Dental Materials Lab Midterm
Common uses of alginate impressions - correct answer ✔-diagnostic casts -
study models
-preliminary impressions for complete dentures
-partial denture frameworks
-opposing casts for crown and bridge treatments
-repairs of partial and complete dentures
-provisional restorations
-custom trays for fluoride or whitening
-sport protectors and night guards
Dental hygiene purposes and uses of study casts - correct answer ✔-serves
as a permanent record of patient's present condition
-give sharper delineation to and corroboration of the observations made
during the oral exam
-an effective visual aid to use when oral conditions are explained and dental
hygiene care plans are presented to patients
-observe normal conditions and the variations of and departure from normal at
the onset of treatment
-during peridontal charting to record anatomic features such as size,
position,and shape of gingiva and interdental papillae and positions of frena
-forensics
What type of impression materials are available? - correct answer ✔Rigid
and Elastic
, Within these categories, these materials are further classified as - correct
answer ✔reversible and irreversible
What is alginate? - correct answer ✔Alginate is an Elastic Irreversible
Impression Material
A negative replica of hard and soft tissues of the mouth into which plaster will
be poured to construct a positive replica - correct answer ✔impression
What are positive replicas used for? - correct answer ✔study model, working
model, or die
replica of an individual tooth or several teeth - correct answer ✔die
Armamentarium needed for alginate - correct answer ✔2 small bowls
alginate spatula (flexible)
water measure
one can alginate
plastic trays (max and man)
utlity wax to apply to the tray rims and one
bite registration wax
large bowl with warm water to soften the bite wax
lab knife
tray adhesive
What to consider when placing tray over teeth to check for size - correct
answer ✔-does it allow space on all sides of teeth or impinging on teeth?
-does it extend far enough to include tretromolar pad or max tuberosity?
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