D47

#47. The lower second molar is much like the first molar but generally easier to instrument because the curvatures are milder. The occurrence of four canals in the second molar is more rare than in the first molar, and only two canals is a more frequent possibility than in the first molar. A small percentage of lower second molars have a special root canal anatomy; two or more of the canal openings in the pulp chamber floor join to form a C-shaped groove. This has occasioned the name "C-shaped canals". Usually the mb or ml canal joins the distal canal, sometimes both mesial canals join the distal canal. Deeper in the root there sometimes are further ramifications.

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