The centric relationship of the upper and lower arches is recorded in the ____ ____________.
bite registration
A smooth impression tray is coated with a(n) ____________ before the final impression material is placed in the tray.
adhesive
To avoid air bubbles in a final impression, the heavy body material is extruded. What must be done with the tip?
the tip must be kept in the material until the tray is full
Polysiloxane is a type of ____________ silicone impression material.
addition
What is a vacuum former used to create?
bleaching tray, custom tray, and mouth guard
In the __________ bite registration technique, the patient is instructed to close his or her teeth together before the impression material is placed.
closed
Gloves must be worn when handling:
a) laboratory cases
b) preliminary impressions
c) final impressions
d) all of the above
d
In a two-step impression technique, before seating the heavy body impression material, the syringe-type material is ______ ______ ___ _____.
placed around the tooth
An impression tray with a smooth surface must be _______ ____ __ ________ _________ before use.
painted with an adhesive substance
When an extruder is used, where does the impression material mix?
as it moves through the mixing tip
What is created to prevent a custom tray from seating too far on the arch?
stops
When mixing an alginate product, the warmer the water is, the ______ the set will be.
faster
When mixing an alginate product, the cooler the water is, the ______ the set will be.
slower
What is the powder-to-water ratio for a maxillary alginate impression?
3:3
What is the working time of a normal-set alginate?
2 minutes
What is the setting time of a normal-set alginate?
4 minutes
What is the working time of a fast-set alginate?
1 1/4 minute
What is the setting time of a fast-set alginate?
2 minutes
An alginate impression is left sitting in water for two hours. What changes have occurred in the impression?
swelling
An alginate impression is left exposed for two hours. What changes have occurred in the impression?
shrinkage
In terms of a final impression, wash is a term used to describe the _______-____ ________.
syringe-type material
What gloves must be worn when kneading silicone putty for an impression?
vinyl
The final cure of an elastomeric impression material can occur within __ _______.
1-24 hours
Which impression material has a very strong odor and will permanently stain clothing?
polysulfide
The tubes of catalyst and base are interchangeable if they are the same ____ of impression material.
type
Which classification of impression provides the most accurate representation of the teeth?
final impression
Which mixing system uses an extruder to mix and dispense the elastomeric impression?
automix
What is the condition that allows shrinkage and distortion of an alginate impression due to leaving the impression exposed to open air?
syneresis
What is the condition that allows the swelling and distortion of an alginate impression due to leaving the impression exposed to water?
imbibition
Which type of impression tray is designed to create a mechanical lock to hold the impression material in place?
perforated tray
Which impression tray is recommended for taking impressions of the anterior portion of an arch?
section tray
Which material is one of the most used materials for bite registration?
polyvinyl paste
What is the term used to describe a condition that transforms a substance from sol state to gel state?
hysteresis
What is the working condition of a polysulfide elastomeric material?
longer mixing/setting time
What is the purpose of trisodium phosphate in the composition of alginate?
slows down reaction time
How is a reversible hydrocolloid loaded into an impression tray?
plastic tube
Which mixing system provides a material with higher consistency and insertion force?
putty