1. Provisional Coverage Chapter 51
Copyright 2003, Elsevier Science (USA).
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2. Introduction
Provisional coverage is a temporary protective covering that is temporarily cemented to a prepared tooth for a single crown or to abutment teeth for a bridge preparation.

3. Purpose of Provisional Coverage
Reduces sensitivity and discomfort in the prepared tooth.
Maintains the function and esthetics of the tooth.
Protects the margins of the preparations.
Prevents shifting of the adjacent or opposing teeth.

4. Fig. 51-1 Types of provisional coverage.

5. Custom Provisional Coverage
The most common type of provisional coverage used for crown and bridge preparations. The technique can be used for either posterior or anterior crowns or bridges.

6. Criteria for Constructing Provisional Coverage
Must be esthetically acceptable to the patient.
The contours are similar to those of the natural tooth.
The cervical margin is smooth and fits snugly.
Does not extend below the margin of the preparation.
The occlusal surface is aligned with the occlusal plane of the adjacent teeth.
When cemented, it remains stable, stays in place, and is comfortable for the patient.
Can be readily removed without damage to the tooth or adjacent tissues.

7. Preformed Polymer Crowns
Provisional shell-like crowns that are designed specifically for premolars and molars. These shells are made from a polymer material that is designed with anatomic features of natural teeth.

8. Fig. 51-8 Preformed polymer crown.

9. Aluminum Crowns An aluminum crown is available in a range of sizes.
The crown surface may be anatomic or nonanatomic.
The crown is sized, contoured, and cemented in place.

10. Fig. 51-13 Aluminum crown cemented.

11. Preformed Polycarbonate Crowns
The preformed polycarbonate crown is tooth‑colored and is selected for anterior teeth where appearance is important.
These crowns are available in a variety of sizes, shapes, and shades.

12. Fig. 51-14 Size and shape of a polycarbonate crown.

13. Home Care Instructions for Provisional Coverage
Bite and chew carefully, and avoid sticky foods.
When flossing, do not “pop” the floss in and out of the contact. Once the floss is placed below the contact, pull the floss through.
If the provisional covering is loose or lost, contact the office immediately to have it recemented.