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ch 46 impression materials
Terms in this set (62)
gelatin type material derived from seaweed
irreversible hydrocolloid material used for taking preliminary impressions
foundation or basic ingredient of a material
process of using finger pressure to contour a closer adaptation of the margins of an impression while still in the mouth
substance that modifies or increases the rate of a chemical reaction
having an object centered, such as maxillary teeth centered over mandibular teeth in correct relation
a suspension of particles in a dispersion medium such as water, its two phases are sol and gel
material having elastic properties from rubber
a change in temperature that causes the reversible hydrocolloid material to transform from one physical state to another
absorption of water, causing an object to swell
reproduction of a patient's bite with the use of wax or elastomeric material
loss of water, causing something to shrink
bringing a material to a desired consistency
physical property of a fluid related to resistance to flow
Is an impression a negative or a positive reproduction?
preliminary, final and occlusal (bite registration)
Of the three classifications of impressions, which can the EFDA legally take?
Which of the three classifications of impressions is used for occlusal relationships?
Which type of impression tray covers half the arch?
perforated surface tray
Which type of tray allows impression material to lock on mechanically?
plastic perforated tray, bite tray and triple tray
Which type of impression tray is used most often for taking final impressions?
adding utility wax to the border of the tray
What is used to extend the length of a tray?
What is the organic substance within hydrocolloid materials?
ease in seating the impression tray, working with help, severe gag reflex
Why would you select a fast-set alginate over a normal-set alginate?
3 scoops water to 3 measures of water
What is the water-to-powder ratio for taking a maxillary impression?
What does the prefix "hydro-" mean
What is another name for irreversible hydrocolloid?
rubber mixing bowl
Do you mix irreversible hydrocolloid on a paper pad or in a mixing bowl?
Before an impression is taken with reversible hydrocolloid, where is the material kept?
Is an elastomeric material used for preliminary impressions or final impressions?
light-bodied, medium-bodied and heavy-bodied
In which three ways are elastomeric materials supplied?
light-bodied and then heavy bodied
What material does the dentist first apply to the teeth - the heavy-bodied or the light-bodied?
What is another term for polysulfide?
syringe or extruder
How is light-bodied material placed around a prepared tooth?
What system completes the mixing of final impression material for you?
What material is used most often for a bite registration?
What type of tray is used when ZOE bite registration paste is applied?
Do you cool or warm the wax before placing the tray in the patient's mouth for a bite registration?
bite registration and occlusal registration
The centric relationship of the upper and lower arches is recorded in the ____.
A smooth impression tray is coated with a(n) ____________ before the final impression material is placed in the tray.
In terms of a final impression, wash is a term used to describe the ___.
keeping the tip in the material, To avoid air bubbles in a final impression, the heavy body material is ___.
The gloves that must be worn when kneading silicone putty for an impression are ___.
Polysiloxane is a type of ____________ silicone impression material.
In the __________ bite registration technique, the patient is instructed to close his or her teeth together before the impression material is placed.
preliminary impressions; final impressions
laboratory cases, Gloves must be worn when handling ___,
the syringe-type material is placed around the tooth
In a two-step impression technique, before seating the heavy body impression material, ___.
painted with an adhesive substance
An impression tray with a smooth surface must be _________________ before use.
within 15 minutes
The final cure of an elastomeric impression material can occur ___.
as it moves through the mixing tip
When an extruder is used, the impression material is mixed ___.
the same type of impression material
The tubes of catalyst and base are interchangeable if they are ___.
The impression material that has a very strong odor and will permanently stain clothing is ___.
To prevent a custom tray from seating too far on the arch, _______ are created.
When mixing an alginate product, the warmer the water is, the ______ the set will be.
A maxillary alginate impression usually requires ____ scoops of powder and three measures of water.
Normal-set alginate has a working time of ___.
If stored in water, an alginate impression ___.
Give the three types of impressions taken in a dental office.
Describe the types of impression trays and their characteristics of use.
Discuss hydrocolloid impression materials and their uses, mixing techniques, and application.
Discuss elastomeric impression materials and their uses, mixing techniques, and application.
Explain the importance of an occlusal registration and describe its use in a procedure.
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