Comparative Traits – Mandibular 1st vs 2nd Premolars

Which mandibular premolar has a nonfunctional lingual cusp?

First premolar

Which mandibular premolar shows more lingual tilt of the crown?

First premolar

Which mandibular premolar typically has a sharper buccal cusp?

First premolar

The buccal cusp of which mandibular premolar is more blunt and rounded?

Second premolar

Which mandibular premolar has a shorter root?

First premolar

Which mandibular premolar’s crown is longer overall?

First premolar

Which mandibular premolar more commonly exhibits a mesiolingual groove?

First premolar

Which mandibular premolar has a Y-shaped occlusal groove pattern?

Second premolar

Which mandibular premolar has a lingual cusp that is more developed and functional?

Second premolar

Which mandibular premolar has a mesial marginal ridge that slopes at about 45°?

First premolar

Which mandibular premolar can have a square-shaped occlusal outline?

Second premolar

Which mandibular premolar has a diamond-shaped occlusal outline?

First premolar

Which mandibular premolar more frequently exhibits a distal root depression?

Both

Which mandibular premolar may have a lingual groove between two lingual cusps?

Second premolar

Which mandibular premolar’s mesial contact is located more cervically than its distal contact (a unique feature)?

First premolar

Which mandibular premolar has its mesial marginal ridge positioned more cervically than the distal?

First premolar

Which mandibular premolar generally exhibits a longer root-to-crown ratio?

Second premolar

Which mandibular premolar’s occlusal surface is more visible from the lingual view?

First premolar

Which mandibular premolar has a more symmetrical occlusal outline?

Second premolar

Which mandibular premolar’s root apex is more blunt?

Second premolar

Which mandibular premolar has a higher and more horizontal marginal ridge alignment?

Second premolar

Which mandibular premolar more commonly has a central fossa?

Second premolar

Which mandibular premolar has a shorter mesial cusp ridge compared to its distal cusp ridge?

First premolar

Which mandibular premolar exhibits greater distal bulge, giving a slight distal crown tilt?

First premolar

Which mandibular premolar’s buccal cusp tip is almost directly over the midroot axis?

First premolar

Which mandibular premolar shows more occlusal surface variation among individuals?

First premolar

Which mandibular premolar’s occlusal table is broader mesiodistally?

Second premolar