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MCPHS Dental Materials Final Exam (all crossword vocab) Questions With Answers Graded A+ Assured Success $7.99
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MCPHS Dental Materials Final Exam (all crossword vocab) Questions With Answers Graded A+ Assured Success
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setting expansion - the slight swelling of the gypsum while it is getting hard, crystals push against each other creating porosities study model cast - is a positive reproduction of both maxillary and mandibular, is a positive reproduction of the hard & soft tissues of the oral cavity sodium ph...

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  • August 27, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • MCPHS Dental Materials
  • MCPHS Dental Materials

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MCPHS Dental Materials Final Exam (all
crossword vocab)
setting expansion - the slight swelling of the gypsum while it is getting hard, crystals push against
each other creating porosities



study model cast - is a positive reproduction of both maxillary and mandibular, is a positive
reproduction of the hard & soft tissues of the oral cavity



sodium phosphate - common additive to alginate that acts as a retarder to slow down working
time



hygroscopic expansion - if the gypsum becomes immersed into water or comes in contact with
water while setting the gypsum will take-up additional water; swells



calcination - The process whereby water is lost when gypsum is heated during manufacturing

condensation silicone - impression material that is very hydrophobic, must be poured
immediately, usually has many voids



wet strength - from start of pour to one hour after, water still present



one minute - mixing time for alginate



calcium sulfate dihydrate - main component of gypsum, still contains water content



2-3 minutes - setting time of alginate



.- .

, final setting time - from start of mix to rigid mass that can be separated from impression,
minimum 1-hour/safe to separate, not fully set



10 minutes - disinfection time of alginate impression



syneresis - Water exudes causing the impression contracts



positive reproduction - study model/cast of oral structures



hysteresis - melting point much higher than boiling point, and gelling at mouth temperature



dry strength - reached in 24-hours, water has evaporated , 2X as great as wet strength



diatomaceous earth - silica, inert filler used in alginate; Gives the material 'body'



reversible hydrocolloid - impression material used for crowns, requires special equipment, water
cooled trays, can be softened and reused



exothermic reaction - gives off heat as it set or gets hard



Gilmore needle - device used to determine setting time of gypsum



Hydration - When mixed with water, the hemihydrate is converted back to dihydrate



polysulfide material - rubber base impression material, used for dentures, special spatula, long
working time 4-6 minutes



imbibition - Water may be absorbed causing the impression to swell

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