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EFDA PT 2. Final Exam - Harcum College Questions and Answers Correct
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EFDA PT 2. Final Exam - Harcum College
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EFDA PT 2. Final Exam - Harcum CollegeWhy would someone get an amalgam restoration? - answer-when cost is an issue
- when moisture is problematic
Mercury + Alloy = - answer Amalgam
Silver - answer Combines easily with Mercury
Copper - answer Strength, decreases expansion
Tin - answerAids in combining Mercury with alloy
Zinc - answerPrevents oxidation
Creep - answerSlow flow of material, has force
Maliable - answer(Softness) able to be condensed
Ductile - answer(Moveable) able to move around
What are the characteristics of amalgam - answer- strength
(- size and shape of alloy particles
-ratio of mercury + alloy
- manipulation)
-setting time
Conventional alloy particles - answerRegular, fine, micro cut
Spherical alloy particles - answerLower mercury to alloy ratio/ more expensive
Dispersion alloy particles - answerMix of the different particle types, control the structure
of the hardened amalgam/commonly used
The higher % of mercury - answerAmalgam is easier to mix and slower to set
The lower % of mercury - answerWeakens the amalgam and makes polishing more
difficult
What happens if amalgam is contaminated with moisture? - answerIt will stick to the
prep and cause expanded retraction. Try to reduce
, Overmixed - answerVery soupy, hard to remove from capsule, too much mercury,
decrease triturator
Normal mixed - answerComes out of capsule in one dull mass easily removed from
capsule, looks velvety (grayish)
Undermixed - answerCrumbly, not wet enough with mercury, increase triturator setting
What causes amalgam to fail - answer-breakdown of the margins; just sits in the tooth
does not bond/seal
- mercury mixed with tin (gamma 2 phase) will weaken amalgam
-CREEP: slow flow of a material overtime under stress (like a force mastication)
-manipulation : if not mixed properly
What are the physical properties of amalgam? - answer- dimensional change
- strength
- galvanism
- creep
-corrosion and tarnish
Galvanism - answerwhen two dissimilar metals touch with saliva battery causing an
electric shock
Corrosion - answerDeterioration of an eroded metal
Tarnish - answerDiscoloration
Where should dental scrap amalgam be discarded? - answer- in one container labeled :
CONTACT AMALGAM(amalgam that has been in a patients mouth)
-In another container labeled NON-CONTACT
What should you NEVER do when handling amalgam? - answer-rinse scrap amalgam
down the drain
- place scrap in medical waste red bag
- place scrap amalgam in the trash
Amalgams come as... - answer- dispensers for the mercury and the alloy
-capsule
Before placing any amalgam in the tooth, you must first - answerTry in the condenser
and make an mental image
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