Lectures on Dental Anatomy

1. BASIM ZWAIN LECTURES
DENTAL ANATOMY
PERMANENT MAXILLARY INCISORS
Professor Dr. Basim Zwain
Faculty of Dentistry
University of Kufa
Basim.zwayen@uokufa.edu.iq

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PERMANENT MAXILLARY INCISORS
Characteristic features of incisors’ crowns
1- Incisal ridge and edge.
2- Mamelons.
3- Position of the marginal ridges.
4- Lingual fossa and cingulum.

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Principal identifying features
1- The widest anterior tooth mesiodistally.
2- Squared or rectangular.
3- Straight mesial and rounded distal
outline.
4- Sharp mesial and rounded distal incisal
angle.
5- Mamelons in newly erupted incisors.
6- Well marked marginal ridges, lingual
fossa, and cingulum.
MAXILLARY CENTRAL INCISOR

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Labial aspect
The mesial outline is slightly convex with a crest of
curvature near the mesioincisal angle.
The distal outline is more convex than mesial outline, with
crest of curvature at the junction between incisal and
middle third.
The incisal outline in newly erupted teeth has elevation
called the mamelons, but with age the mamelons wear and a
regular and straight incisal outline is seen.
MAXILLARY CENTRAL INCISOR

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MAXILLARY CENTRAL INCISOR
Labial aspect
The cervical outline is semicircular in shape with the
curvature rootwise.
The root is cone shaped with a blunt apex. It is 2-3mm
longer than the crown.
The labial surface is a broad flattened convexity divided
vertically by 2 shallow developmental depressions.

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MAXILLARY CENTRAL INCISOR
Lingual Aspect
The crown and root taper lingually, therefore the mesiodistal
dimension of the lingual surface is narrower than of the labial
surface.
Below the cervical line there is a smooth convexity called
the cingulum, which is confluent with raised marginal ridges,
mesially and distally.
Between the lingual portion of the incisal ridge, the mesial
and distal marginal ridges and the cingulum, is a shallow
concavity called the lingual fossa.

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MAXILLARY CENTRAL INCISOR
Mesial Aspect
The crown is triangular in shape, with the base of the
triangle at the cervix, and the apex at the incisal ridge.
A line which bisects the outline of the crown will bisect the
root.
The labial outline of the crown is slightly convex.
The lingual outline of the crown is convex at the cingulum,
then becomes concave at the mesial marginal ridge, and then
slightly convex at the incisal ridge.
The cervical line curves incisally more than any surface on
any tooth. The curvature is about 3-4mm.

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MAXILLARY CENTRAL INCISOR
Distal Aspect
The curvature of the cervical line is less distally than
mesially.
M D

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MAXILLARY CENTRAL INCISOR
Incisal Aspect
The incisal ridge is centered
over the root.
The labial outline of the crown
is broad and flat convex.
The incisal edge and incisal
ridge are well defined.
Tapers lingually to cingulum.
Labial mesiodistal dimension
is greater than lingual.
D M

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Thank you