Guest guest Posted November 23, 2010 Report Share Posted November 23, 2010 Hi guys Which of the following is the most critical step in root canal therapy? Cleaning and shaping. Obturation. A hermetic apical seal. A hermetic coronal seal. C and D. Answer: A. Cleaning and shaping. Historically, many authors have written that obturation is the most important part of root canal therapy. Recent studies have shown that achieving adequate chemomechanical debridement is paramount. The most common cause of root canal failure is inadequately disinfected canal systems. A rubber dam is always indicated during root canal therapy. Even if a superior obturation is achieved, all dental work leaks on a microscopic level and residual microorganisms will eventually cause failure of the endodontic treatment rendered. A coronal seal has emerged as being more important than the apical seal for long term success as a failed coronal seal provides easier access for microbial invasion of the canal system relative to the failed apical seal in most cases. Even in cases where the endodontic therapy is questionable, a good coronal restoration has been shown to improve the overall result. Reference: Walton RE, Torabinejad M. Principles and practice of endodontics, 3rd Ed. W.B. Saunders Best regardsAlenaOzieva Quote Link to comment Share on other sites More sharing options...
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