Quiz 3 Flashcards
What is the veneer?
A thin shell of tooth-covered material
The veneer is a ceramic restoration that matches the shade of adjacent teeth.
What is the maximum space allowed between the crown margin and the finish line of the preparation?
0.5 mm
This space should not exceed 0.5 mm at the cervical margins of the provisional.
How is a Maryland bridge held in place?
Winglike extensions bonded onto the lingual surfaces of adjacent teeth
These extensions provide support for the pontic.
What component of a fixed bridge provides support for the replacement tooth?
Abutment
The pontic is the false tooth that replaces the natural missing tooth.
What is the setting time for the resin placed in a preformed crown?
Approximately 90 seconds
The crown is lifted off and on the prepared tooth until the resin hardens.
The two types of provisional coverage include _____ and _____.
custom; prefabricated
These are the commonly used types of provisional coverage.
What home care instructions are given for a patient with provisional coverage?
Avoid chewing on the provisional
Patients should also brush carefully and contact the office if the provisional comes off.
Which component of a fixed bridge replaces a missing natural tooth?
Pontic
The abutment provides support for the pontic.
When is laboratory-fabricated coverage used?
When several teeth have been prepared
It is also used for multiunit bridges.
What is an appropriate patient home care instruction for someone with provisional coverage?
Pull floss through the contact, either to the facial or lingual side
Patients should not ‘pop’ the floss in and out.
What is the term for each component of a fixed bridge?
Unit
A crown is a cast restoration covering the entire anatomic crown of a tooth.
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
The occlusion is checked after curing.
If the liquid or powder acrylic material is being used for the provisional, how many drops of liquid are used?
10
Ten drops of liquid are placed in a dappen dish for each unit being prepared.
When would a stainless steel crown be used for provisional coverage?
For the restoration of primary posterior teeth
Stainless steel crowns are used when strength is essential.
Which device is used to determine the tooth color for ceramic crowns or bridges?
Shade guide
It contains different shades of teeth for color matching.
What is a contraindication for provisional coverage?
Cover the facial of a veneer preparation
Very little tooth structure is removed for veneer preparations.
What is the name for the opening into which a post is cemented?
Post channel
A keyway slot holds the post steady in the canal.
Which provisional preformed crowns are used on anterior teeth when appearance is important?
Polycarbonate
Other crowns like stainless steel are not esthetic.
A gingival retraction cord is placed _____ the crown preparation is completed; it is removed _____ the final impression is taken.
after; before
The cord must be removed to get an accurate impression.
Under which condition would a post-and-core be recommended before placing a crown?
The tooth has been treated endodontically
A post can be a retention aid for devitalized teeth.
What is the most common method to obtain gingival retraction?
Chemical retraction
This is typically done with a retraction cord.
Which material is placed under a porcelain veneer to mask tooth discoloration?
Opaque liner
This material helps to conceal discoloration.
What is the purpose of provisional coverage?
To reduce sensitivity and discomfort of the prepared tooth
It also protects the margins of the final restoration.
Which material could be used for a core buildup?
Composite material
Amalgam can also be used if already in place.
When is a thermoplastic tray, used to fabricate a custom provisional, made?
Before the dentist prepares the teeth
This ensures the tray replicates the teeth accurately.
Which procedure takes place during the second appointment for the placement of a cast restoration?
Try-in
The second appointment also involves cementation and finishing.
Which of the following is an example of a fixed prosthesis?
Porcelain veneer
Fixed prostheses are cemented into place and cannot be removed by the patient.
What could occur when fabricating a provisional if undercuts are present on proximal surfaces?
Locking on
Provisional restorations can become locked on due to material flow into undercuts.
Which cement is most commonly used with provisional crowns?
Temporary
Occasionally, a final cement may be used for specific reasons.
What is the most commonly used cement with provisional crowns?
Temporary cement
Temporary cement is primarily used for provisional crowns, while final cements are more difficult to remove.
How is the area under the pontic of a bridge maintained?
Clean under the pontic using floss and a floss threader
Flossing under the pontic is essential as it cannot be reached with a toothbrush.
What occurs at the final appointment in the crown and bridge process?
Cementation of a final restoration
The final appointment is focused on cementing the restoration, while try-in and shade selection occur earlier.
Which indirect restoration is minimally invasive and can replace a congenitally missing lateral incisor?
A resin-bonded bridge
A resin-bonded bridge (Maryland bridge) is less invasive compared to traditional bridges or implants.
Which statement is correct regarding prefabricated temporary crowns?
Cellulose acetate is a thin clear shell available in all tooth types
Cellulose acetate serves as a carrier for provisional material and is used for both anterior and posterior preparations.
Which type of crown does not cover the entire anatomic portion of the tooth?
Three-quarter crown
A three-quarter crown covers part of the tooth, unlike full crowns which cover the entire anatomic portion.
How far below the margin of the preparation should the provisional crown sit?
It should be flush with the margin
The provisional crown should fit snugly with no more than 0.5 mm space between the crown margin and preparation finish line.
Once the acrylic-loaded impression is on the prepared tooth, it should remain for approximately how long?
3 minutes
The acrylic needs to set for about 3 minutes in the mouth after being doughy for 1 to 2 minutes in the dappen dish.
Which procedure would require a patient to wear a provisional prosthesis for a longer period of time?
Implants or periodontal therapy
Complex treatments like implants or periodontal therapy often necessitate extended use of provisional prostheses.
What type of cast restoration fits snugly within a tooth preparation and covers only a portion of the occlusal and proximal surface?
Inlay
An inlay is designed specifically to fit within the tooth preparation, while an onlay covers more surfaces.
What is the final step after cementing the provisional crown?
Check the occlusion
After cementation, checking the occlusion with articulating paper is crucial; polishing occurs earlier in the process.
The provisional is trimmed to within ___ mm of the gingival shoulder of the prepared tooth.
1 mm
Trimming the provisional to 1 mm of the gingival shoulder ensures a proper fit and aesthetic appearance.
