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Removable Partial Dentures > Principles of Surveying > Flashcards

Principles of Surveying Flashcards

1
Q

what is the name of the surveyor we use at UMKC

A

Ney Jelenko

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2
Q

what are the dental surveyor tools

A

-analyzing rod
- carbon marker
- carbon sheath
- undercut gauges (0.010, 0.020, and 0.030.)
- wax trimmer/knife

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3
Q

what are the functions of the dental surveyor

A
  • survey diagnostic cast
  • contour wax patterns
  • contour ceramic and cast restorations
    -place attachments requiring parallelism
  • survey master cast
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4
Q

what is the objective of surveying diagnostic cast

A
  • determine the most acceptable path of insertion
  • identify proximal tooth surfaces that can function as guiding planes
  • locate and measure areas of teeth that may be used for retention
  • determine if soft or bony areas of interference exist
  • determine most suitable path of insertion to satisfy esthetics
  • delineate height of contour on abutment teeth
  • record cast position to selected path of insertion
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5
Q

what is the survey procedure for diagnostic cast

A
  • path of insertion determined
  • mark the height of contour/survey line
  • measure/mark retentive undercut
  • tripod cast
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6
Q

what is the path of insertion determined based on

A

guiding planes
- retentive undercut
- interferences
- esthetics

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7
Q

what is the path of insertion

A

the direction in which the RPD is inserted and removed from the abutment teeth

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8
Q

what are guiding planes

A

parallel, flattened surfaces at proximal or axial surfaces of teeth
- contact minor connectors, guiding plates
- greater number of GPs- path of insertion more specific
- increase RPD stability and retention

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9
Q

what is the guiding planes identified by

A

tilting cast in anterior- posterior direction until maximum parallelism of proximal surfaces
- anterior posterior tilt as viewed from rear of cast table

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10
Q

what is the 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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11
Q

the final orientation of the guiding plane is seldom ______ from horizontal

A

greater than 10-15 degrees

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12
Q

what is a retentive undercut

A

RPD mechanical retention provided by clasp that engages retentive undercut

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13
Q

what is the purpose of a retentive undercut

A

resists RPD dislodging forces

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14
Q

where is the undercut area located

A

between survey line and gingival margin

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15
Q

what is the height of contour/ survey line

A

line encircling a tooth that designates its greatest diameter at a selected position determined by a dental surveryor

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16
Q

height of contour will change if _____ is changed

A

axial inclination

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17
Q

what is a suprabulge area

A

portion of tooth above the height of contour

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18
Q

what is the infrabulge area

A

portion of tooth below the height of contour in relation to the path of insertion

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19
Q

is the retentive undercut in the infrabulge area or suprabulge area

A

infrabulge area

20
Q

what is the only thing that contacts the tooth below the survey line

A

retentive clasp tips

21
Q

what are the areas of retentive undercut

A

mesiofacial, midfacial, distofacial
- mesiolingual and distolingual

22
Q

where is the ideal retentive undercut located

A

within gingival 1/3 at least 1 mm from gingival margin

23
Q

what should you manipulate to distribute undercut to abutments

A

mediolateral tilt of cast

24
Q

what is a false undercut

A
  • illusion of undercut due to excessive cast tilt
  • will not exist clinically
  • awkward path of insertion
25
Q

what are the typical interference areas

A
  • lingually inclined mandibular teeth
  • buccally inclined maxillary teeth
  • bony buccal exostoses and tori
  • height of contour too high, clasp placement too high
  • tissue undercut area of bar clasp
26
Q

how do you eliminate interferences

A
  • alter tilt of cast/ change path of insertion
  • maintain cast tilt, eliminate by surgery or recontouring of teeth
27
Q

how do you improve esthetics

A

-alter mediolateral cast tilt
- if inadequate space for natural tooth width, recontour proximal surfaces to restore lost dimension

28
Q

how do you mark the height of contour/survey line

A

side of carbon marker indicates survey line of abutment teeth at chosen path of insertion
- tip of marker will produce incorrect survey line

29
Q

what parts of the RPD are located above the survey line

A

all components except terminal 1/3 of clasp

30
Q

where is the ideal survey line located

A

at the junction of middle and gingival 1/3

31
Q

where is the retentive terminal 1/3 of clasp located

A

in gingival 1/3

32
Q

where is proximal 2/3 of retentive clasp and reciprocal clasp located

A

in middle 1/3 above the survey line

33
Q

what happens if the survey line is too hgih

A
  • may interfere with occlusion
  • increased leverage on tooth
34
Q

what should you do if the survey line is too high

A

recontour the tooth to lower survey line

35
Q

what happens if the survey line is too low

A
  • no undercuts exist for clasp retention
  • at or near gingival margin
36
Q

what should you do if the survey line is too low

A
  • cannot use enamoplasty
  • requires surveyed crown
37
Q

how are undercuts measured

A

undercut gauge at chosen path of insertion

38
Q

what does the amount of undercut vary depending on

A

clasp type

39
Q

what is the undercut for Cr-Co or Ni-Cr cast clasp

A

0.01”

40
Q

what is the undercut for wrought wire clasp

A

0.02” or 0.03”

41
Q

what do you do if there is an inadequate retentive undercut

A
  • enameloplasty to create undercut
  • addition of composite at site to create undercut
  • surveyed crown
42
Q

what does the tripod cast do

A

record tilt of cast at chosen path of insertion

43
Q

what are the 2 methods of tripod cast and what do we use at UMKC

A
  1. adjust height of vertical arm: marker touches 3 widely separate tissue surface areas. circle each tripod mark
  2. draw vertical lines parallel to analyzing rod on 3 sides of the cast - UMKC method
44
Q

what is the color code for RPD design at UMKC

A
  • blue: metal framework outline, wrought iron clasp
  • red: indicate retentive undercut, indicate tooth modification areas, guiding planes, survey line reposition, rest seat areas
  • black: survey line, tripod marks and soft tissue undercuts
45
Q

what is the order of RPD survey and design overview and what are the steps in each

A

-survey diagnostic cast: path of insertion, mark survey line, mark retentive undercut, tripod cast
- RPD design/ tooth modifications: draw on diagnostic cast
- mouth preparation: tooth modifications
- master cast: resurvey: guiding planes, survey line, retentive undercut, tripod. framework made

46
Q
A

Removable Partial Dentures (21 decks)

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