Pros - impressions

Question 1

What can impression materials be split into

Answer 1

elastic

non elastic

Question 2

What are the features of elastic materials

Answer 2

can record undercuts

can be used in dentate, partially dentate and edentulous patients

Question 3

What are non elastic (rigid) materials used for

Answer 3

edentulous patients

cannot record undercuts

Question 4

What are the 2 types of elastic materials

Answer 4

hydrocolloid

sythentic elastomers

Question 5

What are the 2 hydrocolloids

Answer 5

agar

alginate

Question 6

What are the 3 types of synthetic elastomers

Answer 6

polysulphides
silicones
polyethers

Question 7

What are the 3 types of non elastic materials

Answer 7

impression plaster
impression compound
ZOE

Question 8

What are the different types of impression trays

Answer 8

edentulous metal perforated 
edentulous plastic perforated
dentate metal perforated 
dentate plastic perforated
universal sectional 
custom/special tray

Question 9

What are features of edentulous metal perforated impression trays

Answer 9

For use with edentulous patients
Autoclavable
Available in different sizes
Not easily adaptable
Non perforated also available 
May have separate metal handle - also autoclavable

Question 10

What are edentulous plastic perforated impression trays

Answer 10

Edentulous patients
Single use
Available in different sizes
Easily adaptable

Question 11

What are dentate metal perforated impression trays

Answer 11

Dentate patients
Autoclavable
Different sizes available
Not easily adapted
Available in perforated and non-perforated

Question 12

What are dentate plastic perforated impression trays

Answer 12

Dentate patients
Single use
Available in different sizes 
Easily adapted using impression compound
Available in perforated and non perforated

Question 13

What are universal sectional impression trays

Answer 13

Dentate patients
Used for impression trays in specific areas of mouth
Perforated and non perforated
Easily adapted bc made in flexible metal

Question 14

What are custom/special tray

Answer 14

Fabricated on plaster model

Fabricated from acrylic

Question 15

What are modifications we can make to master impressions to help

Answer 15

Can add greenstick/silicone or wax to outside periphery of trays to aid in border moulding
Can create stops to space prescribed in canine and post dam region (upper) or retromolar pad and ridge in the canine areas (lower) to allow for space for the impression material