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PERMANENT MANDIBULAR LATERAL INCISOR
1. PERMANENT MANDIBULAR
LATERAL INCISOR
Dr. Ramil B. Simsuangco
Oral Anatomy Professor
College of Dentistry
Manila Central University
2. Mandibular lateral incisor
Develops from 4 primary center of
growth(lobes) ; 3 labial, 1 lingual lobe
Larger than mandibular central incisor
Almost similar to central incisor, has a smooth
and minimal depressions along its surfaces.
3. Labial Aspect
Crown outline is trapezoidal
Resembles mand. central
incisor, but not bilaterally
symmetrical
Distal side has a slight bulge
Crown is tilted distally, incisal
ridge is straight and slopes
downward towards the distal.
- Root is tapering and apical and
curved slightly to distal
4. The distoinsical angle is
noticibly more rounded
compared to mesioincisal
angle
This aids in telling left from
right
5. Contact Areas:
Mesial- incisal 3rd, near the
incisal ridge
Distal- incisal 3rd, but more
cervical to the level of the
MCA
6. Lingual Aspect
Almost same as central incisor
Crown outline is trapezoidal
Crown tilted distally on its root
base
Small smooth cingulum and is
slightly distal to the long axis of
toot
Mesial marginal ridge is longer
than distal marginal ridge
7. Marginal ridges and lingual
fossa are not conspicuous
and is generally smooth
The root is narrow lingually
than labially
8. Mesial Aspect
•Crown outline is triangular
•Mesial side of crown longer than
distal side, causing incisal ridge to
slope downward towards distal
•Tendency toward deeper concavity
immediately above CEJ on the distal
surface
•Crown is longer than central, root is
considerably longer
•Larger in all dimensions than
central incisors
9. Comparison of Central and Lateral
incisor
From the mesial
aspect,
a distolingual twist of
the incisal edge places
the distal portion more
lingually
10. Distal Aspect
Almost the same as mesial aspect
Cementoenamel junction usually 1 mm
less than central incisor’s CEJ
Distal side tapers distolingually making
the mesial side not visible from the distal
aspect.
11. Incisal
Aspect
The crown is broader labiolingually than
mesiodistally
Not bilaterally symmetrical, distal is twisted