Human Incisors: Maxillary & Mandibular

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Questions and Answers

Which of the following is a key characteristic that differentiates the permanent mandibular lateral incisor from the permanent mandibular central incisor?

The lateral incisor has a less symmetrical incisal edge with an oblique orientation, whereas the central incisor's incisal edge is more symmetrical. (correct)
The root of the central incisor is more flattened mesiodistally compared to the lateral incisor's root.
The lateral incisor exhibits a symmetrical crown, while the central incisor's crown is less symmetrical
The cingulum is more distinct in the lateral incisor than in the central incisor

Unlike permanent maxillary central incisors, what specific feature is observed in deciduous maxillary central incisors?

Poorly defined marginal ridges (correct)
Absence of a cingulum
A disto-incisal corner that is sharply angled
Presence of mamelons and labial lobe grooves

What is the key distinguishing feature between a permanent maxillary lateral incisor and a permanent maxillary central incisor?

The lateral incisor is wider mesiodistally compared to the central incisor.
The mesial surface of the crown in the lateral incisor is less angulated from the root surface than in the central incisor.
The disto-incisal corner is more rounded in the lateral incisor compared to the central incisor. (correct)
The central incisor’s root is longer relative to the crown compared to the lateral incisor.

How do deciduous mandibular central incisors differ from their permanent counterparts in terms of labial surface?

Deciduous incisors feature indistinct palatal cingulum. (C) Signup and view all the answers

Which characteristic is unique to the root of a permanent maxillary lateral incisor compared to a permanent maxillary central incisor?

The lateral incisor's root is longer relative to its crown length. (C) Signup and view all the answers

Which mesio-incisal and disto-incisal angle characteristic is observed in deciduous maxillary lateral incisors?

The mesio-incisal angle is more acute, and the disto-incisal angle is more rounded. (D) Signup and view all the answers

How does the crown of a permanent mandibular central incisor differ from that of a permanent maxillary central incisor?

The mandibular incisor's crown is symmetrical. (C) Signup and view all the answers

When comparing the permanent mandibular lateral incisor to the permanent mandibular central incisor, which statement accurately describes a notable difference in their incisal edges?

The lateral incisor's incisal edge is less symmetrical and exhibits an oblique orientation. (C) Signup and view all the answers

What is a distinctive characteristic of permanent mandibular incisors compared to permanent maxillary incisors?

Mandibular incisors often exhibit a lingually tilted crown. (C) Signup and view all the answers

How does the appearance of deciduous maxillary central incisors compare to permanent maxillary central incisors?

Deciduous incisors appear 'plumper' and are similar to permanent incisors. (C) Signup and view all the answers

Flashcards

Maxillary 1st (central) incisor

Widest incisor mesiodistally; wedge-shaped with palatal cingulum and well-defined marginal ridges; mesial surface of crown less angulated from root surface; disto-incisal corner rounded; crown length equals root length; 3 mamelons; labial lobe grooves.

Maxillary 2nd (lateral) incisor

Less wide mesiodistally; wedge shaped with well-defined marginal ridges and a foramen caecum near cingulum; mesial surface of crown less angulated from root surface; disto-incisal corner rounded; longer root relative to crown length.

Mandibular 1st (central) incisor

Symmetrical crown, wedge-shaped, crown lingually tilted with a less distinct cingulum and a root more flattened mesiodistally.

Mandibular 2nd (lateral) incisor

Compared with lower 1st incisor: Less symmetrical with incisal edge having oblique orientation and distal surface diverging from tooth’s long axis (fan-shaped incisor).