Fabrication of Bleaching Trays

Question 1

What are the two classifications of discolorations?

Answer 1

extrinsic

intrinsic

Question 2

What are extrinsic discolorations?

Answer 2

stains on outer surfaces of teeth

• poor oral hygiene
• smoking
• chewing
• beverages
• foods

Question 3

What is intrinsic discoloration?

Answer 3

results from a change to the structural composition or thickness of the dental hard tissues (fluorosis, tetracycline)

Question 4

What is the tray material we use?

Answer 4

Ultradent .035 SOFT tray material

Question 5

The _____ tray will fit comfortably over the dentition and remain in place throughout treatment.

Answer 5

flexible

Question 6

Where would a patient feel discomfort if the tray were too thick?

Answer 6

TMJ

Question 7

What would happen if the tray were too thin?

Answer 7

chewed/worn through before the end of treatment

Question 8

Rigid trays would irritate _____ tissues during insertion and throughout wear.

Answer 8

soft

Question 9

Steps for using the vacuum-form machine to construct trays:

Answer 9

1. Remove protective layer backing
2. Place 1 sheet of tray material onto vacuum
3. make sure sheet is centered and secure
4. raise secured tray material up to heating element
5. Place molds on unit
6. Turn heating switch to “on”
   7 Heat tray material until is sags approximately 1/2 to 1 in
7. Turn on Vacuum and drop material onto models
8. Allow vacuum to run for 30-60 seconds

Question 10

How long should you run the vacuum?

Answer 10

30-60 seconds

Question 11

No fold should be over which two critical areas?

Answer 11

1. Teeth

2. Gingiva 2 mm apical to clinical crowns

Question 12

True or False: Let material cool completely before removing or trimming.

Answer 12

True, to prevent distortion

Question 13

True or False: I is okay to have a fold in the material that is apical to the CEJ.

Answer 13

True

Question 14

What are the two methods for tray trimming?

Answer 14

1. scissors

2. Electric “Tray Magic Trimmers”

Question 15

Trim facial edges in a ____ design.

Answer 15

scalloped

Question 16

True or False: Scalloping is optional on the lingual.

Answer 16

True

Question 17

For bleaching trays in the clinic, how are the trays trimmed?

Answer 17

to the gingival margin in a scalloped design on both the facial and lingual

Question 18

When using scissors, trim _____ mm from the most apical portion of the gingival crest of the teeth both facial and lingual.

Answer 18

3-5 mm

Question 19

Which heat setting should the Tray Magic be set to?

Answer 19

7 or 8

Question 20

True or False: The Tray Magic is unlike the vacuum form machine in that it heats up immediately.

Answer 20

True

Question 21

You must use a _______ while using the Tray Magic.

Answer 21

fulcrum

Question 22

What should you do if tray material begins to collect on the tip of the blade?

Answer 22

turn the heat up to 9 or 10, then return heat setting to 8.5 when ready to start again

Question 23

What could have caused a tray material to “bell”?

Answer 23

• Material was stretched off the model while it was still warm
• insufficient vacuum time
• palate left in model
• overextended the base

Question 24

True or False: Trays must be disinfected with Birex for 5 mins before placing in your mouth.

Answer 24

False, 10 mins!