Mandibular 1st molar arch traits Flashcards
What age does the tooth erupt?
6-7 years
at what age does the tooth erupt?
9-10 years
what 3 cusps are visible from the buccal view?
MB, DB, and Distal
What do the two grooves separate?
the buccal groove separates the MB and DB cusp
the distal groove separates the DB and D cusp
what are the contacts from the buccal view
mesial: junction middle and occlusal 1/3
distal: middle 1/3
how many roots?
2
where is the shallow depression located from the lingual view
from cervical line to bifurcation on lingual side
what are the heights of contour from the mesial view?
buccal: cervical 1.3
lingual: junction of middle and occlusal 1/3
From the distal view what can be seen and why?
the occlusal surface due to the lower marginal ridges
which root is larger? Mesial or Distal?
M>D
how many cusps are there?
5 and only tooth to have this
3 buccal and 2 lingual
What two variations can be present with this tooth
tuberculum sextum between ML and DL cusp which affects the lingual outline
Tuberculum intermedium which forms a distal triangular ridge of the ML cusp
