Download 13- maxillary lateral incisor

Lecture 2
Dental Anatomy
Dr. Sattar Hmadat
maxillary lateral incisor
The maxillary lateral incisor supplements the central incisor in function, close
resemblance, but the lateral incisor is smaller in all dimensions except root length.
Labial Aspect
*The crown is smaller in all dimensions to those of the central lncisor.
*The crest of contour mesially is usually at the point of junction of the middle and
incisal thirds occasionally, in the so-called square forms, the mesioincisal angle is
almost rounded.
*The distal outline is always more rounded, and the crest of contour is more cervical,
usually in the center of the middle third. Some forms describe a semicircular outline
distally from the cervix to the center of the incisal ridge.
*This tooth is relatively average measures from 2 to 3 mm narrower mesiodistally,
and shorter cervicoincisally than that of the central incisor.
*The root length is greater in proportion to its crown length than that of the central
incisor. The root is often about 1.5 times the length of the crown.
*In most cases the apex curves in a distal direction and ends in a pointed.
Labial Aspect
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Lecture 2
Dental Anatomy
Dr. Sattar Hmadat
Lingual Aspect
*The mesial and distal marginal marginal ridges are marked, and the cingulum is
usually prominent, with a tendency toward deep developmental grooves within the
lingual fossa usually on the distal side which may extend up on the root for part or all
of its length.
*The lingual fossa is more concave and circumscribed than that found on the central
incisor.
Lingual Aspect
Mesial Aspect
*The mesial aspect is similar to that of a small central-incisor, except the root longer.
*The curvature of the cervical line is marked in the incisal direction.
*The Incisal ridge heavy development of incisal portion appear somewhat thicker
than that of the central incisor.
*The root appears as a tapered cone from this aspect, with a Bluntly rounded apex. a
line drawn through the center of the root tends to bisect the incisal ridge of the crown.
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Lecture 2
Dental Anatomy
Dr. Sattar Hmadat
Mesial Aspect
Distal Aspect
*The width of the crown distally appears thicker than it does on the mesial aspect.
*The curvature of the cervical line is less in depth than on the mesial aspect.
Distal Aspect
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Lecture 2
Dental Anatomy
Dr. Sattar Hmadat
Incisal Aspect
*The incisal aspect of this tooth sometimes resembles that of the central incisor or it
may resemble that of a small canine.
*AII maxillary lateral incisors .exhibit more convexity labially and lingually from the
incisal aspect than do the maxillary central incisors.
incisal aspect
Variations from the typical form (Anomalies)
1- Peg-shaped lateral incisor, with a thin root and a small conical crown.
2- The maxillary lateral incisor may be congenitally missing.
3- Large developmental groove on the distal aspect extending to the root.
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Lecture 2
Dental Anatomy
Dr. Sattar Hmadat
Mandibular Lateral Incisor
Principle identifying features
1- Slightly larger than mandibular central incisors with fan shaped crown.
2- The crown is slightly longer, but the root is considerably longer than the mandibular
central incisors.
3-The mesial side of the crown is longer than the distal side,
causing the incisal ridge to slope downward in a distal direction.
4- The distal contact area is more towards the cervical area than
the mesial contact area.
5- Faint marginal ridges but more prominent than that in
manibular central incisors.
6-The incisal edge is twisted distally in a lingual direction to follow the curvature of
the lower arch.
7- There are mesial and distal developmental depressions on the root.
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Lecture 2
Dental Anatomy
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Dr. Sattar Hmadat