Effect of post length on endodontically treated teeth: fracture resistance

Numerous techniques to restore endodontically treated teeth have been advocated with criteria for success depending on variations in length, shape and surface configuration, amount of dentin structure , materials and techniques used in construction. In prosthodontic practice, the task of restoring endodontically treated teeth is encountered almost daily. The pulpless tooth is known to present a higher risk of biomechanical failure than vital teeth. The generally accepted explanation for the increased failure rate is the substantially loss of tooth structure during endodontic access, dowel space preparation, and cavity preparation.

The posts are necessary to allow the clinician to rebuild enough tooth structure to retain restorations. The price for added retention, however, may be an increased risk to damage tooth structure.