INBDE (Integrated National Board Dental Examination) Practice Exam

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Which is the only premolar with multiple lingual cusps and a lingual groove?

Maxillary 1st premolar
Mandibular 1st premolar
Maxillary 2nd premolar
Mandibular 2nd premolar

The correct answer is: Mandibular 2nd premolar

The mandibular 2nd premolar is the only premolar with multiple lingual cusps and a lingual groove. The maxillary 1st premolar only has two cusps on the lingual side, while the mandibular 1st premolar has only one lingual cusp and no lingual groove. The maxillary 2nd premolar also only has one lingual cusp and a single lingual groove. Therefore, the mandibular 2nd premolar is the only choice that meets both criteria of having multiple lingual cusps and a lingual groove.