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Name some properties of acrylics
- Easily colored
- Acrylic resins are hard, brittle, glassy polymers
- They are biocompatible
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In acrylics the monomers are linked together to form
polymers
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The most common acrylic monomer is
methyl methacrylate
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Example of non dental use is
Plexiglas
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What turns on the initiator
Activator
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What starts the reaction by opening up the carbon double bond
Initiator
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The monomer is the
An organic molecule containing carbon-carbon double bond
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When the initiator frees the electron it creates a
free radical (C-C*).
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What reactions that acrylics use is
Addition Polymerization
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What are acrylics used for
- removable prosthetics
- custom trays
- orthodontic appliances
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What are the types of activators
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Setting is the process of
Propagation
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When polymers are crosslinked , a bunch of chains all become
one big molecule
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Crosslinking agents are
side groups of polymers that are made are made of molecules that tie the growing chains together into one solid mass
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Crosslinked agents result in a product that has
Increased strength, increased toughness of material, and reduced brittleness of the final product
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________allows for more flexible dentures, more resilient to impact
Copolymers
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Copolymers is the
use of two or more different monomers when polymerizing final product
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The addition polymerization reaction leads to some monomer being leftover in final product called
Residual Monomer
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As propagation continues, the solidifying mass _______ and the end product is ______
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What are some uses for plastic polymers in dentistry
- Denture bases
- Artificial teeth
- Sealants
- Tooth colored restoratives ex. composite fillings
- Orthodontic appliances
- Reline materials
- Impression materials
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Cold Cured Acrylic Resin is also called
Self cure and chemical cure
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What are Cold Cured Acrylic Resin used for
Used for repairs on denture bases, orthodontic appliances, custom trays, temporary crowns
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Cold Cured Acrylic Resin are supplied
powder and liquid
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The liquid of a Cold Cured Acrylic Resin contains
- Monomer = Methylmethacrylate
- Inhibitor = Hydroquinone
- Activator = a tertiary amine
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The powders of a Cold Cured Acrylic Resin contains
- Polymethylmethacrylate resin (PMMA)
- Initiator = Benzoyl peroxide
- Coloring agents
- Copolymers
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What are some comparisons of Cold Cure Acrylic vs Heat activated acrylic
- Cold cure acrylic has less shrinkage than heat cured acrylic
- Cold cure acrylic has more residual monomer than with heat activated acrylic
- Cold cure acrylic has less heat thanheat activated acrylic, however, heat is still generated
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What are Heat Cured Denture Resin used for
to fabricate tissue coverage of full and partial denture saddles (everything except the teeth)
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How is Heat Cured Denture Resin supplied as
powder and liquid
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What is the activator for the Heat Cured Denture Resin
hot water bath
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The liquid of a Heat Cured Denture Resin contains
Monomer = Methylmethacrylate (MMA) Inhibitor = Hydroquinone (preservative) Cross Linking Agent
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The powder of a Heat Cured Denture Resin
- Polymethylmethacrylate resin (PMMA)
- Initiator = Benzoyl Peroxide
- Coloring Agents
- Copolymers
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Dual cure is cured by both
- light and chemical cure.
- Light starts the cure, and it is finished chemically.)
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Porosity is a major concern because it leads to
sorption
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What are the Physical Properties of Denture Acrylic
- Low Impact Strength – easily broken
- Low Abrasion Resistance – take care when cleaning
- Warping – never store or clean with hot water
- Porosity – microporosity allows for growth of microorganisms
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Complete dentures are made up of what two parts
- the denture teeth and
- the denture base
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What is the denture base
the pink part of the denture that sits on the alveolar ridge
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What follows the extraction of teeth
Resorption of ridge
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Acrylic teeth are _________ into the base
chemically bonded
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The most common types of teeth is
acrylic teeth
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The occlusal forces of acrylic teeth as compared to porcelain teeth are
softer and much kinder to the opposing teeth and ridge
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Porcelain teeth are held in place
only by mechanical retention (a pin)
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Which is more porous acrylic or porcelain
acrylic
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What are the steps to fabricating a denture
- Custom Tray and Final Impression
- Preliminary Impression and Cast
- Wax Rims and Records
- Wax Try-In
- Processing, Finishing, Polishing
- Delivery, Follow-up
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The preliminary impression and cast is taken with
a stock tray
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The final impression with a custom tray is taken with what type of material
vinylpolysiloxane or ZOE
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What is used to record the maxillary and mandibular relationship and arranging teeth
wax rims
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Wax rims are made with
Wax or Acrylic
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Wax rims are also called
occlusal rims
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What is sometimes used to impress the borders of a final impression
Impression compound
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We make dentures with what kind of arylic
heat-cured
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Processing the denture involves
removing the wax and replacing it with acrylic
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A removable partial denture uses some of the remaining teeth to serve as ______ to assist the retention of the prosthesis
abutments
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An RPD is composed of a ______ and ______ that are holding the denture teeth
- metal framework
- acrylic saddle areas
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Undercuts are located
Right under the height of contour
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A chairside reline uses what type of acrylic
cold cure and light cure
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A lab reline uses what type of acrylic
heat-cured
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What is tissue conditioning reline material used for
- Often done first to heal tissue prior to an acrylic reline procedure
- A person getting an immediate denture
- medicated, very temporary medicament is placed in the denture over traumatized or recently surgerized tissue
- Only last a month
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How long can a soft liner last for
12-24 months
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epulis fissuratum
overgrowth of tissue due to ill fitting dentures sitting on the musoca
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Repairing acrylic Prosthesis used _______ acrylic material as _____ to repair the fracture
- chemical activated/cold cure
- glue
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What are the steps to repairing Acrylic Prosthesis
- 1.)Clean the surface – may have to grind as little
- 2.)Apply monomer
- 3.)Apply new acrylic material
- 4.)Finish and polish
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Dentures should be out of the mouth for _____ hours daily and stored in ______
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