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Maxillary left second molar

A smaller molar behind the first molar, with three roots that are often closer together.

FDI: 27
Universal: 15
Palmer: UL7
Roots: Usually three, sometimes fused
Root canals: Usually three
Eruption: About 12–13 years

Form and anatomy

The crown is smaller than that of the first molar and more varied. The distopalatal cusp is reduced and in many teeth absent, which gives a heart-shaped, three-cusped occlusal outline; when present, the four-cusp form resembles a smaller first molar. The oblique ridge is less prominent, and the cusp of Carabelli is rare. The three roots, mesiobuccal, distobuccal and palatal, are shorter, less divergent and more inclined toward the distal than those of the first molar, and two or all three are sometimes fused. The palatal canal is usually the widest, and a second mesiobuccal canal is found less often than in the first molar. Like the first molar, its root apices often lie close to the floor of the maxillary sinus, which matters in extraction and implant planning.

Function

Grinding food.

Clinical relevance

Roots may be partly fused; relationship to the maxillary sinus is clinically relevant.

Neighbouring teeth

Mesial neighbour: Maxillary left first molar
Distal neighbour: Maxillary left third molar
Same tooth, other side: Maxillary right second molar
Opposing tooth: Mandibular left second molar

This text is a draft and has not yet been reviewed by a dental professional. Educational reference only, not for diagnosis or treatment.