Maxillary & Mandibular Canines

8/12/2019 Maxillary & Mandibular Canines

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PERMANENT

CANINES


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INTRODUCTION

Totally 4 in no.,1 per quadrant

3rdTooth from midline

Maxillary & mandibular canines- resemble each other

Functions are closely related

Referred to as Corner Stone of the dental arch

Longest teeth in the mouth

Crowns are as long as those of maxillary central incisors

Longest roots


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Cuspids- Middle labial lobes have been highly developed incisally

into strong well- formed cusps , hence the name.

Crowns and roots markedly convex on most surfaces

Features :

Self cleansing property

Efficient anchorage

Most stable teeth in the mouth , therefore , are the last teeth to

be lost


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Canine:Resemblesprehensileteeth of the carnivores

Canine eminence ~ Cosmetic value

~ Maintenance of natural facial

expression

Function : Supports that of the incisors and premolars


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Maxillary Canine

Introduction:

Labial and lingual aspect is a series of curves or arcs

Mesial half makes contact with the lateral incisor

Distal half makes contact with the first premolar

Contact areas are at different levels cervicoincisally

Labial view : mesial half resembles a portion of lateral incisor

: distal half resembles a premolar


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Labiolingual measurement of the crown is about 1mm greater

than that of maxillary central incisor.

Mesiodistal measurement is approx 1mm less

Cingulum shows greater development than that of central incisor

Root is thick labiolingually with development depressions

mesially and distally( anchorage)


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ADA / Universal - 6 , 11

FDI - 1 3 , 2 3

ZsigmondyPalmar 3 3

First evidence of Calcification 4 - 5 months

Enamel Completion 6 - 7 yrs

Eruption 11 - 12 yrs

Root completion 13 - 15 yrs


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Dimensions : in mm

Crown Length 10 . 0

Root length 17 . 0

M - d dm 7 . 5

M - d (At cervix) 5 . 5

L - l dm 8 . 0

L - l (At cervix) -- 7. 0

Curvature of cervical line mesially 2 . 5

Curvature of cervical line distally 1 . 5


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Labial aspect

Crown and root narrower mesiodistally than those of the Maxillary CI ( by 1mm)

Cervical line is convex, with convexity towards the root apex

Mesial outline of the crown : convex from the cervix to the centre of the

Mesial Contact Area (MCA)

MCA :Approximately - the junction of middle and incisal thirds of the crown

Distaloutline of crown : usually concave between the cervical line

and the Distal Contact Area (DCA)

DCA :Is at the centre of the middle third of the crown


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Labial aspect


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Cusptip is on a line with the centre of the root

Cusp has Mesial & Distal slopes, mesial slope being shorter of the two

Both slopes show slight concavity till they are worn out

Labial surface of the crown is smooth, with no developmental lines

Shallow depressions mesially and distally ,divide the three labial lobes

Middle labial lobe shows great development , into a pointed cusp.


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There is a prominent labial ridge.

Line drawn on this ridge from cervix to cusp tip is curved

- with inclination mesial ly

Areas Mesial to this line are convex

Distal to this line, concavity is seen in cervical third ,

convexity in middle & incisal thirds.

Root: Slender & Conical with a bluntly pointed apex

Apical third may show mesial / distal curvature

Labial surface of the root is smooth and convex at all points


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Lingual aspect

The crown and root are narrower lingually than labially

Cervical line shows a more even curvature

Cingulum is large , & in some instances pointed like a small cusp

A well developed lingual ridge confluent with the cusp tip, this

extends to a point near the cingulum

Mesial and distal lingual fossae - shallow concavities between this

ridge & marginal ridges

Developmental depressions may be seenmesially and distally on

most of the roots, extending most of the root length


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Lingual aspect


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Mesial aspect

Presents the outline of the functional form of an anterior tooth

Shows more bulk and greater L-l measurement than incisors

Outline is wedge shaped, greatest measurement at the cervical 3rd

Crest of curvature at a level more incisally

Cervical thirdshows a flattened area labially

Below cervical third labial outline appears only as slightly convex

from crest of curvature to cusp tip .

Entire labial outline is more convex than CI


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Lingual outline : Convexity - describing cingulum,

Straight - at the middle third

Convex - again in the incisal third

Cervical line : Convexity - towards the cusp ( ~ 2.5mm at the CEJ)

RootOutline : Conical with a tapered or bluntly pointed apex

Root may curve labial ly toward the apical third

Labial outline may be almost perpendicular, with most of the taper

appearing on the lingual side

Line bisecting cusp tip is labial to line bisecting root

Mesial surface of the root appears broad, with a shallow developmental

depression for part of the root length


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Mesial aspect


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Distal aspect

Same form as the mesial aspect

The cervical line exhibits less curvature towards the cusp ridge

Distal marginal ridge heavier & irregular in outline

Developmental depression more pronounced


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Distal aspect


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Incisal aspect

Emphasizes the proportions of this tooth M - distally and L -lingually

Ll dimension is > Md dm

The tip of the cusp is : Labial to the centre of the crown L - lingually,

Mesial to the centre mesiodistally

Ridge of the middle labial lobe is very noticeable labially from this aspect

Cingulum makes up the cervical third of the crown lingually

Mesially , crown width narrower than distal half , but bulk of crown is

present mesially

Distal side appears more stretched to make contact with the premolar


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Incisal aspect


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Mandibular canine

Bear close resemblance to maxillary canine

Narrower mesiodistally than that of maxillary canine

Longer than maxillary canine by 0.5-1mm

Root somewhat shorter or may be as long

Labiolingual diameter of crown and root is a fraction of a mm less

Cusp - not as well developed as that of the maxillary canine

Cusp ridges are thinner labiolingually

Variation in the form

bifurcated roots


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ADA / Universal - 2 7 , 2 2

FDI - 4 3 , 3 3

ZsigmondyPalmar

3 3

First evidence of Calcification 4 - 5 months

Enamel Completion 6 - 7 yrs

Eruption 9 - 10 yrs

Root completion 12 - 14 yrs


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Dimensions : in mm

Crown Length 11 . 0

Root length 16 . 0

M-d dm 7 . 0

M-d (At cervix) 5 . 5

L-l dm 7 . 5

L-l (At cervix) -- 7. 0

Curvature of cervical line mesially 2 . 5

Curvature of cervical line distally 1 . 0


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Labial Aspect

Crown appearslonger than that of the max canine (because of the

narrowness of the crown & the height of the cont. areas above the

cervix)

M -d dm is less than that of the max. canine, More than that of the

Incisors

Mesial outline is nearly straight with mesial outline of root .

MCA near mesio-incisal angle

Mesial cusp ridge is shorter.

When not worn out, cusp angle is in line with center of the root


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DCA is more towards the incisal aspect than that of the max.

canine but is more cervically placed, in r.t MCA

Cervical line - convex with convexity directed apically.

Root apex is curved mesially

Root is shorter than the max canine but apex is more pointed

Root curvature infrequent , if presentit is mesially directed.


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Labial Aspect


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Lingual Aspect

Lingual surface is flatter

Similar to that of the mand. incisors

Cingulum is smooth & poorly developed

Marginal ridges are less distinct

Lingual portion is narrower than that of the max. canine

Narrows to ~ >half the width of the labial surface


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Lingual Aspect


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Mesial Aspect

Labially curvature is very less, with very little curvature above the cervical line

( < 0.5 mm)

Lingual outline is similar to the max. canine ( CxCvCx )

Cingulum is not so pronounced

Incisal portion is thinner L-lingually so cusp appears sharper , cusp ridge is

more slender

Tip of cusp is more nearly centered over the root , at times a little lingually

Root shows a more pointed tip

Developmental depression is more pronounced and is deeper


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Mesial Aspect


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Distal Aspect

Similar to the mesial aspect

Incisal Aspect

Outline is similar to that of the max. canine

M-d dm is less than labio-lingual dm , distal surface is more curved

Cusp tip , mesial & distalcusp ridges are inclined more lingually than

the max. canine,

Of the mesial & distal sides , the distal cusp ridge and contact area

are more so.


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Distal Aspect


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Incisal Aspect


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TH NK YOU

Maxillary & Mandibular Canines

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