Taking the primary impressions

Question 1

What is the retromolar pad and what is the pear shaped pad?

Answer 1

Question 2

What areas need to be captured in the mandibular impression? - buccal side

Answer 2

retromolar pad

pear shaped pad

buccal shelf

frenum attachments

Question 3

What areas need to be captured in the mandibular impression? - lingual side

Answer 3

Full depth of the sulcus to the floor of the mouth

capturing the mylohyoid ridges

lingual frenum attachment

Question 4

What is the lingual frenum attachment?

Answer 4

connects the tongue to FOM

Question 5

MYLOHYOID RIDGE?

Answer 5

Question 6

What are the important features to capture in the maxillary arch impression?

Answer 6

post amp area - from hamular notch to hamular notch

Should extend forward to the midline fovea

distobuccal folds behind last standing molars

rugae

Question 7

What is the point of perforations in plastic trays?

Answer 7

retention of material

Question 8

What do metal trays have to allow retention of material?

Answer 8

rim lock undercut periphery

Question 9

What do you want the mandibular and maxillary trays to avoid hitting at the bad?

Answer 9

mandibular impression = don’t want tray to hit ramus

maxillary impression = coronoid process

Question 10

Do you get the pt to move their mandible when taking maxillary impressions?

Answer 10

yes

left to right

capture where the coronoid process is coming in

Question 11

What do place on the plastic tray before impression material added?

Answer 11

impression tray adhesive

Question 12

What is being mixed for impressions here?

Answer 12

silicon putty

Question 13

When you are taking a lower impression, do you get the pt to move their tongue?

Answer 13

yes…

up, down, left , right and forwards

Question 14

The dentulous areas have not had any silicon putty, why is this?

Answer 14

shows muscle attachments

allow the saddle areas to better support a denture base under functional load

Question 15

Is any more silicon putty added after this has been taken?

Answer 15

yes, add more silicon putty

sulcus depth, muscle attachments and free end saddle during natural mouth movements

fully capture all the surrounding anatomy

Question 16

What is being cut away here?

Answer 16

areas with undercuts

would interfere with taking impression of hard tissue areas

Question 17

When you have your silicon putty trimmed and muscle attachments etc have been captured, what do you do next?

Answer 17

apply alginate

take impression

Question 18

What are the stages after taking the impression?

Answer 18

rinse

disinfect and wrap in damp paper towel

prescribe for lab to cast up and articulate

Question 19

What other information do you send to the lab along with the impression?

Answer 19

wax registration paste

wax squash bite

If you do not have posterior teeth (as shown) lab will need to make light cured acrylic based bite registration blocks

you will then use them to register pts bite