This document discusses temporization, or the placement of interim restorations. It describes the importance of temporization for maintaining tooth vitality and position. Common problems with temporization include underestimating fabrication time and delays replacing temporaries with permanent restorations. The document outlines several techniques for fabricating temporary crowns from various materials to address these issues, including metal, acrylic, and polycarbonate crowns. It also lists cardinal requirements and limitations of temporary crowns.

1. TEMPORIZATION
INTERIM COVERING

2. Proper occlusal and
proximal contacts
to promote patient
comfort and
maintain tooth
position.

3. Proper occlusal and
proximal contacts
to promote patient
comfort and
maintain tooth
position.

6.  The placement of an interim
covering on a tooth after
preparation is a biologic
mandate to maintain vitality.
 There are three major problems
commonly associated with the
clinical fabrication of temporary
crown:

7. 1. The time involvement
necessary for the fabrication of
adequate interim tooth
coverage is underestimated by
the majority of the dentists.

8. 2. Treatment coverage is not
always replaced by
permanent restorations
within the shortest possible
time.

9. 3. There are presently no
inexpensive, tissue
compatible materials that
are fabricated by the
dentist.

10. ***One possible measure to combat
these problems is to increase the
length of the appointments to
prevent hastily constructed
treatment restoration.
Another is to program and
coordinate appointment dates with
lab services to accelerate the date of
insertion of the final restorations.

11. 8 Cardinal Requirements for
Temporization:
1. The pulp of the tooth must be
insulated from all forms of
adverse stimuli.
2. Arch position of the prepared
teeth should be maintained and
stabilized to prevent extrusion of
teeth and promote the accuracy of
the impression.

12. 3. Treatment restorations should
not impinge the gingival
tissues causing inflammation
and tissue recession.
4. It should appear reasonably
esthetic, particularly in the
incisor and premolar areas.

13. 5. Treatment restorations should
develop occlusal function to
assist in the establishment of
a satisfactory maxillo-
mandibular relationship.
6. It should also possess
sufficient inherent strength to
withstand light forces of
occlusion.

14. 7. It should be fabricated in such
a manner to permit the patient
to keep the area clean and
serve as a healing matrix to
tissues surrounding prepared
teeth and edentulous areas.

15. 8. Construction techniques
should be within the realm
of the average dentist and
also capable of being easily
removed with minimal
damage to the teeth and
supportive tissues.

16. Types of Temporary
Crowns:
Metal (precious and non-
precious) and Non-metal
Materials

17.  Extensively
Nickel-
damaged Chromium
primary teeth
crown
 May be applied
to secondary
teeth but are
more suitable to
primary teeth
 Very hard

18. Aluminum shell
 Restricted to PM
and M area crown
 Possess a consis-
tency that permits a
definite amount of
molding to a px’s
occlusion, but lacks NON-ANATOMIC
the rigidity for ANATOMIC
acceptable marginal
strength and
proximal contacts

19.  Employed primarily Preformed
in the posterior
teeth commercial metal
 Excessive irritation crown
or recession can
be prevented by
contouring of the
gingival margins
 Time saving aspect
is the most
attractive feature of
this type of
temporary crown

20. Cellulose acetate crown form
 Cellulose acetate
crown form consists
of thin, soft, and
transparent material.
Sizes and shape
can be selected
from a mold guide.
The crown form is
trimmed and
festooned to fit the
preparation without
impingement on the
soft tissue.

21. Preformed polycarbonate anteriors
 Polycarbonate crown
forms are more
tolerable, selected to
establish contact
areas
***Polycarbonate crown
form remains on the
prepared tooth,
whereas the cellulose
crown matrix is
removed prior to
cementation.

22.  Used when multiple
preparations are
Heat-cured resins
involved for bridges
 Teeth are reduced
on a 2nd set of dx
casts to simulate
tooth prep, places
the desired
occlusion and
contact areas on
mounted models
 Wax is boiled off
and heat-cured
temporaries are
fabricated
 Need only slight
modification prior to
interim cementation

23. Cold-cure alginate impression
technique
 An alginate  After the prep., resin
impression of the mixture is placed on
teeth is taken on the alginate
the day of the impression
preparations are corresponding to the
made but before crown prep.
any reduction of  Alginate impression
teeth with the resin mixture
is placed back into
 Alginate impres- the mouth
sion is set aside  Impression is
and kept in a damp removed just prior to
environment to the rigid set of the
prevent excessive acrylic
distortion

24.  Stone models of Template
both arches are
used prior to mouth technique
prep.
 Constructed with
the aid of a thermal
vacuum machine
that adapts a plastic
sheet over the entire
stone cast
 Plastic sheet is
trimmed around the
teeth to be prepared

25.  A wire or non-precious
metal post is adapted
to the canal. The Post-crown
selected crown form is
then filled with an
technique
acrylic resin and
placed over the post,
including a portion of
the radicular surface of
the tooth.
 After sufficient
polymerization has
taken place, the crown
is removed along with
the temporary post,
which is set within the
resin

26. Limitations of Temporization:
 Lack of inherent strength
 Poor marginal adaptation
 Color instability
 Poor wear properties
 Inadequate bonding characteristics
 Poor tissue response to irritation
 Arduous cement removal
 Detectable odor emission

27. Uses of Temporary Crowns
1. Serves as a healing matrix for
the gingival tissue
2. Serve as a predictor of the final
result
3. Serve as an oral hygiene
training device

28. 4. Provide security and comfort to
the patient while the final
restoration is being fabricated.
5. Saves considerable time at each
subsequent appointment, during
which castings are fitted, joints
are soldered and porcelain is
adapted prior to the final delivery

29. Make the necessary adjustments
Try in of temporary crown
Polish the crown before cementation