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Questions and Answers

Match the following features of the maxillary lateral incisor with their descriptions:

Smaller in size = Differs from upper central incisor Trapezoid in shape = Geometric outline of the labial aspect Rounded mesio-incisal angle = Incisal outline not straight Cervical ridge = Maximum convexity at the cervical third

Match the following developmental milestones of the maxillary lateral incisor with their ages:

Appearance of dental organ = 5 months First evidence of calcification = 10-12 months Crown completed = 5-6 years Root completed = 11-12 years

Match the following functions of the maxillary lateral incisor:

Cutting food = Primary function Speech = Functional role Support for lips = Aesthetic importance Supplements central incisor = Functional support

Match the following anatomical features of the root with their characteristics:

Root tapers gradually = Towards apical third Apex is pointed = Sharper than upper central incisor Root length = Same length or longer than upper central Distal curvature = Curves distally at the apex Signup and view all the answers

Match the following aspects of the labial surface anatomy:

Developmental grooves = Two separate lobes Mamelons = Three in number Convexity = Height of contour at cervical third Distal outline = More convex than mesial outline Signup and view all the answers

Match the following characteristics with the corresponding types of maxillary incisors:

Upper Central Incisor = Longest crown of all human teeth Upper Lateral Incisor = Crown is smaller in all dimensions than central incisor Root of Upper Central Incisor = Cone shaped with centralized apex Root of Upper Lateral Incisor = Root tapers to a pointed apex Signup and view all the answers

Match the following aspects with their descriptions:

Mesial Aspect = Labial outline is convex with maximum convexity at cervical third Distal Aspect = Cervical line is shallower than mesial aspect Incisal Aspect = Triangular shape but smaller in size for lateral incisor Labial Aspect = Similar outline to the labial surface with lingual convergence Signup and view all the answers

Match the following features with their corresponding anatomical outlines:

Pulp Cavity of Upper Central Incisor = Wider pulp chamber conforming to the shape of the crown Pulp Cavity of Upper Lateral Incisor = Tapers towards the apex with three pulp horns Cervical Line Curvature of Mesial Aspect = Concave toward the root Geometric Outline of Distal Aspect = Similar to mesial aspect but with developmental groove present Signup and view all the answers

Match the following clinical considerations with their features:

Congenitally Missing Lateral Incisor = Absence of the lateral incisor Peg Lateral Incisor = Formed of two lobes due to missing middle lobe Lingual Pit = Fault pit enclosed by the cingulum Lingual Groove = Extends from the lingual pit and may go over the cervical line Signup and view all the answers

Match the following contact areas with their locations:

Mesial Contact Area of Upper Central Incisor = At the incisal third near the mesio-incisal angle Distal Contact Area of Upper Lateral Incisor = At the center of the middle third Mesial Contact Area of Upper Lateral Incisor = Near or at the junction of incisal & middle thirds Distal Contact Area of Upper Central Incisor = At the junction of incisal and middle thirds Signup and view all the answers

Study Notes

Maxillary Lateral Incisor

Number: Two
Contact: Mesial side contacts the maxillary central incisor, distal side contacts the maxillary canine.
Function: Cutting food, speech, and support for lips; supplements central incisor function.
General Characteristics: Similar to the upper central incisor but smaller, more rounded, and with a root length similar to or potentially longer.

Chronology of Development

Dental Organ Appearance: 5 months
Calcification: 10-12 months
Crown Completion: 5-6 years
Eruption: 8-9 years
Root Completion: 11-12 years

Labial Aspect

Geometric Outline: Trapezoid, short side is cervical, long side is incisal.
Mesial Outline: Convex, more so than the upper central incisor, contact area at the junction of incisal and middle thirds.
Distal Outline: More convex than the mesial outline; contact area at the middle third.
Incisal Outline: Not straight, rounded mesio-incisal and disto-incisal angles (more rounded than the mesio-incisal angle of a central incisor).
Cervical Line: Convex toward the root.
Elevations in Surface Anatomy: Labial surface is convex, maximum convexity at the cervical third (cervical ridge). Three mamelons in newly erupted teeth.
Depressions in Surface Anatomy: Two developmental grooves separate three lobes (mesio-labial and disto-labial developmental grooves).

Root

Tapering: Labial and lingual outlines taper gradually to the apical third where it curves distally.
Apex: More pointed (sharp) than the upper central incisor.

Crown

Broadest Anterior Teeth: The broadest of the anterior teeth.
Longest Crown: The longest crown of all human teeth
Dimensions: Crown is smaller than the central incisor in dimensions except the root.

Mesial Aspect

Contact Area: At the junction of incisal and middle thirds.
Cervical Line Curvature: Concave toward the root
Root Apex: Centralized with a pointed end.
Line Bisecting: Tooth passes from the root apex to the incisal ridge.
Crown: Crown is long, large
Contact Area: At I 1/3 near the M I angle

Distal Aspect

- Similar to mesial: Similar to the mesial aspect except for the following features.
Cervical Line: Shallower.
Depression: Developmental grooves (depression) on root.
Contact Area: Middle third.
Distal Contact Area: At the center of the crown.

Incisal Aspect

Similar to Upper Central: Similar to the upper central incisor, but smaller in size.
Meso-distal and Labiolingual Dimensions: Mesio-distal dimension is nearly equal to the labiolingual dimension.
Labiolingual Dimension: Labiolingual dimension is thicker than the upper central incisor due to a well-developed cingulum and cervical ridge.
Palatal Pit: When present, located between the cingulum and lingual fossa.

Incisal Aspect (Geometric Outline)

Geometric Outline: Triangular (but smaller than central).
M-D vs Lab-Ling: M-D dimension is greater than Lab-Ling.
Outlines: Labial and lingual outlines are rounded (due to well-developed cervical ridge and cingulum).

Pulp Cavity

Similarities/Differences to Central Incisor: Similar to the central incisor, but smaller.
Pulp Chamber (Mesio-distal Section): Wide, conforming to the shape of the crown (trapezoid). Three pulp horns corresponding to the three mamelons.

Pulp Cavity (Labio-Lingual Section)

- Pointed Incisally: Pointed incisally, then follows an increase in dimension cervically (until the cervical line level).
Root Canal: Tapers gradually; ends in a constriction at the root apex (apical foramen).