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48 Cards in this Set
- Front
- Back
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Impression Material |
Used to make replicas of teeth and tissues |
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Study model |
Used in diagnostic and treatment planning cast |
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Cast |
Used in prep of restorations |
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Die |
Replica of single tooth |
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Types of impression systems |
Powder to water Paste to paste Heated |
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Impression Trays |
Used to carry impresión materials Plastic disposable Metal trays that are sterilized |
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Stock trays |
Generic trays that comes in a range of sizes Plastic or metal |
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Custom trays |
Made on a model of patients teeth. Two impressions are needed. |
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Special use trays |
Bite registration tray Triple tray |
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Bite registration tray |
Record occlusal surface of both arches. |
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Triple tray |
Records impresión of prepared tooth, opposing teeth and a bite registration. |
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Chemical reaction |
Form elastic rubber materials are THERMOSET |
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Physical change |
Change when cooled by SOLIDIFICATION or GELATION. THERMOPLASTIC |
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Elastic Impression Materials |
Soft and pliable set impressions |
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Inelastic impression material |
Set hard and rigid Used on edentulous patients (no teeth) |
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Viscosity |
Ability to flow |
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Viscosity options |
Light body Medium body Monophase Heavy body Putty materials |
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types of Inelastic impression materials |
Plaster Wax and impresión compound Zinc oxide Eugenol (ZOE) |
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Types of Aqueous elastomeric impresión materials |
Alginate(irreversible hydrocolloid) Agar (reversible hydrocolloid) |
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Types of Nonaqueous elastomeric impression materials |
Polysulfides Condensation silicones Polyethers Additional silicones |
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Plaster |
Not popular. |
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Wax |
1st impression material used Cheap and clean Some hard or dohy Thermoplastic |
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Impression compound |
Wax with added filler to improve stability |
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Zinc oxide Eugenol (ZOE) |
Paste to Paste Smells and taste like cloves Sets to hard and brittle so only used for edentulous patients |
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Sol state |
State of solution when one material is dissolved into the other |
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Gel state |
When the solution Hardens into a rubbery state |
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Irreversible hydrocolloid |
Set via chemical reaction Alginate Won’t reverse back |
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Reversible hydrocolloid |
Will go back to fluid (sol) through heating. Agar or agar agar |
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Alginate |
Irreversible hydrocolloid Powder to water Not super accurate but easy to use |
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Syneresis |
When hydrocolloid materials contract and exude water |
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Inhibition |
Absorbing water and swelling |
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Agar reversible hydrocolloid |
Premixed Required special equipment to heat, store and temper materials. HYDROCOLLOID CONDOTIONER Inexpensive and very actuate but the requirements limit use |
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Hysteresis |
Melting and gelling at different temps |
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Nonaqueous elastomeric impresión materials |
Polysulfides Condensation silicones Poly ethers Additional silicones |
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Polysulfides impression material |
1st rubber material Two pastes mixed in equal lengths
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Perforations |
Holes that allow alginate to flow through when seated |
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Proper tray selection |
Large enough to extend past posterior teeth, include all anterior teeth. 2/3 mm around facial and lingual sides, be comfy, |
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Adding wax to tray |
Add rope wax to edges of tray to protect tissues from irritation |
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Prepping patient |
Explain procedure Guard against spills Minimize gagging-breathe thru nose, avoid tongue, Take out removable things Rinse with mouth wash Mand then max |
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Setting time for normal set |
3-4 min |
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Setting time for normal set |
3-4 min |
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Setting time for fast set |
1-2mjnute |
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Working time |
1 minute |
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Steps of mixing alginate impression |
Fluff 3 scoops for max 3 lines of water for max 2scoops for mand. 2 lines of water for mand. Gently stir Spatulate hard
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Steps of mixing alginate impression |
Fluff 3 scoops for max 3 lines of water for max 2scoops for mand. 2 lines of water for mand. Gently stir Spatulate hard
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Steps of filling trays for alginate impression |
Mand tray: load from facial aspect of tray. Press out air pockets. Max tray:load from posterior aspect. Press ou air pockets Smooth with wet finger |
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Seating the alginate impression |
Insert at an angle Straighten so handle is inline with midline Press down evenly Help to not choke Pull lip out |
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Disinfecting the impression |
Rinse with cool water Spray with disinfectant Place in bag Wait for disinfectant time Rinse again |
