Incisors Ver2

7/31/2019 Incisors Ver2

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Tooth Morphology

Crown & Bridge

Stage 3

Construct Crown & Bridge Structures 510B Ver2

Incisors


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Important NoteAll notes for todays lesson can be found in your

anatomy text book purchased in Stage 1:-

Anatomy of Orofacial Structures

Authors: Brand & Isselhard

All page numbers are from the 7th Edition


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Outcomes for TodayAt the end of todays session you should

be able to:-

Identify and describe Maxillary Incisors

Identify and describe Mandibular Incisors


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Teeth begin to develop in the alveolar process during

the sixth week of fetal life. A tiny tooth bud forms

(tooth germ) where four or more growth centers are

present. From these growth centers developmental

lobes are formed. These lobes grow and develop

until they fuse together to form a tooth.

Incisors


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Incisors

Incisors have four lobes

Three on labial surface of a tooth

One on the lingual surface of a tooth


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Incisors

The three labial lobes fuse together to form thelabial surface and incisal ridge. The labiallobes are named according to location:-

Mesiofacial

Centrofacial

Distofacial

The lingual lobe makes up the Cingulum on thelingual surface of the tooth


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The permanent dentition has eight incisorsin total:-

Four in the maxillary arch

Four in the mandibular arch

Each arch contains two Central Incisors andtwo Lateral Incisors

Incisors


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Maxillary Incisors

Central Incisor

&

Lateral Incisor


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Central Incisor

Facial View Generally has a smooth enamel

surface

The distance between the mesialand distal surfaces is the widest ofall anterior teeth

Usually looks symmetrical inshape

Generally has a straight incisaledge


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Central Incisor

Facial View

The distal marginal ridge is morecurved than the mesial marginal

ridge and generally appears fairlystraight in outline

Mesioincisal corner is

relatively sharp compared todistoincisal corner which isgenerally rounder.


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Mesial and Distal View

Incisal ridge bisects thecentre of the root

The labial is slightly convexbulging out from the cervicalline or CementoenamelJunction (CEJ)

The peak of the labialconvexity is one third the waydown the from the cervical

line

Central Incisor

Mesial Distal


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Central Incisor

Lingual View

Distinct lingual marginalridges

Prominent cingulum

Broad lingual fossa


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Lateral Incisor

Facial View

The Lateral Incisor is a smallerand more rounded version ofthe Central Incisor


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Lateral Incisor


Labial surface is moreconvex than the CentralIncisor

Mesial and distal aspectsare triangular in shape

Mesial Distal


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Lateral Incisor

Lingual View

Lingual features are similarto the Central Incisor butare more highly developed

Lingual surface has a deepfossa and often a lingual pit


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Lateral Incisor

Occlusal View

Incisal features are

triangular in shape with avery clear incisal ridge thatslopes lingually

C


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Maxillary Central Incisor Maxillary Lateral Incisor

Facial Lingual

Incisal

Mesial Distal

Facial Lingual

Incisal

Mesial Distal


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Mandibular Incisors

Central Incisor

&

Lateral Incisor


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Central Incisor

Labial View

Smallest teeth in the mouth

Mesioincisal and distoincisalcorners are nearly identical


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Central Incisor


Incisal edge tends towards

the lingual half of the tooth

Minimal differencebetween the amount

cervical curvature

Mesial Distal


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Central Incisor

Lingual View

Lingual surface is shallowand has no prominentfeatures


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Central Incisor

Occlusal View

Incisal edge often showswear on the labioincisaledge

Triangular in shape

Cingulum much small thanthe maxillary incisors


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Lateral Incisor

Labial View

Wider mesiodistally thanMandibular Central Incisor

Mesioincisal corner is sharperthan the distoincisal corner

Distal lobe is more developedthan the mesial lobe


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Lateral Incisor

Mesial and distal View

Larger version of theMandibular Central Incisorwith greater labial contour

Incisal edge tends towards

the lingual half of the tooth

Mesial Distal


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Lateral Incisor

Lingual View

Lingual fossa is very shallow


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Lateral Incisor

Occlusal View

Cingulum much small thanthe Maxillary Incisors

Triangular in shape butmore rounded looking thanthe Mandibular Central


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Mandibular Central Incisors Mandibular Lateral Incisors

Mesial Distal

Facial

Incisal

Lingual Facial Lingual

Incisal

Mesial Distal


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Outcomes achievedYou should be able to:-

Identify and describe Maxillary Incisors

Identify and describe Mandibular Incisors

Incisors Ver2

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