D18

#18. The upper third molar is often a "reduced version" of the second molar. There are usually two or three root canals, and the orifices of the buccal canals may be very close to each other. Some upper third molars have a root canal anatomy similar to first molars. Sometimes the buccal canals share the same orifice in the pulp chamber but then separate 1 - 4 mm below the chamber floor (this may also occur in the second molar). Some upper third molars have additional roots and/or root canals.

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