Permanent Mandibular Lateral Incisor

1. MANDIBULAR LATERAL
INCISOR
DR.Monika MDS
Maxillofacial Pathology ,Microbiology and Forensic
Odontology

2. Introduction
 Second tooth from the midline in each lower
quadrant
 Shares a mesial contact area with the
central incisor.
 Mandibular lateral incisor is slightly wider
mesiodistally

3.  slightly larger in all respects than the
mandibular central incisor
 complements the central in function.
 The distal contact is with the deciduous
mandibular canine until that tooth's exfoliation
and then contact is shared with the permanent
canine.

4. TOOTH NUMBERING
SYSTEM
 UNIVERSAL SYSTEM - 23,26
 ZSIGMONDY / PALMER - 2 2
 FDI SYSTEM - 32, 42

5. CHRONOLOGY
 First evidence of calcification 3-4 months
 Crown completion 4-5 years
 Eruption 7-8 years
 Root completion 10 years

7. Labial Aspect
 Incisal margin may slope slightly
gingivally toward distal, which results in a
distoincisal angle that is more rounded
than same angle of central incisor .
 This feature creates a slightly shorter distal
margin, when compared to mesial outline

9.  Contact area on distal is more cervically
located than on the mesial, thus creating a
more cervically located height of contour
on distal outline
 Both heights of contour are still in incisal
third

11. Lingual Aspect
 Lingual outlines are similar to those of labial
aspect
 Structures of lingual surface are similar to
their counterparts on the central incisor
 except cingulum is more offset to distal,
and as a result curvature of cervical line is
also offset distally .Mand. Lat. Inciosor
Mand. Central Incisor M D D M

13.  Concavity in lingual aspect is slightly more
when compared to mandibular central
incisor
 • MMR > DMR Lingual fossa more concave

14. Mesial & Distal Aspects
 Two surfaces are similar to their
counterparts on central incisor, with a few
minor exceptions.
 Lateral's distal surface is slightly shorter
inciso-cervically than mesial surface.
 Both cervical line curvatures are slightly less
than their counterparts in the central. MESIAL
DISTAL

16.  Mesial cervical line shows greater incisal
curvature than does the distal
 At distal contact area, height of contour is
more cervically located than on mesial
 In incisal third, distal contact area is very
near to junction of incisal & middle thirds & is
most cervically located of any mandibular
incisor contact

17. Incisal Aspect
 Incisal edge is not straight mesiodistally, as
it is in central, rather it curves toward lingual in
its distal portion
 Lingual contour (cingulum) appears
displaced toward distal. These factors give
crown the appearance of being slightly twisted
on its root
 Best identifying features, when
differentiating this tooth from central incisor M
D

18. Root
Root length is normally a little greater than in
central incisor
Root is also slightly thicker and wider
Root concavities may be found on the mesial
and distal root surfaces, and if present,
concavity in distal is usually more pronounced

19.  Variations and Anomalies:
 Anomalies are rare, but occasionally a
bifurcated root is found

27. References
 CONCISE DENTAL ANATOMY &
MORPHOLOGY : JAMES L FULLER
 DENTAL ANATOMY, PHYSIOLOGY &
OCCLUSION: WHEELER’S
 TEXTBOOK OF DENTAL ANATOMY,
PHYSIOLOGY & OCCLUSION: RASHMI GS
(PHULARI) INTERNET