The maxillary second premolars lie between the first premolar and the first molar in the upper jaw (Universal 4 on the right and 13 on the left, FDI 15 and 25). Their two cusps, buccal and palatal, are almost equal in height, and they usually have a single flattened root, with one or two canals. They erupt at about 10-12 years.
| Location | Upper dental arch, between the first premolar and the first molar on each side |
|---|---|
| Parts |
|
| Nerve Supply | Middle superior alveolar nerve when present, otherwise anterior and posterior superior alveolar nerves (maxillary division of the trigeminal nerve); Greater palatine nerve (palatal gingiva); Superior alveolar nerves (buccal gingiva) |
| Blood Supply | Anterior and middle superior alveolar branches of the infraorbital artery; Posterior superior alveolar artery |
| Venous drainage |
|
| Lymphatic drainage |
|
Crush and grind food, passing it back toward the molars.
The root tips of upper second premolars may lie close to the floor of the maxillary sinus, so infection can spread into the sinus and extraction can occasionally open into it. They look much like the first premolar but have a rounder crown, a shorter central groove and usually only one root. About half have two root canals, which must be found during root canal treatment.
Infection from the tooth root spreading into the maxillary sinus, usually on one side, with facial pressure and nasal discharge.
Decay in the pits, fissures and contact surfaces, common in teeth that are hard to clean.
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