Impressions
How are impressions removed from the mouth?
What is One quick motion
A shelf life of Alginate is between 18-24 months.
True or False
What is False
How far must a tray extend beyond the distal portion of most posterior tooth?
What is 2-3mm
A positive reproduction is what ?
What is the dental model
How is an alginate impression disinfected?
What is spray with disinfectant
Impressions can be disinfected in the lab.
True or False
What is False- they need to be disinfected prior to leaving treatment area
What are preliminary impressions used for?
What is dental/diagnostic models
When seating the Maxillary tray , which portion should be seated first?
What is the posterior
What is used to describe the change in temperature that causes reversible hydrocolloid material to transform from one physical state to another?
What is hysteresis
___________ is the most widely used material for preliminary impressions.
What is alginate
How long can you wait to pour before impression becomes distorted?
What is 1 hour
Will warm water make alginate set faster or slower?
What is faster
What type of tray covers the anterior portion of dental arch?
Reversible Hydrocolloid is ___ water and ____ agar.
What is 85 % and 13 %
A EFDA can take Final Impressions True or False
What is False
What is the term for when an impression soaks up water?
What is inbibition
What does HydroColloid mean ?
What is water and gel like
How long after your spray tray adhesive can you place impression material?
What is 15 minutes
Name the 3 compartments used to heat reversible hydrocolloid material to the correct temperature
What is conditioner bath, tempering bath and storage bath
Name 3 types of classifications of impressions used in dentistry
What is Preliminary, final and occlusal
What is an impression material that is used when an accurate final impression is needed?
What is Elastometric
A negative reproduction is what impression?
What is preliminary
What kind of tray is made for a specific patient?
What is custom tray
Irreversible hydrocolloid impression material cannot be returned to the ______ after they become a ____.
What is Sol and gel state
__________ is when water evaporates from the impression.
What is syneresis