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8/10/2019 Mandibular Permanent Lateral Incisor
1/4
1Mandibular Permanent Lateral Incisor
Labial/
BuccalGeometric
outline of
the crown
Trapezoid
Small uneven side cervically and
Long side occlusally
Outlines
of the
crownand root
Crown Outline
Mesial outline is very slightly convex with distal outline
more convex Mesio-incisal angle is sharp
Disto-incisal angle is rounded
Incisal edge is sloping distally; if the tooth is newly
erupted, the mamelones will be seen. Mamelones are
small projections of enamel present on the incisal 1/3 of
newly erupted teeth.
Root Outline The mesial and distal outline of the root tapered to a
point of apex
Centralized on a long axis with the apex curved distallySurface
anatomy
of the
crown
and root
Elevations
Crown surface is smooth and convex with maximum
convexity at the cervical 1/3 representing the cervical
ridgelinear elevation found on cervical 1/3 on the
labial/Buccal aspect of all teeth.
Root surface is smooth and convex
Depression
Shallow developmental grooves could be seen separating
the mamelonesdevelopmental grooves are linear
depressions representing the complete union or fusion
of the lobes
8/10/2019 Mandibular Permanent Lateral Incisor
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2Mandibular Permanent Lateral Incisor
Palatal/
LingualGeometric
outline of
the crown
Trapezoid
Small uneven side cervically and
Long side occlusally
Outlines
of the
crownand root
Lingual outline is reverse of labial outline
Crown Outline Mesial outline is very slightly convex with distal outline
more convex
Mesio-incisal angle is sharp
Disto-incisal angle is rounded
Incisal edge is sloping distally; if the tooth is newly
erupted, the mamelones will be seen. Mamelones are
small projections of enamel present on the incisal 1/3 of
newly erupted teeth.
Root Outline
The mesial and distal outline of the root tapered to apoint of apex
Centralized on a long axis with the apex curved distally
Surface
anatomy
of the
crown
and root
Elevations
Mesial and Distal Marginal ridgeMesial and Distal
marginal ridges are linear elevations found on the
lingual aspect of all anterior teeth located on the mesial
and distal borders of each tooth.
Cingulum is twisted distallylinear elevation found on
the lingual aspect of all anterior teeth located on the
cervical 1/3 of the tooth.
Incisal RidgeLinear elevation found on the lingual
incisal 1/3 of incisors
Depressions
Lingual Fossalinear depression found on the lingual
aspect of all anterior teeth
8/10/2019 Mandibular Permanent Lateral Incisor
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3Mandibular Permanent Lateral Incisor
Mesial
and
Distal
Geometric
outline of
the crown
Triangular in shape
Base is cervically
Apex incisally
Outlinesof the
crown
and root
Crown OutlineLabial: convex with maximum convexity at the cervical 1/3
which represents cervical ridge Linear elevation found on
the cervical 1/3 of labial/buccal aspect of all teeth
Lingual:
Convex incisally which represent incisal ridge
Concave in middle 1/3 which represent lingual fossa
Linear elevation found on the lingual incisal 1/3 of
incisors
Convex cervically which represent cingulum linear
elevation found on the lingual aspect of all anterior teethlocated on the cervical 1/3 of the tooth.
Cervical: curves incisally (Mesial is always more curved than
distal)
Root Outline
The outline are nearly straight from the cervical line to the
middle 1/3 then tapered to a pointed apex
Surface
anatomy
of the
crown
and root
The crownhave smooth and convex proximal surfaces
Mesial contact area is in the centre of incisal 1/3
Distal contact area is in the junction of middle and
incisal 1/3
The Rootis smooth but have longitudinal developmental
depressions which is deeper distally than mesially.
8/10/2019 Mandibular Permanent Lateral Incisor
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4Mandibular Permanent Lateral Incisor
Occlusal Geometric
outline of
the crown
Diamond shaped
Labiolingual dimension is greater than the
mesiodistal dimension
Outlinesof the
crown
and root
Crown OutlineConvex labially and tapers lingually due to
lingual convergence.
Root Outline
can not be seen from this view
Surface
anatomy
of the
crown
and root
Elevations
Cingulum is twisted distally, found
lingually
Incisal ridge
Incisal edge is sloping distally
Cervical ridge found labially Mesial and Distal Marginal ridge
Depressions
Lingual fossa