POLYMERS
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| The use of polymers was made possible by -----when he created vulcanized rubber. | Charles Goodyear
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| 15-20 years later the material was introduced as a denture base called ----- or ------- | Ebonite or Vulcanite
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| Large long molecules formed by smaller molecules called monomers. | Polymers
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| When small molecules are different but compatible they are called ------- | copolymer
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| Chemical reaction that links the monomers together is called | polymerization
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| Polymers are plastics such as | acrylics and plexi-glass
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| Long linear chains of molecules that can be heated, molded or shaped and may be remelted and reprocessed. SOFT and FLEXIBLE | Thermoplastic polymers
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| Cross-linked chains of molecules that cannot be heated or remolded, a chemical change takes place and they need to be in their final shape when polymerization takes place. | Thermoset polymers.
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| Denture bases, acrylic teeth and retainers are examples of what type of polymer? | Thermoset
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| Polymerization of acrylics are referred to as | Addition Polymerization
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| Most common form of polymerization | Addition polymerization
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| Composite resins, cements, sealants, and adhesives all set by way of ----------- | Addition polymerization
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| What are acrylic resins used for? | temporary crowns, custom trays, and base plate for dentures.
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| Most commonly used resin | cold cure or chemically cured
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| Liquid: MONOMER | Methyl Methacrylate
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| What is added to improve the toughness of the material? | A cross-linking agent
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| What is added to prevent premature polymerization during storage? | An inhibitor
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| What is the most commonly used inhibitor? | Hydroquinone.
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| Cold cure or chemically activated......powder: | Polymethylmethacrylate polymer
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| What is the cross-linking agent used in heat cured to improve the toughness of the material and help prevent craze lines? | Glycol Dimethacrylate
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| What type of cured material uses a type of "pressure cooker?" | heat cured
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| Steps in Addition Polymerization: | 1. Initiation 2. Propagation 3. Termination
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| 1. Initiation | Begins the addition polymerization
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| 2. Propagation | Growth or lengthening of the monomer chain
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| 3. Termination | Termination of polymerization
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| Heat activated: Acrylic resins are typically activated with -------as the initiatior and ------- as the activator. | benzoyl peroxide, heat
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| Light activated and dual cure composites are being introduced for | temporary crowns and custom trays
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| Name one advantage and disadvantage of light activated and dual cured resins: | advantage-stronger than acrylic disadvantage-price needs to come down
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| Example of an acrylic appliance: | Orthodontic retainers
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| Teeth for dentures may be ------or----- | acrylic or porcelain
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| Acrylic based soft liners for dentures are | heat or cold cured
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| What is used to cover the tissue bearing aspect of a denture when a patient cannot tolerate the hard acrylic on their mucosa? | denture liner
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| Tissue conditioners: What is used when the mucosa is so irritated that they have a hard time wearing the prosthesis? | a temporary soft liner
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| --------------------------- loaded with plasticizers such as alcohol to make it soft. | Polymethylmethacrylate polymer
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| What are some of the disadvantages of using materials that go through polymerization such as composites, dentures, and retainers? | a high thermal coefficient of expansion, shrinkage occurs, they can irritate pulp
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| At home care of acrylic resin dentures: | denture brush, non abrasive denture paste before placing in soak bath, calculus can be softened by a 1:1 solution of white vinegar and water, liquid soap can be used
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| Storage of acrylic resin dentures | water to prevent warping, water while out during prophy, prosthesis with soft liner-NO mouthwash, alcohol has an adverse affect.
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| In office care of acrylic resin dentures: | tartar and stain remover, can be gently scaled
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