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31 Cards in this Set
- Front
- Back
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_______ is a metal alloy of which one of the elements is mercury.
Silver and tin |
amalgam
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______-any combination of 2 or more metals
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Alloy
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The process of mixing the powdered alloy with the liquid metal is called ______.
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AMALGAMATION or TRITURATION
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First increment of amalgam is placed in the preparation and _______ to eliminate voids
Second and succeeding increments to overfill Carving while soft |
condensed
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_______ is a slow change in shape caused by compression. This is also less present in high copper amalgam
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Creep
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Overhang
______= slight catch with explorer |
type I
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overhang
______=definite catch with the explorer may need replaced(visible on xrays) |
type II
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overhang
_______=gross overhang-needs to be replaced |
type III
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______ is an excess amount of amalgam that extends beyond the cavosurface margin and it causes improper placement of the matrix band or wedge during amalgam condensation. It increases susceptibility to decay and periodontal disease
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overhang
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Typical problems with amalgams are _______...
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recurrent caries
marginal breakdown open margins fractures overhangs open contacts tarnish corrosion |
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______ is surface discoloration caused by lack of cleanliness, biofilm accum., certain foods, acidic beverages.
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tarnish
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______ is deterioration caused by chemical or electro-chemical reaction.
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corrosion
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marginal corrosion= ______
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recurrent decay
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What are the 5 reasons to have amalgam polishing?
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-refining anatomy and occlusion
-minimize retention of hard and soft deposits -makes plaque control easier -life of restoration by eliminating irregularities -tarnish and corrosion resistance |
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selection criteria
____________- newer spherical amal can be polished after placement, carving and finishing, others need ___hrs. |
polish new amalgam
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Selection criteria
make sure amalgam does not need _________ no recurrent caries no marginal breakdown no open margins no fractures no excessive overhangs no open contacts |
replacement
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Selection criteria
make sure.. anatomy can be maintained occlusion can be maintained margins can be _______ |
flush
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Selection criteria
corrosion and _________ less frequent with polishing |
tarnish
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_______ is the process of contouring to remove excess material and produce a smooth surface
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finishing
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________ is creating a smooth surface without the use of a film and surface reflects light uniformly.
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polishing
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When do overhangs need to be removed?
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type II (possibly)
type III-needs replacement |
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steps in amalgam polishing
1. evaluate restoration 2. confirm with ____ 3. review procedure with patient 4. informed consent 5. check _______ 6. remove excess margins (_____) 7. finish cavosurface margins 8. smooth all surfaces of the restoration (_____) |
1. evaluate restoration
2. confirm with (DDS) 3. review procedure with patient 4. informed consent 5. check (occlusion) 6. remove excess margins (marginate) 7. finish cavosurface margins 8. smooth all surfaces of the restoration (polish) |
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Factors affecting abrasion....6 factors
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hardness
size shape pressure speed lubrication |
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Hardness of abrasive particle must be ____ than the surface being abraded if acceptable rate of abrasion is to occur.
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harder
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______ abrasive particles will produce deeper scratches than _____ particles will.
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larger
smaller |
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______ shaped particle would be less abrasive than an irregular shaped particle.
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spherical
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Raising the temperature (excessive pressure and speed) of amalgam could release ______ to the surface, which will increase corrosion and contribute to marginal breakdown.
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mercury
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During finishing and polishing, lubrication is recommended to carry the heat that is created by the abrasive action away from the surface.
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study
(slurry or paste texture) |
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Technique for polishing
pressure= _____ speed=_____ quantity=______ lubrication=_______ abrasives=(2)_______ |
pressure= _____light
speed=_____low quantity=______intermittent lubrication=_______wet (slurry) abrasives=(2)_______ tin oxide,pumice |
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Sequence for polishing....stones
b g sg f e |
brown point
green point super-greenie floss proximal with pumice evaluate polished amalgam |
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Overheating a restoration during finishing and polishing can cause... (3)
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irreversible pulp damage
pt. discomfort sensitivity |
