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RCD 1001 > Impression Materials > Flashcards

Impression Materials Flashcards

1
Q

How materials interact with its enviroment & pateitns, properties, contex of use.

A

Biocompatibility

fundamental requirement for any dental restoration.

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2
Q

The breakdown of mateirals int he oral enviroment

A

Biodegredation

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3
Q

What are somethigns we look for when choosing dental materials?

A
  • Long term testing & trials
  • Internationall reconized spec & standards
  • Maximun saftey, durable, effective
  • Lower risk due to low knowledge
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4
Q

Whos responsibility is it toweigh the quality of evidence regarding manufacturers’ claims from an informed, intelligent perspective to ensure optimum treatment outcomes for the patients.

A

The dentist

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5
Q

Dentists are expected to acquire sufficient knowledge of the what 3 things?

of dental materials used in the rehabilitation of the edentulous patient.

A
  1. Properties
  2. Behavior
  3. Limitations
    Of all mateirals
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6
Q

What is the goal of optimal impressions?

A
  1. Retention
  2. Support
  3. Stability
    of denture!
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7
Q

Impression for complete dentures must what?

A

be capable of capturing and replicating all anatomical peripheral and denture-supporting structures

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8
Q

Just look lol

A

Just look

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9
Q

an imprint produced by ‘the pressure of one thing upon or into the surface of another

A

Impression

Active + making

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9
Q

an impression made for the purpose of diagnosis or for the construction of a custom tray.

A

Preliminary Impression

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10
Q

What mateirals do you need for a preliminary impression?

A
  1. Stock tray
  2. Alginate
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11
Q

An imprint that record the entire functional denture-bearing area to ensure maximum support, retention and stability for the denture during use.

A

Final Impression

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12
Q

What is the purpose of a final impression?

A

To record accurately the tissues of the denture bearing areas, in addition to recording the functional width and depth of the sulci.

Anatomy of mouth!

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13
Q

What are the 3 diffrent impression techniques?

A
  1. Mucostatic
  2. Mucocompressive
  3. Selective Pressure
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14
Q

impression is made with the mucosa in its normal resting position.
* lead to good fitting denture
* During chewing denture will pivot on incompressbale areas and dig into compressible areas

A

Mucostatic impression

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15
Q

**The impression is made when the mucosa is subject to compression. **
* Denture is most stable during function not at rest
* Hard tissue not compressed

A

Mucocompressive impression

What we do

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16
Q

The impression is made with stress bearing areas being compressed and stress relief areas being relieved.

A

Selective pressure impression

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17
Q

What are the 2 main categories of impression materials?

A
  1. Ridgid
  2. Elastics
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18
Q

What kind of impression mateiral?

impression plaster, zinc oxide eugenol paste, and dental impression compound

A

Ridgid/ non-elastic

19
Q

What rigid material is used from boarder molding of custom trays?

A

Compound

20
Q

What are 2 reasons why ridgid impression materials are bad?

A
  1. Inability to withdraw from undercuts= fracture easily
  2. No elastic defromation, does not recover past set
    3.
20
Q

What impression mateiral?

used as a mucostatic impression material for making final impressions for edentulous patients
* does not compress or displace tissues
* not used often

A

Impression plaster

21
Q

What impression mateiral?

  • Rigid
  • May fracture in the presence of undercuts.
  • Set material does not adhere to set plaster or stone.
  • Power, liquid, or paste
  • < 0.1% setting shrinkage= impression stored for long time with **no distortion **
A

Zinc Oxide Eugenol (ZOE) Impression Paste

maining used fro final impression of endentulous ridge

22
Q

What impression mateiral can be used as a surgical dressing and why?

A

Zine Oxide Eugenol paste because it is soothing + anti-inflammatory

23
Q

What are 4 adavantages of ZOE

A
  1. Dimensional stability
  2. Good surface detail
  3. Can be added on to exsisting ZOE
  4. Mucostatic or mucocompressive
24
Q

What are 4 Disadvantages of ZOE

A
  1. Can be used with deep undercuts
  2. sets quickly if thin
  3. Eugenol allergies
  4. Stining + burning
25
Q

What impression material?

  • Rigid
  • Modeling plastic
  • Thermoplastic; heat to mold
  • cakes or sticks, with the colors representing different fusing temperatures.
A

Dental Impression Compounds

green sticks for us

26
Q

Dental compound is a mixture of waxes and thermoplastic resins plus fillers that increase ____ above mouth temperatures and provide ____ at room temperature.

A

Above mouth temp= viscosity (heat at 124F by flame or water bath
At room temp= rigidity

27
Q

WHat type of dental impression compound do we use in lab?

A

Type 1 lower fusing material for boarder molding

can also be used for pre-liminary impressions

28
Q

What two was can impression compound be heated?

A
  1. Direct flame for sticks
  2. Waterbath
29
Q

Whar are the two categories of elastic material?

A
  1. Synthetic elastomer
  2. Hydrocolloids
30
Q

What material?

considered one of the most accurate impression materials for recording fine details because of their low viscosity and great degree of recovery after deformation around undercuts.

A

Reversible Hydrocolloids; Agar

31
Q

What impression material

Most widely used impression materials in dentistry: ease of manipulation, no need for expensive equipment, relatively low cost, and comfort to patients.

A

Irreverisble Hydrocolloids; Alginate

32
Q

the setting of a reversible hydrocolloid.

Is a solidification process that involves phase changes from sol to gel states, induced by a change in temperature.

A

Gelation of Agar

reversible

33
Q
  • Long working time (5 min set)
  • can be poured immediatley
  • limited use in making fix prosth
A

Agar; reversible hydrocolloids

34
Q

Whay is the most commonly used category of impression materials today?

A

Synthetic Elastomers

35
Q

What were the were the first synthetic elastomeric material to be introduced in 1950.

A

Polysulfides

drawback is distorition over time

36
Q

Silicones and polyethers form the majority of what impression mateira used today?

A

Elastomeric impression mateirals

37
Q

What are 3 steps to making impression with elastomeric materias?

A
  1. custom trays 2-3 mm short of sulcus
  2. boarder molded green compoound
  3. verify proper seal
38
Q

What impression material?

two-paste system that is available in low, medium, and high consistencies and is made up of a base and accelerator/reactor.

A

Polusulfide rubber

39
Q

What occurs when the pasted of polysulfied rubber are mixed together?

A

Polymerization rxn occurs

40
Q

How do you know polysulfied rubber is set and why? How soon to pour?

A

paste has tunred to dark brown rubber, due to prescence of lead oxide; pour within 1 hour
stinks

41
Q

Characteristics of polysulfied rubber

A
  • great detail
  • long working time
  • good flexibility
  • high tear strength
  • hydropphobic so dry tissues prior
  • mess, smells bad.
42
Q

Polysulfied rubber to record the soft tissues for edentulous patients under ____ _____

A

minimum compression

43
Q

What impression mateiral

  • Highly accurate
  • High dimensional stability
  • Multiple casts
  • Easy to mix
  • Pleasant odor

disadvantage:
1. Expensive
2. sulfur inhibit set; no latex gloves
3. short working time

A

Polyvinylsiloxanes (PVS/VPS)

RCD 1001 (9 decks)

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