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Flashcards in Test 3 Deck (21):
1

Alginate is what kind of hydrocolloid?

irreversible hydrocolloid.

2

What are alginate impressions used for?

Study casts-stone.
Orthodontic casts-plaster.
Custom tray fabrication.
Legal records/forensics.
Mass disaster ID.
Mouthguard fabrication.

3

What is the main ingredient in alginate?

Sea/marine kelp.

4

What are aglinate particles comprised of?

Salts of alginic acid.
An activator.
A retarder.
A filler to reduce stickiness.
Flavoring.

5

What are aglinate particles comprised of?

Salts of alginic acid.
An activator.
A retarder.
A filler to reduce stickiness.
Flavoring.

6

What is the composition of alginate?

Potassium alginate (15%) - thickening agent.
Calcium sulfate (16%) - forms gel.
Trisodium phosphate (2%) - slows reaction.
Diatomaceous earth (60%) - adds bulk.
Zinc oxide (4%) - bulk material.
Potassium titanium fluoride (3%).

7

What is the composition of alginate?

Potassium alginate (15%) - thickening agent.
Calcium sulfate (16%) - forms gel.
Trisodium phosphate (2%) - slows reaction.
Diatomaceous earth (60%) - adds bulk.
Zinc oxide (4%) - bulk material.
Potassium titanium fluoride (3%).

8

What are considerations for alginate impressions?

Temp of water alters setting time.
Portions alter strength.
Humidity affects
H2O amount and temp.
Pour within 20 mins.
Max/mand tori, deep vault, deep vestibule.

9

What are considerations for alginate impressions?

Temp of water alters setting time.
Portions alter strength.
Humidity affects
H2O amount and temp.
Pour within 20 mins.
Max/mand tori, deep vault, deep vestibule.

10

What are the physical phases of alginate?

First phase = sol, material is in liquid or semi-liquid form.
Second phase = gel, material is semisolid, gelatin.

11

What preprocedural rinse is best for alginate impressions?

Astringent is best because it:
Reduces air bubbles, mucous, food particles, bacterial load.

12

What preprocedural rinse is best for alginate impressions?

Astringent is best because it:
Reduces air bubbles, mucous, food particles, bacterial load.

13

How do you decide which tray to use?

Clears all tissues by 4mm, long enough to cover retromolar pads or tuberosity, do no overly depress any of the frenum, comfortable.

14

How do you decide which tray to use?

Clears all tissues by 4mm, long enough to cover retromolar pads or tuberosity, do no overly depress any of the frenum, comfortable.

15

How do you remove maxilla tray?

Break seal along one buccal vestibule and remove by easing out one side at a time.

16

How do you remove maxilla tray?

Break seal along one buccal vestibule and remove by easing out one side at a time.

17

How do you remove mandibular tray?

"snap" to break seal and ease out one side at a time.

18

How do you remove mandibular tray?

"snap" to break seal and ease out one side at a time.

19

Alginate impression considerations:

Premedication.
Allergy to material.
Max/mand torus.
Deep palatal vault.
Claustrophobia.
Breathing difficulties.

20

Alginate impression considerations:

Premedication.
Allergy to material.
Max/mand torus.
Deep palatal vault.
Claustrophobia.
Breathing difficulties.

21

What are 'standards of practice'?

Standards are intended to guide the professional judgment and actions of dental hygienists and inspire self-reflection and continuous professional development.