Denture Base Resins Flashcards

1
Q

What is resin?

A

a broad term used to describe natural oof synthetic substances that form plasti cmaterails after polymerization

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2
Q

What is acrylic?

A

designating a colorless, pungent acid

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3
Q

What are the properties of PMMA resin?

A
  • excellent esthetic properties
  • adequate strength
  • low water sorption
  • low solubility
  • non-toxic, low allergenicity
  • easily repaired
  • reproduced detail accurately
  • simple molding and processing technique
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4
Q

What are the ingredients of PMMA resin?

A
  • liquid monomer (methyl methacrylate)
  • powdered polymer (polymethyl methacrylate)
  • plasticizer (dibutyl phthalate)
  • initator (benzoyl peroxide)
  • pigments
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5
Q

What does the PMMA liquid contain?

A
  • methyl methacrylate
  • glycol dimetacrylate (cross-linking)
  • hydroquinone (increase shelf life)
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6
Q

What are the different types of acrylic resin?

A
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7
Q

What are the systems of PMMA resin?

A
  • liquid monomer
  • powdered polymer
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8
Q

What does the PMMA powder contain?

A
  • PMMA beads
  • pigments
  • plasticizer (dibutyl phthalate)
  • benzoyl peroxide (initator of polymerization)
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9
Q

What types of cure can resin have?

A
  • heat cure
  • chemical cure
  • light cure
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10
Q

What are the characteristics of heat-activated denture base?

A
  • used in fabrication of all denture base
  • thermal energy required for polymerization
  • composition
  • PMMA (powder and liquid)
  • Powder
  • Liquid
  • cross linking agent is added to liquid
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11
Q

What are the techniques to process denture resins?

A
  • compression molding
  • injection modling technique
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12
Q

What are the bubbles in the processed denture called?

A

porosity
- spherical bubbles inside resin

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13
Q

What is the difference between internal and other types of porosity?

A
  • internal porosity (caused by a temperature above 100 degrees C inside the flask)
  • other porosity (inadequate pressure, not enough resin in mold, improperly mixed resin)
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14
Q

What are denture teeth made of?

A
  • same composition as the denture base resin, except for pigmentation to produce tooth shades
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15
Q

What is an autopolymerized resin?

A
  • amine in the liquid reacts with the benzoyl peroxide in the powder to promote polymerization at room temp
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16
Q

Whats the difference between heat-activated and autopolymerized?

A
  • the method of activation of the initator is benzyol peroxide
  • a greater degree of polymerization with head-activated
  • better color stability with heat-activated
17
Q

What are the characteristics of the light activated denture base resins?

A
18
Q

What is the CAD/CAM technology used for in dentures?

A

use an acrylic base milling puck and shade guide then send it in to the lab