR

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2
Q

What are the leveels of undercut gages

A
  1. 01
  2. 02
  3. 03
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3
Q
  • Survey diagnostic cast
  • Contour wax patterns
  • Contour ceramic & cast restorations
  • Place attachments requiring parallelism
  • Survey master cast
A

FUNCTIONS OF DENTAL SURVEYOR

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4
Q

What are the objectives of surveying a cast?

A
  1. Determine the most acceptable path of insertion
  2. Identify proximal tooth surfaces that can function as guiding planes
  3. Locate & measure areas of teeth that may be used for
    retention
  4. Determine if soft or bony areas of interference (undercuts) exist
  5. Determine most suitable path of insertion to satisfy
    esthetics
  6. Delineate height of contour on abutment teeth
  7. Record cast position to selected path of insertion (Tripod cast)
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5
Q

What is the order of the survey procedure?

A
  1. Path of Insertion Determined 2. Mark the Height of Contour/Survey Line
  2. Measure/Mark Retentive Undercut
  3. Tripod Cast
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6
Q

How is the path of insertion determined?

A

Based on Guiding Planes, Retentive Undercut, Interferences, Esthetics

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7
Q

The direction in which the RPD is inserted & removed from the abutment teeth.

A

PATH OF INSERTION

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8
Q

Four factos of ______ __ ______ includes:

  • Guiding Planes
  • Retentive Undercuts
  • Interferences
  • Esthetics
A

Path of insertion

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9
Q

_____ _____:
• Parallel, flattened surfaces at proximal or axial surfaces of teeth

• Contact minor connectors, guiding plates

A

guiding planes

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10
Q

t/f: the greater number of GPs = a more specific path of insertion

A

true

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11
Q

t/f: Guide planes function to increase RPD stability and retention

A

true

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12
Q

____ ____ used to identify potential
surfaces that can be converted to guiding
planes by selective grinding in occlusal 1/3-
1/2

A

Analyzing rod

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13
Q

With the anylzying rod, the Final orientation seldom - degrees from horizontal

A

> 10-15°

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14
Q

RPD mechanical retention provided by clasp that engages
_____ ______.

Resist RPD dislodging forces.

A

retentive undercut

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15
Q

_____ _____ lies between survey line and gingival margin

A

Undercut area

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16
Q

Line encircling a tooth that designates its greatest diameter at a selected position determined by a dental surveyor

A

HEIGHT OF CONTOUR/

SURVEY LINE

17
Q

Portion of tooth above the height of contour

A

Suprabulge Area

18
Q
  • Portion of tooth below the height of contour in relation to path of insertion
  • Retentive Undercut within this area
  • Only Retentive clasp tips contact tooth below the Survey line
A

Infrabulge Area

19
Q

A facial
undercut preferred: What are areas of retentive undercut:

Mesiofacial (A),
Mid-facial (B), Distofacial (C)

A

Mesiofacial (A),
Mid-facial (B), Distofacial (C)

Mesiolingual, Distolingual

20
Q

An ideal retentive undercut lies, within_____ 1/3, at least 1mm from gingival margin

A

gingival

21
Q
  • Illusion of undercut due to excessive cast tilt
  • Will not exist clinically
  • Awkward path of insertion
  • Patient unable to place RPD
A

false undercut

22
Q
  • Lingually-inclined mandibular teeth
  • Buccally-inclined maxillary teeth
  • Bony buccal exotoses, tori
  • Height of contour too high, clasp placement too high
  • Tissue undercut area of bar clasp
A

Typical Interference areas:

23
Q

What are two ways that one can eliminate tooth, soft tissue, and exotoses interferences

A
  • Alter tilt of cast/Change path of insertion

* Maintain cast tilt, eliminate by surgery or recontouring of teeth

24
Q

_____ of carbon marker indicates survey line of abutment teeth
at chosen path of insertion

A

Side

25
Q 
All components (rigid) of RPD, except terminal
1/3 of retentive clasp,\_\_\_\_\_  survey line
A

above

26
Q

Where is the ideal location of the survey line?

A

Ideally, survey line located at junction of middle

& gingival 1/3

27
Q

Proximal 2/3 of retentive clasp & Reciprocal

clasp in middle 1/3,____ ` survey line.

A

above

28
Q

Retentive terminal 1/3 in_____ 1/3.

A

gingival

29
Q

If the survey line is too near the occlusal surface what can occur?

A
  • May interfere with occlusion
  • Increased leverage on tooth
  • Tooth recontoured to lower survey line.
30
Q

If survey line, at chosen path of insertion, too low = ?

A

no undercut

exists

31
Q

Amount of undercut
varies depending on clasp type:

_____” for Cr-Co or Ni-Cr cast clasp

A

0.01”

32
Q

Amount of undercut
varies depending on clasp type:

___” or____” for wrought wire clasp

A

0.02” or 0.03”

33
Q

T/f: to correct an Inadequate Retentive Undercut one can:
– Enamoplasty to create undercut
•“Dimple”

–Addition of composite
at site to create undercut

–Surveyed crown

A

true

34
Q

–Adjust height of vertical arm: marker touches 3 widely separate tissue surface areas
• In one plane
–Circle each tripod mark

A

Method One of Tripod Cast

35
Q

• Draw vertical lines parallel to analyzing rod on 3 sides of cast
(Lines widely separated)

A

Method Two of Tripod Cast

36
Q

Which method of tripoding is most often used?

A

Method two

37
Q

Color code:

  • Metal framework outline
  • Wrought wire clasp
A

Blue

38
Q

Color Code:

  • Indicate retentive undercut
  • Indicate tooth modification areas
  • Guiding planes, Survey line reposition, Rest seat areas
A

Red

39
Q

Color Code:

-Survey line, tripod marks and soft tissue undercuts

A

Black

Removable Partial Dentures (20 decks)

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