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Lectures on Dental Anatomy
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BASIM ZWAIN LECTURESDENTAL ANATOMY
PERMANENT MAXILLARY LATERAL INCISORS
Professor Dr. Basim ZwainFaculty of DentistryUniversity of Kufa
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MAXILLARY LATERAL INCISORS
It resembles the maxillary central incisor in function, form, and anatomy. It is generally smaller in all dimensions except the length of its root (recall my presentation of maxillary central incisors) Crown is more rounded, shorter and narrower mesiodistally than the max. central incisor.
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Principal identifying features
Mesioincisal angle is acute, and distoincisal angle is more rounded.
Single root with tapered, curved and distally pointed apex.
Lingual fossa is more concave than that of max. central incisor.
MAXILLARY LATERAL INCISORS
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Labial aspect The crown is shorter, and narrower than the max. central incisor but the root is as long or longer than it. The labial surface of the crown is more convex than the max. central incisor. The mesial outline resembles the max. central incisor with more rounded mesioincisal angle, and crest of curvature between middle and incisal thirds. The distal outline is more rounded, and the crest of curvature is at the center of the middle third.
MAXILLARY LATERAL INCISORS
The root tapers evenly and curves distally at the apex.
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Lingual aspect The mesial and distal marginal ridges, and the lingual portion of the incisal ridge are well marked, with a more concaved lingual fossa. A prominent cingulum with a tendency toward seeing a deep developmental groove within the lingual fossa.
MAXILLARY LATERAL INCISORS
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Mesial aspect The crown labiolingually is narrower than the max. central incisor. The curvature of the cervical line is less than the max. central incisor. The root appears as a tapered cone, and a line bisecting the root bisects the incisal ridge of the crown, which is well developed.
MAXILLARY LATERAL INCISORS
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Distal aspect
The curvature of the cervical line is less than mesially.
It is not uncommon to find a developmental groove extending to the root.
MAXILLARY LATERAL INCISORS
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Incisal aspect The incisal aspect resembles that of the max. central incisor but:
Cingulum and incisal ridge may be large.
Labialingual to mesiodistal measurement is larger than in central incisor (resembling a small canine).
MAXILLARY LATERAL INCISORS
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Variations Peg shaped lateral with a thin root and small conical crown (pointed).
The max. lateral incisor may be missing.
Large pointed tubercle as part of the cingulum.
Deep developmental groove on distal aspect extending to the root.
MAXILLARY LATERAL INCISORS
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Thank you
