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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