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D1 Spring - Complete Removable Pros > 2 - 3/11: Denture Base Resins > Flashcards

2 - 3/11: Denture Base Resins Flashcards

1
Q

What is resin?

A

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

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2
Q

What is acrylic?

A

A colorless, pungent acid

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3
Q

What are some examples of denture base materials?

A

Gold
Wood
Bone/animal hooves
Ivory
Ceramics
Metals and alloys
Polymers

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4
Q

How was wood chosen for dentures?

A
  • readily available
  • relatively inexpensive
  • can be carved to desired shape
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5
Q

What are disadvantages of wood?

A
  • warped and cracked in moisture
  • esthetic and hygienic challenges
  • degradation in oral environment
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6
Q

How was bone chosen?

A

Due to availability, reasonable cost, and carvability

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7
Q

Why was bone advantageous for dentures?

A

Better dimensional stability than wood, esthetic and hygienic concerns remained

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8
Q

Why was ivory beneficial?

A

Esthetic and hygienic advantage in comparison with denture bases carved from wood or bone

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9
Q

What were advantages of ceramics over wood, bone, ivory?

A
  • could be shaped using additive technique rather than substractive
  • additive technique facilitated correction of denture base surface
  • intimate contact with underlying soft tissues
  • could be tinted
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10
Q

What are base metal alloy denture bases used in?

A

Automobile industry

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11
Q

What are denture base polymers?

A
  • vulcinate
  • polystyrene
  • vinyls
  • nylons
  • polymethyl methacrylate (PMMA)
  • urethane dimethacrylate (light activated)
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12
Q

What material had color, taste, and odor that was “less than ideal”?

A

Vulcanite

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13
Q

What are disadvantages of vulcanite?

A
  • absorbs saliva and becomes unhyginenic due to bacterial proliferation
  • poor esthetics
  • dimensionally unstable
  • objectionable taste and odor
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14
Q

What are disadvantages of celluloid?

A
  • lack of stability
  • unpleasant taste
  • unpleasant odor
  • sustainability
  • flammable
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15
Q

What are disadvantages of bakelite?

A
  • lack of uniform quality
  • variable strength
  • variable color
  • dimensional unstability
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16
Q

What are denture bases fabricated with now?

A

Poly(methyl methacrylate) resins

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17
Q

What is pure PMMA like?

A

Colorless, transparent solid

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18
Q

What is an advantage of PMMA?

A

Denture base material is relative ease with which it can be processed

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19
Q

How is PMMA supplied?

A

Powder and liquid system

20
Q

What are advantages of PMMA resin?

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
21
Q

What are PMMA resin ingredients?

A

Liquid monomer - methyl methacrylate
Powdered polymer - polymethyl methacrylate
Plasticizer - dibutyl phthalate
Initiater - benzoyl peroxide
Pigments

22
Q

What are the two components of PMMA resin?

A
  1. liquid monomer
  2. Powdered polymer
23
Q

What is the PMMA liquid?

A
  • methyl methacrylate
  • glycol dimethacrylate - a cross linnking agent
  • hydroquinone - inhibitor for increased shelf life
24
Q

What is the PMMA powder?

A
  • PMMA beads
  • pigments
  • plasticizer
  • benzoyl peroxide - initiator of polymerization
25
Q

What are the steps of curing?

A

Heat cure
Chemical cure
Light cure

26
Q

What are heat-activated denture bases used in?

A

Fabrication of all denture base

27
Q

What is required for polymerization?

A

Thermal energy - water bath or microwave oven

28
Q

What is the composition of heat activated denture base?

A

PMMA - powder and liquid
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

29
Q

How does monomer boils work?

A

Heat at surface of resin is conducted away into investing medium, hency no porosity on surface of resin

30
Q

Vaporization of what monomer affects the thick areas of denture base?

A

Monomer balls

31
Q

What are reasons that porosity is caused?

A

Irregular shape, located throughout the base:
- inadequate pressure
- not enough resin in mold
- improperly mixed resin

32
Q

Resin denture teeth are basically the same composition as?

A

Denture base resin, except for pigmentation to produce tooth shaed

33
Q

What two things bond to eachother?

A

Teeth and base

34
Q

What does an amine in the liquid react with?

A

The benzoyl peroxide in the powder to promote polymerization at room temp

35
Q

What is the fundamental difference between heat-activated vs autopolymerized?

A

Method of activation of the initiator benzoyl peroxide

36
Q

What does heat-activated have a greater degree of?

A

Polymerization

37
Q

What does heat activated have better stability of?

A

Color stability

38
Q

How is color stability of autopolymerized?

A

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

39
Q

What are light activated denture base resins?

A

Composite matrix of urethane dimethacryate, microfine silica, and high molecular weight acrylic resin monomer

40
Q

What is the activator for light activated denture base resins?

A

Visible light

41
Q

What is the initiator for light activated denture base resins?

A

Camphorquinone

42
Q

How is light activated denture base supplied?

A

In sheet and rope form packed in light proof pouches

43
Q

Light activated resin cannot be flasked in __________

A

Conventional manner

44
Q

What provides the passage of light in light activated denture base?

A

Opaque investing media

45
Q

How are teeth arranged and denture base sculpted using?

A

Light activated resin

D1 Spring - Complete Removable Pros (18 decks)

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