Mandibular Premolars Flashcards
Which mandibular premolar may be confused with a mandibular canine?
Mandibular 1st premolar
Which cusp is the shortest among the mandibular premolars?
Mandibular 1st premolar
Which marginal ridge of the mandibular 1st premolar has the most inclination?
a. How do the marginal inclinations of the mandibular 1st and 2nd compare with each other?
Mandibular 1st premolar = 45 degrees
a. The Mandibular 2nd premolar is horizontal M marginal ridge not inclined
What unique anatomical feature is typically found on the mesial half of the crown surface of a mandibular 1st premolar?
ML groove
From a proximal view of a mandibular 1st premolar, where is the facial cusp located, relative to the mid-root long axis?
a. How does this compare with that of the mandibular 2nd premolar?
Mandibular 1st premolar = centered over the root
a. Mandibular 2nd premolar = Buccal to long axis of tooth
From a proximal view of a mandibular premolar, where is the lingual cusp tip located relative to the lingual root outline?
Lingual to the root outline (tooth leans lingual to fit within the maxillary arch)
Where is the lingual HOC found on the mandibular 2nd premolar?
a. How does this compare with the mandibular 1st premolar?
Mandibular 2nd premolar 2 cusp form = middle third, 3 cusp form = occlusal -middle third junction
a. Mandibular 1st premolar = middle third
Which premolar could exhibit several different occlusal forms?
a. Which are these forms?
Mandibular 2nd premolar
a. 2 (Type H & U) or 3 (Type Y) cusp
Which premolars might develop from 5 lobes?
Mandibular 2nd premolar 3 cusp variety
Which lingual cusp of a mandibular 2nd premolar is the larger of the 3-cusp variety?
Mesial Lingual Cusp (DL cusp is smaller)
Which premolar might be said NOT to have a transverse ridge?
Mandibular 2nd premolar 3 cusp variety (None of the triangular ridges line up
From a facial view, which mandibular premolar has the sharper cusp?
Mandibular 1st premolar
On a mandibular 1st premolar, how does the mesial HOC compare with the distal HOC?
a. What is unique about this?
b. Which other tooth might exhibit this same characteristic?
M HOC = D HOC
a. This is unlike most other teeth (it is common for M HOC to be more occlusal than D HOC)
b. Mandibular central incisor (both M & D HOC are equal)
From an occlusal view, which premolar has the least taper lingually?
Mandibular 2nd premolar 3 cusp variety (possible divergent to the lingual)
The ML groove is found only in which premolar?
Mandibular 1st premolar
