Permanent Incisors Overview

Questions and Answers

What is a notable characteristic of the upper central incisor compared to the upper lateral incisor?

It has a curved incisal edge.

It often has a palatal pit present.

The incisal edge is straight with sharp mesioincisal angles. (correct)

The root apex is pointed and distally curved.

How do deciduous incisors differ from their permanent successors in terms of size?

Deciduous incisors are larger than permanent incisors.

Deciduous incisors are the same size as permanent incisors.

Deciduous incisors vary widely in size compared to permanent ones.

Deciduous incisors are smaller than permanent incisors. (correct)

Which statement correctly describes the incisal edge of lower central incisors?

The cingulum is shifted mesially.

The incisal ridge is at right angles to the labiolingual axis. (correct)

The incisal edge has a pronounced distolingual twist.

The incisal ridge is tilted mesially.

Which feature is typically found on upper deciduous incisors that is not seen on permanent incisors?

<p>Bulbous crown.</p> Signup and view all the answers

What distinguishes the orientation of the incisal edge in lower deciduous incisors compared to permanent ones?

<p>Incisal edge is centered on the root.</p> Signup and view all the answers

Study Notes

Permanent Incisors

Upper central incisors are larger and wider than upper lateral incisors.
Lower lateral incisors are wider than lower central incisors.
Upper central incisors features:
- Wide with a straight incisal edge.
- Mesial-incisal (M.I) angle is sharp; distal-incisal (D.I) angle is rounded.
- Lacks a palatal pit.
- Blunt, centralized root apex.
Upper lateral incisors features:
- Narrower than upper centrals with a curved incisal edge.
- Both M.I and D.I angles are rounded.
- Palatal pit may be present sometimes.
- Pointed and distally curved root apex.

Lower Incisors

Lower central incisors characteristics:
- Incisal ridge oriented at right angles to the labiolingual axis.
- Centralized cingulum.
- Crown twisted distolingually with incisal ridge tilted distally.
Lower lateral incisors have a distally shifted cingulum.

Differences Between Permanent and Deciduous Anteriors

Deciduous teeth are smaller and whiter than permanent teeth.
Deciduous incisors have a constricted cervix with enamel bulges near cervical lines, and bulbous crowns.
Surface features of deciduous incisors are smoother with shallow elevations and depressions.

Upper Deciduous Incisors

Wider in relation to crown length compared to permanent incisors.
Lack mamelons, giving them a smooth appearance.
Thicker relative to crown length with prominent labial and lingual crests of curvature.

Lower Deciduous Incisors

Incisal edge is centered on the root, unlike the lingually inclined position of permanent incisors.
In lower deciduous incisors, the incisal edge is inclined distally and the cingulum is shifted distally.

Description

This quiz explores the characteristics of permanent incisors, focusing on their anatomy, differences between upper and lower incisors, and specific features that distinguish each type. Understand the unique attributes and alignments of both central and lateral incisors.