Prepared by:

Ismail,Hamze Gamil,Omar

INTRODUCTION

Two in number

Mesial side: Maxillary Central Incisor

Distal Side: Maxillary canines

FUNCTION:

Cutting food

Speech and support for lips

Supplements central incisor in function and are similar looking

Tooth Numbering

UNIVERSAL SYSTEM – 7 and 10

PALMER – 2,2

FDI Sytem – 12, 22

Chronology

First evidence of calcification-: 10-12 months

Enamel completed: 4-5 years

Eruption: 8-9 years

Root completed: 11 years

Dimensions

In mm

Cervico- incisal length of crown 9.0

Length of the root 13.0

Mesiodistal diameter of crown 6.5

Mesiodistal diameter of crown cervix 5.0

Labio diameter of crown 6.0

Labio diameter of cervix 5.0

Mesial curvature of cervical line 3.0

Distal curvature of cervical line 2.0

Labial Aspect

Crown outline is trapezoidal

Mesial margin is approax. Similar to Maxillary

Central incisor.

Distal margin more rounded

than maxillary Central incisor.

Mesio-incial and disto incisal line are more

rounded than maxillary Central incisor.

Incisal outline is similar to maxillary central

incisor but not straight.

Lingual Aspect

Mesial margin is more convex than maxillary

central incisor and

distal margin is more rounded than maxillary

central incisor

Lingual Fossa is deep triangular shaped and

occupies 2/3rd of lingual surface of crown.

Lingual 2/3rd

Fossa will be rounded at the mesio-marginal

ridge which is straight and longer whereas

distal marginal ridge will be slightly curved and

small.

Mesial Aspect

Very similar to the central incisor,

with lessened dimension

Curvature of the cervical line is marked in the

direction of the incisal ridge.

Root appears as a convex with like rounded

apical root end.

Distal Aspect

Distal surface is smaller and more convex in

all dimensions than mesial surface

Curvature of cervical line is usually a

millimeter or so less in depth than on mesial

side.

Incisal Aspect

Resembles central incisor

Cingulum may be large, as is the incisal ridge

Labiolingual dimension may be greater than

usual in comparison with mesiodistal

dimension

Exhibit more convexity labially and lingually

from incisal aspect than maxillary central

incisor

Mesiolabial and distolabial line angles are

more rounded.