chapters 8 and 30 quiz questions materials

To avoid cross contamination of putty material you should A. Use the designated scoops from each jar B. Wash scoops with soap and water before using in a second jar C. Use a new disposable scoop for each jar D. Disinfect the scoop with a caviwipe or disinfectant spray between uses.

A. Use the designated scoops from each jar

As mentioned in chapter 8 addition silicones are the most popular type of elastomeric impression material, especially for crown and bridge impressions. Which two factors make addition silicones the most popular material? a. Stability, accuracy b. Cost, viscosity c. Easy to use, strength d. None of the above

a. Stability, accuracy *

When taking impressions, the teeth and supporting structures are replicated. These supporting structures are as follows: Gingiva, alveolar bone, hard and soft palate, periodontal ligament? a. The first statement is true, second is false b. The first statement is false, second is true c. Both statements are false d. Both statements are true

a. The first statement is true, second is false

A precaution includes avoiding an accelerated set, mixing the putty material with your fingertips? a. True b. False

true

Tips for the clinician while, making impressions include all the following except A. Wear latex gloves when mixing putty B. For best results, tray and syringe materials are prepared simultaneously by two people. C. Moisture control is critical D. It is easier to wait to remove set material from a patients face than it is to remove unset materials

A. Wear latex gloves when mixing putty

what is the last step in the tray removal prosses A. disinfect B. rinse C. Throw it away D. wash it with water

A. disinfect

A Retraction cord can be treated with vasoconstrictive agent to reduce bleeding and temporarily shrink gingiva tissues. A.True B. False

A.True*

In a short answer describe the advantage of using addition silicone.

It does not need to be poured immediately after the impression is taken. *

2. Which type of special use tray records the occlusal surface of both arches? A. Bite registration trays B. Custom trays C. Stock trays D. Elastic trays

A. Bite registration trays*

The process of hydrocolloid materials contracting slightly is called A. Syneresis B. Inhibition C. Hysteresis D. Condenstation

A. Syneresis

2. Hysteresis is unlike the common phase changes of water which melts and freezes at the same temperature. A. True B. False

A. True*

How should the impression tray be removed? a. Slowly and gently so the impression doesn't tear b. Always remove it from the upper right quadrant and then the upper left quadrant shortly after. c. Slowly from the molars working your way up to the incisors. d. A quick snap motion

d. A quick snap motion*

What impression material melts at a higher temperature than boiling water? a. Irreversible hydrocolloid b. Polysulfide c. Silicone d. Agar

d. Agar

Inelastic Impression Materials include which of the following? a. Plaster b. Wax and impression compound c. Zinc oxide-eugenol d. All of the above

d. All of the above

What types of impression materials are there? a. Aqueous b. Inelastic c. Nonaqueous Elastomeric d. All the above

d. All the above*

Which of the following statements is not true in regard to impression trays? a. Stock trays are off the shelf and come in a variety of shapes, sizes, and materials to meet the needs of many mouth conditions. b. Custom trays make the least accurate impressions. c. Bite registration trays record how the occlusal surfaces come into contact. d. The triple tray records a prepared tooth, the opposing teeth, and a bite registration.

Custom trays make the least accurate impressions. Answer B Pg 114

What is the 4th step when preparing the Automix Gun? A- Load the cartridge into the gun B- Twist off the sealing cap and save the cap C- Remove the used mixing tip, and replace the cap D- Install a new mixing tip and twist it into the locked position

D- Install a new mixing tip and twist it into the locked position

Chapter 30 -after coating a plastic stock tray, how long should the tray be left to air dry so the adhesive that was applied becomes tacky? A. 5 minutes B. 8 minutes C. 30 seconds D. 10 minutes

D. 10 minutes*

What is a precaution for making impressions? A. To avoid an accelerated set, mix the putty material with your fingertips. B. Follow the manufacturer's directions regarding used tips and cartridges caps. C. Protect the patients clothing when using impression materials to prevent staining. D. All of the above.

D. All of the above. *

What is hysteresis?

*Characteristics of melting and gelling at different temperatures (page 121)

List the three types of impression materials

*Inelastic, Aqueous elastomeric and Nonaqueous elastomeric (page 116-117)

What is the role of the retraction cord?

*To push the gingiva away from the teeth. (Page 369)

Which of the following statements in true in regard to alginate setting time? a. When mixing alginate, using warmer water will increase the setting time. b. When mixing alginate, using colder water will increase the setting time. c. When mixing alginate, using warmer water will decrease the setting time. d. When mixing alginate, using colder water will decrease the setting time. e. None of the above f. A&D

Answer F - a and d Pg 120

True or false: It is only important for dental assistants to learn impressions. A dental hygienist will never have to preform or support with impressions so it is something they may skip learning.

Answer False Pg 368

True or false, moisture control is critical when mixing elastomeric impressions. a. true b. false

Answer: TRUE page 368

Why should the clinicians knead the putty material with their fingertips rather than the palms of their hands? A. To slow down the process B. To keep the putty at correct temperature C. The putty material amount is small D. The putty will dry out faster

B. To keep the putty at correct temperature*

Addition silicone impression material is generally used as a final impression material for the fabrication of crowns and bridges. A. False B. True

B. True *

1. What type of impression tray is made on a model of the patient's arch with acrylic or other resin? A. Stock trays B. Special use trays C. Custom trays

C. Custom trays*

A replica for a single tooth is a A. Study model B. Cast C. Die D. A and B

C. Die

Which is NOT a property of Alginate. A. Potassium alginate B. An inner filler such as silica C. Nitrous oxide D. Calcium sulfate

C. Nitrous oxide*

1. All of the following are Non-aqueous Elastomeric Impression Materials except: A. Polysulfide B. Polyethers C. Plaster D. Silicons

C. Plaster

The most accurate impressions are made with custom trays. Light-body materials are the most "runny" impression materials. A. The first statement is false B. The second statement is true C. The first statement is true D. The second statement is false E. A & B F. B &C

F. B &C

After the silicone impression is taken it needs to be poured immediately. True False

False*

The retraction cord is placed underneath the tongue to facilitate crown and bridge impressions. True False

False*

True or false? When preparing the putty material dispense equal volumes of the putty base and catalyst materials using the same scoop. True False

False*

In a short answer, describe what tray adhesive does.

Tray adhesive aids in retention of the impression material in the trays. *

It is easier to remove set material than it is to remove unset material True False

True*

True or false? When making a silicone impression, the material does not need to be poured immediately after the impression is taken. True False

True*

mpression materials with low viscosity are placed on and around the tissue. True or False? a. True b. false

a. *True (Page 368)

When preparing the putty material for impressions, how much putty material should be placed into the tray? a. 3 to 4 inch-long cylinder b. 50 ml c. 8 to 10 inch-long cylinder d. 12 ml

a. 3 to 4 inch-long cylinder**

Irreversible Hydrocolloids materials set via chemical reaction (it does not reverse back to the sol state) and Reversible hydrocolloids materials gel by a physical (they reverse back to the sol state when heated and then change again to the gel state when cooled). a. Both statements are true b. Both statements are false c. The first statement is true, the second statement is false. d. The first statement is false, the second statement is true.

a. Both statements are true

which trays create the most accurate impressions ? a. Custom trays b. Bite registration trays c. Stock trays

a. Custom trays

True or false. Addition silicone impressions are allowed to be taken by dental hygienists in all states. a. False b. True

a. False

When a hydrocollid impression absorbs water, swells, and distorts it is called? a. Imbibition b. Polymerization c. Syneresis d. Viscosity

a. Imbibition

is the thermal conductivity of impression compound high or low? a. Low b. High c. Varies

a. Low*

Which of the following is an inelastic impression material? a. Plaster b. Alginate c. Agar d. Polyether

a. Plaster

When preparing putty material, wearing overgloves is important because latex gloves may inhibit the setting of the material. a. The statement and the reason are correct and related b. The statement and the reason are correct but NOT related c. The statement is correct, but the reason is NOT d. Neither the statement nor the reason is correct or related

a. The statement and the reason are correct and related

For best result, tray and syringe materials are prepared simultaneously by one person. a. This statement is false b. This statement is true

a. This statement is false*

use of the automix gun eliminates hand mixing with a spatula and paper mixing pad. a. This statement is true b. This statement is false

a. This statement is true*

Impression trays are used to carry the impression material into the mouth a. True b. False

a. True

Impression materials are used to make replicas of teeth and other oral tissues. a. True b. False

a. True*

Which material for impressions was first used in Dentistry? a. Wax b. Zinc oxide-eugonal c. Plaster d. None of the above

a. Wax

True or false Impression materials are used to make replicas of teeth and other oral tissues? a. true b. false

a. true

When preparing the Automix gun which step is correct: a.Load the cartridge into the gun. b. Twist off the sealing cap and dispose. c. Dispense a dime size amount of material onto a paper towel by squeezing the handle. d. Allow approximately 10 minutes to dry.

a.Load the cartridge into the gun. *

How long should you wait after you apply a tray adhesive? a. 5 minutes b. 10 minutes c. 15 minutes d. 30 seconds

b. 10 minutes

How many people usually prepare the tray and syringe materials for the double-mix impression? a. 1 b. 2 c. 3 d. None of the above

b. 2

Impression trays are made on a model of the patient's arch and are cost-effective. Custom trays are used to carry the impression material into the mouth and are expensive but reusable. a. Both statements are true b. Both statements are false. c. First statement is true and the second statement is false. d. First statement is false and the second statement is true.

b. Both statements are false.

Out of all trays, which creates the most accurate impressions? a. Special-Use Trays b. Custom Trays c. Stock Trays d. Individualized Trays

b. Custom Trays

Latex gloves should always be worn for mixing additional silicone putties. a. True b. False

b. False

Reversible hydrocolloid works well in a dry environment. a. True b. False

b. False

The cost of impression materials is similar across the board. a. True b. False

b. False

Metal trays are likely to distort when removed from the mouth a. True b. False

b. False*

Moisture control is not critical. a. True b. False

b. False*

Which classification and use of impression materials is used for the construction of study molds? a. Plaster b. Irreversible Hydrocolloid c. Polysulfide d. Condensation Silicone

b. Irreversible Hydrocolloid**

Why might a dental hygienist not be able to take a silicone impression? a. It's considered an expanded function b. It's a breach of their state's practice act c. It's considered a "final impression material" d.It's a dental assistant's job

b. It's a breach of their state's practice act*

What type of gloves should you AVOID wearing when mixing the putty? a. Gloves that fit properly b. Latex gloves c. Nonlatex gloves d. Gloves that don't affect or interfere with the putty.

b. Latex gloves*

What is the first step when preparing the automix gun for taking impressions? a. Twist off the sealing cap b. Load the cartridge into the gun c. Install a new mixing tip d. Dispense a pea sized amount onto a paper towel

b. Load the cartridge into the gun*

It is important to note that proper ___ and ___ of the impression material are the factors most critical for success. a. Seating, removing b. Mixing, handling c. Pouring, placement d. Accuracy, flow

b. Mixing, handling

______ materials are the thickest impression materials, but they still record the details of a finger print. a. Wax b. Putty c. Impression compound d. Optical impressions

b. Putty

When mixing alginate, using warmer water increases the setting reaction rate. When mixing alginate, using colder water increases the setting reaction rate. a. Both statements are true b. The first statement is true, the second statement is false c. The first statement is false, the second statement is true d. Both statements are false

b. The first statement is true, the second statement is false*

Reversable hydrocolloid works best in dry environments. a. This statement is true. b. This statement is false.

b. This statement is false.

You should mix putty material while wearing latex gloves. a. This statement is true. b. This statement is false.

b. This statement is false.

The alginate powder tends to settle in bulk containers during shipment and storage. Before opening a new bulk container, the material should be "fluffed" by shaking or turning the container upside down and right side up for about ___. This will remix the heavier components with the lighter ones, resulting in the proper amount of material in each scoop. a. 30 seconds b. 45 seconds c. 1 minute d. 2 minutes

c. 1 minute

What type of impression material is elastic? a. ZOE b. Wax or Impression Compound c. Addition Silicone d. Plaster

c. Addition Silicone**

What impression must be a very exact replication of the size and shape of a preparation for the construction of a restoration or appliance? a. All impression materials b. Study model c. Casts

c. Casts*

What step should you take FIRST when preparing the putty material? a. Roll the mix into 3- to 4-inch-long cylinders and place into the tray b. Dispense equal volumes of the putty base and catalyst materials c. Don plastic over gloves d. Knead the material with your fingertips rather than in the palm of the hand.

c. Don plastic over gloves*

In preparation of the automix gun, the purpose of dispensing a pea-sized amount of material onto a paper towel is to: a. Ensure there's enough material in the gun b. Ensure there are no bubbles c. Ensure that the materials have not set and clogged the d. opening of the cartridge e. All of the above

c. Ensure that the materials have not set and clogged the d. opening of the cartridge*

When preparing the wash material it is important to place the plunger into the impression syringe to avoid trapping air. Latex gloves must be used when preparing the putty material. A. Both statements are true b. Both statements are false. c. First statement is true and the second statement is false. d. First statement is false and the second statement is true.

c. First statement is true and the second statement is false.

Which of the following impression materials have a study model? a. Polysulfide b. Wax or impression compound c. Irreversible hydrocolloid (alginate) d. Addition silicone

c. Irreversible hydrocolloid (alginate)*

Which of the following is the correct order for preparing the putty material a. Place over gloves on, knead materials together, dispense equal parts of base and catalyst material, finally roll into cylinder and place into tray. b. Dispense equal parts base and catalyst material, place over gloves on, roll into a cylinder and put in tray, finally knead materials together. c. Place over gloves on, dispense equal parts of the base and catalyst material, knead materials together, and finally roll into cylinder and place into tray. d. Knead materials together, dispense equal parts base and catalyst material, place over gloves on, finally roll into cylinder and place into tray.

c. Place over gloves on, dispense equal parts of the base and catalyst material, knead materials together, and finally roll into cylinder and place into tray.*

What kind of material was the first nonaqueous elastomeric "rubber" impression material developed for dentistry? Condensation silicone a. Zinc oxide-eugenol b. Wax c. Polysulfide d. None of the above

c. Polysulfide*

An advantage of silicone is that it does not need to be a. Put in a dryer b. Disinfected c. Poured immediately d. Put in a perforated tray

c. Poured immediately*

Before taking an impression for a crown and bridge restoration, what is placed in the gingival sulcus of the prepared tooth? a. Retraction string b. Pretraction cord c. Retraction cord d. You do not need to do anything before taking the impression

c. Retraction cord*

Alginate impressions are inexpensive and easy to use. These are great to use due to accurate and precise fitting for restorations. a. Both statements are true b. Both statements are false c. The first statement is true, the second statement is false d. The first statement is false, the second statement is true

c. The first statement is true, the second statement is false*

What is the use of retraction cord? a. To remove the impression from the mouth b. To remove a crown restoration. c. To be placed around the tooth in the gingival sulcus for a crown or bridge restoration. d. To increase bleeding for a restoration

c. To be placed around the tooth in the gingival sulcus for a crown or bridge restoration.

Which tray is a quadrant tray with a "J" shape that curls around the posterior of the most distal molars? a. Stock tray b. Impression tray c. Triple Tray d. Custom tray e. Bite registration tray

c. Triple Tray*

All steps for the tray reparation of addition silicone impression material are true EXCEPT a. Allow approximately 10 minutes to air dry so that the adhesive becomes tacky. b. Be sure to coat the facial, lingual, and occlusal surfaces of the inside of the tray c. Select plastic stock tray and paint it with tray adhesive to aid in the retention of the impression material. d. Any adhesive will aid in the retention of the impression material in the tray

d. Any adhesive will aid in the retention of the impression material in the tray

Wax is moveable at mouth temperature, and solid at a temperature tolerated by oral tissues. a. The first statement is correct, the second one is incorrect b. Both are correct c. The first statement is incorrect, and second statement is correct d. Both are incorrect

d. Both are incorrect

Impressions taken with condensation silicone do not need to be poured up right away. Condensation silicone is currently the most popular impression material. a. Both statements are true b. The first statement is true, the second statement is false c. The first statement is false, the second statement is true d. Both statements are false

d. Both statements are false*

When preparing putty material, you should use____ rather than____. a. Palm of hand; fingertips b. Fingertips; spatula c. Palm of hand; spatula d. Fingertips; palm of hand

d. Fingertips; palm of hand

Which isn't true about a retraction cord? a. Reduces Bleeding b. Is placed on the gingival tissue c. Temporarily shrinks the tissue d. Is held without motion for approximately 10-12 minutes

d. Is held without motion for approximately 10-12 minutes**

You should use the same scoop for preparing the putty material, after that use your fingertips to knead the material. a. Both statements are true. b. Both statements are false. c. The first statement is true, the second statement is false. d. The first statement is false, the second statement is true.

d. The first statement is false, the second statement is true.

Which of the following should be avoided when mixing the putty material for the impression? a. Using an automix gun b. Preparing the impression syringe c. Kneading the material d. Using latex gloves

d. Using latex gloves

The equipment needed while using addition silicone impression material includes all of the following except... a. Tray adhesive b. Impression syringe/syringe tips c. Impression cartridges/cartridge gun d. Vibrator

d. Vibrator

Which of the following is an inelastic impression material? a. Agar (reversible hydrocolloid) b. Polysulfides c. Condensation Silicones d. Zinc oxide-eugenol (ZOE)

d. Zinc oxide-eugenol (ZOE)

Custom trays are used to take final impressions for: a. Full dentures b. Inlays c. Crowns d. Bridges e. All the above

e. All the above*

Tips for the Clinician include which things? a. Avoid wearing latex gloves when mixing the putty b. Moisture control is critical c. Avoid wearing exam gloves d. Heat control is critical e. Both a and b are correct

e. Both a and b are correct*