Chapter 51 Provisional Coverage Copyright 2003 Elsevier Science

Chapter 51 Provisional Coverage Copyright 2003, Elsevier Science (USA). All rights reserved. No part of this product may be reproduced or transmitted in any form or by any means, electronic or mechanical, including input into or storage in any information system, without permission in writing from the publisher. Power. Point® presentation slides may be displayed and may be reproduced in print form for instructional purposes only, provided a proper copyright notice appears on the last page of each print-out. Produced in the United States of America ISBN 0 -7216 -9770 -4 Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

Fig. 51 -1 Types of provisional coverage. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

Fig. 51 -8 Preformed polymer crown. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

Fig. 51 -13 Aluminum crown cemented. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.

Fig. 51 -14 Size and shape of a polycarbonate crown. Copyright 2003, Elsevier Science (USA). All rights reserved.

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. Copyright 2003, Elsevier Science (USA). All rights reserved.