The figure below shows a mesial view (A) and a distal view (B) of a linguobuccal section. Identify the tooth.
A) Mandibular first premolar
B) Mandibular second premolar
C) Mandibular first molar
D) Mandibular second molar

Question

The figure below shows a mesial view (A) and a distal view (B) of a linguobuccal section. Identify the tooth. 
A) Mandibular first premolar 
B) Mandibular second premolar 
C) Mandibular first molar 
D) Mandibular second molar

Quizplus · Accepted Answer

Identifying features include the two separate root canals in the mesial root. Although mandibular molars usually have a total of two root canals, a mesial and a distal, this tooth is the most likely to have two canals located in its mesial root in addition to a canal in the distal root. Note that when this occurs, the mesial root has a buccal and a lingual canal, both of which are considerably smaller than the distal canal in the same tooth. The distal root has only one canal. From the mesial aspect only the mesiolingual and mesiobuccal cusps can be seen (there are five total cusps). The mesiolingual is the higher and more conical of the two visible cusps.

The Figure Below Shows a Mesial View (A) and a Distal