Chronology:
•Enamel organ appearance.
•Beginning of calcification.•Crown completed.
•Eruption.
•Root completed.
5 miu
10-12 m4-5 y
8-9 y
11y
Labial Lingual Mesial Distal
Inc1isal
Maxillary lateral incisor
The lateral incisor is smaller in all dimensions than the central incisor.
1 2
1 2
sharp M I angle. rounded M I angle.
rounded D I angle. more rounded D I angle.
Labial aspect
Incisal outline Straight Rounded
M D MD
21
Newly erupted tooth has mamelons.
The mamelons are less pronounced.
1 2
Labial surface:
Convex or slightly flat. More convex.
Labial D G. Less prominent.
surface
•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
Lingual aspectElevations:
•Marginal ridges (mesial and
distal)
•Cingulum (cervically)
•Incisal ridge
Depressions:Lingual fossa, more concave and circumscribed
than and may be pitted
Cingulum Marginal
ridges
Incisal ridge
1
12
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 1\3 near the M I angle.
Near or at the junction of I & M 1\3
Mesial aspect
Lb Lg Lb Lg
1 2Distal aspect
C.A. at the junction of I & M 1\3
No depression
In the center of the crown.
Developmental depression on the root
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
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