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dentures final > denture base resins > Flashcards

denture base resins Flashcards

1
Q

broad term used to describe natural or synthetic substances that form plastic materials after polymerization

A

resin

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2
Q

designating a colorless, pungent acid

A

acrylic

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3
Q

colorless, transparent solid

A

pure PMMA

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4
Q

denture base fabricated with POLY (methylmethacrylate) resins

A

acrylic resins

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5
Q

PMMA resins:
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8

A

1excellent esthetic properties
2adequate strength
3low water sorption
4low solubility
5non-toxic, low allergenicity
6easily repaired
7reproduces detail accurately
8simple molding and processing technique

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6
Q

PMMA resin ingredients:

A

liquid monomer
powdered polymer
plasticizer
initiator
pigments

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7
Q

PMMA

liquid monomer:
powdered polymer:
plasticizer:
initiator:
pigments

A

liquid monomer: methyl methacrylate
powdered polymer: polymethyl methacrylate
plasticizer: dibutyl phthalate
initiator: benzoyl peroxide

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8
Q

PMMA resin is a two-component system:

A

liquid monomer and powdered polymer

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9
Q

PMMA liquid:
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2
3

A

methyl methacrylate, glycol dimethacrylate- a cross-linking agent
hydroquinone- inhibitor for increased shelf life

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10
Q

PMMA powder:
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4

A
  1. PMMA beads
  2. pigments
  3. plasticizer (dibutyl phthalate)
  4. benzoyl peroxide - initiator of polymerization
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11
Q

used in fabrication of all denture bases

A

heat-activated denture base

thermal energy required for polymerization

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12
Q

heat at surface of resin is conducted away into investing medium, hence no porosity on surface of resin

A

internal porosity: monomer boils

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13
Q

this vaporization of the monomer affects the thick areas of denture base

A

internal porosity

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14
Q

other porosity.
irregular shape, located throughout the base:

A

inadequate pressure, not enough resin in mold, improperly mixed resin

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15
Q

basically the same composition as the denture base resin, except for pigmentation to produce tooth shades

A

resin denture teeth

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16
Q

are highly cross-linked resins. TEETH and base chemically bond to each other

A

resin denture teeth

17
Q

an amine in the liquid reacts with the benzoyl peroxide in the powder to promote polymerization at room temperature

A

autopolymerized resins

18
Q

what is the difference between heat-activated and autopolymerized

A

method of activation of the initiator benzoyl peroxide

19
Q

a greater degree of polymerization with

A

heat activated resin

20
Q

better color stability with

A

heat activated resin

21
Q

_______ in the liquid oxidizes and turns orange after a few mouths with the color stability of autopolymerized

A

teritary amine activator

22
Q
A

dentures final (9 decks)

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