Anatomical variation of mandibular second molar and its implications in endodontic treatment.

The variations of anatomical and morphological characteristics of the teeth are very important for any practitioner. These differences in root morphology are influencing the success of the endodontic therapy and the long-term prognosis of the tooth, especially when it is an abutment for a prosthetic restoration. Before beginning an endodontic treatment, the clinician must take into account the morphological variations of the root anatomy. This article describes the therapeutic approach in a case of mandibular second molar with four canals abnormally located instead of three. This anatomical variation is a major risk for both endodontic and prosthetic treatment failure. The lack of knowledge of root and pulp anatomy permits the errors in diagnosing and treatment planning. Unfilled canals, left like this by omission, can compromise both the endodontic and prosthetic treatment. For the success of the any dental treatment is critical to know the normal configuration of the pulp and to be aware of the possible variations.