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Complete Removable Prosthodontics > Denture Base Resin, Processing, Lab Remount > Flashcards

Denture Base Resin, Processing, Lab Remount Flashcards

1
Q

resin

A

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

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2
Q

acrylic

A

designating a colorless, pungent acid

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3
Q

denture base polymers (6)

A 
vulcanite 
polystyrene 
vinyls 
nylons
PMMA
urethane dumethacrylate (light activated)
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4
Q

PMMA resin (8)

A 
excellent esthetic properties 
adequate strength
low water sorption
low solubility
non-toxic, low allergenicity 
easily repaired 
reproduces detail accurately 
simple molding and processing technique
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5
Q

other resins may outscore PMM in some one property, but

A

no existing resin scores so high in the aggregate

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6
Q

PMMA resin ingredients (5)

A 
liquid monomer: methyl methacrylate 
powdered polymer: polymathy methacrylate 
plasticizer: dibutyl phthalate 
initiator: benzoyl peroxide 
pigments
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7
Q

PMMA resin as a two component system

A

liquid monomer

powdered polymer

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8
Q

PMMA liquid (3)

A

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

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9
Q

PMMA powder (4)

A

PMMA beads
pigments
plasticizer (dibutyl phlkalate)
benzoyl peroxide- initiator of polymerization

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10
Q

types of cure (3)

A

heat

chemical light

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11
Q

heat activated denture base (3)

A

used in fabrication of all denture base

thermal energy required for polymerization- water bath or microwave oven

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12
Q

heat activated denture base components (4)

A

powder- prepolymerized spheres of PMMA and small amount of benzoyl peroxide (initiator)
liquid- predominantly non polymerized methyl methacrylate with small amount of hydroquinone (inhibitor)
cross linking agent is added to liquid

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13
Q

Compression Molding

A

A technique to process denture

resins

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14
Q

injection molding technique

A
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15
Q

porosity (3)

A

internal porosity- but none on surface- likely cause is temperature rise avocet 100C inside flask
monomer builds at 100.8C
spherical bubbles inside resin

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16
Q

internal porosity: monomer boils (2)

A

heat at surface of resin is conducted away into investing medium, hence no porosity yon surface resin
this vaporization of the monomer affects the thick areas of denture base

17
Q

other porosity (4)

A

irregular shape, located throughout the base:

  • inadequate pressure
  • not enough resin in mold
  • improperly mixed resin
18
Q

resin denture teeth (2)

A

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

are highly cross linked resin, teeth and base chemically bond to each other

19
Q

chemically activated denture base resin (3)

A
  • induce the denture base polymerization
  • does not require thermal energy, made in room temp
  • chemically activated resins also referred-cold curing, self curing or qutopolymerizing resins
20
Q

chemically activated denture base resin composition (3)

A

liquid (monomer)- addition of tertiary amine like dimethyl-para-toludine

  • tertiary amines causes decomposition of benzoyl peroxide
  • mold preparation and resin packing is same as heat activated resin
21
Q

auto polymerized resins

A

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

22
Q

heat-activated vs autopolymerized (3)

A
  • fundamental difference is the method of activation of the inhibitor benzoyl peroxide
  • a greater degree of polymerization with heat activated
  • better color stability with heat activated
23
Q

color stability of auto polymerized

A

the tertiary amine activator (dimethyl-p-toluidine) in the liquid oxidizes and turns orange after a few months

24
Q

light activated denture base resins (8)

A
  • composite matrix of urethane dimethacrylate, microfine silica, and high molecular weight acrylic resin monomer
  • activator: visible light
  • initiator: camphorquinone
  • supplied in sheet and rope form packed in light proof pouches
  • light activated resin cannot be flashed in conventional manner
  • opaque investing media provides the passage of light
  • teeth is arranged and the denture base sculpted using light activated resin
  • denture base is placed into a light chamber and polymerized

Complete Removable Prosthodontics (20 decks)

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