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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?
Models created form impressions are what type of reproduction?
What is the most commonly used irreversible hydrocolloid?
What is used to make custom trays?
Self-curing acrylic resin
Who takes final impressions?
What type of impression do you use for a custom tray?
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?
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?
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?
How can/do you mix elastomeric imporession material?
mixing unit system
What elastomeric material has the BEST dimensional stability?
What elastomeric material hast the BEST occlusal bite registration?
Zinc Oxide- Eugenol Bite Registration Paste