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Related Flashcards
Related Topics
Cards In This Set
| Front | Back |
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Model
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A study model that replicates the teeth
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Cast
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A working model that is more than one tooth
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Die
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Woring model of a tooth or few teeth
strongest used for crowns/bridges
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Syneresis
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Formation of exudates on the surface of a gel
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Inbibition
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Absorbs addtional water
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Thermoplastic
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A plastic that softens upon heating and then rehardens in cooling (reversible)
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3 reasons custom mouthguards are preferred/
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Dec gagging
lack of taste and color
low speech impairment
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Purpose of NaPO4 in alginate
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Controls set time
Retarder to inc working time
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Two ex of elastic non aqueous material
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Polysulfide and polyether rubber imp material
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How can setting time be controlled by operator?
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Inc temp of water or environ dec working time
water/powder ratio
accelerator/potassium sulfate dec setting time
retarder/sodium citrate inc setting time
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How is plaster made from raw gypsum material?
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Gypsum is heated in atmospheric pressure and beta hemihydrate is formed
gyspsum is heated under steam pressure and alpha hemihydrate is formed
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Wet strength
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Free water not evaportate
not 24 hrs
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Dry strenght
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Free water evaportate
24 hrs
two times stronger than wet strenght
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How should a mouth protector be stored when not in use?
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In distilled water in a rigid container or mounted on the model it was fabricated from
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Hydrophilic
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Water loving
surface readily wettable
ex: polysulfide rubber imp material
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