This document discusses the morphology and chronology of the mandibular central incisor. It notes that the mandibular central incisor is the smallest tooth in the mouth, erupts between ages 6-7, and has a straight single root. Key anatomical features include its bilaterally symmetrical shape, narrow mesiodistal width, sharp mesioincisal and distoincisal angles, and nearly straight labial outline with a convex cervical third.

1. DR.Monika
MDS 2ND YEAR

2.  Contents
 Morphology of Permanent Mandibular
Central Incisor
 Chronology and dimensions of Mandibular
Central Incisor

3.  Mandibular incisors are four in number
 Mandibular central incisor and lateral are
similar in anatomy and complement each
other in function
 They are smaller than the maxillary incisors
 Mandibular central incisor erupts between
the age of 6 and 7
 Mandibular lateral incisor erupts between
the age of 6 and 8

5.  Mandibular Central Incisor is the smallest
tooth in the dentition

7.  Labial surface of mandibular central incisor
is very small.
 It is the narrowest tooth mesiodistally of all
the permanent teeth

8.  It is bilaterally symmetrical
 It is the only incisor where both
mesioincisal and
 distoincisal angles are sharp and at right
angles

9.  The lingual aspect is concave from the
incisal edge to the cervical line
 Cingulum is smooth and barely visible

10.  The surface is smooth and devoid of any
grooves.
 No other tooth in the mouth, except the
mandibular lateral incisor, shows so few
developmental lines and grooves.

11.  The labial outline is almost straight, except
near cervical third where it is convex
 The labial surface is inclined lingually

12.  The lingual margin is ‘S’ shaped
 The cervical line on the mesial and distal
surface is convex incisally

13.  Distal surface is very similar to the mesial
surface.
 The cervical line is less curved

15.  This aspect illustrates the bilateral
symmetry of this tooth.
 The labiolingual diameter is greater than
mesiodistal diameter.

16.  Newly erupted teeth show mamelons which
wear off upon mastication.

17.  The root is single and straight.
 The deflection of the root if present is on
the labial or distal side