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RPD > Mouth Preparation and Master Casts > Flashcards

Mouth Preparation and Master Casts Flashcards

1
Q

What is phase I of patient treatment?

A

– Relief of pain & infection
– Collection of diagnostic data (Diagnostic cast, Diagnostic mounting)
– Develop treatment plan/Design RPD
– Patient education & motivation
– Occlusal equilibration

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2
Q

What is phase II of patient treatment?

A

– Removal of deep caries, temporary restorations
– Extraction of non-retainable teeth
– Preprosthetic surgery: tuberosity reduction, etc.
– Periodontal treatment, Plaque control
– Interim prosthesis: function, esthetics
– Occlusal equilibration, may need changes after extractions

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3
Q

What is phase III of patient treatment?

A

– Definitive endodontic treatment
– Definitive restorative treatment
* Surveyed crowns, if needed
* Fixed partial dentures, if appropriate
– Occlusal plane correction

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4
Q

What is phase IV of patient treatment?

A

– Construction RPD

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5
Q

What is phase V of patient treatment?

A

– Post-insertion care
– Periodic recall
– Continued plaque control

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6
Q

What is involved in mouth preparation?

A
  • Relief of pain & infection
  • Caries removal
  • Extractions, Preposthetic surgery
  • Periodontal treatment, plaque control
  • Occlusal equilibration
  • Endodontics
  • Definitive Restorative Treatment
  • Occlusal plane correction
  • Enameloplasty for RPD
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7
Q

What do you draw on the diagnostic cast?

A
  • preliminary design of RPD
  • identify tooth modification areas
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8
Q

How do you decide what tooth modifications need to be made?

A

– according to RPD diagnostic cast design
– QA Worksheet

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9
Q

What are the steps for an enamoplasty for RPD?

A
  1. Develop Guide Planes
  2. Enlarge embrasure for minor connectors
  3. Lower Height of Contour
  4. Create undercuts if needed
  5. Prepare rest seats
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10
Q

Where are guide planes that you develop on the proximal side of teeth?

A

adjacent to edentulous areas

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11
Q

What are guide planes for on the ML side of teeth?

A

stress-release clasps ML minor connector

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12
Q

What is the guide planes for on the lingual side of teeth?

A

reciprocal clasp

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13
Q

What should the height of contour be lowered for on the tooth?

A

– Proximal 2/3 Circumferential retentive clasp
– Reciprocal clasp
– Lingual Guide Plate

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14
Q

What is the sequence to confirm that preps are parallel to path of insertion?

A
  1. Prepare guiding planes
  2. Enlarge embrasures for minor connectors
  3. Reposition the survey line to reduce interferences to framework placement and enable most ideal clasp placement
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15
Q

When doing an undercut preparation what is contraindicated?

A

Sloped buccal &/or lingual surface

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16
Q

When doing an undercut preparation what is indicated?

A

slightly insufficient retentive undercut with vertical buccal & lingual surfaces

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17
Q

When would you do an undercut preparation?

A

Used when slightly insufficient retentive undercut

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18
Q

How do you check adequacy of the occlusal/embrasure rest seats?

A

– Patient close into beading wax
– Measure thickness of wax (Caliper)
* At least 1mm

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19
Q

What should you do if you are unable to attain adequate depth within enamel for the rest seat?

A

Remove small amount of opposing tooth structure
– Be sure to remake impression of opposing arch

20
Q

When do you do a rest seat preparation?

A

After adequate preparation for GP, Survey line alterations

21
Q

What is the preferred technique for class III RPD impression technique?

A

Custom tray/elastomeric material
- not border molded
- medium-bodied PVS

22
Q

What are the different options for a class III RPD impression technique?

A
  • Alginate/stock tray
  • Alginate/custom tray
  • Custom tray/elastomeric material
23
Q

What is an important source of RPD support?

A

residual ridge

24
Q

What is the broad-stress distribution concept?

A
  • Distribute occlusal forces over as many teeth & as much soft tissue as possible
  • Not overload teeth or tissue
  • Increased stability & retention
  • Less frequent reline
25
Q

What is the main problem with tooth-tissue supported RPDs?

A

Due to the lever effect of the distal extension base, occlusal pressure is concentrated on the distal end of the base

26
Q

The periodontal membrane allows for ______ mm movement with a tooth-tissue supported RPD

A

0.25 +/- 0.1

27
Q

The muco-periosteum allows for ____ mm movement with a tooth-tissue supported RPD

A

2.0 +

28
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 & minimize base movement
29
Q

What are the different techniques for extension RPD impression?

A
  • Custom tray/elastomeric material
  • Corrected (Altered) Cast technique
30
Q

What is the corrected (Altered) Cast technique for extension RPD impression?

A

– Two-step (Dual) impression
* Step one: Impression of teeth & residual ridge
* Step two: Impression of residual ridge areas using framework

31
Q

What is the Custom tray/elastomeric material technique for extenstion of RPD impression?

A

– Border-molded tray
– One-step impression

32
Q

What does Step one: Impression of teeth & residual ridge for an altered cast impression entail?

A

– Alginate/stock tray or Alginate/custom tray
– Framework fabricated on 1st cast
* Framework less precise than with elastomeric impression

33
Q

What does Step two: Impression of residual ridge areas using framework for an altered cast impression entail?

A

– Sectional trays added to framework
– Border-molded
– Elastomeric material

34
Q

What errors are the altered cast impressions prone to?

A

operator error
*Lift of distal framework during residual ridge impression
*Framework on final cast not oriented the same as in the mouth

35
Q

What are the steps for an altered/corrected cast?

A

*Residual ridge removed
from 1st cast
*Retentive dovetails created
*Framework/impression luted to altered cast
*Cast & impression boxed
*Residual ridge areas poured with yellow stone
*Final cast

36
Q

Is there a significant difference between the custom tray/elastomeric material and the corrected (Altered) Cast technique?

A

No

37
Q

Which technique is more prone to operator error: custom tray/elastomeric material or corrected (Altered) Cast technique?

A

altered cast procedure

38
Q

What are the steps for a one-step impression: custom tray?

A
  • Fabricate tray on working/diagnostic cast
  • Apply separating medium to cast
  • Tray extensions
  • Wax spacer placed over tray outline
  • Tray stops
  • Aluminum foil over wax spacer
  • Triad tray material adapted over foil/spacer
  • Polymerize
  • Add finger rests to tray surface over edentulous areas
  • Add handle
  • Determine final tray extension at
    impression appointment
  • Border mold distal extension residual ridge areas
39
Q

_____ mm coronal to vestibule depth in both dentate & edentulous areas for a custom impression tray

A

2-3

40
Q

The wax spacer for a custom impression tray should be ___ mm over teeth and ____ mm over residual ridge

A

~3 mm over teeth
~1.5 mm over residual ridge

41
Q

What are tray stops for a custom impression tray?

A

3 widely spaced openings in wax spacer
* 3 mm openings

42
Q

How do you determine the final tray extension at impression appointment?

A

– PIP tray flanges: extension & outer surface
– Do border molding movements
– Areas where PIP removed, shorten or thin tray

42
Q

What are the different elastomeric impression materials?

A

– Polysulfide: High tear strength, pour within 1 hour
– PVS: Hydrophobic, adequate tissue detail

43
Q

What are the steps to survey a master cast?

A

– Determine path of insertion
Equalize undercut
– Mark abutment height of contour
– Measure & mark retentive
undercut

44
Q

How do you determine the path of insertion when surveying?

A
  • Guide planes parallel, Equalize undercut
45
Q

Where should you mark abutment height of contour?

A
  • Facial & Lingual
46
Q

What do you need to do to a master cast?

A

survey
tripod lateral sides of cast

RPD (16 decks)

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