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Terms in this set (33)
If the liquid or powder acrylic material is being used for the provisional, how many drops of liquid are used?
10
How far below the margin of the preparation should the provisional crown sit?
The provisional should be flush with the margin.
Which statement is a contraindication for provisional coverage?
Cover the facial of a veneer preparation.
The occlusal surface of the provisional coverage should sit _____ the occlusal plane of the adjacent teeth.
even with
Which provisional, preformed crowns are used on anterior teeth, when appearance is important?
Polycarbonate
Which provisional uses a polymer shell filled with a hybrid composite resin that bonds with the preformed crown and tooth?
Preformed polymer
What is the advantage of using preformed crowns for provisional coverage?
It reduces time required for the procedure.
Preformed shells comes with anatomic features of natural teeth.
The provisional is trimmed to within ___ mm of the gingival shoulder of the prepared tooth.
1
What instructions are given regarding home care instructions for a patient with provisional coverage?
If the provisional comes off, contact the office immediately so it can be put back on.
When is a thermoplastic tray, used to fabricate a custom provisional, made?
Before the dentist prepares the teeth
The cervical margins of the provisional should have no more than ___ mm of space between the crown margin and the finish line of the preparation.
0.5
Of the materials listed, which one is used most commonly for custom provisional coverage?
Self-curing acrylic resin
What is one disadvantage of using custom provisional coverage?
It can be the most time-consuming to make.
What should be done if the margins of the provisional are not adequate?
Additional material is added at the inner aspect of the margin and then the provisional is reseated for setting.
Which procedure would require a patient to wear a provisional prosthesis for a longer period of time?
Implants or periodontal therapy
Once the acrylic-loaded impression is on the prepared tooth, it should remain on the tooth for approximately how long?
3 minutes
What is the setting time for the resin placed in a preformed crown?
90 to 120 seconds
What is the most common type of provisional coverage used for crown and bridge preparations?
Custom-made
The two types of provisional coverage include _____ and _____.
custom; prefabricated
When would a stainless steel crown be used for provisional coverage?
When strength is essential
Commonly for the primary teeth.
When is laboratory-fabricated coverage used?
Several teeth have been prepared, such as in a multiunit bridge.
Which of the following is appropriate patient home-care instruction for someone with provisional coverage?
Pull floss through the contact, either to the facial or lingual side, once floss is placed below the contact.
What is the set time for mixed acrylic before placing it into the mouth?
1 to 2 minutes
What could occur when fabricating a provisional if undercuts are present on proximal surfaces?
Locking on
Why is it necessary to keep the preliminary alginate impression moist?
To keep the alginate from distorting
During a crown preparation appointment, when are preformed provisional crowns tried in for size and shape?
After
Which statement is incorrect about prefabricated crowns?
The crowns are available for bridges as well as for single units.
Why is the provisional placed on the tooth in the patient's mouth for the final curing stage?
To avoid excess shrinkage of the provisional during the final curing stage
Which cement is most commonly used with provisional crowns?
Temporary
Which statement is correct regarding preformed polycarbonate crowns?
They can be used as a mold to fabricate a custom provisional.
Which statement is correct regarding prefabricated temporary crowns?
Crowns made of polycarbonate are used where appearance is important.
What is the purpose of provisional coverage?
Maintain function to the area of the mouth.
What is the final step after cementing the provisional crown?
Check the occlusion.
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