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Removable Partial Dentures > Mouth Preparation Master Cast > Flashcards

Mouth Preparation Master Cast Flashcards

1
Q

what is in phase 1

A
  • relief of pain and infection
  • collection of diagnostic data
  • develop tx plan
  • patient education and motivation
  • occlusal equilibration
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2
Q

what is included in collection of diagnostic data

A
  • diagnostic cast
  • diagnostic mounting
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3
Q

what is in phase 2

A
  • removal of deep caries and temporary restorations
  • extraction of non retainable teeth
  • preporosthetic surgery: tuberosity reduction, etc
  • periodontal treatment, plaque control
  • interim prosthesis: function and esthetics
  • occlusal equilibration- might need changes after extractions
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4
Q

what is in phase 3

A
  • definitive endo treatment
  • definitive restorative treatment: survey crown, FPD
  • occlusal plane correction
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5
Q

what is in phase 4

A

construction RPD

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6
Q

what is in phase 5

A
  • post insertion care
  • periodic recall
  • continued plaque control
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7
Q

what is included in mouth preparation

A
  • relief of pain and infection
  • remove caries
  • extractions, preprosthetic sx
  • perio tx, plaque control
  • occlusal equilibration
  • endo
  • definitive restorative tx
  • occlusal plane correction
  • enameloplasty for RPD
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8
Q

what should you do on diagnostic casts

A

-preliminary design of RPD
- identify tooth modification areas

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9
Q

what are the 3 steps to enameloplasty for RPD

A
  • develop guide planes
  • enlarge embrasures for minor connectors
  • lower height of contour
  • create undercuts if needed
  • prepare rest seats
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10
Q

where should the proximal, ML, and lingual guide planes be

A
  • proximal: adjacent to edentulous areas
  • ML: stress- release clasps ML minor connector
  • lingual: reciprocal clasp
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11
Q

where should the rest seats be located

A

occlusal and lingual

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12
Q

what is the sequence that preparations should be done to ensure that they are parallel to path of insertion

A
  • prepare guiding planes
  • enlarge embrasures for minor connectors
  • reposition the survey line to reduce interferences to framework placement and enable most ideal clasp placment
  • confirm survey line lowered enough
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13
Q

when are undercut preps done

A

when slightly insufficient retentive undercut

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14
Q

what undercut prep is contraindicated

A
  • sloped buccal and or lingual surface
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15
Q

when are undercut preps indicated

A

slightly insufficient retentive undercut with vertical buccla and lingual surfaces

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16
Q

what do you use to prepare undercuts

A

round end tapered diamond

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17
Q

when are rest seat preps done

A

after adequate prep for GP, survey line alterations

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18
Q

how do you check for adequecy of occlusal/ embrasure rest seats

A
  • patient close into beading wax
  • measure thickness of wax - must be at least 1 mm
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19
Q

what do you do if you are unable to attain adequate depth within enamel

A

remove small amount of opposing tooth structure and remake impression of opposing arch

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20
Q

what are the Class III RPD impression techniques for master cast

A
  • residual ridge not provide RPD support
  • alginate/stock tray
  • alginate/ custom tray
  • custom tray/elastomeric material
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21
Q

what impression technique is preferred at UMKC

A
  • custom tray/elastomeric materia
  • not border molded
  • medium bodied PVS
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22
Q

what is an important source of RPD support

A

residual ridge

23
Q

what is the broad stress distribution concept

A
  • distribute occlusal forces over as many teeth and soft tissue as possible
  • dont overload teeth or tissue
  • increased stability and retention
  • less frequent reline
24
Q

what is the problem with tooth- tissue supported RPDs

A

-the periodontal membrane allows for 0.25 plus or minus 0.1 mm and the muco periosteum allows for 2.0 plus mm movement

25
Q

due to the lever effect of the distal extension base on tooth- tissue supported RPDs________

A

occlusal pressure is concentration on the distal end of the base

26
Q

what is the solution for tooth/tissue supported RPDs

A
  • equalize support derived from tissue and teeth
  • to distribute load to both the natural and artificial dentition and minimize base movement
27
Q

what is the one step impression

A

custom tray/elastomeric material

28
Q

what is the corrected (altered) cast technique

A
  • two step (dual) impression
  • step one: impression of teeth and residual ridge
  • step two: impression of residual ridge areas using framework
29
Q

describe step one of the two step impression technique

A
  • alginate/stock tray or alginate/custom tray
  • frameowrk fabricated on 1st case
30
Q

framework is ____ precise in aliginate technique than elastomeric impression

A

less

31
Q

describe the step two of two step impression

A

-sectional trays added to framework
- border molded
- elastomeric material

32
Q

why is the altered/corrected cast prone to operator error

A
  • lift of distal framework during residual ridge impression
  • framework on final case not oriented the same as in the mouth
33
Q

is there a difference in vertical displacment of final RPD between two technqies

A

no

34
Q

describe the one step impression with custom tray

A
  • fabricate tray on working/ diagnostic cast
  • apply separating medium to cast: liquid foil not vaseline
  • tray extensions: 2-3mm coronal to vestibule depth in both dentate and edentulous areas
  • wax spacer placed over tray outline
  • tray stops
35
Q

where is the wax spacer placed in one step

A
  • ~3mm over teeth - red rope wax
  • ~1.5 mm over residual ridge -baseplate wax
36
Q

where are the tray stops

A

3 widely spaced openings in wax spacer - 3mm openings
- tripod support for tray

37
Q

what teeth should you not use with tray stops

A

teeth contacting rests

38
Q

the residual ridge stops in RPD are similar to ______

A

complete denture tray

39
Q

how do you make the custom tray in one step impression

A
  • aluminum foil over wax spacer
  • triad tray material adapted over foil/spacer
  • polymerize
  • add finger rests to tray surface over edentulous areas
  • add handle
40
Q

why do you add finger rests to tray surface over edentulous areas

A

-stability during impression
- strengthen tray

41
Q

what tray area is prone to fracture

A

distal areas

42
Q

when do you determine final tray extension

A

at impression appointment

43
Q

where are PIP tray flanges located

A

extension and outer surface

44
Q

what should you do at final tray extension appointment

A
  • border molding movements
  • areas where PIP removed, shorten or thin tray
  • border mold distal extension residual ridge areas
45
Q

describe elastomeric impression material

A
  • polysulfide: high tear strength, pour within 1 hour
  • PVS: hydrophobic, adequate tissue detail
46
Q

how do you make the master cast

A
  • box impression
  • pour with improved dental stone
47
Q

what do you do to survey the master cast

A
  • determine path of insertion
  • mark abutment height of contour
  • measure and mark retentive undercut
48
Q

how do you determine path of insertion

A
  • guide planes parallel
  • equalize undercut
49
Q

where do you mark the abutment height of contour

A

facial and lingual

50
Q

how do you measure and mark retentive undercut

A
  • red line not dot
  • approximate inferior edge of clasp
51
Q

what do you do on the master cast

A
  • survey
  • tripod lateral sides of cast
52
Q

what is involved in the lab prescription

A
  • surveyed cast
  • work authorization
  • send to QA for approval
  • send to lab
  • framework fabricated
53
Q
A

Removable Partial Dentures (21 decks)

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