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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
what are the typical interference areas
- 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
how do you eliminate interferences
- alter tilt of cast/ change path of insertion - maintain cast tilt, eliminate by surgery or recontouring of teeth
27
how do you improve esthetics
-alter mediolateral cast tilt - if inadequate space for natural tooth width, recontour proximal surfaces to restore lost dimension
28
how do you mark the height of contour/survey line
side of carbon marker indicates survey line of abutment teeth at chosen path of insertion - tip of marker will produce incorrect survey line
29
what parts of the RPD are located above the survey line
all components except terminal 1/3 of clasp
30
where is the ideal survey line located
at the junction of middle and gingival 1/3
31
where is the retentive terminal 1/3 of clasp located
in gingival 1/3
32
where is proximal 2/3 of retentive clasp and reciprocal clasp located
in middle 1/3 above the survey line
33
what happens if the survey line is too hgih
- may interfere with occlusion - increased leverage on tooth
34
what should you do if the survey line is too high
recontour the tooth to lower survey line
35
what happens if the survey line is too low
- no undercuts exist for clasp retention - at or near gingival margin
36
what should you do if the survey line is too low
- cannot use enamoplasty - requires surveyed crown
37
how are undercuts measured
undercut gauge at chosen path of insertion
38
what does the amount of undercut vary depending on
clasp type
39
what is the undercut for Cr-Co or Ni-Cr cast clasp
0.01"
40
what is the undercut for wrought wire clasp
0.02" or 0.03"
41
what do you do if there is an inadequate retentive undercut
- enameloplasty to create undercut - addition of composite at site to create undercut - surveyed crown
42
what does the tripod cast do
record tilt of cast at chosen path of insertion
43
what are the 2 methods of tripod cast and what do we use at UMKC
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
what is the color code for RPD design at UMKC
- 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
what is the order of RPD survey and design overview and what are the steps in each
-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

Removable Partial Dentures (21 decks)

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