01a: TA Mini lecture on Alginate Impressions

Question 1

Why make impressions and models?

Answer 1

Study tool for tx planning
Diagnostic Wax Ups
Make Appliances
  Occlusal Guards, Bleaching Trays, etc
Educational Tool for Patients

Question 2

What are some criteria for the maxillary impression

Answer 2

Hamular Notches

Doesn’t Impinge on Pharyngeal Folds

Question 3

What are some criteria for the mandibular impression

Answer 3

Retromolar Pads

Not on ramus of mandible

Question 4

What should you try to do while loading mandibular tray?

Answer 4

Scrape spatula down tongue side

Level off material with sides of tray

Question 5

What should you put on the teeth before seating the tray?

Answer 5

Rub alginate on occlusal surfaces of teeth

Question 6

What part of the tray do you seat first?

Answer 6

Posterior

Question 7

Where do you stand for a mandibular impression?

Answer 7

In front of patient

Question 8

What is a common problem with maxillary impressions?

Answer 8

Gagging

Question 9

What are some ways to minimize gagging?

Answer 9

Take Mx impression after mandibular
Seat from back to front
Have patient sit up, then tilt chin down
Pt breathes thru nose
Don't overload tray
Distract patient

Question 10

What color should the impression have?

Answer 10

Uniform shiny color with smooth texture

Question 11

What are the general criteria for impressions?

Answer 11

All teeth and tissues w/o over or under extensions
No show through in tooth area
No soft tissue perforations
Material is attached to the tray