Root canal morphology of the maxillary second molar
The maxillary second molar closely resembles the first molar. However, the number of canals is usually three, sometimes two, but also four canals can be found (two canals in the mb root). A typical upper second molar resembles the first molar, the difference being that the orifices of the mb and db canals are closer together; sometimes almost forming a line (mb – db – pal). Sometimes the two buccal canals are side by side in the mesio-distal dimension. The apical part of the palatal and the mesiobuccal canals is not as curved as in the first molar.
Average length - 20 mm
The secondary mesio-buccal canal of maxillary molars. – usually 3 rooted with 3 canals but can exhibit a 4th canal. Three orifices may be configured in a straight line.
One canal – 63%
Two canals – 37%
Type II – 13%
Type III – 24%
Access - quadrilateral (to locate 4th canal). The DB canal orifice typically exists beneath the central occlusal pit (unlike in the first molar).
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