Abstracto

Retreatment: Another Chance for Surviving

Asmaa Altalla

The major goals of root canal treatment are to clean and shape the root canal system and obturate it in 3 dimensions to prevent re-infection of the tooth although initial root canal therapy has been shown to be a predictable procedure with a high degree of success failures can occur after treatment. Recent publications for initial root canal treatment reported failure rates of 14%–16%. Lack of healing is attributed to inadequate knowledge & equipment for practitioner lead to poor diagnose, treatment plan and poor prognosis with persistent intraradicular infection residing in previously un-instrumented canals, dentinal tubules, or in the complex irregularities of the root canal system. The extraradicular causes of endodontic defects include periapical actinomycosis, enterococcus faecalis and propionibacterium propionicum, and extraneous body reaction triggered by extruded endodontic materials, an accumulation of endogenous cholesterol crystals in apical tissues, and an unresolved mucous lesion that can lead to initial endodontic "failure." The causes for doing retreatment are include iatrogenic procedural errors such as poor access cavity design, untreated canals (both major and Accessory) canals that are poorly cleaned and obturated complications of instrumentation (ledges, perforations, or separated instruments and overextensions of root-filling materials) Coronal leakage has also been blamed for post treatment disease has persistent intracanal and extracanal infection and radicular cysts.