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Endodontically treated teeth often require a post-and-core build-up for restoring the teeth to optimum health and function. The removal of gutta percha from the root canal filling, to prepare the post space is most critical in success of the endodontic and prosthodontic treatment. A 4 mm remaining length of root canal filling, after post space preparation, is commonly assumed to maintain sealing ability similar to that of the intact filling. Post space may be prepared either immediately usingdoi:10.5005/johcd-5-3-142 fatcat:ynjq7qqd7jb7ng4ljztdeoo7du