Quiz #6: Alignate Impression

Place the steps of alginate impressions in the correct order:

Step 1:
Step 2:

Step 3:

Step 4:

Step 5:

 

1. Explain the procedure to the patient

2. Place the water in the bowl

3. Place the alginate powder in the bowl

4. Complete the mandibular impression

5. Complete the maxillary impression

Match the amount of time with the procedure or setting time for gypsum and alginate.

 

1 minute

 

Mixing time for alginate

3-4 minutes

 

Setting time for regular set alginate

5-7 minutes

 

Initial setting time for gypsum

30-45 minutes

 

Final setting time for gypsum

Which of the following is a not a characteristic associated with alginate impression material?

 

Hydrocolloid

 

Elastomeric

 

Polyethylene

 

Irreversible

Polyethylene

You forget to wrap your alginate impression with a damp paper towel and do not have the chance to pour it in stone for two hours.  What will happen and what is the term for this?

 

Nothing, this will not affect alginate

 

Shrink, Syneresis

 

Return to its sol state, ungelify

 

Expand, Inbibition

Shrink, Syneresis

After taking an alginate impression, you see that the anterior teeth have "perforated", you can see the metal of the tray on the facials of those teeth. What positioning error caused this to occur?

 

Tray was positioned too far anterior

 

Tray was positioned too far posterior

 

Not enough material in the tray

 

Tray was removed from the mouth too fast

Tray was positioned too far posterior

Dental hygienists in Ohio can take alginate impressions to create whitening trays and mouthguards.  Ohio dental hygienists can take impressions for all restorative procedures, including final impressions for prosthetics.

 

Both statements are true

 

The first statement is true, second statement is false

 

Both statements are false

 

The first statement is false, second statement is true

The first statement is true, second statement is false

You were not paying close attention when adding water to your stone and added a larger and colder amount of water than you intended to.  How will this affect the mix?

 

Stronger and faster setting time

 

Weaker and slower setting time

 

Stronger and slower setting time

 

Weaker and faster setting time

Weaker and slower setting time

Hand mixing stone with a circular whipping motion and not using a vibrating machine during mixing can result in what error?

 

Slow setting time

 

Inaccurate powder to water ratio

 

Shrinkage

 

Voids

Voids