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DENTAL MATERIALS Test

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1.
When bonding what is considered a wetting agent for the preparation?
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2.
GAMMA-1 PHASE
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3.
Define Percolation
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4.
What material is used to control the rate of set of amalgam?
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5.
Scales commonly used to determine hardness of a material:
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6.
What factors contribute to dimensional changes?
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7.
How much Cu is in a High Copper Alloy?
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8.
Hom much Cu is in a low copper alloy?
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9.
What type of amalgam has no GAMMA-2 PHASE?
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10.
What materials dissolve into and absorb Mercury until the solution becomes saturated? How long does this process take?
A.
More than 12% Cu, superior to low Cu.
B.
HIGH COPPER AMALGAMS, which is why they are superior in performance
C.
Etch
D.
Less than 5% Cu
E.
Moh's scale, Brinnel and Knoop
F.
Tin.
G.
Silver and Tin. 24 hours
H.
*ratio of mercury to alloy *Compostion of alloy particles *Salivary/moisture contamination while manipulation and insertion *perspiration on fingers contribute to moisture if amalgam is touched
I.
Movement of fluid in a microscopic open margin between tooth and restoration caused by constant thermal changes. Causes irritation to pulp and recurrent decay.
J.
This consists of mercury reacting with the silver. It is also strong and corrosion resistant, although not as resistant as the Gamma Phase.
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11.
Over manipulation of sealants creates...
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12.
What type of amalgams have much more corrosion because of the chemical reaction of tin and mercury?
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13.
What results from undertrituration?
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14.
What phase is eliminated with high copper alloys?
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15.
Lower Creep
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16.
When does setting time of amalgam begin?
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17.
Gradual dimensional change of amalgam caused by compression from occlusion
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18.
most commonly used resin for composites as well as sealants. Also known as the MONOMER of the mixture.
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19.
This is the silver alloy phase. This is the STRONGEST phase and has the least corrosion.
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20.
This consists of the reaction with mercury and tin. This is the WEAKEST phase and corrodes readily. This phase is eliminated with high copper alloys.

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