ch 13 cements

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ch 13 cements
2011-04-20 20:42:47
dental materials red

ch 13 cements
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  1. most dental cements have what kind of strength and solubility when being compared to other restorative material?
    • INFERIOR strength
    • HIGH solubility
  2. what are three advantages of a varnish?
    • seal dentinal tubules by 2-3 layers
    • reduce micro-leakage and staining
    • dentin bonding agents largely replaced varnish
  3. what is the pH of calcium hydroxide?
    9-11 (alkaline)
  4. what does alkali calcium hydroxide stimulate and what is it used for?
    stimulates secondary dentin used for pulp capping
  5. what is calcium hydroxide?
    a liner/low-strength base
  6. T/F a high strength base is > 0.5mm for thermal protection over metal
    FALSE! under metal
  7. a high strength base provides thermal ___________ and __________ support for restorations
    • insulation
    • mechanical
  8. why would a sedative be used for TEMPORARY fillings?
    to evaluate the response of the pulp before placing a final restoration (in case a RCT is needed)
  9. glass ionomer is used for which types of Black's classification restorations? (hint: "GI" Joes are Odd)
    1, 3, 5
  10. what is the strongest cement?
    RESIN cement
  11. what cement is highest in mechanical strength?
    RESIN cement
  12. if you want to strengthen the cement, what is it controlled by?
    the amount of powder used
  13. T/F an INCREASE in powder to liquid ration INCREASES the strength of the cement
    TRUE! (BUT if you use too much, it weakens it)
  14. what is the LEAST SOLUBLE cement?
    resin-containing cement
  15. adding powder to a cement will increase _________, increase ________, and decrease _________ of the cement
    • strength
    • viscosity
    • solubility
  16. Dual cure is used in which type of which type of restoration?
    one that cannot penetrate light
  17. Which cement CAN you USE alcohol to clean up the spatula and glass slab?
    ZOE! (she is so cool! she likes alcohol)
  18. zinc oxide eugenol is used for what type of cementations? (2)
    • TEMPORARY and
  19. eugenol has a _______ and _______ effect on the pulp
    sedative and antibacterial
  20. T/F eugenol cannot be used when dealing with the process of resins because it interferes with the polymerization process
  21. what is not used under composites before final cementation with hybrid glass ionomer or resin cements?
  22. what type of CHEMICAL reaction occurs with zinc phosphate?
  23. what kind of incorporation of powder to liquid on a cooled glass slab when mixing zinc phosphate?
  24. why is incremental incorporation of powder into liquid on a cooled glass slab necessary over a LARGE area? (3)
    • to dissipate heat
    • lengthen working time
    • neutralize chemicals
  25. what is the liquid in a zinc polycarboxylate cement?
    POLYacrylic acid
  26. what liquid has minimum pulpal irritation in a dental cement?
    poyacrylic acid (in zinc carboxylate)
  27. which cement can no longer be used when it loses its gloss and become stringy?
    zinc polycarboxylate
  28. which type(s) of retention do zinc polycarboxylate cements have?
    chemical AND mechanical
  29. zinc carboxylate has ______ viscosity and ______ compressive strength
    • HIGH viscosity
    • LOW compressive strength
  30. what does GIC stand for?
    glass ionomer cement
  31. which type of bond does a GIC use?
    CHEMICAL bond with tooth structure
  32. what kind of base does a GIC have?
    HIGH strength base
  33. which cement is fluoride releasing?
    Glass Ionomer
  34. what is the component that adds radiopacity to glass ionomer cement?
  35. margins of restorations are coated with GI agent or varnish to protect from what?
  36. T/F fluoride releasing agents MAY have anti-cariogenic effect
  37. what is a resin modified glass ionomer cement?
    GI with addition of resin
  38. what is a hybrid ionomer cement also called?
    resin modified glass ionomer cement
  39. what cement is virtually insoluble in oral fluids and is fluoride releasing?
    hybrid ionomer cement
  40. why is hybrid ionomer cement not used for cementing all indirect restorations?
    because of fracture risk due to expansion (absorbs moisture after seating)
  41. MOST METAL FREE indirect restorations can be cemented ONLY with _______ cements
  42. resin based cements are virtually ________ in oral fluids
  43. when should eugenol not be used?
    in TEMPORARY cements when BONDING permanently is necessary