Dental Anatomy: Maxillary Lateral Incisor

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Questions and Answers

What is the shape of the apex of the root of the maxillary lateral incisor?

Pointed

Threaded

Rounded

Blunt (correct)

What is the characteristic of the mesial outline of the maxillary lateral incisor?

Slightly convex with a crest of curvature near the mesio-incisal angle (correct)

Similar to the maxillary central incisor

More convex than distal outline

Straight with no curvature

What is the characteristic of the distal outline of the maxillary lateral incisor?

Slightly rounded with no crest of curvature

Less convex than mesial outline with the crest of curvature at the junction between incisal and middle thirds

More convex than mesial outline with the crest of curvature at the center of the middle third (correct)

Straight with no curvature

What is the characteristic of the crown of the maxillary lateral incisor in the labio-lingual direction?

Wider with a pronounced curvature of the cervical line Signup and view all the answers

What is the characteristic of the lingual aspect of the maxillary lateral incisor?

Well defined lingual anatomical features Signup and view all the answers

Is there a developmental groove extending from the cingulum to the root in the maxillary lateral incisor?

No Signup and view all the answers

What is the characteristic of the lingual fossa of a maxillary lateral incisor?

It is more concave and circumscribed than that of a maxillary central incisor. Signup and view all the answers

What is unique about the root of a maxillary lateral incisor?

It appears as a tapered cone. Signup and view all the answers

What is a common variation of the maxillary lateral incisor?

A peg-shaped lateral incisor. Signup and view all the answers

What is true about the incisal aspect of a maxillary lateral incisor?

It resembles that of a maxillary central incisor. Signup and view all the answers

What is a difference between the maxillary central incisor and the maxillary lateral incisor?

The maxillary central incisor is longer and wider than the maxillary lateral incisor. Signup and view all the answers

What is a characteristic of the curvature of the cervical line of a maxillary lateral incisor?

It is less pronounced than that of a maxillary central incisor. Signup and view all the answers

What is a unique feature of the developmental groove of a maxillary lateral incisor?

It is typically found on the distal side and may extend to the root. Signup and view all the answers

What is true about the congenital absence of maxillary lateral incisors?

It is a rare occurrence. Signup and view all the answers

What is the main function of the maxillary lateral incisor?

To supplement the maxillary central incisor in function Signup and view all the answers

What is the characteristic of the crown of the maxillary lateral incisor compared to the maxillary central incisor?

It is more rounded, shorter and narrower mesio-distally Signup and view all the answers

What is the characteristic of the root of the maxillary lateral incisor?

It is as long as the maxillary central incisor but not as thick Signup and view all the answers

What is the characteristic of the mesio-incisal angle of the maxillary lateral incisor?

It is acute and the disto-incisal angle is more rounded Signup and view all the answers

What is the characteristic of the lingual fossa of the maxillary lateral incisor?

It is more concave than that of the maxillary central incisor Signup and view all the answers

What is the characteristic of the labial surface of the crown of the maxillary lateral incisor?

It is more convex than that of the maxillary central incisor Signup and view all the answers

What is the characteristic of the root of the maxillary lateral incisor in the labial aspect?

It tapers evenly and curves distally at the apex Signup and view all the answers

What is the characteristic of the cingulum of the maxillary lateral incisor in the lingual aspect?

It is usually prominent with a tendency toward deep developmental grooves Signup and view all the answers

Study Notes

Maxillary Lateral Incisor

Located second from the median line, supplements the maxillary central incisor in function
Smaller than the maxillary central incisor in all dimensions except root length
Root is usually as long as the maxillary central incisor, but not as thick

Principle Identifying Features

Crown is more rounded, shorter, and narrower mesio-distally than the maxillary central incisor
Mesio-incisal angle is acute and disto-incisal angle is more rounded
Single root with a tapered, distally curved, pointed apex
Lingual fossa is more concave than that of the maxillary central incisor

Labial Aspect

Crown is shorter and narrower than the maxillary central incisor, but root is as long or longer
Labial surface of the crown is more convex than that of the maxillary central incisor
Mesial outline resembles that of the maxillary central incisor with a more rounded mesio-incisal angle
Distal outline is more rounded with the crest of curvature at the center of the middle third
Root tapers evenly and curves distally at the apex

Lingual Aspect

Mesial and distal marginal ridges are marked
Cingulum is usually prominent with a tendency towards deep developmental grooves within the lingual fossa
Lingual fossa is more concave and circumscribed than that found on the maxillary central incisor
Tooth tapers towards the lingual resembling a maxillary central incisor
Deep developmental groove at the side of the cingulum, usually on the distal side, may extend up on the root

Mesial Aspect

Crown is narrower labio-lingually than the maxillary central incisor
Curvature of the cervical line is less than that of the maxillary central incisor
Root appears as a tapered cone, and a line bisecting the root bisects the incisal ridge, which is well developed

Distal Aspect

Curvature of the cervical line distally is less than that mesially
Developmental groove extending to the root may be present

Incisal Aspect

Resembles the maxillary central incisor, but with a larger cingulum and incisal ridge
Labio-lingual to mesio-distal measurement is larger, resembling a small canine
Exhibits more convexity labially and lingually

Variations from the Typical Form (Anomalies)

Peg-shaped lateral incisor with a thin root and small conical crown
May be congenitally missing
Large developmental groove on the palatal aspect extending to the root (palatogingival groove, palatoradicular groove)

Main Differences between Maxillary Central and Lateral Incisor

Crown size and shape: maxillary central incisor is longer and wider, while maxillary lateral incisor is shorter and narrower
Root size and shape: maxillary central incisor is shorter with a cone-shaped blunt apex, while maxillary lateral incisor is longer with a tapered, pointed apex

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Description

Learn about the maxillary lateral incisor, its function and characteristics in this dental anatomy quiz.