incisors ver2
TRANSCRIPT
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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
Mesial and Distal View
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
Mesial and Distal View
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