8. The mesial and distal outline of
the root tapered to a pointed
apex
•The apex directed distally
1 2
•The mesial and distal outline
of the root tapered to a blunt
apex
•The apex centralized on
the long axis
9.
10. Lingual aspect
Elevations:
•Marginal ridges (mesial and
distal)
•Cingulum (cervically)
•Incisal ridge
Depressions:
Lingual fossa, more concave and circumscribed
than and may be pitted
Cingulum
Margin
ridg
Incisal ridge
1
11.
12. 1
2
The crown long and thick
labiolingually.
Shorter and thinner
except at incisal ridge is
thicker.
The mesial surface is flat The surface is flatter.
Contact area at I 13 near
the M I angle.
Near or at the junction of I
& M 13
Mesial aspect
Lb Lg Lb Lg
13.
14. 1 2
Distal aspect
C.A. at the junction of I & M
13
No depression
In the center of the
crown.
Developmental
depression on the root
15.
16. 1 2
Wide M D. Smaller in size.
Labial and lingual outline
are flat and broad.
Labial and lingual outline
are more rounded.
When palatal pit is present; it is located in the depth of
the lingual fossa
Incisal aspect
