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Mandibular Incisors - Operative Dentistry - Lecture Slides, Slides of Dental surgery

Mandibular Incisors, Labial Aspect, Permanent Teeth, Lingual Aspect, Incisal Edge, Cervical Line, Mesial Aspect, Labiolingual Diameter, Deflection of Root, Mandibular Arch. Exact name of subject is Operative Dentistry. I have 24 lectures, each one has own main topic.

Typology: Slides

2011/2012

Uploaded on 12/13/2012

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Mandibular Incisors

Introduction

Mandibular incisors are four in number

Mandibular central incisor and lateral are similar in anatomy and complement each other in function

They are smaller than the maxillary incisors

Mandibular central incisor erupts between the age of 6 and 7

Mandibular lateral incisor erupts between the age of 6 and 8

Lingual aspect

 The lingual aspect is concave from the incisal edge to the cervical line

 Cingulum is smooth and barely visible

 The surface is smooth and devoid of any grooves. No other tooth in the mouth, except the mandibular lateral incisor, shows so few developmental lines and grooves.

Mesial aspect

 The labial outline is almost straight, except near cervical third where it is convex

 The lingual margin is ‘S’ shaped

 The cervical line on the mesial and distal surface is convex incisally

Root

The root is single and straight.

 The deflection of the root if present is on the labial or

distal side.

9.0 12.5 5.0 3.5 6.0 5.3 3.0 2.

Curvature ofCervical Line M D

Labiolingual Diameter at Cervical Line

Labiolingual Diameter at Crest of Curvature

Mesiodistal Diameter at Cervical Line

Mesiodistal Diameter at Contact Area

CrownLength Root Length

Average Dimensions in millimeters

Mandibular Lateral Incisor

 Mandibular lateral incisor is slightly wider mesiodistally

 The concavity in the lingual aspect is slightly more when compared to mandibular central incisor

 The cervical portion of the lingual aspect is narrower while the incisal portion is wider. This gives the crown a more or less a fan shaped appearance

 The incisal edge follows the mandibular arch, giving the crown a slightly twisted appearance on its root