Provisional Coverage Chapter 51 Copyright 2009 2006 by

Chapter 51 Lesson 51. 1 Copyright © 2009, 2006 by Saunders, an imprint of

Learning Objectives Pronounce, define, and spell the Key Terms. Discuss the indications for provisional coverage for a crown or fixed-bridge preparation. Describe the types of provisional coverage. Discuss the dental assistant’s role in making a provisional crown or bridge. List home-care instructions for the patient with provisional coverage. Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Provisional Coverage Provisional coverage is a protective covering worn temporarily while a fixed prosthesis is being fabricated in the dental laboratory. Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Purposes of Provisional Coverage Reduces sensitivity and discomfort of the prepared tooth Maintains the function and aesthetics of the prepared tooth Protects the margins of the preparation Prevents shifting of the adjacent or opposing teeth Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Custom Provisional Coverage The most versatile provisional coverage for crown and bridge preparations Can be used for posterior or anterior crowns or bridges. Ø Provides the best fit Ø Most natural-looking Ø Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Fig. 51 -1 Custom provisional coverage. Copyright © 2009, 2006 by Saunders, an imprint

Criteria for Constructing Provisional Coverage The coverage is aesthetically acceptable to the patient The contours are similar to those of the natural tooth. The cervical margin is smooth and fits snugly. Coverage must not extend below the margin of the preparation. The occlusal surface is aligned with the occlusal plane of the adjacent teeth. When cemented, the provisional coverage remains stable, stays in place, and is comfortable for the patient. The provisional coverage can be easily removed without damage to the tooth or adjacent tissues. Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Preformed Polymer Crowns Provisional shell-like crowns are designed specifically for premolars and molars. Shells are made of a polymer material designed with the anatomic features of natural teeth. Ø Preformed polymer is available for single crowns and bridgework. Ø Composite resin bonds with preformed crown to preparation. Ø Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Fig. 51 -2 Preformed polymer crown. Copyright © 2009, 2006 by Saunders, an imprint

Aluminum Crowns Aluminum crowns are designed specifically for premolars and molars. Such crowns are available in a range of sizes for posterior teeth. Ø Surfaces may be anatomic or nonanatomic. Ø The crown is sized, contoured, and cemented in place. Ø Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Preformed Polycarbonate Crowns Tooth-colored crowns are selected for anterior teeth, where appearance is important. Available in a variety of sizes, shapes, and shades. Ø Easily adapted to margins. Ø Suitable for short- or longer-term use. Ø Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.

Fig. 51 -4 Preformed polycarbonate crowns. Copyright © 2009, 2006 by Saunders, an imprint

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 contact. Once the floss is placed below the contact, pull it through. If the provisional covering is loose or lost, contact the office immediately to have it recemented. Copyright © 2009, 2006 by Saunders, an imprint of Elsevier Inc. All rights reserved.