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DASLE Minnesota--Retake Exam Questions and Answers
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DASLE Minnesota--Retake Exam Questions and Answers
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DASLE Minnesota--Retake ExamQuestions and Answers
Why and where is it necessary to add wax (wax trimming) to an alginate tray? (4)
-Protects tissue from injury and provides comfort
-Extents length of tray
-Adds to palate (pt with high palatal vault)
-Extends borders to aid in obtaining bu muscle attachments
What type of wax is used for wax trimming?
Utility wax
What is the correct operator position when taking MX and MN impressions?
MX: Right handed-11-12. Left handed-12-1
MN: Right handed-7:30-8. Left handed-4:30-5
Why is the patient instructed to lift and extrude their tongue when taking a MN
impression?
Ensures lingual aspect of alveolar process (lingual flange) is defined
What types of trays/trays are used furing alginate impression and why? (2)
Rimlock and/or perforated
-Locks the alginate material into the tray
How is the setting time of alginate lengthened? Shortened?
Lengthened- Using colder water
Shortened- Using warm water
,Why is mouthwash used in an alginate impression? (4)
-Remove food debris
-Help prevent air bubbles
-Cuts the viscosity of saliva
-Helps prevent gagging on MX impression
How many increments of powder are used in a MN impression and how do you
load the tray?
2 scoops, from each lingual side
How many increments of powder are used in a MX impression and how do you
load the tray?
3 scoops, one swipe on the posterior but bring most anterior
What is imbibition?
Uptake of water in an alginate impression. Swells
What is syneresis?
Loss of water in an alginate impression. Shrinks
How is an alginate tray seated?
Posterior to anterior
Which alginate impression is taken first and why?
MN- Less gagging
How should an alginate impression be stored if it cannot be poured up
immediately?
Wrapped in slightly moist paper towel
What is muscle trimming called on an edentulous patient?
Border molding
, How should an impression be removed from the mouth?
With a snap
What is the purpose of taking bite registration/intraocclussal record? (3)
-Record alignment of the teeth
-Relate the MX and MN casts correctly
-Places between the casts during trimming and storage
List materials that can be used to obtain the bite registration: (4)
-Base plate wax
-U shaped wax (bite wafer)
-Polysiloxane paste (gun dispensed)
-ZOE paste
Ingredients in alginate: (5)
-Potassium alginate- Seaweed
-Calcium sulfate- Forms gel
-Trisodium phosphate- Slows reaction
-Zinc oxide
-Potassium titanium fluoride
Structures in MX and MN impressions
Ex:
-Lingual frenum- Both
-Rugae- MX
-Tuberocity- MX
-Retromalr pad- MN
Describe the motion/pressure when performing a mechanical polish
-Short, overlapping, intermittent, wiping and lifting motion (no scrubbing)
-Work from gingiva to occlisal
-Cup flares
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