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Root Canal Failure

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Root canal treatment usually fails when treatment falls short of usual standards. The causes of failure of initial endodontic therapy include intraradicular and extraradicular causes. Many of the teeth undergoing root canal treatment do not respond to initial therapy due to intraradicular causes i.e. procedural errors that prevent the control and prevention of intracanal endodontic infection. The procedural errors include poor access cavity design, untreated canals (both major and accessory), poor cleaning and obturation, complication of instrumentation (ledges, perforations or separated instruments), overextension of root filling materials and coronal leakage.5 Extraradicular causes of endodontic failures include periapical actinomycosis,

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