3. PRESENTING
BY
AISWARYA DILEEP
1st

4. INTRODUCTION
 There are four lateral incisors in both
arches
 The Maxillary lateral incisor is
a tooth that is located mesially from
both side of maxillary central incisors .
 Distally from both side of maxillary
canines.
 It supplements central incisors in function
they are similar anatomically .
 Functions are shearing or cutting food
,helps in speech and support for lips.

5. TOOTH NUMBERING SYSTEMS
UNIVERSAL SYSTEM
- 7,10
 ZSIGMONDY / PALMER
-
22
 FDI SYSTEM
-
12,22

6. CHRONOLOGY
•First evidence of calcification
•Enamel completed
•Eruption
•Root completed
: 10-12 months
: 4-5 years
: 8-9 years
: 11
years

7. DIMENSIONS
Cervico incisal Length of crown
Length of the root
Mesiodistal diameter of crown
Mesiodistal diameter
of crown at cervix
Labio or Buccolingual
diameter of crown
Labio or Buccolingual diameter
of crown at cervix
Curvature of cervical line -Mesial
Curvature of cervical line –Distal
: 9.0 mm
: 13.0 mm
: 6.5 mm
: 5.0mm
: 6.0 mm
: 5.0 mm
: 3.0 mm
: 2.0 mm

8. ASPECTS

10. n
tally
tally

12. LINGUAL ASPECT (PALATAL)
Marginal ridges and Cingulum are more prominent
Fossa will be rounded at the mesiomarginal ridge
which is straight and longer whereas distal marginal
ridge will be slightly curved and small.
Root is narrower

13. MESIAL ASPECT
The crown is shorter and root is relatively
long.
The curvature of the cervical line is marked in
the direction of the incisal ridge
Labial outline of the root from this aspect is
straight
Cingulum often appears more convex in
outline
Root appears as a tapered cone with bluntly
rounded apical end
Line drawn through centre of the root tends to
bisect the incisal ridge of the crown

14. DISTAL ASPECT
Width of the crown distally appears thicker
than it does on the mesial aspect from marginal
ridge to labial face
Curvature of the cervical line is usually a
millimeter or so less in depth than on the mesial
side
A developmental groove present distally on
this crown extending on the root
The distal contact area is located farther from
the incisal margin as compared to the mesial
contact area

16. INCISAL ASPECT
oIt sometimes resembles central incisor
or canine
oIt is more or less ovoid in form
oCingulum may be large ,as is the incisal ridge
oLabiolingual dimensioon may be greater than usual in
comparison with mesiodistal dimension
oExhibit more convexity labially and lingually from incisal aspect
than maxillary central incisor
oThe mesiolabial and distolabial line angles are much more
rounded and the lobes of labial surface are less clearly
demarcated in the lateral incisors is,because of the high degree of
convexity of the labial surface

17. TRAITS
ARCH TRAITS
MAXILLARY LATERAL INCISOR
MANDIBULAR LATERAL INCISOR
1. Rectangular , broader crown
2. Mesial and distal out line is convex
3. Mesioincisal and distoincisal angle is
rounded
4. Prominent marginal ridge
5. Fossa will be deep and ‘V’ shaped
1. Long and narrower mesiodistally
2. Long Mesial and distal out line is
straight
3. Mesioincisal and distoincisal angle
is straight and sharp
4. Less prominent marginal ridge
5. No fossa
6. Less prominent cingulum
6. More prominent cingulum

18. TYPE TRAITS
CENTRAL INCISOR
LATERAL INCISOR
Mesiodistally
Mesioincisal angle
Distoincisal angle
Mesial profile
Distal profile
Mesial contact
Wide
Sharp (90 degrees)
Slightly rounded
Straight
Round
Incisal third
Distal contact
Junction of incisal and
middle thirds
Relatively flat
Narrow
Slightly rounded
Distinctly rounded
Slightly rounded
Highly rounded
Junction of incisal and
middle third
Middle third
CROWN
1. LABIAL ASPECT
Labial surface
Rounded
2. LINGUAL ASPECT
Marginal ridges and
cingulum
Lingual fossa
Moderately pronounced
More prominent
Moderately deep
Deep

19. CROWN
CENTRAL INCISOR
LATERAL INCISOR
CEJ
Contact area
Moderately curved
Incisal third
Cingulum
Moderately convex
Less curved
Junction of incisal and
middle third
Convex
Triangular
Slightly convex
Visible labially
Prominent
Ovoid
Highly convex
Slightly visible to absent
Rounded
3. MESIAL ASPECT
4. INCISAL ASPECT
Outline
Labial surface
Lobes
Mesio and Distolabial
angles