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RPD > PRINCIPLES OF SURVEYING > Flashcards

PRINCIPLES OF SURVEYING Flashcards

1
Q

DENTAL SURVEYOR

A

• Paralleling Instrument
used in RPD fabrication

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2
Q

Most common brands (2)

A

• Ney, Jelenko

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3
Q

DENTAL SURVEYOR
COMPONENTS
(7)

A

• Cast Holder (A)
• Surveying Stand (B)
• Vertical
Support Post (C)
• Horizontal Arm (D)
• Analyzing Arm (E)
• Mandrel
for Surveying Tools (F)

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4
Q

• Cast Holder (A)
(2)

A

• Surveying Table
• Allows tilt of cast

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5
Q

skipped
DENTAL SURVEYOR FUNCTIONS
(5)

A

• Survey diagnostic cast
• Contour wax patterns
• Contour ceramic & cast restorations
• Place attachments requiring parallelism
• Survey master cast

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6
Q

skipped
OBJECTIVE OF SURVEYING
DIAGNOSTIC CAST
(7)

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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7
Q

DIAGNOSTIC CAST:
SURVEY PROCEDURE
(4)

A
  1. Path of Insertion Determined
  2. Mark the Height of Contour/Survey Line
  3. Measure/Mark Retentive Undercut
  4. Tripod Cast
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8
Q
  1. Path of Insertion Determined
    • Based on (4)
A

Guiding Planes, Retentive Undercut, Interferences,
Esthetics

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9
Q

PATH OF INSERTION

A

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

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10
Q

Exaggerated — to path of insertion avoided

A

tilt
• Patient unable to open mouth sufficiently to
accommodate

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11
Q

PATH OF INSERTION
FOUR FACTORS

A

•Guiding Planes
•Retentive Undercuts
•Interferences
•Esthetics

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12
Q

GUIDING PLANES

A

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

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13
Q

GUIDING PLANES
contact

A

minor connectors, guiding plates

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14
Q

GUIDING PLANES

Greater number of GPs
• Path of insertion more

A

specific

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15
Q

GUIDING PLANES
• Increase RPD (2)

A

stability & retention

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16
Q

GUIDING PLANES
• Identified by tilting cast in

A

anterior-posterior direction until
maximum parallelism of proximal surfaces

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17
Q

• Anterior-posterior tilt: as viewed from — of cast table

A

rear

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18
Q

GUIDING PLANES
• Analyzing rod used to identify

A

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

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19
Q

• Final orientation seldom — from horizontal

A

> 10-15°

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20
Q

RETENTIVE UNDERCUT
• RPD mechanical retention provided by

A

clasp that engages
retentive undercut
• Resist RPD dislodging forces

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21
Q

• Undercut area lies between

A

survey line and gingival margin

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22
Q

HEIGHT OF CONTOUR/
SURVEY LINE
• Line encircling a tooth that designates its

A

greatest
diameter at a selected position determined by a dental
surveyor

23
Q

• Height of contour will change if

A

the axial inclination is changed

24
Q

Suprabulge Area

A

• Portion of tooth above
the height of contour

25
Q

Infrabulge Area
(3)

A

• 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

26
Q

skipped
Areas of retentive undercut:

A

• Mesiofacial (A), Mid-facial (B), Distofacial (C) (Facial
undercut preferred)
• Mesiolingual, Distolingual

27
Q

• Ideally, within gingival 1/3, at least — from
gingival margin

A

1mm

28
Q

RETENTIVE UNDERCUT
• Manipulate mediolateral tilt of cast to equally distribute
retentive undercut to —

A

abutments

29
Q

• Cast tilt should not vary far from

A

horizontal

30
Q

RETENTIVE UNDERCUT
• False Undercut
(4)

A

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

31
Q

INTERFERENCES:
TEETH, SOFT TISSUE,
EXOSTOSES
(5)

A

• Typical interference areas:
• 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

32
Q

INTERFERENCES:
TEETH, SOFT TISSUE,
EXOSTOSES
• Locate & eliminate by
(2)

A

• Alter tilt of cast/Change path of insertion
• Maintain cast tilt, eliminate by surgery or recontouring of teeth

33
Q

ESTHETICS
• Alter mediolateral cast tilt
• Allow

A

natural alignment of anterior tooth

34
Q

• If inadequate space for natural tooth width

A

• Recontour proximal surfaces to restore lost dimension

35
Q

HEIGHT OF CONTOUR/SURVEY
LINE
• Side of carbon marker indicates

A

survey line of abutment teeth
at chosen path of insertion
• Tip of marker will produce incorrect survey line

36
Q

HEIGHT OF CONTOUR/SURVEY
LINE
• All components (rigid) of RPD, except terminal
1/3 of retentive clasp, — survey line

A

above

37
Q

Ideally, survey line located at

A

junction of middle & gingival 1/3

38
Q

• Proximal — of retentive clasp & Reciprocal
clasp in middle —, above survey line.

A

2/3
1/3

39
Q

• Retentive terminal 1/3 in

A

gingival 1/3

40
Q

If survey line, at chosen path of insertion, too near occlusal
surface, clasp too high on the tooth
(3)

A

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

41
Q

If survey line, at chosen path of insertion, too low, no undercut
exists
(4)

A

• Survey line at or near gingival margin
• No undercut exists for clasp retention
• Cannot use enamoplasty to change
• Requires surveyed crown

42
Q

MEASURE/MARK RETENTIVE
UNDERCUT
• Measured with proper

A

undercut gauge at
chosen path of insertion

43
Q

Amount of undercut
varies depending on

A

clasp type
• 0.01” for Cr-Co or Ni-Cr cast clasp
• 0.02” or 0.03” for wrought wire clasp

44
Q

Inadequate Retentive Undercut
(3)

A

– Enamoplasty to create undercut
•“Dimple”
–Addition of composite
at site to create undercut
–Surveyed crown

45
Q

TRIPOD CAST
(2)

A

• Record tilt of cast at chosen path of insertion
• Clinician or Lab technician can re-establish path of insertion

46
Q

skipped
TRIPOD CAST
• Method 1
(3)

A

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

47
Q

TRIPOD CAST
• Method 2 (UMKC method)
(1)

A

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

48
Q

skipped
DIAGNOSTIC CAST: RPD DESIGN
(2)

A
  1. After surveying complete, mechanical & biologic principles
    are applied to design the RPD.
  2. The RPD design is drawn on the diagnostic cast.
49
Q

Blue:
(2)

A
  • Metal framework outline
  • Wrought wire clasp
50
Q

Red:
(3)

A
  • Indicate retentive undercut
  • Indicate tooth modification areas
  • Guiding planes, Survey line reposition, Rest
    seat areas
51
Q

Black:
(1)

A

-Survey line, tripod marks and soft tissue
undercuts

52
Q

MOUTH PREPARATION
(2)

A

• Perform indicated tooth modifications according to RPD
diagnostic cast design
• guiding planes, Survey line reposition, Rests

53
Q

skipped
MASTER CAST
• Impression for master cast after mouth preparation
• Resurvey master cast
(5)

A

• Be sure mouth preparation adequate
• Align guiding planes
• Mark retentive undercuts
• Mark survey line
• Tripod cast

RPD (22 decks)

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