Premolar Morphology - mandibular Flashcards
When do the 34/44 erupt?
10-12
How many developmental lobes do the 34/44 have?
4
3 buccal
1lingal
What is longer on the mandibular first premolar - distal or mesial?
distal is longer
the buccal cusp swings slightly mesially
What is the distinguishing factor of the mandibular first premolar? (cusps)
the buccal cusp is always bigger than the lingual
tiny lingual cusp - non-functional
What direction does the mandibular first premolar crown tilt?
lingually
What side of the lower first premolar has the marginal groove?
the mesial
top arrow
What side of the lower first premolar has a more cervical CEJ?
The mesial
What tooth is this?
44/34
Why does the 34/44 have a pronounced buccal cusp ridge?
as it is tilting palatally
What tooth is this?
34/44
Describe the distinguishing features of the 34/44 occlusal surface
Can see the marginal groove on the mesial side
How would you distinguish the left and right mandibular first premolar?
look for the mesial marginal groove
and mesial CEJ is more occlusal
What tooth has significant variations?
the lower 5s
What are the 2 main forms of the lower 5s?
tricuspid and bicuspid
What tooth has more supplemental grooves - lower 4s or 5s?
5s
Name the features of the buccal lower 5s
How would you distinguish the left and right lower 5s?
the mesial lingual cusp
1 root is curved distally
the distal marginal ridge or more cervically placed (see more occlusal surface)
Name the features of the lingual lower 5s
What tooth is this?
lower 5
bicuspid
What side of the lower 5 has a more cervically placed marginal ridge?
The distal
