Chapter 18 Provisional Restorations

Chapter 18  Provisional Restorations

Complete Chapter Questions And Answers
 

Sample Questions

MULTIPLE CHOICE

1. How long would it take a prepared tooth without occlusal/incisal and proximal contact to migrate laterally or occlusally/incisally?
a.
Days
b.
Weeks
c.
Months
d.
Years

ANS: A
A prepared tooth without occlusal/incisal and proximal contact may migrate laterally or occlusally/incisally within as soon as a few days. The restoration, which was designed to fit the tooth in its original position, may now be too high because of occlusal/incisal migration or may not seat properly as a result of lateral migration of the prepared tooth.

REF: p. 326
TOP: Criteria for Provisional Coverage (Maintain Prepared Tooth Position Relative to Adjacent and Opposing Teeth)

2. If the provisional restoration itself is too high, the results may be those associated with:
a.
trauma from occlusion.
b.
occlusal drifting of the prepared tooth.
c.
gingival irritation from food impaction.
d.
lateral migration of the prepared tooth.

ANS: A
If the provisional restoration itself is too high, the results may be those associated with trauma from occlusion. If it does not contact the adjacent teeth, gingival irritation from food impaction is likely. It is important that the precise occlusal/incisal and proximal contacts be provided for. The provisional restoration should share the forces of adjacent and opposing teeth.

REF: p. 326
TOP: Criteria for Provisional Coverage (Maintain Prepared Tooth Position Relative to Adjacent and Opposing Teeth)

3. If the surfaces of a provisional restoration are _____, the process of chewing will excessively force food directly into the gingiva. An _____ restoration may trap plaque by not allowing for any self-cleansing or gingival stimulation from the chewing process.
a.
overcontoured; overcontoured
b.
overcontoured; undercontoured
c.
undercontoured; overcontoured
d.
undercontoured; undercontoured

ANS: C
If the surfaces of a provisional restoration are undercontoured, the process of chewing will excessively force food directly into the gingiva. An overcontoured restoration may trap plaque by not allowing for any self-cleansing or gingival stimulation from the chewing process. Both scenarios may lead to irritation, inflammation, and recession.

REF: p. 327 TOP: Criteria for Provisional Coverage (Protect the Gingival Tissues)

4. Which of the following provisional materials is limited to intracoronal placement?
a.
Provisional cement
b.
Provisional acrylic
c.
Provisional composite
d.
Provisional polycarbonate crown

ANS: A
Provisional cement is limited to intracoronal placement. Provisional acrylic and composites can be used for extracoronal coverage as well. Provisional restorations, such as stainless steel or polycarbonate crowns, may be preformed or made specifically for individual procedures, such as custom acrylic or composite crowns and intracoronal restorations.

REF: p. 328 TOP: Provisional Crown Materials