2. ο Contents
ο Morphology of Permanent Mandibular
Central Incisor
ο Chronology and dimensions of Mandibular
Central Incisor
3. ο Mandibular incisors are four in number
ο Mandibular central incisor and lateral are
similar in anatomy and complement each
other in function
ο They are smaller than the maxillary incisors
ο Mandibular central incisor erupts between
the age of 6 and 7
ο Mandibular lateral incisor erupts between
the age of 6 and 8
7. ο Labial surface of mandibular central incisor
is very small.
ο It is the narrowest tooth mesiodistally of all
the permanent teeth
8. ο It is bilaterally symmetrical
ο It is the only incisor where both
mesioincisal and
ο distoincisal angles are sharp and at right
angles
9. ο The lingual aspect is concave from the
incisal edge to the cervical line
ο Cingulum is smooth and barely visible
10. ο The surface is smooth and devoid of any
grooves.
ο No other tooth in the mouth, except the
mandibular lateral incisor, shows so few
developmental lines and grooves.
11. ο The labial outline is almost straight, except
near cervical third where it is convex
ο The labial surface is inclined lingually
12. ο The lingual margin is βSβ shaped
ο The cervical line on the mesial and distal
surface is convex incisally
13. ο Distal surface is very similar to the mesial
surface.
ο The cervical line is less curved
14.
15. ο This aspect illustrates the bilateral
symmetry of this tooth.
ο The labiolingual diameter is greater than
mesiodistal diameter.
16. ο Newly erupted teeth show mamelons which
wear off upon mastication.
17. ο The root is single and straight.
ο The deflection of the root if present is on
the labial or distal side