Class notes
Tooth morphology and eruption dates
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Learning tooth morphology of deciduous and permanent dentist, as well as eruption dates.
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Tooth morphologyPermanent teeth
Upper 1 (central incisor)
2 grooves on the labial surface
mesial corner has a right angle
distal corner has a curved angle
palatal surface has a concave surface bounded by ridges (marginal ridges)
it has a singulum – a rounded block on top
Upper 2 (lateral incisor)
spade like shape on the labial side
ride angle corner mesially against U1
rounded corner against canine
smaller than U1
on the palatal side there is small pit (can fit an instrument into)
the tip of the root bends towards the distal end
longer root than U1
Lower 1 (central incisor)
narrower than Upper 1 or Upper 2
looks like upper 2
lingual side has a scoop
1 root
The root has a groove on the distal side
The other side is rounded on the root
Lower 2 (lateral incisor)
Wider across the incisal edge than lower 1
It is fan shaped
The distal surface of the root has a groove
The crown appears twisted on the root
Upper 3 (canine)
Central cusp
The labial surface is more curved than Upper 1 or upper 1
The palatal side has a large singulum
There is a ridge from the singulum to the cusp edge
The root curves around
The distal slope of the cusp is longer than the mesial slope
, Lower 3 (canine)
Smaller singulum than upper 3
Shorter mesial slope on the cusp than the distal
Mesial surface meets the labial surface at a right angle
Tip of the crown appears twisted
Upper Premolars
Erupt after molars
The approximal surface has 2 cusps
One larger buccal cusp and one smaller palatal cusp
Oval/egg shaped
Wider buccal side than palatal side
There is a fissure between the 2 cusps
Upper 4 ( 1st premolar)
2 roots
Well divided roots (although can be fused)
There is a concave area at the base of the crown. It fits up against the canine
– so its on the mesial side. (how you can tell if its right or left)
groove on the mesial surface of the marginal ridge
Upper 5 (2nd premolar)
single root usually with a groove
occlusal surface is oval shaped
smaller palatal cusp
has the fissure between the palatal and buccal cusp
it doesn’t have the concave area either side of the crown, it is convex instead
the tip of the palatal cusp is closer to the mesial surface of the tooth (how you
can tell right from left)
there is a groove running mesially over the marginal ridge
lower premolars
the crown is tilted towards the tongue (lingually)
it has a marked buccal curvature
the occlusal surface is circular shaped
lower 4 (lower 1st premolar)
lingual cusp is much smaller than buccal cusp
it has a ridge on the occlusal surface from the buccal to the lingual cusp
single root
flattened root from the mesial to distal side#
the root is longer in relation to the crown
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