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When should Alginate impressions be poured?
In Preliminary Impressions
What does imbibition mean?
Absorption of water, causing an object to swell.
eg. alginate impression stored in water or soaked in paper towel
Impressions are what type of reproduction of the teeth and sorrounding tissues?
negative reproduction
Models created form impressions are what type of reproduction?
positive reproduction
What is the most commonly used irreversible hydrocolloid?
Alginate
What is used to make custom trays?
Self-curing acrylic resin
light-cured resin
thermoplastic material
Who takes final impressions?
dentist
What type of impression do you use for a custom tray?
Preliminary Impression
How deep should the ipression tray be to allow enough material between the tray and incisal edges of the teeth?
sufficiently deep to allow 2 to 3mm of material
What are the three classifications of impressions in dentistry?
Preliminary Impression- create production of teeth & sorrounding tissues.
Final Impression- Most accurate reproduction of teeth & sorrounding tissues.
Bite Registration- Produce reproduction of occlusal relationship of the maxillary & mandibular teeth when mouth is occlused.
What type of tray covers 1/2 of the dental arch?
Quadrant tray
How do you extend the lenght or depth of an impression tray?
Add utility wax to the border of the tray
What is used to produce the occlusal relationship of the upper and lower arches?
Bite registration
What can you do to change the setting time of an Alginate impression?
use cooler water to lengthen setting time.
use warm water to shorten setting time.
For an EXTREMELY accurate final impression you would use?
Polyether- elastomeric material used to easy remove impression
What impression material has the highest viscosity?
Polysiloxane
How can/do you mix elastomeric imporession material?
Paste system
Automix system
mixing unit system
Putty system
What elastomeric material has the BEST dimensional stability?
silicone
What elastomeric material hast the BEST occlusal bite registration?
Zinc Oxide- Eugenol Bite Registration Paste
Author
karlap
ID
105774
Card Set
Ch46
Description
Ch46
Updated
2011-10-03T04:09:04Z
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