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Root canal therapy consists of a cascade of scientifically based technical procedures.Lack of knowledge,its poor application or a compromise or a break in a chain of proper procedures can lead to a number of accidents which are collectively called " Endodontic Mishaps".These accidents can occur during diagnosis,access preparation,cleaning and shaping,obturation and post space preparation.Those who perform root canal therapy must have a basic knowledge of etiologic factors and methods of prevention as well as recognition,management and prognosis.Knowing and understanding the relation between these factors may help in increasing the chances of preventing possible endodontic treatment failures.

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