22 Questions
What is the shape of the apex of the root of the maxillary lateral incisor?
Blunt
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
What is the characteristic of the distal outline of the maxillary lateral incisor?
More convex than mesial outline with the crest of curvature at the center of the middle third
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
What is the characteristic of the lingual aspect of the maxillary lateral incisor?
Well defined lingual anatomical features
Is there a developmental groove extending from the cingulum to the root in the maxillary lateral incisor?
No
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.
What is unique about the root of a maxillary lateral incisor?
It appears as a tapered cone.
What is a common variation of the maxillary lateral incisor?
A peg-shaped lateral incisor.
What is true about the incisal aspect of a maxillary lateral incisor?
It resembles that of a maxillary central incisor.
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.
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.
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.
What is true about the congenital absence of maxillary lateral incisors?
It is a rare occurrence.
What is the main function of the maxillary lateral incisor?
To supplement the maxillary central incisor in function
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
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
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
What is the characteristic of the lingual fossa of the maxillary lateral incisor?
It is more concave than that of the maxillary central incisor
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
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
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
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
Learn about the maxillary lateral incisor, its function and characteristics in this dental anatomy quiz.
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