The mandibular second premolars sit between the first premolar and the first molar in the lower jaw (Universal 29 on the right and 20 on the left, FDI 45 and 35). They have one buccal cusp and either one or, often, two lingual cusps, giving a Y-shaped groove pattern, and a single root. They erupt at about 11-12 years.
| Location | Lower dental arch, between the first premolar and the first molar on each side |
|---|---|
| Parts |
|
| Nerve Supply | Inferior alveolar nerve (mandibular division of the trigeminal nerve); Mental nerve (buccal gingiva); Lingual nerve (lingual gingiva) |
| Blood Supply | Inferior alveolar artery (from the maxillary artery) |
| Venous drainage |
|
| Lymphatic drainage |
|
Crush and grind food, working with the molars.
After the third molars, the lower second premolar is one of the teeth most often missing from birth, in which case the baby molar above it may be kept for many years. The mental foramen lies near its root tip, so lower lip numbness can follow surgery or infection here. Like the first premolar it can carry a dens evaginatus.
The tooth never forms, leaving a retained baby molar or a gap that may need an implant or orthodontic closure.
An extra pulp-containing tubercle on the biting surface that can fracture and lead to pulp infection.
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