Fabrication of Bleaching Trays Flashcards
What are the two classifications of discolorations?
extrinsic
intrinsic
What are extrinsic discolorations?
stains on outer surfaces of teeth
- poor oral hygiene
- smoking
- chewing
- beverages
- foods
What is intrinsic discoloration?
results from a change to the structural composition or thickness of the dental hard tissues (fluorosis, tetracycline)
What is the tray material we use?
Ultradent .035 SOFT tray material
The _____ tray will fit comfortably over the dentition and remain in place throughout treatment.
flexible
Where would a patient feel discomfort if the tray were too thick?
TMJ
What would happen if the tray were too thin?
chewed/worn through before the end of treatment
Rigid trays would irritate _____ tissues during insertion and throughout wear.
soft
Steps for using the vacuum-form machine to construct trays:
- Remove protective layer backing
- Place 1 sheet of tray material onto vacuum
- make sure sheet is centered and secure
- raise secured tray material up to heating element
- Place molds on unit
- Turn heating switch to “on”
7 Heat tray material until is sags approximately 1/2 to 1 in - Turn on Vacuum and drop material onto models
- Allow vacuum to run for 30-60 seconds
How long should you run the vacuum?
30-60 seconds
No fold should be over which two critical areas?
- Teeth
2. Gingiva 2 mm apical to clinical crowns
True or False: Let material cool completely before removing or trimming.
True, to prevent distortion
True or False: I is okay to have a fold in the material that is apical to the CEJ.
True
What are the two methods for tray trimming?
- scissors
2. Electric “Tray Magic Trimmers”
Trim facial edges in a ____ design.
scalloped
True or False: Scalloping is optional on the lingual.
True
For bleaching trays in the clinic, how are the trays trimmed?
to the gingival margin in a scalloped design on both the facial and lingual
When using scissors, trim _____ mm from the most apical portion of the gingival crest of the teeth both facial and lingual.
3-5 mm
Which heat setting should the Tray Magic be set to?
7 or 8
True or False: The Tray Magic is unlike the vacuum form machine in that it heats up immediately.
True
You must use a _______ while using the Tray Magic.
fulcrum
What should you do if tray material begins to collect on the tip of the blade?
turn the heat up to 9 or 10, then return heat setting to 8.5 when ready to start again
What could have caused a tray material to “bell”?
- Material was stretched off the model while it was still warm
- insufficient vacuum time
- palate left in model
- overextended the base
True or False: Trays must be disinfected with Birex for 5 mins before placing in your mouth.
False, 10 mins!
