Abstract
Endodontic retreatment varies in many respects from primary endodontic therapy. Among the differences is the fact that filling materials have to be removed from the root canals before the routine endodontic treatment may be performed. Also, a high percentage of the teeth that are indicated for retreatment have been restored, and the restoration has to be considered before retreatment can be initiated. The coronal restoration or the post and core can be removed or retained. Each such option is related to specific conditions and has its advantages and disadvantages. The treatment modalities which are available for removing filling materials from root canals also have clinical significance and should be selected carefully. This article discusses the significance of restorations and canal obturation in relation to endodontic retreatment and suggests guidelines for the treatment planning of retreatment.
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