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the ability to be molded, upon mixing allows us to place it into the cavity preparation with rentetive features while it is moldable, and have it set up hard so it is held in place, like two puzzle parts fitting togeher
is teh strenght of amalgam that resists being pulled apart, such as the proximal box of amalgam being broken off of teh occlusal portion by pulling it apart at the thines area
narrower portion of a preparation that connects the occlusal portion with a proximal box or extension
amalgam must be well____and not over carved especially in the isthmus in order to maintain excellent bluk, thereby improving properties that would resist being broekn apart
Who must removed flash sinc it would break under occlusal forces and result in rough margins that would collect plaque?
amalgam undergoase dimensional changes about___and ___times that of a tooth when subjected to changes in temperature, which is clinically tolerable
3 and 1/2 times
the tooth does not change in size to the same extent as the dental amalgam, so an___ and ___of a space between the tooth and filling can suck in and then push out oral fluids into the small space
opening and closing
the dimensional changes that occur upon temperature changes can be measured as a number called the
coefficient of thermal expansion
the more difference between the coefficient of expanison for the tooth and the coefficient for the filling, the moer likely___and ____ will occur
percolation and subsequent sensitivity will occur
the generally undesirable chemicla breakdown of amalgam similar to the rusting of exposed car metal
the difference in oxygen concentrations sets up a condition that is doncutive for what to occur
oral fluid found in small, microscopic pit of amalgam have less or more oxygen thatn fluid elsewehre on the amalgam surface
the negative result of corrosion may be______of the amalgam surface, the poorer physical properties resulting in teh need to replace the amalgam
corrosion products also provide a benefit by___
slowly filling in teh microscopic gap that exists between amalgam and tooth, reducing post operative sensitivity over time
this is poor between the tooth and amalgam, which allows fluids and bacteria into and out of the dentinal tubules resulting in irritation
seal at the margin
a thin protective layer of insoluble material called____ is used to protect the tubules when dentinal procteciton is required
amalgam resists _____or wearing away with rubbing froces from opposing teeth or restorations
abrasion , abrasion resistance
a quality of amagalm that is not desirable since hot and cold conducted through the amalgam toward the pump may result in discomfort
thermal conductivity, is a good thermal conductor
thick layer of thermal insulating base may be used in deep preparation under metallic restorations that are lcose to the pulp, what is the thermal insulating base
zinc oxide, eugenol, glass ionomer
when plaed under foce, amalgam deofrms to become thinner and iwder so it appears to ____of the preparation
grow out , creeping out
occurs when dissimilar metal in the mouth are connecte dthrough a lyaer of saliva and act like a battery
when the teth with these dissimilar metals come together during fucntion, an electrical current is conducted through _____between two different metal and inot the pulp. resulting in sharp immediate nerve irritation
when does galvanism occur
newly placed restorations but usually diminishes as teh surface of restorations change chemicall over a few weeks
mixing speed and mixing time affect the characteristics of amalgam, results in cohesive ball of velvety, shiny amalgam
what is the liquid and what is the powder when mixing amalgam with mercury
mercury is the liquid, amalgam is the powder
if over triturated what will happen
the amalgam will be hot, crumbly, quick setting, but properties are not affects as much as undertrition
what is needed to decrease voids between amalgam layers, thus improving all properties, and decreasing corrosion
burnishing the amgalm, immediately after carving improves ___by reducing ____ ____
too much mercurty will exhibit increased___,___and ___
increased setting expansion, increased corrosion, and increased creep
tbhis occurs during condensation results in udnersirable delayed expansion of amalgam since zince and water yileds hydrogen gas
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