24.
Complete information related to impression materials.
a. An impression is a _________ reproduction of a given area of the oral cavity.
b. Impression material must be inserted into the mouth while it is too ________
to retain its ________________ .
c.
___________ ___________ carry the impression material to the mouth and
provide a _____________ base to hold it against the tissues until it hardens.
d. Stock trays may be ___________________ for each individual patient.
25.
Describe some requirements for impression material.
a. Impression material should ___________ or be ____________ at a
temperature that will not injure the oral tissue.
b. Impression material should set within _____ to_____ minutes, at body
temperature.
c.
It must retain an accurate ______________________ when it solidifies and is
withdrawn from the mouth.
d. After solidifying, it must not _________________ when trimmed withh a sharp
knife at room temperature.
26.
Which type of impression material softens when warmed and hardens when
cooled, with no change in chemical makeup?
a. Rigid.
b. Elastic.
c.
Thermoplastic.
MD0502
3-18