South Indian population presented Type IV ertucci's canal morphology as the most common in mandibular first and second pre-molars followed by Type V. CBCT scanning poses a greater advantage in assessing the complexity of root canal morphology and planning an appropriate endodontic treatment for the same.

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Mandibular first molar commonly has two roots, the mesial and the distal root. Surprisingly in some mandibular first molar has an unusual extra third root in between mesial and distal root. This extra root is the most commonly seen in lingual side and is called as radix entomolaris. If this extra root is seen on the buccal side, it is termed as radix paramolaris (RP), which is a very rare phenomenon. Recently, various case report studies has shown the presence of third canal in the mesial and distal roots of mandibular molars. They are named as middle mesial and middle distal canal, respectively. Here, we present a case report of mandibular second molar showing three canals in the mesial root and a RP.

The objective was to review the literature of the root and root canal morphology of the human Mandibular canine. Published studies cite the anatomy and morphology of the mandibular canine tooth. Individual case reports of anomalies were included to demonstrate the extreme range of variation. Almost all of the teeth in the anatomic studies were single rooted (94.8 %). The incidence of two roots (5.2 %) was extremely rare. Anatomic studies of the internal canal morphology found that a single canal was present in 89.4 % of the teeth, while 10.6 % of the teeth had two or more canals. However, the root and root canal morphology of the mandibular canine can be extremely complex and requires careful assessment. As an Endodontist, one should be aware of all the probable nooks and crannies of the complex root canal, its protean permutations, and combinations, to render the finest possible treatment. As is the case with any other treatment, endodontic therapy; if performed in the properly delineated and precise manner spells more than 99 % success rate. This review article attempts to bring out the possible nuances of the complex root canal system and various methods of reckoning with these significantly essential details.