Dental Materials

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Author:
sthomp88
ID:
78008
Filename:
Dental Materials
Updated:
2011-04-21 16:30:30
Tags:
Chapter eighteen
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Description:
week twelve
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  1. Dental waxes are composed of a mixture of components from _________ and _____________ sources
    • natural
    • synthetic
  2. What are 3 natural waxes that are used in the composition of dental waxes?
    • plants: canauba wax
    • insects: beeswax
    • minerals: paraffin wax
  3. natural waxes are combined or mixed with synthetic waxes and which other 6 substances; to give desired physical properties for particular dental applications?
    • gums
    • fats
    • oils
    • resins
    • coloring agents
  4. What are 4 factors that affect wax selection?
    • MELTING RANGE: temperature increases, melting point decreases
    • flow
    • thermal expansion
    • excess residue
  5. What happens to the wax when it is in its melting range? What is needed for this to happen?
    • wax starts to soften and FLOW
    • flame is needed
  6. in regards to the FLOW of wax, as the temperature increases, the viscosity _____________ resulting in _______ flow
    • decreases
    • greater
  7. What is the problem with 'excess residue' of wax?
    wax residue may result in inaccuracies of produced object
  8. Which dental material has the greatest thermal expansion and contraction?
    wax
  9. Wax patterns should be invested within ____ minutes of carving
    30 minutes
  10. true or false. investment powder and water should be measured and vacuum mixed for the best results in the casting procedure
    true
  11. Which type of waxes are used to construct metal castings and bases for dentures?
    pattern waxes
  12. Which type of waxes are used to produce patterns for metal casting through the lost wax technique? These waxes are usually supplied in dark colors of blue or green.
    inlay waxes
  13. What technique of inlay wax is used directly in the mouth called the 'direct wax technique', and because of this has a lower melting range?
    Type I
  14. What technique of wax inlay is done indirectly on a model of teeth in a lab; the 'indirect wax technique'?
    Type II
  15. Which type of wax is used for metal framework of partial and complete dentures?
    casting wax
  16. Which type of wax is pink, and is used for denture teeth placement?
    baseplate wax
  17. Which type of waxes are used primarily to aid in dental procedures both clinically and in the lab?
    processing waxes
  18. Which type of processing wax is red, and forms the base of gypsum models?
    boxing wax
  19. Which type of wax coems in ropes to customize impression trays, has a better vestibular fit, covers the sharp edges of ortho brackets, and is also called periphery wax?
    utility wax
  20. Which type of wax is used to adhere components of metal, gypsum, or resin together during fabrication and repair? It is brittle, and will break at the slightest torque which is a sign of distortion during manipulation
    sticky wax
  21. Which type of wax is used in conjuction with other impression materials in the process of taking edentulous impressions? It can be used to correct undercuts.
    corrective impression wax
  22. How should waxes be stored to avoid distortion?
    store slightly below room temperature
  23. What wax technique is used for casting gold and other dental metals for dental restorations in molds?
    lost wax technique
  24. Impressions of preparation in the lost wax technique are poured into a high strength stone, what type is the stone?
    die stone

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