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Alginate Impression Materials
Terms in this set (16)
Uses of alginate imp materials?
-Bleach tray imp
-Preliminary imp for partial/immediate full dentures
-Imp for temporaries
-Preliminary imp for custom trays
When should you NOT use alginate?
-Colloid: suspension of molecules in a dispersed medium
-Hydrocolloid: dispersing medium in water
-Sol-liquid colloid: solution of one material dissolved in another
-Gel-rubbery, gelatinous colloid
What are the ingredients of alginate?
Calcium sulfate - accelarator
Trisodium phosphate - retardant
Diatomaceous earch - adds stiffness and strength
Zinc oxide - filler
Potassium titanium fluoride - gives smooth surface
What are the factors affecting reaction?
When taking maxillary impressions, the operator should stand _____ the patient, when taking mandibular impresions, the operator should stand _____ the patient. Which arch should you take first?
In front of
What are some factors of tray selection?
Tray clearance - at least 1/8" on buccal or lingual of teeth
Max - tray extending onto tuberosity
Mand - tray extends onto retromolar pads
Flanges - extend into vestibule w/o digging in or pinching
What is the function of periphery wax?
Added when vestibules are deep or for comfort
Keeps material from going down throat
Touches palate to form a barrier
_____ scoops for lower, _____ scoops for adult upper, _____ for half tray.
What are some things that affect alginate?
Powder-packed vs fluffed
Factors affected by improper mixing?
Type I fast-set: _____
Type II regular-set: _____
1 min 45 sec
2 min 15 sec
Syneresis vs Imbibition
Losing water by evaporation
Absorption of water
Common problems with alginate?
Water too warm
Moving tray in mouth during gelation
Failure to pour immediately after disinfection
What is the goal of disinfection (of alginate/imp materials)?
To prevent cross contamination
Powder to water or water to powder?
ADD POWDER TO WATER
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