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AU17 - Dental Materials 3 Final > Amalgam Selection > Flashcards

Amalgam Selection Flashcards

1
Q

True or False: Amalgams can cause fractured cusps.

A

False

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2
Q

True or False: Amalgams often have recurrent caries.

A

False

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3
Q

True or False: Resin composites last longer than amalgam.

A

False

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4
Q

True or False: Amalgam can be bonded to teeth

A

True (really?)

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5
Q

True or False: Amalgam is old, composite is new and therfore better

A

False, new is not always better

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6
Q

True or False: The ADA supports amalgam for fear of lawsuits.

A

No evidence/opinion

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7
Q

True or False: The ADA holds the patent for amalgam.

A

False

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8
Q

True or False: Amalgam is banned in Germany and Sweden.

A

False

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9
Q

From where do humans get most of their mercury exposure?

A

fish

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10
Q

Minamata disease was discovered in ____ after industrial wastewater polluted waters and accumulated highly toxic doses of mercury in ____.

A

Japan

shellfish and fish

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11
Q

What is the amount of Mercury exposure claimed to be released from amalgam fillings, per day?

A

1.5 to 50 micrograms/day

however, at 50micrograms per day for 3 years, 10% of the filling would be gone…that’s just not the case

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12
Q

True or False: Comparing amalgam to composite, children with amalgam fillings excreted more mercury in urine.

A

True, but they did not have adverse renal effects because of it

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13
Q

True or False: There is a statistically significant difference in adverse neuropsychological effects in children with amalgam.

A

False

*it is possible that very small IQ effects cannot be ruled out, however, there could be selection bias

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14
Q

True or False: A retrospective cohort is at the highest level of evidence.

A

False

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15
Q

True or False: The amalgam cohort study provided sound evidence of an association between amalgam and disease.

A

False, limited evidence on an association

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16
Q

True or False: Mercury containing fillings placed during pregnancy increased the risk for low-birth weight children.

A

False

17
Q

True or False: Numerous clinical studies have shown the improved performance of amalgam over composite for larger restorations.

A

True

18
Q

True or False: Amalgam is just as easily colonized by bacteria when compared to composite.

A

False, less easily colonized

19
Q

Is high or low copper amalgam better?

A

High Copper

  • low corrosion
  • high strength
  • low creep
  • high longevity
20
Q

Which phase in the amalgam setting reaction is eliminated by copper?

A

gamma 2 phase!

-the phase that is responsible for poor physical and chemical properties (corrosion, low strength, etc)

21
Q

Which phase interlocks grains of Cu-Sn and prevents sliding at grain boundaries?

A

n-prime

22
Q

True or False: Spherical amalgam particles results in smooth carving.

A

True, its “squishy” but shines up nicely if you can handle it properly

23
Q

True or False: Lathe cut amalgam results in better proximal contacts and fewer overhangs.

A

True

24
Q

Admixed or blended particles will handle like ____ alloys.

A

lathe-cut (easier to condense against)

25
Q

What is zinc’s purpose in amalgam?

A

antioxidant (prolong shelf life)

26
Q

True or False: Permite amalgam (clinic use) contains zinc.

A

True

Permite contains zinc… which justifies using 40 year old amalgam cartridges in clinic

27
Q

If amalgam contains zinc, what must be controlled during placement?

A

MOISTURE

delays setting reaction, zinc containing amalgam should not be used for apicoectomy

28
Q

What are the three species of mercury exposure in the United States?

A

Elemental (Hgo),
Inorganic (Hg2+)
Methylmercury

29
Q

Which species of mercury is contained in fish?

A

methylmercury

30
Q

Which fish contain >1ppm of methylmercury?

A

Shark, Swordfish, King Mackerel, and Tilefish

31
Q

True or False: Species with characteristically high levels of mercury include shrimp, tilapia, salmon, pollock, and catfish.

A

False, these fish have low levels

32
Q

True or False: 25 amalgam surfaces may increase the brain mercury concentration by about 10 µg/kg.

A

True

33
Q

Slow setting amalgam has a _____ ratio of mercury to alloy.

A

High

think of the mercury as being “wet” which means the restoration takes longer to “dry/set” when there’s more Hg

34
Q

True or False: Lower mercury-to-alloy ratio = faster set.

A

True

AU17 - Dental Materials 3 Final (6 decks)

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