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30 Cards in this Set
- Front
- Back
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1. _______________ is the principal kind of denture resin used for denture bases presently.
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polymethyl methacrylate
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2. T of F:
__ Polymethyl methacrylate is supplied as a monomer (liquid) and polymer (powder) that is mixed together. |
TRUE
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3. T or F:
_____ When polymethyl methacrylate is mixed together, the result is a sticky, doughlike mass that can easily be shaped to fit a mold space. |
True
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4. T or F:
_____ The chemical reaction between polymer and monomer will continue after the two halves of the mold are closed. |
True
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5. JEOPARDY QUESTION: “Responsible for converting a resin dough into a hard plastic, this chemical process takes place when polymer and monomers are mixed.”
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What is polymerization?
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6. The two classes of acrylic resin are _____ and _________
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heat cured; chemically activated
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7. JEOPARDY QUESTION: “These type of resin materials polymerize by heating the monomerpolymer
dough in the mold, thereby hardening the material.” |
“What are heatcuring acrylic resins?”
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8. JEOPARDY QUESTION: Selfcuring, coldcuring, and autopolymerizing resins are all examples of this type of acrylic resin, in which polymerization takes place without the
application of heat. |
“What is a chemically activated acrylic resin?”
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9. The monomer portion of a chemically activated resin contains a substance called
_______ that makes monomer and polymers polymerize without applying heat to the dough. |
dimethyl paratoluidine
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10. T or F:
_____ The most commonly used acrylic resin used for processing complete denture in the dental lab are autopolymerizing types. |
F (Heatcuring resin is preferred for this purpose because it is stronger and more color stable than autopolymerizing types)
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11. T or F: _____ Autopolymerizing resins have less dimensional change than heat cured resins.
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True
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12. T or F:
_____ When mixing heatcured acrylic resins, it is important that meticulous cleanliness be achieved to prevent any foreign matter from getting into the dough |
True
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13. From the following list, choose the items needed for mixing acrylic resins.
a. glass mixing jar and lid b. stainless steel mixing spatula c. boil‐out tank d. two graduated cylinders e. baseplate wax |
A, B, D
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14. In the absence of manufacturers instructions, a ration of ______ parts monomer and _____ parts polymer should be used.
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1:3
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15. The average unit measure of monomer to polymer is _____cc to ______cc
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10:30
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16. T or F:
Polymer and monomer should be mixed by “adding liquid to powder”. |
F (always add powder to liquid)
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17. T or F:
_____ By mixing powder into liquid for acrylic resins, the amount of air entrapped in the dough is reduced. |
True
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18. T or F:
_____ When mixing polymer and monomer, the mixture should be stirred gently as opposed to whipped. |
True
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19. T or F:
_____ When not in use, monomer jars should have the lids on them to keep the monomer from polymerizing prematurely |
FALSE (Lids should be kept on the monomer jars to prevent evaporation)
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20. Once polymer and monomer is mixed and ready to physically handle, disposable gloves or plastic sheets should be worn so that:
a. your hands are protected from the irritating effects of uncured monomer b. the resin dough will have less resistance on gloves than skin c. skin oils and dirt on the hands will not contaminate the resin dough d. the resin dough will not stick |
A and C
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21. List the two ways to tell that an acrylic resin has reached the “dough” stage of mixing.
a.___________ b.___________ |
(a. when the mixture is stirred with a spatula, it is “doughy”, but not sticky and does not adhere to the walls of the mixing jar;
b. When handling the dough, it has a tendency to “snap” if you pull it apart.) |
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22. T or F:
_____ If acrylic resin is packed at the “sandy” or “stringy” stage the material will be too stiff to work with, and you must start with a fresh batch. |
F (it packed at this stage, the resin will flow too readily from the mold.)
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23. If acrylic resin is packed into a mold prematurely, the material will not have enough body to pack well and will flow from the mold, resulting in:
a. denture base porosity b. record base porosity c. porosity in the denture teeth occlusal planes d. patches of missing hair, crying, and a mad dash to ask for help from Professor Mattes. |
A (and…probably D also)
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24. If the acrylic resin is packed into a denture at a very stiff stage, it will;
a. not flow under the pressure the press generates b. result in a loss of denture base detail c. result in possible movement of the teeth d. probable opening of the VDO. e. all of the above |
E
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25. The equipment and materials needed for packing hea tcuring resin into a denture mold are:
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(Bench Press; carrier press, wrench and handle;
Plastic sheets and gloves; Tinfoil substitute and brush) |
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26. The steps for packing a heat curing acrylic resin into a denture mold are listed below.
Arrange them into the correct order. a. trial packing b. flatten the dough c. cut the material to fit denture features and trim the flash d. final closure e. roll the resin dough |
(e, b, c, a, d)
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27. When rolling resin dough, it should come out being sausage shaped, and ____ thick.
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1 inch
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28. Once rolled, the resindough should be placed between either two sheets of plastic or moist cellophane and flattened to a thickness of ______mm.
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3mm
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29. The resindough
material should be cut into appropriate shapes for the ____, and ___ for a maxillary denture mold cavity. |
labial, buccal, and lingual flanges.
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30. T or F:
_____When cutting resindough pieces , fiber alignment is important. |
True
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