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RPD - D2 - Spring > Par 2 - Maintenance & Repair > Flashcards

Par 2 - Maintenance & Repair Flashcards

1
Q

What are the solutions to an RPD having the problem of loss of support?

A
  1. lab reline (preferred method)
  2. intraoral reline
  3. rebase
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2
Q

When making a lab reline, you make a ______ impression in base w/ appropriate material while holding rests securely in place & border molding.

A

open mouth

- make sure all rests are in place

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3
Q

What material would you use to reline mobile tissue?

A

Zinc-Oxide Eugenol

  • just know that this is the only one for mobile tissue!
  • all other materials are for firm tissue (VPS, Polysulfide rubber base, Polyether, Tissue conditioner)
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4
Q

What are the problems w/ intraoral reline materials?

A
  1. porosity
  2. color instability
  3. incomplete chemical bond, leakage
  4. viscosity can affect accuracy
  5. patient exposure to high levels of PMM
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5
Q

2 types of intraoral reline materials?

A

Methyl Methacrylates: bonds to acrylic; hardens & shrinks over time (2wks), can layer for better fit

Silicones: requires bonding agent; lasts longer w/ sealant (2yrs); cannot layer

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6
Q

T/F? When doing an intraoral reline, you want overextension.

A

FALSE.

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7
Q

What is the process of rebase?

A

Same process as reline, except the polished surface is removed & re-waxed to contour prior to processing.
- base & teeth are removed & re-waxed

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8
Q

What are the solutions for occlusal wear of the RPD?

A
  1. reprocess (rebase)

2. remake RPD

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9
Q

3 Methods for recreating master cast?

A
  1. alginate impression, pour cast, fit on framework to cast
  2. framework in mouth, make alginate “pick up” impression, framework remains in alginate & is poured up.
  3. dual impression: custom tray fabricated over retention lattice, impress w/ VPS, w/ framework in mouth, make alginate “pick up impression” over framework.
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10
Q

What type of stone do you use to pour up your alginate impression?

A

ONLY pour these up w/ type 3 stone (microstone)

- If you use die stone (type 4), acrylic may break later on in the process

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11
Q

What could cause loss of retention?

A

metal fatigue or clasp fracture results in the loss of retention for RPD
- RPD dislodges in an occlusal direction…

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12
Q

What are common indications for remake?

A
  1. framework distortion
  2. cast clasp fracture
  3. clasp assembly fracture
  4. loss of abutment teeth
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13
Q

T/F? Acrylic RPD is completely tissue supported.

A

TRUE.

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14
Q

What are the 3 restorative categories of acrylic RPDs?

A
  1. interim
  2. transitional
  3. treatment
    - they all look the same, but function differently for the pt.
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15
Q

What is an indication for interim partial denture?

A

a definitive tx following w/i an expected time frame

- think of it as: “in the meantime…”

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16
Q

What is an indication for transitional partial denture?

A

extraction of hopeless teeth performed in stages

17
Q

What is an indication for treatment partial denture?

A

a temporary RPD used during a healing phase; may or may not have teeth
OR post surgical application
- You can do these for pts who need a reline
- Start over with an RPD that is ALL acrylic, then reline with some tissue conditioner until the patient is healthy, then move on to the recommended RPD

18
Q

What clasp would you use for an undercut in the interproximal area?

A

Ball clasp

19
Q

__mm deep bead at the finish line bc it cant go any deeper (it’s not the vibrating line!)

A

.5mm

20
Q

Advantages of flexible base RPDs?

A
  1. highly esthetic
  2. design versatility
  3. flexible
  4. “unbreakable”
  5. minimal/no tooth prep
  6. use w/ metal/MMA allergies
21
Q

Disadvantages of flexible base RPDs?

A
  1. tissue supported
  2. difficult to adjust, repair, reline
  3. teeth are mechanically retained
  4. cost
22
Q

Contraindications for flexible base RPDs?

A
  1. *** Distal Extension
  2. poor soft tissue quality
  3. loss of primary support anatomy (flat ridge)
  4. loss of restorative space
  5. periodontally compromised teeth
23
Q

What is a common problem/caution with using alternative RPD materials (esp. tissue supported partials–like nylon or acrylic)

A

the lack of movement strips the tissue of the LINGUAL side of the teeth, and you create a periodontal problem for the patient —– so resurface this side

24
Q

T/F? Esthetic clasps are highly esthetic, but also are highly flexible. They have an unpredictable design.

A

Both TRUE

RPD - D2 - Spring (5 decks)

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